U.S. patent application number 14/006019 was filed with the patent office on 2014-01-16 for steam generator.
This patent application is currently assigned to MITSUBISHI HEAVY INDUSTRIES, LTD.. The applicant listed for this patent is Kazuo Hirota, Yoichi Iwamoto, Ryoichi Kawakami, Masatsugu Monde, Itaru Muroya, Tomoya Nakagawa, Ryuichi Umehara. Invention is credited to Kazuo Hirota, Yoichi Iwamoto, Ryoichi Kawakami, Masatsugu Monde, Itaru Muroya, Tomoya Nakagawa, Ryuichi Umehara.
Application Number | 20140014295 14/006019 |
Document ID | / |
Family ID | 47424015 |
Filed Date | 2014-01-16 |
United States Patent
Application |
20140014295 |
Kind Code |
A1 |
Umehara; Ryuichi ; et
al. |
January 16, 2014 |
STEAM GENERATOR
Abstract
A steam generator includes: an annular member (21) that
surrounds a U-bent portion (18) obtained by collectively disposing
bent portions of a plurality of heat transfer tubes and is provided
between an outer peripheral portion of the U-bent portion (18) and
a tube bundle shroud (3) surrounding the outer peripheral portion
so as to have a predetermined gap with respect to the U-bent
portion (18); a second support member (22) that is provided between
the annular member (21) and the tube bundle shroud (3); and a third
support member (23) that is attached to a cylinder portion (2)
accommodating a plurality of heat transfer tubes and supports the
second support member (22).
Inventors: |
Umehara; Ryuichi; (Tokyo,
JP) ; Monde; Masatsugu; (Tokyo, JP) ;
Kawakami; Ryoichi; (Tokyo, JP) ; Nakagawa;
Tomoya; (Tokyo, JP) ; Hirota; Kazuo; (Tokyo,
JP) ; Iwamoto; Yoichi; (Tokyo, JP) ; Muroya;
Itaru; (Tokyo, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Umehara; Ryuichi
Monde; Masatsugu
Kawakami; Ryoichi
Nakagawa; Tomoya
Hirota; Kazuo
Iwamoto; Yoichi
Muroya; Itaru |
Tokyo
Tokyo
Tokyo
Tokyo
Tokyo
Tokyo
Tokyo |
|
JP
JP
JP
JP
JP
JP
JP |
|
|
Assignee: |
MITSUBISHI HEAVY INDUSTRIES,
LTD.
Tokyo
JP
|
Family ID: |
47424015 |
Appl. No.: |
14/006019 |
Filed: |
June 21, 2012 |
PCT Filed: |
June 21, 2012 |
PCT NO: |
PCT/JP2012/065862 |
371 Date: |
September 18, 2013 |
Current U.S.
Class: |
165/69 ; 122/510;
165/178 |
Current CPC
Class: |
F22B 1/025 20130101;
F28D 2021/0064 20130101; F28D 7/1638 20130101; F28F 2265/30
20130101; F28F 2225/04 20130101; F28F 9/013 20130101; F22B 37/206
20130101; F28F 2265/00 20130101; F28D 1/0475 20130101; F28D
2021/0054 20130101 |
Class at
Publication: |
165/69 ; 122/510;
165/178 |
International
Class: |
F22B 37/20 20060101
F22B037/20; F28D 1/047 20060101 F28D001/047 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 28, 2011 |
JP |
2011-143554 |
Nov 18, 2011 |
JP |
2011-253188 |
Dec 12, 2011 |
JP |
2011-271083 |
Claims
1. A steam generator comprising: a first support member that
surrounds a U-bent portion obtained by collectively disposing bent
portions of a plurality of heat transfer tubes and is provided
between the U-bent portion and a tube bundle shroud surrounding an
outer peripheral portion of the U-bent portion so as to have a
predetermined gap with respect to the U-bent portion; a second
support member that is provided between the first support member
and the tube bundle shroud; and a third support member that is
attached to a cylinder portion accommodating the plurality of heat
transfer tubes and supports the second support member.
2. The steam generator according to claim 1, wherein the first
support member includes a regulation member that sandwiches a
bridge, connecting a plurality of holding members connecting ends
of a plurality of vibration preventing members disposed between the
heat transfer tubes in the portion, with a predetermined gap
therebetween so as to regulate a movement of the bridge.
3. The steam generator according to claim 2, wherein the regulation
member includes an orifice that is formed at a portion facing the
bridge.
4. The steam generator according to claim 1, wherein a plurality of
the second support members extend radially from the first support
member toward the tube bundle shroud and are fixed to the tube
bundle shroud, and a plurality of the third support members extend
radially from the tube bundle shroud and connect the tube bundle
shroud and the cylinder portion to each other.
5. The steam generator according to claim 1, wherein a plurality of
the first support members are disposed toward a top portion of the
U-bent portion.
6. The steam generator according to claim 5, wherein the plurality
of second support members overlap each other and the plurality of
second members overlap each other between the plurality of the
plurality of first support members when viewed from a direction in
which the plurality of first support members are arranged.
7. A steam generator with a U-bent portion obtained by collectively
disposing circular-arc portions of upper ends of a plurality of
inverse U-shaped heat transfer tubes, the steam generator
comprising: partition plates that are inserted between the heat
transfer tubes of the U-bent portion so as to divide the U-bent
portion into a plurality of portions and are supported by a support
portion to a cylinder portion accommodating the heat transfer tubes
of the steam generator.
8. The steam generator according to claim 7, wherein the partition
plates are provided at a plurality of positions.
9. The steam generator according to claim 7, wherein the partition
plates are provided so as to overlap each other.
10. The steam generator according to claim 7, wherein the partition
plates are provided with a penetration hole.
11. The steam generator according to claim 10, wherein the
penetration hole is formed as an orifice.
12. The steam generator according to claim 7, wherein the support
portion is a tube support plate that is supported to the cylinder
portion so as to fix the heat transfer tubes.
13. The steam generator according to claim 7, wherein the support
portion includes an annular portion that surrounds the U-bent
portion at the inside of a tube bundle shroud surrounding an outer
peripheral portion of the U-bent portion, a tube bundle shroud
inner member that is interposed between the tube bundle shroud and
the annular portion at the inside of the tube bundle shroud and
supports the annular portion, and a tube bundle shroud outer member
that is interposed between the tube bundle shroud and the cylinder
portion at the outside of the tube bundle shroud and supports the
tube bundle shroud inner member, and the partition plate is
supported by the annular portion.
14. The steam generator according to claim 7, wherein the support
portion includes a tube bundle shroud outer member that is
interposed between the tube bundle shroud and the cylinder portion
at the outside of a tube bundle shroud surrounding an outer
peripheral portion of the U-bent portion, and an end of the
partition plate extending to the tube bundle shroud is supported by
the tube bundle shroud outer member.
15. The steam generator according to claim 7, wherein the support
portion includes a tube bundle shroud inner member that is provided
at the inside of a tube bundle shroud surrounding an outer
peripheral portion of the U-bent portion and a tube bundle shroud
outer member that is interposed between the tube bundle shroud and
the cylinder portion at the outside of the tube bundle shroud and
supports the tube bundle shroud inner member, and the partition
plate is supported so as to be sandwiched between the plurality of
tube bundle Shroud inner members.
16. The steam generator according to claim 7, wherein a bonding
mechanism is provided between the support portion and the partition
plate or between members of the support portion so as to bond them
to each other with a predetermined gap therebetween.
17. The steam generator according to claim 7, Wherein a damping
mechanism is provided between the support portion and the partition
plate or between members of the support portion so as to connect
them to each other and damps a relative movement therebetween while
allowing the movement.
18. A steam generator comprising: a U-bent portion in which a
plurality of bent portions of a plurality of heat transfer tubes
are formed in a U-shape so as to form a semi-spherical shape on the
whole and are disposed in the out-of-plane direction perpendicular
to a plane including the bent portions; a tube bundle shroud that
surrounds the U-bent portions at the outer peripheral side thereof
and a beam member that is disposed near a top portion of the U-bent
portion so as to have a gap with respect to the U-bent portion and
has both ends fixed to an inner peripheral surface of the tube
bundle shroud so that the beam member extends in the out-of-plane
direction along a semi-spherical surface of the U-bent portion.
19. The steam generator according to claim 18, further comprising:
a movement regulation portion that regulates a relative movement of
the U-bent portion with respect to the beam member in the
out-of-plane direction.
20. The steam generator according to claim 19, wherein the movement
regulation portion includes a plurality of vibration preventing
members that are disposed between the adjacent heat transfer tubes
in the out-of-plane direction so as to connect the adjacent heat
transfer tubes to each other and has an end protruding from the
semi-spherical surface, a bridge that connects ends of the
plurality of vibration preventing member to each other in the
extension direction of the bent portion, and a regulation member
that is provided in the beam member and sandwiches the bridge with
a predetermined gap therebetween in the out-of-plane direction.
21. The steam generator according to claim 18, further comprising:
a cylinder portion that is provided at the outer peripheral side of
the tube bundle shroud and accommodates the tube bundle shroud and
the plurality of heat transfer tubes; and an outer tube support
member that is disposed throughout an inner peripheral surface of
the cylinder portion and an outer peripheral surface of the tube
bundle shroud and supports the tube bundle shroud.
22. The steam generator according to claim 18, wherein a plurality
of the beam members are provided with a gap therebetween in the
extension direction of the bent portion.
23. The steam generator according to claim 18, wherein each beam
member is obtained by connecting a plurality of divided beams in
the out-of-plane direction.
24. The steam generator according to claim 18, wherein the beam
member forms a truss structure.
Description
FIELD
[0001] The present invention relates to a steam generator with a
U-bent portion obtained by collectively disposing bent portions of
a plurality of heat transfer tubes.
BACKGROUND
[0002] A steam generator includes a U-bent portion in which a
plurality of heat transfer tubes with U-shaped bent portions are
collectively disposed so as to form a semi-spherical shape on the
whole. There is known a structure which improves the resistance
(quake resistance) of the U-bent portion with respect to an
earthquake. For example, Patent Literature 1 discloses a structure
in which a support member fixes a member that holds a plurality of
heat transfer tubes of a U-bent portion. Further, Patent Literature
2 discloses a structure in which heat transfer tubes of a U-bent
portion are fixed to a container (cylinder portion) of a steam
generator through a support member.
CITATION LIST
Patent Literature
[0003] Patent Literature 1: U.S. Pat. No. 6,772,832 [0004] Patent
Literature 2: U.S. Pat. No. 5,692,557
SUMMARY
Technical Problem
[0005] The technique of Patent Literature 1 has a structure in
which the support member fixes the member that holds the plurality
of heat transfer tubes of the U-bent portion. However, since the
support member is not fixed to the container of the steam
generator, there is a concern that the quake resistance of the
U-bent portion may not be sufficiently ensured. The technique of
Patent Literature 2 has a structure in which the heat transfer
tubes are fixed to the container of the steam generator through the
support member. However, when a restraining force of the U-bent
portion is large, there is a concern that the resistance with
respect to flow oscillation may be influenced.
[0006] Here, when an earthquake acceleration generated in the event
of an earthquake is applied in the in-plane direction of the heat
transfer tube, that is, the direction following a plane including
the bent portion of the heat transfer tube, the U-bent portion may
withstand the earthquake acceleration by the rigidity of the heat
transfer tube. Meanwhile, when the earthquake acceleration is
applied in the out-of-plane direction of the heat transfer tube,
that is, the direction perpendicular to the plane including the
bent portion of the heat transfer tube, there is a problem in which
the U-bent portion is largely displaced due to the to rigidity of
the heat transfer tube in the direction. Further, in the techniques
of Patent Literatures 1 and 2, the support member immovably fixes
the U-bent portion. For this reason, the restraining force of the
U-bent portion excessively increases, and hence there is a concern
that the resistance with respect to the flow oscillation may be
influenced.
[0007] It is an object of the invention to ensure the quake
resistance and the resistance with respect to the flow oscillation
in the U-bent portion.
Solution to Problem
[0008] According to an aspect of the present invention, a steam
generator includes: a first support member that surrounds a U-bent
portion obtained by collectively disposing bent portions of a
plurality of heat transfer tubes and is provided between the U-bent
portion and a tube bundle shroud surrounding an outer peripheral
portion of the U-bent portion so as to have a predetermined gap
with respect to the U-bent portion; a second support member that is
provided between the first support member and the tube bundle
shroud; and a third support member that is attached to a cylinder
portion accommodating the plurality of heat transfer tubes and
supports the second support member.
[0009] In the steam generator, when the U-bent portion is vibrated
in a direction parallel to the radial direction of the cylinder
portion having a circular cross-section due to an earthquake or the
like, the vibration of the U-bent portion may be received by the
cylinder portion through the first support member, the second
support member, and the third support member, and hence the quake
resistance of the U-bent portion is ensured. Further, since the
first support member is disposed with a predetermined gap with
respect to the U-bent portion, the restraining force of the U-bent
portion may be reduced. For this reason, since the vibration
abrasion or the like of the heat transfer tube caused by secondary
cooling water passing between the first support member and the
U-bent portion may be suppressed during the operation of the steam
generator, the above-described resistance may be ensured by
reducing an influence on the resistance with respect to the flow
oscillation of the heat transfer tube.
[0010] Advantageously, in the steam generator, the first support
member includes a regulation member that sandwiches a bridge,
connecting a plurality of holding members connecting ends of a
plurality of vibration preventing members disposed between the heat
transfer tubes in the U-bent portion, with a predetermined gap
therebetween so as to regulate a movement of the bridge. The
regulation member attached to the first support member does not
restrain the heat transfer tube which is supported by the bridge
through the vibration preventing member and the holding member in
the U-bent portion. For this reason, since the vibration abrasion
or the like of the bridge caused by the secondary cooling water
passing through a gap formed between the regulation member and the
U-bent portion may be suppressed during the operation of the steam
generator, the above-described resistance may be suppressed by
reducing an influence on the resistance with respect to the flow
oscillation of the heat transfer tube. Further, when the U-bent
portion and the bridge are vibrated by an earthquake or the like,
the regulation member which is supported by the cylinder portion
through the first support member, the second support member, and
the third support member regulates the vibration of the bridge.
Since the gap between the regulation member and the bridge is
smaller than the gap between the first support member and each of
the plurality of heat transfer tubes of the U-bent portion, the
vibration of the U-bent portion may be further effectively
suppressed. As a result, it is possible to further reliably ensure
the quake resistance of the U-bent portion by using the regulation
member.
[0011] According to a third aspect of the invention, in the second
invention, the regulation member may have an orifice that is formed
at a portion facing the bridge. In this way, since it is possible
to obtain a damping action that damps the vibration of the bridge,
it is possible to alleviate an abrupt change in the acceleration
acting on the plurality of heat transfer tubes of the U-bent
portion, and hence to further improve the quake resistance of the
U-bent portion.
[0012] Advantageously, in the steam generator, a plurality of the
second support members extend radially from the first support
member toward the tube bundle shroud and are fixed to the tube
bundle shroud, and a plurality of the third support members extend
radially from the tube bundle shroud and connect the tube bundle
shroud and the cylinder portion to each other. In this way, the
first support member is supported by the cylinder portion of the
steam generator through the second support member and the third
support member, and the tube bundle shroud is supported to the
cylinder portion by the third support member. Further, since the
tube bundle shroud is reinforced by the first support member and
the second support member, the strength is improved. As a result,
since the heat transfer tube of the U-bent portion vibrated by an
earthquake is supported through the first support member, the
second support member, the tube bundle shroud, and the third
support member, the quake resistance of the U-bent portion is
improved.
[0013] According to a fifth aspect of the invention, in the first
to the forth aspects of the invention, a plurality of the first
support members may be disposed in an overlapping manner toward the
top portion of the U-bent portion. In this way, the quake
resistance may be improved by further reliably suppressing the
vibration of the U-bent portion.
[0014] Advantageously, in the steam generator, the plurality of
second support members overlap each other and the plurality of
second members overlap each other between the plurality of the
plurality of first support members when viewed from a direction in
which the plurality of first support members are arranged. In this
way, it is possible to suppress the disturbance of the flow of the
secondary cooling water from the tube support plate toward the top
portion of the U-bent portion.
[0015] According to another aspect of the present invention, a
steam generator with a U-bent portion obtained by collectively
disposing circular-arc portions of upper ends of a plurality of
inverse U-shaped heat transfer tubes, includes: partition plates
that are inserted between the heat transfer tubes of the U-bent
portion so as to divide the U-bent portion into a plurality of
portions and are supported by a support portion to a cylinder
portion accommodating the heat transfer tubes of the steam
generator.
[0016] According to the steam generator, since the deformation of
the heat transfer tube inside the U-bent portion is suppressed by
the partition plate, the quake resistance of the U-bent portion may
be ensured by decreasing the stress applied to the U-bent portion
with respect to the excessive excitation force to the allowable
stress or less.
[0017] Advantageously, in the steam generator, the partition plates
are provided at a plurality of positions.
[0018] When an oscillation is transmitted to the steam generator
due to an earthquake or the like, a large excitation force is
applied to the U-bent portion at the upper end side of the heat
transfer tube. For this reason, according to the steam generator of
the invention, since the deformation of the heat transfer tube is
suppressed at a plurality of positions inside the U-bent portion by
the partition plate, the quake resistance of the U-bent portion may
be further ensured by decreasing the stress applied to the U-bent
portion with respect to the excessive excitation force to the
allowable stress or less.
[0019] Advantageously, in the steam generator, the partition plates
are provided so as to overlap each other.
[0020] According to the steam generator, since the deformation of
the heat transfer tube inside the U-bent portion is suppressed by
the plurality of partition plates overlapping one another to
improve the rigidity thereof, the quake resistance of the U-bent
portion may be further ensured by decreasing the stress applied to
the U-bent portion with respect to the excessive excitation force
to the allowable stress or less.
[0021] Advantageously, in the steam generator, the partition plates
are provided with a penetration hole.
[0022] According to the steam generator, it is possible to ensure
the quake resistance of the U-bent portion by the partition plates
and to ensure the flowability of the secondary cooling water by the
penetration hole. Thus, it is possible to ensure the steam
generation efficiency.
[0023] Advantageously, in the steam generator, the penetration hole
is formed as an orifice.
[0024] According to the steam generator, it is possible to ensure
the steam generation efficiency by ensuring the flowability of the
secondary cooling water by an orifice. Then, when the partition
plate is vibrated due to an earthquake, the vibration may be
damped.
[0025] Advantageously, in the steam generator, the support portion
is a tube support plate that is supported to the cylinder portion
so as to fix the heat transfer tubes.
[0026] According to the steam generator, since the support portion
supports the partition plate, the partition plate may be supported
to the cylinder portion by being inserted between the heat transfer
tubes of the U-bent portion.
[0027] Advantageously, in the steam generator, the support portion
includes an annular portion that surrounds the U-bent portion at
the inside of a tube bundle shroud surrounding an outer peripheral
portion of the U-bent portion, a tube bundle shroud inner member
that is interposed between the tube bundle shroud and the annular
portion at the inside of the tube bundle shroud and supports the
annular portion, and a tube bundle shroud outer member that is
interposed between the tube bundle shroud and the cylinder portion
at the outside of the tube bundle shroud and supports the tube
bundle shroud inner member, and the partition plate is supported by
the annular portion.
[0028] According to the steam generator, since the support portion
supports the partition plate, the partition plate may be supported
to the cylinder portion by being inserted between the heat transfer
tubes of the U-bent portion.
[0029] Advantageously, in the steam generator, the support portion
includes a tube bundle shroud outer member that is interposed
between the tube bundle shroud and the cylinder portion at the
outside of a tube bundle shroud surrounding an outer peripheral
portion of the U-bent portion, and an end of the partition plate
extending to the tube bundle shroud is supported by the tube bundle
shroud outer member.
[0030] According to the steam generator, since the support portion
supports the partition plate, the partition plate may be supported
to the cylinder portion by being inserted between the heat transfer
tubes of the U-bent portion.
[0031] Advantageously, in the steam generator, the support portion
includes a tube bundle shroud inner member that is provided at the
inside of a tube bundle shroud surrounding an outer peripheral
portion of the U-bent portion and a tube bundle shroud outer member
that is interposed between the tube, bundle shroud and the cylinder
portion at the outside of the tube bundle shroud and supports the
tube bundle shroud inner member, and the partition plate is
supported so as to be sandwiched between the plurality of tube
bundle shroud inner members.
[0032] According to the steam generator, since the support portion
supports the partition plate, the partition plate may be supported
to the cylinder portion by being inserted between the heat transfer
tubes of the U-bent portion.
[0033] Advantageously, in the steam generator, a bonding mechanism
is provided between the support portion and the partition plate or
between members of the support portion so as to bond them to each
other with a predetermined gap therebetween.
[0034] According to the steam generator, since the bonding
mechanism is provided between the support portion and the partition
plate or between the members of the support portion so as to bond
them to each other with a predetermined gap therebetween, the
members are not strongly fixed to each other. For this reason, it
is possible to prevent the vibration generated during the general
operation of the steam generator from being transmitted to the
cylinder portion or the partition plate.
[0035] Advantageously, in the steam generator, a damping mechanism
is provided between the support portion and the partition plate or
between members of the support portion so as to connect them to
each other and damps a relative movement therebetween while
allowing the movement.
[0036] According to the steam generator, since the damping
mechanism is provided between the support portion and the partition
plate or between the members of the support portion so as to damp
the oscillation generated therebetween, the quake resistance of the
U-bent portion may be further ensured.
[0037] According to still another aspect or the present invention,
a steam generator includes: a U-bent portion in which a plurality
of bent portions of a plurality of heat transfer tubes are formed
in a U-shape so as to form a semi-spherical shape on the whole and
are disposed in the out-of-plane direction perpendicular to a plane
including the bent portions; a tube bundle shroud that surrounds
the U-bent portions at the outer peripheral side thereof; and a
beam member that is disposed near a top portion of the U-bent
portion so as to have a gap with respect to the U-bent portion and
has both ends fixed to an inner peripheral surface of the tube
bundle shroud so that the beam member extends in the out-of-plane
direction along a semi-spherical surface of the U-bent portion.
[0038] According to the characteristic steam generator, when the
earthquake acceleration is applied to the U-bent portion in the
out-of-plane direction so that the U-bent portion is vibrated, the
vibration of the U-bent portion in the out-of-plane direction may
be received by the beam member that extends along the
semi-spherical surface of the U-bent portion in the out-of-plane
direction. Further, since the beam member is disposed with a gap
with respect to the U-bent portion, the restraining force of the
U-bent portion may be reduced. For this reason, when the steam
generator is operated, the vibration abrasion or the like of the
heat transfer tube or the like caused by the secondary cooling
water passing between the beam member and the U-bent portion is
suppressed.
[0039] Advantageously, the steam generator further includes a
movement regulation portion that regulates a relative movement of
the U-bent portion with respect to the beam member in the
out-of-plane direction.
[0040] Accordingly, since the vibration of the U-bent portion is
reliably suppressed by the beam member in the event of an
earthquake, the restraining force of the U-bent portion may be
reduced during the operation of the steam generator.
[0041] Advantageously, in the steam generator, the movement
regulation portion includes a plurality of vibration preventing
members that are disposed between the adjacent heat transfer tubes
in the out-of-plane direction so as to connect the adjacent heat
transfer tubes to each other and has an end protruding from the
semi-spherical surface, a bridge that connects ends of the
plurality of vibration preventing member to each other in the
extension direction of the bent portion, and a regulation member
that is provided in the beam member and sandwiches the bridge with
a predetermined gap therebetween in the out-of-plane direction.
[0042] The regulation member attached to the beam member does not
restrain the heat transfer tube that is supported by the bridge
through the vibration preventing member. For this reason, it is
possible to suppress the vibration abrasion or the like of the
bridge caused by the secondary cooling water passing through the
gap formed between the regulation member and the U-bent portion
during the operation of the steam generator. Thus, it is possible
to reduce an influence on the resistance of the heat transfer tube
with respect to the flow oscillation and hence to suppress
degradation in the resistance. Meanwhile, when the U-bent portion,
the vibration preventing member, and the bridge are vibrated
together due to an earthquake or the like, the regulation member
regulates the vibration of the bridge in the out-of-plane
direction. Accordingly, it is possible to suppress the vibration of
the heat transfer tube connected to the bridge through the
vibration preventing member in the out-of-plane direction.
[0043] Advantageously, the steam generator further includes: a
cylinder portion that is provided at the outer peripheral side of
the tube bundle shroud and accommodates the tube bundle shroud and
the plurality of heat transfer tubes; and an outer tube support
member that is disposed throughout an inner peripheral surface of
the cylinder portion and an outer peripheral surface of the tube
bundle shroud and supports the tube bundle shroud.
[0044] Accordingly, since the vibration of the U-bent portion in
the out-of-plane direction may be received by the cylinder portion
through the beam member, the tube bundle shroud, and the support
member, the strong quake resistance of the U-bent portion may be
further obtained.
[0045] Advantageously, in the steam generator, plurality of the
beam members are provided with a gap therebetween in the extension
direction of the bent portion.
[0046] Accordingly, it is possible to further reliably suppress the
vibration of the U-bent portion in the out-of-plane direction.
[0047] Advantageously, in the steam generator, each beam member is
obtained by connecting a plurality of divided beams in the
out-of-plane direction.
[0048] Generally, since various structures are provided near the
top portion of the U-bent portion in the steam generator, it is
difficult to carry and install the single beam member to the
installation position. On the contrary, since the beam member
includes the plurality of divided beams, the respective divided
beams may be easily carried to the installation position of the
beam member. Accordingly, the beam members may be easily installed
by connecting the divided beams at the installation position of the
beam member.
[0049] Advantageously, in the steam generator, the beam member
forms a truss structure.
[0050] Accordingly, since it is possible to reduce the
cross-sectional area perpendicular to the extension direction of
the beam member while ensuring the rigidity of the beam member, it
is possible to reduce the fluid resistance of the secondary cooling
water. Thus, it is possible to obtain a function of suppressing the
vibration of the U-bent portion in the out-of-plane direction by
the beam member without degrading the performance of the steam
generator.
Advantageous Effects of Invention
[0051] The invention may ensure the quake resistance and the
resistance with respect to the flow oscillation of the U-bent
portion. Further, in the invention, since the vibration of the
U-bent portion in the out-of-plane direction may be received by the
beam member extending along the semi-spherical surface of the
U-bent portion in the out-of-plane direction, the quake resistance
of the U-bent portion in the out-of-plane direction may be ensured.
Further, since the beam member is disposed with a gap with respect
to the U-bent portion, it is possible to suppress the vibration
abrasion or the like of the heat transfer tube or the like caused
by the secondary cooling water passing between the beam member and
the U-bent portion and hence to ensure the resistance with respect
to the flow oscillation.
BRIEF DESCRIPTION OF DRAWINGS
[0052] FIG. 1 is a schematic diagram illustrating a steam generator
according to an embodiment.
[0053] FIG. 2 is a diagram illustrating a bent portion of a heat
transfer tube.
[0054] FIG. 3 is a plan view illustrating a. U-bent portion.
[0055] FIG. 4 is a cross-sectional view taken along the line A-A of
FIG. 3.
[0056] FIG. 5 is a perspective view illustrating the U-bent
portion.
[0057] FIG. 6 is a perspective view illustrating a quake-resistant
structure of a steam generator according to a first embodiment.
[0058] FIG. 7 is a plan view illustrating the quake-resistant
structure of the steam generator according to the first
embodiment.
[0059] FIG. 8 is an enlarged view illustrating a part of the
quake-resistant structure of the steam generator according to the
first embodiment.
[0060] FIG. 9 is a diagram illustrating a relation between a
regulation member and a bridge of the quake-resistant structure of
the steam generator according to the first embodiment.
[0061] FIG. 10 is a plan view illustrating a quake-resistant
structure according to a modified example of the first
embodiment.
[0062] FIG. 11 is a diagram illustrating a modified example of the
regulation member of the first embodiment.
[0063] FIG. 12 is a diagram illustrating a modified example of the
regulation member of the first embodiment.
[0064] FIG. 13 is a diagram illustrating a modified example of the
regulation member of the first embodiment.
[0065] FIG. 14 is a diagram illustrating a modified example of the
regulation member of the first embodiment.
[0066] FIG. 15 is a side view illustrating a partition plate of a
steam generator according to a second embodiment.
[0067] FIG. 16 is a cross-sectional view taken along the line B-B
of FIG. 15.
[0068] FIG. 17 is a side view illustrating another embodiment of
the partition plate of the steam generator according to the second
embodiment.
[0069] FIG. 18 is a side view illustrating another embodiment of
the partition plate of the steam generator of the second
embodiment.
[0070] FIG. 19 is a cross-sectional view illustrating the partition
plate of the steam generator according to the second
embodiment.
[0071] FIG. 20 is a cross-sectional view illustrating the partition
plate of the steam generator according to the second
embodiment.
[0072] FIG. 21 is a side view illustrating a support portion of the
steam generator according to the second embodiment.
[0073] FIG. 22 is a perspective view illustrating the support
portion of the steam generator according to the second
embodiment.
[0074] FIG. 23 is a plan view illustrating the support portion of
the steam generator according to the second embodiment.
[0075] FIG. 24 is a side view illustrating another embodiment of
the support portion of the steam generator according to the second
embodiment.
[0076] FIG. 25 is a side view illustrating another embodiment of
the support portion of the steam generator according to the second
embodiment.
[0077] FIG. 26 is a schematic diagram illustrating a bonding
mechanism of the steam generator according to the second
embodiment.
[0078] FIG. 27 is a schematic diagram illustrating a damping
mechanism of the steam generator according to the second
embodiment.
[0079] FIG. 28 is a schematic diagram illustrating another
embodiment of the damping mechanism of the steam generator
according to the second embodiment.
[0080] FIG. 29 is a perspective view illustrating a U-bent portion
of a steam generator according to a third embodiment.
[0081] FIG. 30 is a longitudinal sectional view illustrating a
relation of a vibration preventing member, a holding member, and a
bridge of the steam generator according to the third embodiment in
the out-of-plane direction.
[0082] FIG. 31 is a plan view illustrating a quake-resistant
structure of the steam generator according to the third
embodiment.
[0083] FIG. 32 is a longitudinal sectional view of the
quake-resistant structure of the steam generator according to the
third embodiment.
[0084] FIG. 33 is a longitudinal sectional view illustrating a
relation of a bridge and a regulation member of the quake-resistant
structure of the steam generator according to the third embodiment
in the out-of-plane direction.
[0085] FIG. 34 is a longitudinal sectional view illustrating
another embodiment of the quake-resistant structure of the steam
generator according to the third embodiment.
[0086] FIG. 35 is a cross-sectional view illustrating a connection
position of divided beams of the embodiment illustrated in FIG.
34.
[0087] FIG. 36 is a cross-sectional view illustrating a connection
position of the divided beams of the embodiment illustrated in FIG.
34.
[0088] FIG. 37 is a longitudinal sectional view illustrating
another embodiment of the quake-resistant structure of the steam
generator according to the third embodiment.
DESCRIPTION OF EMBODIMENTS
[0089] Modes (embodiments) for carrying out the invention will be
described in detail by referring to the drawings. The present
invention is not limited to the description of the embodiments
below. Further, the components described below include a component
which may be easily supposed by the person skilled in the art and a
component which has substantially the same configuration.
Furthermore, the configurations described below may be
appropriately combined with one another. Further, various
omissions, replacements, or modifications of the components may be
made without departing from the spirit of the invention. In this
embodiment, the down direction indicates the vertical direction
(gravity acting direction), and the up direction indicates the
opposite side in the vertical direction.
[0090] FIG. 1 is a schematic diagram illustrating a steam generator
according to the embodiment. FIG. 2 is a diagram illustrating a
bent portion of a heat transfer tube. A steam generator 1 is used
in, for example, a pressurized water reactor (PWR). The pressurized
water reactor uses light water as reactor coolant and neutron
moderator. The pressurized water reactor uses light water as
primary coolant. The pressurized water reactor sends primary
coolant (primary cooling water) as hot and pressurized water which
is not boiled throughout a reactor core to the steam generator 1.
In the steam generator 1, the heat of the hot and pressurized
primary cooling water is transmitted to secondary coolant
(secondary cooling water) so as to change secondary cooling water
into steam. The steam is sent to a steam turbine so as to drive the
steam turbine. Since an input shaft of a power generator is
connected to an output shaft of the steam turbine, the power
generator which is driven by the steam turbine generates power.
[0091] The steam generator 1 includes a cylinder portion 2. The
cylinder portion 2 has a hermetic hollow cylindrical shape
extending in the up and down direction, and is formed as a
structure of which the diameter of a lower half portion is smaller
than that of an upper half portion. In the cylinder portion 2, a
channel head 7 is disposed near one end of the cylinder portion and
a steam discharge port 12 is disposed near the other end thereof.
The steam generator 1 is provided so that the channel head 7 faces
the downside and the steam discharge port 12 faces the upside.
[0092] A cylindrical tube bundle shroud (wrapper tube) 3 which is
disposed with a predetermined gap with respect to the inner wall
surface of the cylinder portion 2 is provided from the inside of
the lower half portion of the cylinder portion 2 to the upper half
portion thereof. The lower end of the tube bundle shroud 3 extends
to a tube sheet 4 which is disposed at the lower position inside
the lower half portion of the cylinder portion 2. The inside of the
tube bundle shroud 3 is provided with a heat transfer tube group 51
having a plurality of heat transfer tubes 5 with U-shaped bent
portions 5U illustrated in FIG. 2. Then, the tube bundle shroud 3
and the plurality of heat transfer tubes 5 are accommodated by the
cylinder portion 2 provided at the outer peripheral side of the
tube bundle shroud 3. The respective heat transfer tubes 5 are
arranged so that the U-shaped portions of the bent portions face to
upside, that is, the steam discharge port 12, the ends facing the
downside, that is, the channel head 7 are supported by the tube
sheet 4, and the intermediate portions thereof are supported by a
plurality of tube support plates 6. The assembled portion of the
U-shaped bent portions of the plurality of heat transfer tubes 5 is
a U-bent portion 18. The U-bent portion 18 is disposed near the
upside of the heat transfer tube group 51, that is, the steam
discharge port 12. The tube support plate 6 is provided with a
plurality of penetration holes, and the respective heat transfer
tubes 5 pass through the penetration holes in a non-contact
state.
[0093] The lower end of the cylinder portion 2 is provided with the
channel head 7. The inside of the channel head 7 is divided by a
partition wall 8 into an inlet chamber 71 and an outlet chamber 72.
One ends of the respective heat transfer tubes 5 communicate with
the inlet chamber 71 and the other ends of the respective heat
transfer tubes 5 communicate with the outlet chamber 72. Further,
the inlet chamber 71 is provided with an inlet nozzle 711 which
communicates with the outside of the cylinder portion 2, and the
outlet chamber 72 is provided with an outlet nozzle 721 which
communicates with the outside of the cylinder portion 2. Then, the
inlet nozzle 711 is connected with a cooling water tube through
which the primary cooling water is sent from the pressurized water
reactor. The outlet nozzle 721 is connected with a cooling water
tube through which the primary cooling water subjected to the heat
exchange process is sent to the pressurized water reactor.
[0094] The upper half portion of the cylinder portion 2 is provided
with a steam-water separator 9 which separates fed water W into
steam S and hot water and a moisture separator 10 which removes
moisture of the separated steam S so that the steam substantially
becomes dry steam. A water feeding tube 11 which feeds the
secondary cooling water from the outside into the cylinder portion
2 is inserted between the steam-water separator 9 and the heat
transfer tube group 51. Further, the upper end of the cylinder
portion 2 is provided with the steam discharge port 12. Further,
the inside of the lower half portion of the cylinder portion 2 is
provided with a water feeding line 13 which causes the secondary
cooling water fed from the water feeding tube 11 into the cylinder
portion 2 to flow down between the cylinder portion 2 and the tube
bundle shroud 3, to be turned back by the tube sheet 4, and to rise
along the heat transfer tube group 51. Furthermore, the steam
discharge port 12 is connected with a cooling water tube which
sends the steam to the turbine, and the water feeding tube 11 is
connected with a cooling water tube which is used to supply the
secondary cooling water obtained by cooling the steam used in the
turbine by the condenser.
[0095] In the steam generator 1, the primary cooling water which is
heated by the pressurized water reactor is sent to the inlet
chamber 71, circulates so as to pass through the plurality of heat
transfer tubes 5, and reaches the outlet chamber 72. Meanwhile, the
secondary cooling water which is cooled by the condenser is sent to
the water feeding tube 11, passes through the water feeding line 13
inside the cylinder portion 2, and rises along the heat transfer
tube group 51. At this time the hot and pressurized primary cooling
water and the secondary cooling water exchange heat therebetween
inside the cylinder portion 2. Then, the cooled primary cooling
water is returned from the outlet chamber 72 to the pressurized
water reactor. Meanwhile, the secondary cooling water which
exchanges heat with the hot and pressurized primary cooling water
rises inside the cylinder portion 2 and is separated by the
steam-water separator 9 into steam and hot water. Then, moisture is
removed from the separated steam by the moisture separator 10, and
the steam is sent to the turbine.
[0096] FIG. 3 is a plan view illustrating the U-bent portion, FIG.
4 is a cross-sectional view taken along the line A-A of FIG. 3, and
FIG. 5 is a perspective view illustrating the U-bent portion. In
the steam generator 1, a fluid excitation oscillation occurs in
inverse U-shaped bent portions 5U when the primary cooling water
passes through the respective heat transfer tubes 5. Therefore, the
bent portions 5U of the heat transfer tubes 5 are provided with a
vibration preventing member. The upper end of the heat transfer
tube group 51 is the U-bent portion 18. The bent portion 18 is a
portion obtained by collectively arranging the inverse U-shaped
bent portions 5U of the plurality of heat transfer tubes 5. As
illustrated in FIG. 4, heat transfer tube layers 5A are formed by
arranging the heat transfer tubes 5 from the center of the heat
transfer tube layers toward the outside (upside) so that the
curvature radius of the bent portion 5U becomes larger. Further, as
illustrated in FIG. 3, the upper end of the heat transfer tube
group 51 is formed in a semi-spherical shape by changing the
curvature radiuses of the bent portions 5U of the outermost
peripheral heat transfer tubes while laterally overlapping the
arranged heat transfer tube layers 5A. That is, the U-bent portion
18 has a semi-spherical shape, and the portion closest to the steam
discharge port 12 illustrated in FIG. 1 becomes the top portion of
the U-bent portion 18.
[0097] As illustrated in FIG. 5, the vibration preventing member 14
is inserted between the heat transfer tube layers 5A in the
out-of-plane direction D1. As illustrated in FIG. 4, the vibration
preventing member 14 is substantially bent overlapping in a V-shape
at a position deviated from the center line S of the circular-arc
portion 5U of the heat transfer tube layer 5A (in FIG. 4, the
V-shaped vibration preventing member is denoted by the sign 14A).
Further, the vibration preventing member 14 is formed in a linear
shape along the center line S at the position of the center (the
center line S illustrated in FIG. 4) of the circular-arc portion 5U
of the heat transfer tube layer 5A (in FIG. 4, the linear vibration
preventing member is denoted by the sign 14B).
[0098] The bent portion of the V-shaped vibration preventing member
14A is disposed at the uniform diameter portions of the respective
heat transfer tube layers 5A overlapping in the out-of-plane
direction. D1. Then, both ends of the vibration preventing member
14A protrude toward the outside of the circular-arc portion 5U of
the heat transfer tube 5 with the largest diameter. Further, in the
vibration preventing member 14A, a small V-shaped vibration
preventing member is disposed inside a large. V-shaped vibration
preventing member so as to make a pair, and for example, two pairs
are disposed at the semi-circular portion of the heat transfer tube
5.
[0099] The linear vibration preventing member 14B is disposed along
the center line S of the circular-arc portion 5U of the heat
transfer tube layer 5A. Then, the vibration preventing member 14B
is attached to the uppermost tube support plate 6 in the steam
generator 1 while one end of the vibration preventing member
protrudes toward the outside of the circular-arc portion 5U of the
heat transfer tube 5 having the largest diameter. Furthermore, the
vibration preventing member 14B may not be provided in accordance
with the type of the steam generator 1. In the vibration preventing
member 14 (14A, 14B), the portion which is inserted between the
respective heat transfer tube layers 5A overlapping in the
out-of-plane direction D1 is formed of a material (for example,
SUS405) which desirably suppress the vibration.
[0100] The vibration preventing members 14 (14A, 14E) are arranged
so that the ends protruding toward the outside of the circular-arc
portions 5U of the heat transfer tubes 5 are arranged in series
along the circular-arc of the semi-spherical shape in the stacking
direction (the out-of-plane direction D1) of the heat transfer tube
layers 5A. Further, the ends protruding toward the outside of the
circular-arc portions 5U of the heat transfer tubes 5 are provided
with bonding members 15. As illustrated in FIGS. 3 to 5, the
bonding members 15 which are provided in the vibration preventing
member 14 are welded at holding members 16 thereof. Each holding
member 16 is a circular-arc bar-like member which is attached along
the semi-spherical outer periphery of the heat transfer tube group
51. The plurality of holding members 16 are arranged in a direction
(the in-plane direction D2) perpendicular to a direction (the
out-of-plane direction D1) in which the plurality of heat transfer
tubes 5 overlap one another. The plurality of holding members 16
are welded to the respective bonding members 15 so as to connect
the ends of the vibration preventing members 14 (14A, 14B) arranged
in series along the circular-arc of the semi-spherical shape in the
stacking direction (the out-of-plane direction D1) of the heat
transfer tube layers 5A. Each holding member 16 is attached to the
heat transfer tube group 51 by welding both ends of a U-shaped
attachment portion 16a inserted between the outermost peripheral
heat transfer tube 5 and the heat transfer tube 5 inside the
outermost peripheral heat transfer tube. Accordingly, the vibration
preventing member 14 is attached to the heat transfer tube group 51
through the holding member 16. Further, as illustrated in FIG. 5, a
bridge 17 is welded to a part of the bonding members 15 of the
plurality of vibration preventing members 14 provided with a gap
therebetween in the out-of-Jane direction D1. More specifically,
the bonding member 15 of the vibration preventing member 14
protrudes toward the outside of the semi-spherical surface in the
radial direction in relation to the other vibration preventing
member 14, and the bridge 17 is welded to the protruding portion.
The bridge 17 is a circular-arc and plate-like member that is
disposed along the outer periphery of the U-bent portion 18, that
is, the outer periphery of the semi-spherical shape of the heat
transfer tube group 51 so as to extend in the in-plane direction
D2. The bridge 17 extends along the extension direction of the bent
portion 5U in the U-bent portion 18. In FIG. 5, one bridge 17 is
illustrated, but a plurality of bridges 17 are arranged with a gap
therebetween in the out-of-plane direction D1.
First Embodiment
[0101] FIG. 6 is a perspective view illustrating a quake-resistant
structure of a steam generator according to a first embodiment.
FIG. 7 is a plan view illustrating the quake-resistant structure of
the steam generator according to the first embodiment. FIG. 8 is an
enlarged view illustrating a part of the quake-resistant structure
of the steam generator according to the first embodiment. FIG. 9 is
a diagram illustrating a relation of a regulation member and a
bridge of the quake-resistant structure of the steam generator
according to the first embodiment. A quake-resistant structure
(hereinafter, referred to as a quake-resistant structure) 20 of the
steam generator includes an annular member 21 (21A, 21B) as a first
support member, a second support member 22 (22A, 22B), and a third
support member 23 (23A, 23B). The quake-resistant structure 20
includes two annular members 21, two second support members 22, and
two third support members 23. In the description below, when the
support members need to be distinguished from each other, the sign
A is added to the support member near the tube support plate 6, and
the sign A is added to the support member near the top portion 18T
of the U-bent portion 18. When the support members do not need to
be distinguished from each other, the signs A and B are not added
to the support members.
[0102] The annular member 21 surrounds the U-bent portion 18
obtained by collectively disposing the bent portions 5U of the
plurality of heat transfer tubes 5. Then, the annular member 21 is
provided between the outer peripheral portion of the U-bent portion
18 and the tube bundle shroud 3 surrounding the outer peripheral
portion so as to have a predetermined gap with respect to the
U-bent portion 18. The second support member 22 is provided between
the annular member 21 and the tube bundle shroud 3, and supports
the annular member 21 by the tube bundle shroud 3. The third
support member 23 is attached to the cylinder portion 2 (more
specifically, the inner peripheral surface of the cylinder portion
2) accommodating the plurality of heat transfer tubes 5, and
supports the second support member 22. Since the tube bundle shroud
3 is interposed between the second support member 22 and the third
support member 23, the third support member 23 supports the annular
member 21 by the cylinder portion 2 through the tube bundle shroud
3. The annular member 21 is a structure which has a circular shape
in a plan view. The annular member 21 may be obtained by forming a
hollow cylindrical tube in an annular shape or forming a solid
bar-like member having a circular cross-section in an annular
shape.
[0103] As illustrated in FIG. 8, the plurality of second support
members 22 are provided at the outside of the annular member 21 in
the radial direction, and extend radially from the annular member
21 toward the tube bundle shroud 3. The plurality of third support
members 23 extend in a direction parallel to the radial direction
of the cylinder portion 2 from the inner surface of the cylinder
portion 2 having a circular cross-section toward the tube bundle
shroud 3. That is, the plurality of third support members 23 extend
radially from the tube bundle shroud 3.
[0104] The end of each second support member 22 opposite to the
annular member 21 is fixed to the tube bundle shroud 3 through a
pedestal 27. The second support member 22 and the pedestal 27 are
attached to each other by, for example, welding. The pedestal 27 is
fixed to the tube bundle shroud 3 by, for example, a fastening
member such as a bolt. With such a structure, the second support
member 22 is fixed to the tube bundle shroud 3.
[0105] The pedestal 27 is attached to each of both ends of the
third support member 23. The third support member 23 and the
pedestal 27 are attached to each other by, for example, welding.
The pedestal 27 near one end of the third support member 23 is
fixed to the cylinder portion 2 by, for example, a fastening member
such as a bolt. Further, the pedestal 27 near the other end of the
third support member 23 is fixed to the tube bundle shroud by the
bolt that fixes the pedestal 27 attached to the second support
member 22 to the tube bundle shroud 3. With such a structure, the
third support member 23 connects the cylinder portion 2 and the
tube bundle shroud 3 to each other. Then, the annular member 21 is
supported by the cylinder portion 2 through the second support
member 22 and the third support member 23 in this embodiment, the
annular member 21A near the tube support plate 6 and the annular
member 21B near the top portion 18T of the U-bent portion 18 have
different diameters, but are respectively supported by the cylinder
portion 2 through the second support members 22A and 22B and the
third support members 23A and 23B.
[0106] When the U-bent portion 18 is vibrated in a direction
parallel to the radial direction of the cylinder portion 2 having a
circular cross-section by an earthquake or the like, the vibration
of the U-bent portion 18 may be received by the cylinder portion 2
through the annular member 21, the second support member 22, and
the third support member 23, and hence the quake resistance of the
U-bent portion 18 is ensured. Further, since the annular member 21
is disposed with a predetermined gap with respect to the U-bent
portion 18, the restraining force of the U-bent portion 18 may be
reduced. Furthermore, in this embodiment, since the annular member
21 does not restrain the heat transfer tubes 5 of the U-bent
portion 18, the restraining force is 0. For this reason, when the
steam generator 1 is operated, it is possible to suppress the
vibration abrasion or the like of the heat transfer tubes 5 or the
like due to the secondary cooling water that passes between the
annular member 21 and the U-bent portion 18. As a result, the
quake-resistant structure 20 which has the annular member 21 may
ensure the resistance by reducing the influence on the resistance
with respect to the flow resistance of the heat transfer tube 5.
Further, since the annular member 21, the second support member 22,
and the third support member 23 of the quake-resistant structure 20
may be attached to even the existing steam generator 1 by a
repairing work, the quake resistance of the existing steam
generator 1 may be improved.
[0107] In this embodiment, the annular member 21 of the
quake-resistant structure 20 includes regulation members 24
illustrated in FIGS. 7 and 8. As illustrated in FIGS. 8 and 9, each
regulation member 24 regulates the movement of the bridge 17 by
sandwiching the bridge 17, connecting the plurality of holding
members 15 connecting the ends of the plurality of vibration
preventing members 14 disposed between the heat transfer tubes 5 in
the U-bent portion 18, with a predetermined gap C. More
specifically, the holding member 16 regulates the movement of the
bridge 17 in a direction of overlapping the heat transfer tubes
5.
[0108] A regulation member 24A includes a groove portion 24S. The
bridge 17 is sandwiched in the groove portion 24S with a
predetermined gap C. The regulation member 24A is attached to the
annular member CIA and the regulation member 24B is attached to the
annular member 21B by a bonding method, for example, welding or the
like. Since the regulation member 24 and the bridge 17 have a
predetermined gap C (about 5 mm to 10 mm) therebetween, a gap is
formed therebetween.
[0109] With such a structure, since the regulation member 24 which
is attached to the annular member 21 does not restrain the heat
transfer tubes 5 which are supported by the bridge 17 through the
vibration preventing members 14 and the holding members 1 in the
U-bent portion 18, the restraining force for the heat transfer
tubes 5 is 0. For this reason, when the steam generator 1 is
operated, it is possible to suppress the vibration abrasion or the
like of the bridges 17 due to the secondary cooling water that
passes through the gap formed between the regulation members 24 and
the U-bent portion 18. As a result, the quake-resistant structure
20 with the annular member 21 may suppress degradation in
resistance by suppressing the influence on the resistance with
respect to the flow resistance of the heat transfer tube 5.
Further, when the U-bent portion 18 and the bridges 17 are vibrated
by an earthquake or the like, the regulation members 24 which are
supported by the cylinder portion 2 through the annular members 21,
the second support members 22, and the third support members 23
regulate the vibration of the bridges 17. Since the bridges 17
support the plurality of heat transfer tubes 5 of the U-bent
portion 18, such a vibration is also regulated by the regulation
members 24. Since the gap between the regulation member 24 and the
bridge 17 is smaller than the gap between the annular member 21 and
each of the plurality of heat transfer tubes 5 of the U-bent
portion 18, it is possible to further effectively suppress the
vibration of the U-bent portion 18 by using the regulation members
24. As a result, the quake-resistant structure 20 with the
regulation member 24 may further reliably ensure the quake
resistance of the U-bent portion 18.
[0110] In this embodiment, the plurality of annular members 21 are
arranged toward the top portion 18T of the U-bent portion 18. More
specifically, two annular members 21A and 21B are arranged from the
tube support plate 6 toward the top portion 18T of the U-bent
portion 18. In this way, it is possible to further ensure the quake
resistance by further reliably suppressing the vibration of the
U-bent portion 18. The number of the annular members 21 is not
limited to two, and may be three or more. Further, if the quake
resistance of the U-bent portion 18 may be ensured by one annular
member 21, one annular member 21 may be provided.
[0111] When the quake-resistant structure 20 includes the plurality
of annular members 21, it is desirable to overlap the plurality of
second support members 22 and the plurality of second members 23
between the plurality of annular members 21 when viewed from a
direction in which the plurality of annular members 21 are
arranged. In this way, it is possible to suppress the disturbance
of the flow of the secondary cooling water from the tube support
plate 6 toward the top portion 18T of the U-bent portion 18.
Furthermore, this does not exclude a case in which the plurality of
second support members 22 overlap each other and the plurality of
third support members 23 overlap each other when viewed from a
direction in which the plurality of annular members 21 are
arranged.
[0112] FIG. 10 is a plan view illustrating a quake-resistant
structure according to a modified example of the first embodiment.
In the quake-resistant structure 20 illustrated in FIG. 7, the
second support members 22 and the third support members 23 extend
radially from the annular members 21, but a quake-resistant
structure 20a of the modified example is different in that second
support members 22a and third support members 23a do not extend
radially from the annular member 21a. When the second support
members 22 and the third support members 23 radially extend from
the annular members 21, the support members extend in a direction
parallel to the radial direction of the annular member 21. That is,
the second support members 22 and the third support members 23
extend in a direction perpendicular to the tangential line of the
outer peripheral portion of the annular member 21. In the modified
example, the second support members 22a and the third support
members 23a extend in a direction other than the direction
perpendicular to the tangential line of the outer peripheral
portion of the annular member 21a. Even in this way, the annular
members 21a are supported by the cylinder portion 2 through the
second support member 22a and the third support member 23a.
[0113] In this embodiment, the annular members 21 and 21a are
described as an example of the first support member, but the first
support member is not limited to the annular member 21 and the
like. That is, the first support member may be a member that
surrounds the periphery of the U-bent portion 18 and is provided
between the outer periphery and the tube bundle shroud 3
surrounding the outer peripheral portion of the U-bent portion 18
so as to have a predetermined gap with respect to the U-bent
portion 18. Thus, the first support member may be, for example, a
basket-like member that surrounds the U-bent portion 18.
[0114] (Modified Example of Regulation Member of the First
Embodiment)
[0115] FIGS. 11 to 14 are diagrams illustrating modified examples
of the regulation member of the first embodiment. The regulation
member according to the modified example is different in that an
orifice is provided at a portion facing the bridge. A regulation
member 24a illustrated in FIGS. 11 and 12 includes a plurality of
orifices 25 which penetrate an outer portion 24Y from the portion
facing the bridge 17a inside the groove portion 24S. Both side
surfaces 17Sa of the bridge 17a are sandwiched in the regulation
member 24a, but the regulation member 24a includes the orifices 25
at the portions facing both side surfaces 17Sa. Furthermore, in the
bridge 17a, the portion (the bridge end) 17Ta which is sandwiched
in the groove portion 24S of the regulation member 24a has a width
larger than those of the other portions. The regulation member 24a
includes extension portions 24E which extend from both outer
portions 24Y to the opening portion of the groove portion 24S.
Since the dimension between both extension portions 24E is smaller
than that of the bridge end 17Ta, the separation of the bridge 17a
from the groove portion 24S is prevented. As illustrated in FIG.
12, the inner diameter of the inner portion of the orifice 25 is
smaller than that of the opening portion of the orifice, but the
orifice 25 is not limited to the shape.
[0116] A predetermined gap Ca is formed between the groove portion
24S of the regulation member 24a and both side surfaces 17Sa of the
bridge end 17Ta. Further, a predetermined gap Cb is formed between
the extension portion 24E and the bridge end 17Ta. Since the
regulation member 24 has the orifices 25, the inflow and the
outflow of the secondary cooling water inside the groove portion
24S occur from the orifices 25 when the bridge end. Ta moves inside
the groove portion 24S. Accordingly, since it is possible to obtain
a damping action that damps the vibration of the bridge 17a, it is
possible to alleviate an abrupt change in acceleration acting on
the plurality of heat transfer tubes 5 of the U-bent portion 18. As
a result, the quake resistance of the U-bent portion 18 is further
improved. Furthermore, the inflow and the outflow of the secondary
cooling water occur even from the predetermined gap Cb formed
between the extension portion 24E and the bridge end 17Ta. As a
result, since it is possible to obtain a damping action that damps
the vibration of the bridge 17a even by this configuration, the
quake resistance of the U-bent portion 18 is further improved.
[0117] A regulation member 24b illustrated in FIG. 13 includes an
intermediate support member 26 which has a. U-shaped cross-section,
faces both side surfaces 17S of the bridge 17, and is provided
inside the groove portion 24S. A spring 28 is disposed between the
intermediate support member 26 and the regulation member 24b. The
spring 28 applies a force directed toward the bridge 17 to the
intermediate support member 26. Further, as in the regulation
member 24a illustrated in FIGS. 11 and 17, the regulation member
24b includes the plurality of orifices 25 which penetrate the outer
portion 24Y from the portion facing the bridge 17 inside the groove
portion 24S. With such a structure, the regulation member 24b may
obtain an impact absorbing action using the spring 28 in addition
to the action that damps the vibration of the bridge 17 by the
orifices 25. As a result, the regulation member 24b may further
improve the quake resistance of the U-bent portion 18.
[0118] As in the regulation member 24b illustrated in FIG. 13, a
regulation member 24c illustrated in FIG. 14 includes an
intermediate support member 26c that faces both side surfaces 17r
of the bridge 17 and is provided inside the groove portion 24S, but
has a difference in that two plate-like intermediate support
members 26c nip the bridge end 17Tc. For this reason, two
intermediate, support members 26c are close to the bridge end 17Tc.
Further, the bridge, end 17Tc has a circular cross-section. In this
way, the inclination of the bridge 17c with respect to the
intermediate support member 26c may be allowed.
[0119] The spring 28 is disposed between each intermediate support
member 26c and the regulation member 24c. The spring 28 applies a
force directed toward the bridge 17 to the intermediate support
member 26. With such a structure, as in the regulation member 24b,
the regulation member 24c may obtain an impact absorbing action
using the spring 28 in addition to the action that damps the
vibration of the bridge 17c by the orifices 25. As a result, the
regulation member 24c may further improve the quake resistance of
the U-bent portion 18.
Second Embodiment
[0120] In the steam generator 1 of the embodiment, a partition
plate is provided in the U-bent portion 18 so as to ensure the
quake resistance of the U-bent portion 18. FIG. 15 is a side view
illustrating a partition plate of the steam generator according to
a second embodiment. FIG. 16 is a gross-sectional view taken along
the line B-B of FIG. 15.
[0121] As illustrated in FIG. 15, a partition plate 30 is inserted
between the heat transfer tubes 5 of the U-bent portion 18.
Specifically, the partition plate 30 is inserted between the heat
transfer tube layers 5A. Further, the vibration preventing member
14 is provided between the heat transfer tube layer 5A and the
partition plate 30. That is, the partition plate 30 is disposed at
a position where at least one heat transfer tube layer 5A is
disposed so as to replace the heat transfer tube layer 5A. Then, as
illustrated in FIG. 16, the partition plate 30 is provided so as to
overlap the entire adjacent heat transfer tube layer 5A. The
partition plate 30 is fixed to the tube support plate 6 as the
support portion which is supported by the cylinder portion 2
through the tube bundle shroud 3. Accordingly, the partition plate
is supported to the cylinder portion 2 accommodating the heat
transfer tubes 5 of the steam generator 1 and is provided so as to
divide the U-bent portion 18 into a plurality of portions. The
partition plate 30 illustrated in FIGS. 15 and 16 is provided at
the center (the position of the center line. S) of the U-bent
portion 18 so as to divide the U-bent portion 18 into two portions.
Furthermore, the partition plate 30 may be disposed so as to
contact the heat transfer tube 5, the vibration preventing member
14, the holding member 16, and the attachment portion 17 as the
constituents of the U-bent portion 18 or to be separated
therefrom.
[0122] According to the steam generator 1, since the deformation of
the heat transfer tube 5 inside the U-bent portion 18 is suppressed
by the partition plate 30, it is possible to ensure the quake
resistance of the U-bent portion 18 by decreasing the stress
applied to the U-bent portion 18 with respect to the excessive
excitation force to the allowable stress or less.
[0123] FIG. 17 is a side view illustrating another embodiment of
the partition plate of the steam generator according to the second
embodiment. In the embodiment illustrated in FIG. 17, the partition
plates 30 are provided at a plurality of positions. Each partition
plate 30 is inserted between the heat transfer tubes 5 at a
plurality of (here, two) positions of the U-bent portion 18.
Specifically, the partition plate 30: is inserted between the heat
transfer tube layers 5A. Further, the vibration preventing member
14 is provided between the heat transfer tube layer 5A and the
partition plate 30. That is, the partition plate 30 is disposed at
a position where at least one heat transfer tube layer 5A is
disposed so as to replace the heat transfer tube layer 5A. Then,
the partition plate 30 is provided so as to overlap the entire
adjacent heat transfer tube layer 5A. The partition plate 30 is
fixed to the tube support plate 6 as the support portion which is
supported by the cylinder portion 2 through the tube bundle shroud
3. Accordingly, the partition plate is supported to the cylinder
portion 2 accommodating the heat transfer tubes 5 of the steam
generator 1, and is provided so as to divide the U-bent portion 1B
into a plurality of portions. The partition plate 30 illustrated in
FIG. 17 is provided so as to divide the U-bent portion 18 into
three portions in the horizontal direction. Furthermore, the
partition plate 30 may be disposed so as to contact the heat
transfer tube 5, the vibration preventing member 14, the holding
member 16, and the attachment portion 17 as the constituents of the
U-bent portion 18 or to be separated therefrom.
[0124] When an oscillation is transmitted to the steam generator 1
by an earthquake or the like, a large excitation force is applied
to the U-bent portion 18 at the upper end side of the heat transfer
tube group 51 of which the end facing the downside with respect to
the tube sheet 4. In particular, the excitation force is easily
applied in a direction of overlapping the heat transfer tube layers
5A constituting the heat transfer tube group 51. For this reason,
according to the steam generator 1 of the second embodiment, since
the deformation of the heat transfer tubes 5 at a plurality of
positions inside the U-bent portion 18 is suppressed by the
partition plate 30, it is possible to further ensure the quake
resistance of the U-bent portion 18 by decreasing the stress
applied to the U-bent portion 18 with respect to the excessive
excitation force to the allowable stress or less.
[0125] FIG. 18 is a side view illustrating another embodiment of
the partition plate of the steam generator according to the second
embodiment. In the embodiment illustrated in FIG. 18, the partition
plate 30 is inserted between the heat transfer tubes 5 of the
U-bent portion 18. Specifically, the partition plate 30 is provided
by overlapping a plurality of (here, five) partition plates 30a,
and is inserted between the heat transfer tube layers 5A. Further,
the vibration preventing member 14 is provided between the heat
transfer tube layer 5A and the partition plate 30. That is, the
partition plate 30: is disposed at a position where at least three
heat transfer tube layers 5A are disposed so as to replace the heat
transfer tube layer 5A and the vibration preventing member 14.
Then, the partition plate 30: is provided so as to overlap the
entire adjacent heat transfer tube layer 5A. The partition plate 30
is fixed to the tube support plate 6 as the support portion which
is supported by the cylinder portion 2 through the tube bundle
shroud 3. Accordingly, the partition plate is supported to the
cylinder portion 2 accommodating the heat transfer tube 5 of the
steam generator 1, and is provided so as to divide the U-bent
portion 18 into a plurality of portions. The partition plate 30
illustrated in FIG. 18 is provided at the center (the position of
the center line S) of the U-bent portion 18 so as to divide the
U-bent portion 18 into two portions. Furthermore, the partition
plate 30 may be disposed so as to contact the heat transfer tube 5,
the vibration preventing member 14, the holding member 16, and the
attachment portion 17 as the constituents of the U-bent portion 18
or to be separated therefrom.
[0126] According to the steam generator 1, since the deformation of
the heat transfer tubes 5 inside the U-bent portion 18 is
suppressed by the partition plates 30 which overlap each other so
as to improve the rigidity thereof, it is possible to further
ensure the quake resistance of the U-bent portion 18 by decreasing
the stress applied to the U-bent portion 18 with respect to the
excessive excitation force to the allowable stress or less.
[0127] Furthermore, in this embodiment, the partition plate 30 is
provided between the heat transfer tubes 5 (the heat transfer tube
layers 5A), and the vibration preventing member 14 is provided
between the partition plate 30 and the heat transfer tube 5. For
this reason, when a fluid excitation oscillation occurs, it is
possible to appropriately suppress the deflection of the heat
transfer tube 5 (the heat transfer tube layer 5A) adjacent to the
partition plate 30 by the vibration preventing member 14.
[0128] FIG. 19 is a cross-sectional view illustrating the partition
plate of the steam generator according to the second embodiment. In
the embodiment illustrated in FIG. 19, penetration holes 31 are
provided in the partition plate 30. The plurality of penetration
holes 31 are provided so as to penetrate the plate thickness of the
partition plate 30.
[0129] According to the steam generator 1, it is possible to ensure
the quake resistance of the U-bent portion 18 by the partition
plate 30 and to ensure the flowability of the secondary cooling
water by the penetration hole 31. Accordingly, it is possible to
ensure the steam generation efficiency. Furthermore, as the
partition plate 30 with the penetration holes 31, the partition
plate 30 may be formed in a mesh shape or a lattice shape other
than the configuration in which the holes penetrate the plate
member.
[0130] FIG. 20 is a cross-sectional view illustrating the partition
plate of the steam generator according to the second embodiment. In
the embodiment illustrated in FIG. 20, the penetration hole 31 is
formed as an orifice.
[0131] According to the steam generator 1, the steam generation
efficiency may be ensured by ensuring the flowability of the
secondary cooling water through the hole. Then, when the partition
plate 30 is vibrated due to an earthquake or the like, the
vibration may be damped.
[0132] FIG. 21 is a side view illustrating the support portion of
the steam generator according to the second embodiment FIG. 22 is a
perspective view illustrating the support portion of the steam
generator according to the second embodiment, and FIG. 23 is a plan
view illustrating the support portion of the steam generator
according to the second embodiment.
[0133] As illustrated in FIG. 21, a support portion 35 includes
annular portions 35a, tube bundle shroud inner members 35b, and
tube bundle shroud outer members 35c.
[0134] As illustrated in FIGS. 21 to 23, the annular portions 35a
are provided at the inside of the tube bundle shroud 3 surrounding
the outer peripheral portion of the U-bent portion 18 so as to
surround the U-bent portion 18. In this embodiment, two annular
portions 35a are disposed at the upper and lower sides. Each
annular portion 35a may be obtained by forming a hollow cylindrical
tube in an annular shape or forming a solid bar-like body in an
annular shape.
[0135] As illustrated in FIGS. 21 to 23, the tube bundle shroud
inner members 35b are interposed between the tube bundle shroud 3
and the annular portions 35a at the inside of the tube bundle
shroud 3 so as to support the respective annular portions 35a. The
tube bundle shroud inner members 35b are provided at the outside of
the respective annular portions 35a in the radial direction, and
are formed as a plurality of bar-like bodies extending radially
from the annular portion 35a toward the tube bundle shroud 3. The
ends of the tube bundle shroud inner members 35b opposite to the
annular portions 35a are attached to the tube bundle shroud 3
through the pedestals 35d fixed to the inner wall surface of the
tube bundle shroud 3. The tube bundle shroud inner members 35b and
the pedestals 35d are attached to each other by, for example,
welding. Further, the pedestals 35d are fixed to the tube bundle
shroud 3 by, for example, a fastening member such as a bolt. Each
tube bundle shroud inner member 35b may be a hollow circular tube
or a solid bar-like body.
[0136] As illustrated in FIGS. 21 to 23, the tube bundle shroud
outer members 35c are interposed between the tube bundle shroud 3
and the cylinder portion 2 at the outside of the tube bundle shroud
3 so as to support the respective tube bundle shroud inner members
35b. The tube bundle shroud outer members 35c are provided so as to
be continuous to the outside of the respective tube bundle shroud
inner members 35b through the tube bundle shroud 3, and are formed
as bar-like bodies connecting the tube bundle shroud 3 and the
cylinder portion 2 to each other. In each tube bundle shroud outer
member 35c, one end thereof is attached to the tube bundle shroud 3
through the pedestal 35d fixed to the outer wall surface of the
tube bundle shroud 3, and the other end thereof is attached to the
cylinder portion 2 through the pedestal 35d fixed to the inner wall
surface of the cylinder portion 2. The tube bundle shroud outer
member 35c and the pedestal 35d are attached to each other by, for
example, welding. Further, the pedestal 35d is fixed to the tube
bundle shroud 3 or the cylinder portion 2 by, for example, a
fastening member such as a bolt. The tube bundle shroud outer
member 35c may be a hollow circular tube or a solid bar-like
body.
[0137] That is, the annular portions 35a are supported to the
cylinder portion 2 and the tube bundle shroud 3 by the tube bundle
shroud inner members 35b and the tube bundle shroud outer members
35c. Then, the supported annular portions 35a are arranged at a
predetermined interval so as not to contact the U-bent portion 18
and the tube bundle shroud 3.
[0138] The partition plate 30 is supported to the support portion
35.s illustrated in FIG. 21, the partition plate 30 is supported to
a support member 35e extending from the annular portion 35a.
Furthermore, it is desirable to support the partition plate 30 by a
plurality of (here, two) annular portions 35a when ensuring the
support force.
[0139] In this way, since the partition plate 30 is supported by
the support portion 35, the partition plate 30 may be supported to
the cylinder portion 2 by being inserted between the heat transfer
tubes 5 of the U-bent portion 18. Furthermore, in a case where the
support portion 35 is used, the partition plate 30 may be separated
from the tube support plate 6 if necessary.
[0140] FIG. 24 is a side view illustrating another embodiment of
the support portion of the steam generator according to the second
embodiment.
[0141] As illustrated in FIG. 24, a support portion 36 includes
tube bundle shroud outer members 36a. The tube bundle shroud outer
members 36a are provided between the tube bundle shroud 3 and the
cylinder portion 2 at the outside of the tube bundle shroud 3. The
tube bundle shroud outer member 36a is provided so as to be
continuous to the end of the partition plate 30 extending to the
tube bundle shroud 3 through the tube bundle shroud 3, and is
formed as a bar-like body connecting the tube bundle shroud 3 and
the cylinder portion 2 to each other. In the tube bundle shroud
outer member 36a, one end thereof is attached to the tube bundle
shroud 3 through a pedestal 36b fixed to the outer wall surface of
the tube bundle shroud 3, and the other end thereof is attached to
the cylinder portion 2 through the pedestal 36b fixed to the inner
wall surface of the cylinder portion 2. The tube bundle shroud
outer member 36a and the pedestal 36b are attached to each other
by, for example, welding. Further, the pedestal 36b is fixed to the
tube bundle shroud 3 or the cylinder portion 2 by, for example, a
fastening member such as a bolt. The tube bundle shroud outer
member 36a may be a hollow circular tube or a solid bar-like
body.
[0142] The partition plate 30 is supported to the support portion
36. The partition plate 30 is supported by the tube bundle shroud 3
through the pedestal 3b fixed to the inner wall surface of the tube
bundle shroud 3 so that the end thereof extends to the tube bundle
shroud 3 so as to be continuous to the inside of the tube bundle
shroud outer member 36a. Furthermore, it is desirable to support
the end of the partition plate 30 by a plurality of (here, three)
tube bundle shroud outer members 36a when ensuring the support
force.
[0143] In this way, since the partition plate 30 is supported by
the support portion 36, the partition plate 30 may be supported to
the cylinder portion 2 by being inserted between the heat transfer
tubes 5 of the U-bent portion 18. Furthermore, in a case where the
support portion 36 is used, the partition plate 30 may be separated
from to tube support plate 6 if necessary.
[0144] FIG. 25 is a side view illustrating another embodiment of
the support portion of the steam generator according to the second
embodiment.
[0145] As illustrated in FIG. 25, a support portion 37 includes
tube bundle shroud inner members 37a and tube bundle shroud outer
members 37b.
[0146] The tube bundle shroud inner members 37a are provided
between the plate surface of the partition plate 30 and the tube
bundle shroud 3 at the inside of the tube bundle shroud 3. The tube
bundle shroud inner members 37a are formed as bar-like bodies
extending toward the inner wall surface at the center of the tube
bundle shroud 3. The ends of the tube bundle shroud inner members
37a near the tube bundle shroud 3 are attached to the tube bundle
shroud 3 through pedestals 37c fixed to the inner wall surface of
the tube bundle shroud 3. The tube bundle shroud inner member 36a
and the pedestal 36b are attached to each other by, for example,
welding. Further, the pedestal 36b is fixed to the tube bundle
shroud 3 by, for example, a fastening member such as a bolt. The
tube bundle shroud inner member 37a may be a hollow circular tube
or a solid bar-like body.
[0147] The tube bundle shroud outer members 37b are interposed
between the tube bundle shroud 3 and the cylinder portion 2 at the
outside of the tube bundle shroud 3 so as to support the respective
tube bundle shroud inner members 37a. The tube bundle shroud outer
members 37b are provided so as to be continuous to the outside of
the respective tube bundle shroud inner members 37a through the
tube bundle shroud 3, and are formed as bar-like bodies connecting
the tube bundle shroud 3 and the cylinder portion 2 to each other.
In the tube bundle shroud outer member 37b, one end thereof is
attached to the tube bundle shroud 3 through the pedestal 37c fixed
to the outer wall surface of the tube bundle shroud 3, and the
other end thereof is attached to the cylinder portion 2 through the
pedestal 37c fixed to the inner wall surface of the cylinder
portion 2. The tube bundle shroud outer member 37b and the pedestal
37c are attached to each other by, for example, welding. Further,
the pedestal 37c is fixed to the tube bundle shroud 3 or the
cylinder portion 2 by, for example, a fastening member such as a
bolt. The tube bundle shroud outer member 37b may be a hollow
circular-tube or a solid bar-like body.
[0148] The partition plate 30 is supported to the support portion
37. The partition plate 30 is supported to the tube bundle shroud
inner member 37a through the pedestal 37c so as to be sandwiched
between the respective tube bundle shroud inner members 37a
extending toward both plate surfaces. Furthermore, it is desirable
to support the partition plate 30 by sandwiching both plate
surfaces thereof at a plurality of positions (here, six positions
in total by three positions for each end side of the partition
plate 30) by the tube bundle shroud inner members 37a when ensuring
the support force.
[0149] In this way, since the partition plate 30 is supported by
the support portion 36, the partition plate 30 may be supported to
the cylinder portion 2 by being inserted between the heat transfer
tubes 5 of the U-bent portion 18. Furthermore, in a case where the
support portion 37 is used, the partition plate 30 may be separated
from the tube support plate 6 if necessary.
[0150] FIG. 26 is a schematic diagram illustrating a bonding
mechanism of the steam generator according to the second
embodiment.
[0151] As illustrated in FIG. 26, in the steam generator 1 of the
embodiment, a bonding mechanism 38 is provided between each of the
support portions 35, 35, and 37 and the partition plate 30 or
between the members of the support portions 35, 36, and 37 so as to
bond them to each other with a predetermined gap E
therebetween.
[0152] In FIG. 26, the bonding mechanism 33 is provided between the
partition plate 30 and the support member 35e of the support
portion 35, between the partition plate 30 and the pedestal 36b at
the inside of the tube bundle shroud 3 of the support portion 3, or
between the partition plate 30 and the pedestal 37c of the support
portion 37 near the partition plate 30 so as to bond them to each
other with the gap E so that the partition plate 30 is interposed
therebetween.
[0153] Further, although not illustrated in the drawings, the
bonding mechanism 38 may be provided between the support member 35e
and the annular portion 35a of the support portion 35, between the
annular portion 35a and the tube bundle shroud inner member 35b,
between the tube bundle shroud inner member 35b and the pedestal
35d at the inside of the tube bundle shroud 3, the tube bundle
shroud outer member 35c and the pedestal 35d at the outside of the
tube bundle shroud 3, or the tube bundle shroud outer member 35c
and the pedestal 35d near the cylinder portion 2.
[0154] Further, although not illustrated in the drawings, the
bonding mechanism 38 may be provided between the tube bundle shroud
outer member 36a and the pedestal 3b at the outside of the tube
bundle shroud 3 of the support portion 36 or between the tube
bundle, shroud outer member 36a and the pedestal 36b near the
cylinder portion 2.
[0155] Further, although not illustrated in the drawings, the
bonding mechanism 36 may be provided between the tube bundle shroud
inner member 37a and the pedestal 37c near the partition plate 30
of the support portion 37, between the tube bundle shroud inner
member 37a and the pedestal 37c at the inside of the tube bundle
shroud 3, between the tube bundle shroud outer member 37b and the
pedestal 37c at the outside of the tube bundle shroud 3, or between
the tube bundle shroud outer member 37b and the pedestal 37c near
the cylinder portion 2.
[0156] In this way, since the bonding mechanism 38 is provided
between each of the support portions 35, 36, and 37 and the
partition plate 30 or the members of the support portions 35, 36,
and 37 so as to bond them to each other with the predetermined gap
E therebetween, the members are not strongly fixed to each other by
the bonding mechanism 38. For this reason, it is possible to
prevent the vibration during the general operation of the steam
generator 1 from being transmitted to the cylinder portion 2 or the
partition plate 30.
[0157] FIG. 27 is a schematic diagram illustrating a damping
mechanism of the steam generator according to the second
embodiment.
[0158] As illustrated in FIG. 27, in the steam generator 1 of the
embodiment, a damping mechanism 39 is provided between each of the
support portions 35, 36, and 37 and the partition plate 30 or
between the members of the support portions 35, 36, and 37 so as to
connect them to each other and damps the relative movement thereof
while allowing the movement.
[0159] In FIG. 27, the damping mechanism 39 is provided between the
partition plate 30 and the support member 35e of the support
portion 35, between the partition plate 30 and the pedestal 36b at
the inside of the tube bundle shroud 3 of the support portion 36,
or between the partition plate 30 and the pedestal 37c near the
partition plate 30 of the support portion 37 so as to damp the
relative movement thereof while allowing the movement.
[0160] For example, in the damping mechanism 39, one side (the
partition plate 30 in FIG. 27) is connected to a piston rod 39b
provided with a piston 39a and one side (the support member 35e,
the pedestal 36b, and the pedestal 37c in FIG. 27) is connected to
an outer cylinder 39c accommodating the piston 39a. The outer
cylinder 39c is provided so that a free piston 39d forms a gas
chamber 39e therein. Further, a fluid (for example, water) like the
secondary cooling water inside the steam generator 1 is stored in a
portion where the piston 39a moves in a region other than the gas
chamber 39e inside the outer cylinder 39c. Furthermore, in FIG. 27,
the damping mechanisms 39 are provided at both sides of the
partition plate 30, but the damping mechanism 39 may be provided
only at one side thereof.
[0161] Further, although not illustrated in the drawings, the
damping mechanism 39 may be provided between the support member 35e
and the annular portion 35a of the support portion 35, between the
annular portion 35a and the tube bundle shroud inner member 35b,
between the tube bundle shroud inner member 35b and the pedestal
35d at the inside of the tube bundle shroud 3, between the tube
bundle shroud outer member 35c and the pedestal 35d at the outside
of the tube bundle shroud 3, or between the tube bundle shroud
outer member 35c and the pedestal 35d near the cylinder portion
2.
[0162] Further, although not illustrated in the drawings, the
damping mechanism 39 may be provided between the tube bundle shroud
outer member 36a and the pedestal 36b at the outside of the tube
bundle shroud 3 in the support portion 36 or between the tube
bundle shroud outer member 36a and the pedestal 3b near the
cylinder portion 2.
[0163] Further, although not illustrated in the drawings, the
damping mechanism 39 may be provided between the tube bundle shroud
inner member 37a and the pedestal 37c near the partition plate 30
in the support portion 37, between the tube bundle shroud inner
member 37a and the pedestal 37c at the inside of the tube bundle
shroud 3, between the tube bundle shroud outer member 37b and the
pedestal 37c at the outside of the tube bundle shroud 3, or between
the tube bundle shroud outer member 37b and the pedestal 37c near
the cylinder portion 2.
[0164] In this way, since the oscillation generated between each of
the support portions 35, 36, and 37 and the partition plate 30 or
between the members of the support portions 35, 36, and 37 is
damped by the damping mechanism 39, the quake resistance of the
U-bent portion may be further ensured.
[0165] FIG. 28 is a schematic diagram illustrating another
embodiment of the damping mechanism of the steam generator
according to the second embodiment.
[0166] In the steam generator 1 of the embodiment, a damping
mechanism 40 is provided between each of the support portions 35,
36, and 37 and the partition plate 30 or between the members of the
support portions 35, 36, and 37 so as to connect them to each other
and damps the relative movement thereof while allowing the
movement.
[0167] In the damping mechanism 40, one (the partition plate 30 in
FIG. 28) of the support portions 35, 36, and 37 and the partition
plate 30 is sandwiched between the other members (the support
member 35e, the pedestal 36b, and the pedestal 37c in FIG. 28), and
a friction generating portion 40a is provided between the relative
surfaces thereof. As the friction generating portion 40a, it is
desirable to employ a friction generating portion which applies a
frictional force for damping the oscillation between the relative
surfaces when deflection occurs. Further, a sandwiching force may
be adjusted by a fastening force of a bolt so as to adjust the
frictional force between the relative surfaces. Furthermore, in
FIG. 28, the support members 35e, the pedestals 36b, and the
pedestals 37c are provided at both sides of the partition plate 30,
but these members may be arranged at the opposite positions.
[0168] Further, although not illustrated in the drawings, the
damping mechanism 40 may be provided between the support member 35e
and the annular portion 35a of the support portion 35, between the
annular portion 35a and the tube bundle shroud inner member 35b,
between the tube bundle shroud inner member 35b and the pedestal
35d at the inside of the tube bundle shroud 3, between the tube
bundle shroud outer member 35c and the pedestal 35d at the outside
of the tube bundle shroud 3, or between the tube bundle shroud
outer member 35c and the pedestal 35d near the cylinder portion
2.
[0169] Further, although not illustrated in the drawings, the
damping mechanism 40 may be provided between the tube bundle shroud
outer member 36a and the pedestal 3b at the outside of the tube
bundle shroud 3 of the support portion 36 or between the tube
bundle shroud outer member 36a and the pedestal 35b near the
cylinder portion 2.
[0170] Further, although not illustrated in the drawings, the
damping mechanism 40 may be provided between the tube bundle shroud
inner member 37a and the pedestal 37c near the partition plate 30
of the support portion 37, between the tube bundle shroud inner
member 37a and the pedestal 37c at the inside of the tube bundle
shroud 3, between the tube bundle shroud outer member 37b and the
pedestal 37c at the outside of the tube bundle shroud 3, or between
the tube bundle shroud outer member 37b and the pedestal 37c near
the cylinder portion 2.
[0171] In this way, since the oscillation generated between each of
the support portions 35, 35, and 37 and the partition plate 30 or
between the members of the support portions 35, 36, and 37 is
damped by the damping mechanism 40, the quake resistance of the
U-bent portion 18 may be further ensured.
Third Embodiment
[0172] FIG. 29 is a perspective view illustrating a U-bent portion
of a steam generator according to a third embodiment. FIG. 30 is a
longitudinal sectional view illustrating a relation of a vibration
preventing member, a holding member, and a bridge in the
out-of-plane direction of the steam generator according to the
third embodiment. FIG. 31 is a plan view illustrating a
quake-resistant structure of the steam generator according to the
third embodiment. FIG. 32 is a longitudinal sectional view
illustrating the quake-resistant structure of the steam generator
according to the third embodiment. FIG. 33 is a longitudinal
sectional view illustrating a relation of a bridge and a regulation
member in the out-of-plane direction of the quake-resistant
structure of the steam generator according to the third
embodiment.
[0173] As illustrated in FIGS. 29 to 32, the quake-resistant
structure (hereinafter, referred to as the quake-resistant
structure) of the steam generator 1 of the embodiment includes a
beam member 81 that is disposed at the top portion side (the upper
side) of the U-bent portion 18, an outer tube support member 83
that connects the tube bundle shroud 3 and the cylinder portion 2
to each other, and a movement regulation portion 90 that regulates
the relative m of the U-bent portion 18 with respect to the beam
member 81.
[0174] The beam member 81 is disposed at the top portion side of
the U-bent portion 18 with a gap with respect to the U-bent
portion. The beam member 81 is formed in a bar shape which extends
in the out-of-plane direction D1 of the U-bent portion 18, and both
ends thereof are respectively fixed to the inner peripheral surface
of the tube bundle shroud 3. Further, in the beam member 81, a
portion excluding both ends thereof in the extension direction is
curved along the semi-spherical surface of the U-bent portion 18.
Accordingly, the portion is disposed so as to face the
semi-spherical surface of the U-bent portion 18 with a constant gap
therebetween. The beam member 81 of the embodiment is formed as,
for example, a single steel member.
[0175] A plurality of (here, three) beam members 81 are provided
with a gap therebetween in the in-plane direction D2, that is, the
horizontal direction following the plane including the bent portion
5U of the heat transfer tube 5 of the U-bent portion 18. In other
words, a plurality of (here, three) beam members 81 are provided
with a gap therebetween in the extension direction of the bent
portion 5U. Furthermore, it is desirable that the cross-sectional
shape of the beam member 81 in a direction perpendicular to the
extension direction have, for example, a vane shape so as to reduce
the flow resistance of the fluid around the beam member 81.
[0176] As illustrated in FIGS. 31 and 32, a plurality of the outer
tube support member 83 are disposed throughout the outer peripheral
surface of the tube bundle shroud 3 and the inner peripheral
surface of the cylinder portion 2, and are provided with a gap
therebetween in the circumferential direction of the tube bundle
shroud 3 and the cylinder portion 2. Each outer tube support member
83 includes a bar portion 84 which extends in the radial direction
of the tube bundle shroud 3 and the cylinder portion 2 and an inner
pedestal 85 and an outer pedestal 86 which are fixed to both ends
of the bar portion 84.
[0177] The inner pedestal 85 is integrally fixed to the inner end
of the bar portion 84 in the radial direction of the tube bundle
shroud 3 and the cylinder portion 2 by, for example, welding or the
like, and is fixed to the outer peripheral surface of the tube
bundle shroud 3 by, for example, a fastening member such as a bolt.
The outer pedestal 36 is integrally fixed to the outer end of the
bar portion 84 in the radial direction of the tube bundle shroud 3
and the cylinder portion 2 by, for example, welding or the like as
in the inner pedestal 85, and is fixed to the inner peripheral
surface of the cylinder portion 2 by, for example, a fastening
member such as a bolt. With such a structure, the outer tube
support member 83 connects the cylinder portion 2 and the tube
bundle shroud 3 to each other.
[0178] The movement regulation portion 90 includes the vibration
preventing member 14, the holding member 16, and the bridge 17 and
further includes a regulation member 91.
[0179] As illustrated in FIGS. 29, 30, 32, and 33, a plurality of
regulation members 91 are fixed to the surface of the beam member
81 facing the inner side of the semi-spherical U-bent portion 18 in
the radial direction, and are provided with a gap therebetween in
the extension direction of the beam member 81. The regulation
members 91 are provided so as to make a pair with the plurality of
bridges 17. That is, the regulation members 91 are provided at
positions corresponding to the plurality of bridges 17 which are
disposed with a gap therebetween in the out-of-plane direction
D1.
[0180] Each regulation member 91 regulates the movement of the
bridge 17 in the out-of-plane direction D1 by sandwiching the
bridge 17, connecting the bonding members 15 as the ends of the
plurality of vibration preventing members 14 disposed between the
heat transfer tubes 5 of the U-bent portion 18, with a
predetermined gap therebetween in the out-of-plane direction D1.
The regulation member 91 includes a groove portion 92 which is
recessed toward the outside in the radial direction at the surface
of the regulation member 91 facing the inside of the semi-spherical
U-bent portion 18 in the radial direction. The bridge 17 is
sandwiched in the groove portion 92 with a predetermined gap
therebetween. The regulation member 91 is bonded by a bonding
method, for example, welding or the like. Since the regulation
member 91 and the bridge 17 have a predetermined gap (for example,
about 5 mm to 10 mm) in the out-of-plane direction D1, a gap is
formed therebetween.
[0181] According to the steam generator 1 with the above-described
configuration, when an earthquake or the like is generated, an
earthquake acceleration is applied to the U-bent portion 18 in the
out-of-plane direction D1, and the U-bent portion 18 is vibrated,
the vibration of the U-bent portion 18 in the out-of-plane
direction D1 may be received by the beam member 81 that extends
along the semi-spherical surface of the U-bent portion 18 in the
out-of-plane direction D1. That is, since the beam member 81 may
suppress the vibration by receiving the vibration of the U-bent
portion 18 when the U-bent portion 18 is vibrated in the
out-of-plane direction D1 more than the range of the gap between
the beam member 81 and the semi-spherical surface of the U-bent
portion 18, the quake resistance of the U-bent portion 18 may be
ensured.
[0182] Further, since the beam member 81 is disposed with a gap
respect to the U-bent portion 18 as described above, the
restraining force of the U-bent portion 18 may be reduced.
Particularly, in this embodiment, since the beam member 81 does not
restrain the heat transfer tube 5 of the U-bent portion 18, the
restraining force is not generated. For this reason, when the steam
generator 1 is operated, it is possible to suppress the vibration
abrasion or the like of the heat transfer tube 5 or the like caused
by the secondary cooling water passing between the beam member 81
and the U-bent portion 18. As a result, the quake-resistant
structure using the beam member 81 may reduce an influence on the
resistance with respect to the flow oscillation of the heat
transfer tube 5 and ensure the resistance. Further, since the beam
member 81 may be attached to even the existing steam generator 1 by
a repairing work, the quake-resistant structure may improve the
quake resistance of the existing steam generator 1.
[0183] Here, since the primary cooling water which exchanges heat
with the secondary cooling water circulates inside the heat
transfer tube 5, a difference in temperature occurs between one
side of the bent portion 5U of the heat transfer tube 5 in the
in-plane direction D2 and the other side thereof in the in-plane
direction D2. That is, the temperature of the primary cooling water
at the upstream side of the bent portion 5U (the U-bent portion 18)
becomes higher than that of the downstream side. Thus, when the
beam member 81 is disposed so as to extend in the in-plane
direction D2 along the semi-spherical surface of the U-bent portion
18, a difference in temperature also occurs in the beam member 81
in the extension direction thereof due to the influence of the heat
transmitted from the bent portion 5U. Thus, since a thermal
expansion biased in the extension direction occurs in the beam
member 81, the gap between the beam member 81 and the U-bent
portion 18 may not be maintained uniformly. Accordingly, there is a
concern that the quake resistance of the U-bent portion 18 may not
be ensured by the beam member 81.
[0184] On the contrary, in this embodiment, since the beam member
81 extends in the out-of-plane direction D1 along the
semi-spherical surface of the U-bent portion 18, a difference in
temperature does not occur in the beam member 81 in the extension
direction thereof. That is, since the temperature of the U-bent
portion 18 is uniform in the extension direction of the beam member
81, that is, the out-of-Jane direction D1, the heat is also
uniformly transmitted from the U-bent portion 18 to the beam member
81 in the out-of-plane direction D1. Thus, since the thermal
expansion of the beam member 81 is not biased in the extension
direction, the gap between the beam member 81 and the U-bent
portion 18 may be uniformly maintained. Accordingly, the quake
resistance of the U-bent portion 18 may be reliably ensured by the
beam member 81.
[0185] Further, since the steam generator 1 of the embodiment
includes the movement regulation portion 90 which regulates the
relative movement of the U-bent portion 18 with respect to the beam
member 81 in the out-of-plane direction D1, the vibration of the
U-bent portion 18 may be reliably suppressed by the beam member 81
in the event of an earthquake, and hence the restraining force of
the U-bent portion 18 may be reduced during the operation of the
steam generator 1.
[0186] That is, since the regulation member 91 attached to the beam
member 81 does not restrain the heat transfer tube 5 which is
supported by the bridge 17 through the vibration preventing member
14 in the U-bent portion 18, a restraining force with respect to
the heat transfer tube 5 is not generated. For this reason, when
the steam generator 1 is operated, the vibration abrasion or the
like of the bridge 17 caused by the secondary cooling water passing
through the gap formed between the regulation member 91 and the
U-bent portion 18 may be suppressed. Thus, it is possible to reduce
an influence on the resistance with respect to the flow oscillation
of the heat transfer tube 5 and hence to suppress degradation in
the resistance.
[0187] Further, when the U-bent portion 18 and the bridge 17 are
vibrated in the oat-of-plane direction D1 due to an earthquake or
the like, the regulation member 91 integrated with the beam member
81 regulates the vibration of the bridge 17. Since the bridge 17
supports the plurality of heat transfer tubes 5 of the U-bent
portion 18, such a vibration is also regulated by the regulation
member 91. Furthermore, when the gap between the regulation member
91 and the bridge 17 is set to be smaller than the gap between the
beam member 81 and the plurality of heat transfer tubes 5 of the
U-bent portion 18, the vibration of the U-bent portion 18 in the
out-of-plane direction D1 may be further effectively suppressed. As
a result, the quake-resistant structure with the regulation member
91 may further reliably ensure the quake resistance of the U-bent
portion 18.
[0188] Further, in this embodiment, since the outer tube support
member 83 is provided so as to connect the tube bundle shroud 3 and
the cylinder portion 2 to each other, the vibration of the U-bent
portion 18 in the out-of-plane direction D1 may be received by the
cylinder portion 2 through the beam member 81, the tube bundle
shroud 3, and the outer tube support member 83. Accordingly, the
quake resistance of the U-bent portion 18 may be reliably
obtained.
[0189] Moreover, since the plurality of beam members 81 are
provided with a gap therebetween in the extension direction of the
bent portion 5U, that is, the in-plane direction D2, the vibration
of the U-bent portion 18 may be further reliably suppressed and the
quake resistance may be further ensured.
[0190] FIG. 34 is a longitudinal sectional view illustrating
another embodiment of the quake-resistant structure of the steam
generator according to the third embodiment. FIG. 35 is a
longitudinal sectional view illustrating a connection position of
the divided beams of the embodiment illustrated in FIG. 34. FIG. 36
is a cross-sectional view illustrating a connection portion of the
divided beams of the embodiment illustrated in FIG. 34.
Furthermore, in another embodiment, the same sign will be given to
the same component as that of the above-described embodiment, and
the description thereof will not be repeated.
[0191] As illustrated in FIG. 34, the beam member 101 is different
from the beam member 81 of the above-described embodiment in that
the beam member 101 is obtained by connecting a plurality of
divided beams 102. That is, as illustrated in FIGS. 34 to 36, the
beam member 101 includes the plurality of (here, six) divided beams
102 and a connection pin 105 connecting the adjacent divided beams
102 to each other.
[0192] The divided beams 102 are formed in a shape in which the
beam member 101 is divided into a plurality of portions in the
extension direction thereof, and the beam member 101 is formed by
sequentially connecting the divided beams 102. As illustrated in
FIGS. 35 and 36, one end of each of the divided beams 102 is
provided with a convex portion 103 which protrudes from the one
end, and the other end of each of the divided beams 102 is provided
with a concave portion 104 which is recessed from the other end and
is fittable to the convex portion 103. Then, the divided beams 102
are connected to each other in a manner such that the convex
portion 103 and the concave portion 104 are connected to each other
while being fitted to each other by the connection pin 105.
[0193] The connection pin 105 includes a pin body 106 that
penetrates the convex portion 103 and the concave portion 104 which
are fitted to each other at the adjacent position and a welded
portion 107 that is formed at both ends of the pin body 106. That
is, the connection pin 105 prevents the separation of the pin body
106 from the convex portion 103 and the concave portion 104 by
forming the welded portion 107 through the buildup welding of both
ends of the pin body 106 while the pin body 106 penetrates the
convex portion 103 and the concave portion 104 so as to connect
both each other. In this embodiment, the divided beam 102 are
connected to each other by two connection pins 105, but may be
connected to each other by one connection pin or three or more
connection pins.
[0194] Here, generally, various structures are provided at the top
portion side of the U-bent portion 18 in the steam generator 1. For
this reason, it is difficult to carry and install the beam member
81 as a single member to the installation position of the existing
steam generator 1. On the contrary, since the beam member 101
includes the plurality of divided beams 102 and the divided beams
102 are connected to each other at the installation position of the
beam member 101, the beam member 101 may be easily installed.
Furthermore, the invention is not limited to the connection using
the connection pin 105, and the divided beams 102 may be connected
to each other by welding or the like.
[0195] FIG. 37 is a longitudinal sectional view illustrating
another embodiment of the quake-resistant structure of the steam
generator according to the third embodiment. Furthermore, in
another embodiment, the same sign will be given to the same
component as that of the above-described embodiment, and the
description thereof will not be repeated.
[0196] As illustrated in FIG. 37, since a beam member 108 forms a
truss structure, the beam member is different from the beam members
81 and 101 of the above-described embodiments.
[0197] That is, as illustrated in FIG. 37, the beam member 100 is
formed by handing bar members 109 through a pin. Accordingly, it is
possible to decrease the cross-sectional area perpendicular to the
extension direction of the beam member 108 while ensuring the
rigidity of the beam member 105. Thus, it is possible to obtain a
function of suppressing the vibration of the U-bent portion 18 in
the out-of-plane direction. D1 by the beam member 100 without
degrading the performance of the steam generator 1.
[0198] While the third embodiment of the invention has been
described in detail, the invention is not limited to the
embodiment, and a slight modification in design ma be also made
without departing from the technical spirit of the invention. For
example, the number of the beam members 81, 101, and 108 is not
limited to three, and may be two or four or more. Further, when the
quake resistance of the U-bent portion 18 may be ensured only by
one beam member 81, 101, or 108, the number of the beam members 81,
101, and 108 may be one.
[0199] Further, in the third embodiment, an example has been
described in which the beam members 81, 101, and 108 extending in
the out-of-plane direction D1 are provided, but the invention is
not limited thereto. For example, the second beam member may be
provided so as to extend in the in-plane direction D2 or obliquely
extend in the out-of-plane direction D1 and the in-plane direction
D2. Accordingly, the quake-resistant strength of the U-bent portion
18 may be further improved.
[0200] Furthermore, the beam members 81, 101, and 108 of the third
embodiment correspond to a configuration in which the first support
member and the second support member of the first embodiment are
included, and the outer tube support member 83 of the third
embodiment corresponds to the third support member of the first
embodiment. Further, the regulation member 91 of the third
embodiment corresponds to the regulation member of the first
embodiment, and the modified example thereof may be adopted.
REFERENCE SIGNS LIST
[0201] 1 STEAM GENERATOR [0202] 2 CYLINDER PORTION [0203] 3 TUBE
BUNDLE SHROUD [0204] 4 TUBE SHEET [0205] 5 HEAT TRANSFER TUBE
[0206] 5A HEAT TRANSFER TUBE LAYER [0207] 5U BENT PORTION [0208] 6
TUBE SUPPORT PLATE (SUPPORT PORTION) [0209] 7 CHANNEL HEAD [0210] 8
PARTITION WALL [0211] 9 STEAM-WATER SEPARATOR [0212] 10 MOISTURE
SEPARATOR [0213] 11 WATER FEEDING TUBE [0214] 12 STEAM DISCHARGE.
PORT [0215] 13 WATER FEEDING LINE [0216] 14 VIBRATION PREVENTING
MEMBER [0217] 16 HOLDING MEMBER. [0218] 17, 17a, 17c. BRIDGE [0219]
17Ta, 17Tc. BRIDGE END [0220] 17S, 17Sa SIDE SURFACE [0221] 18
U-BENT PORTION [0222] 18T TOP PORTION [0223] 20, 20a
QUAKE-RESISTANT STRUCTURE [0224] 21, 21A, 21B, 21a. ANNULAR. MEMBER
(FIRST SUPPORT MEMBER) [0225] 22, 22A, 22B, 22a. SECOND SUPPORT
MEMBER [0226] 23, 23A, 23B, 23a. THIRD SUPPORT MEMBER [0227] 24,
24A, 24B, 24a. REGULATION MEMBER [0228] 24E EXTENSION PORTION
[0229] 24Y OUTER PORTION [0230] 24E GROOVE PORTION [0231] 25
ORIFICE [0232] 26, 26c INTERMEDIATE: SUPPORT MEMBER [0233] 27
PEDESTAL [0234] 30 PARTITION PLATE [0235] 30a PARTITION PLATE
[0236] 31 PENETRATION HOLE [0237] 35 SUPPORT PORTION [0238] 35a
ANNULAR PORTION [0239] 35b TUBE BUNDLE SHROUD INNER MEMBER [0240]
35c. TUBE BUNDLE SHROUD OUTER MEMBER [0241] 35d PEDESTAL [0242] 35e
SUPPORT MEMBER [0243] 36 SUPPORT PORTION [0244] 36a TUBE BUNDLE
SHROUD OUTER MEMBER [0245] 36b PEDESTAL [0246] 37 SUPPORT PORTION
[0247] 37a TUBE BUNDLE SHROUD INNER MEMBER [0248] 37b TUBE BUNDLE
SHROUD OUTER MEMBER [0249] 37c PEDESTAL [0250] 38 BONDING MECHANISM
[0251] 39 DAMPING MECHANISM [0252] 40 DAMPING MECHANISM [0253] E
GAP [0254] 81 BEAM MEMBER [0255] 83 OUTER. TUBE SUPPORT MEMBER
[0256] 84 BAR. PORTION [0257] 85 INNER. PEDESTAL [0258] 86 OUTER.
PEDESTAL [0259] 90 MOVEMENT REGULATION PORTION [0260] 101 BEAM
MEMBER [0261] 108 BEAM MEMBER
* * * * *