JP2007147138A - Steam generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent damage of a heat transfer tube due to thermal expansion differences of structural members in a steam generator. <P>SOLUTION: The steam generator is composed by arranging a tube bank outer cylinder 32 in a shell part 31 comprising a hollow sealed shape, at a predetermined interval to an inner wall surface of the shell part 31, positioning and supporting the tube bank outer cylinder 32 with respect to the shell part 31 by a plurality of jack assemblies 34, supporting a plurality of tube support plates 35 by a stay rod 36, arranging a plurality of heat transfer tubes 37 comprising inverted U-shapes in the tube bank outer cylinder 32, and supporting middle parts of the heat transfer tubes by the tube support plates 35. The tube support plates 35 are arranged such that they can be relatively moved in a vertical direction with a predetermined interval S to the jack assemblies 34. A movable body 53 of the jack assembly 34 can absorb a load received from the tube support plate 35 by a ring spring 54. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a steam generator used as a heat exchanger in a nuclear power plan.

  For example, in a pressurized water reactor (PWR), light water is used as a reactor coolant and a neutron moderator, and high-temperature high-pressure water that does not boil throughout the core is sent to a steam generator. Steam is generated by heat exchange, and the steam is sent to a turbine generator for power generation. And this pressurized water reactor transmits the heat | fever of high temperature high pressure primary cooling water to secondary cooling water via a steam generator, and generates water vapor | steam with secondary cooling water. In this steam generator, primary cooling water flows inside a large number of thin heat transfer tubes, heat is transferred to secondary cooling water flowing outside, and steam is generated, and a turbine is rotated by the steam to generate electric power.

  In this steam generator, a tube group outer cylinder is disposed at a predetermined distance from the inner wall surface in a hollow hermetically sealed body portion, and the tube group outer cylinder is supported by a plurality of jack assemblies, and is outside the tube group. A plurality of tube support plates in which a plurality of heat transfer tubes each having an inverted U shape are disposed in the cylinder, the end portions of the heat transfer tubes are supported by the tube plates, and the intermediate portions are supported by stay rods extending from the tube plates. It is supported and constituted. In this case, the plurality of tube support plates are firmly fixed by a plurality of wedges inserted between the outer peripheral surface and each jack assembly.

  Accordingly, the primary cooling water is supplied to the plurality of heat transfer tubes through the water chamber formed at the lower portion of the trunk portion, while the secondary cooling water is supplied into the trunk portion from the water supply pipe formed at the upper portion of the trunk portion. And heat exchange is performed between the primary cooling water (hot water) flowing through the plurality of heat transfer tubes and the secondary cooling water (cold water) circulating in the body, so that the secondary cooling water absorbs heat. Thus, water vapor is generated and discharged from the upper end of the trunk.

  In addition, as such a steam generator, it describes in the following patent documents 1, 2.

Japanese Patent Publication No. 07-018522 JP-A-61-114096

  In the steam generator described above, the tube support plate that supports the intermediate portions of the plurality of heat transfer tubes is firmly fixed by a plurality of wedges inserted between each jack assembly and the outer peripheral surface of the tube support plate. Yes. By the way, the secondary cooling water is supplied from the water supply pipe formed in the upper part of the trunk part into the trunk part, descends between the trunk part and the tube group outer cylinder, and passes through the inside of the pipe group outer cylinder. When it rises, heat exchange is performed with the primary cooling water flowing through the plurality of heat transfer tubes. At this time, the inside temperature of the trunk portion is higher than the outer peripheral portion, and a difference in thermal expansion occurs between the tube group outer cylinder, the stay rod, and the tube support plate. That is, the stay rod pushes up the tube support plate due to thermal expansion, but the tube support plate cannot move upward because the outer peripheral portion is fixed to the jack assembly by the wedge. The plate is deformed into a shape in which the central portion is curved upward. Then, a large number of heat transfer tubes supported by the tube support plate in the deformed state are subjected to stress that is bent from the outside at the support position by the tube support plate, and this portion may be damaged.

  Also, when manufacturing a steam generator, a tube group outer cylinder is disposed in the body and supported by a jack assembly, and a plurality of tube support plates are supported by stay rods. After the heat transfer tubes are inserted and supported from below into the support holes, a water chamber is welded to the lower end portion of the body portion to perform heat treatment. However, at this time, the heat of the heat treatment is transmitted upward from the water chamber by the trunk part or the tube group outer cylinder, and the temperature inside the barrel part becomes higher than the inside, and the tube group outer cylinder, the stay rod, and the tube A difference in thermal expansion occurs between the support plate and the support plate. That is, the tube group outer cylinder is expanded by thermal expansion to push up the tube support plate, but the tube support plate cannot be moved upward because the center portion is fixed to the tube plate by the stay rod. The tube support plate is deformed into a shape whose central portion is curved downward. Then, as in the case described above, a large number of heat transfer tubes supported by the tube support plate in the deformed state are subjected to stress that is bent from the outside at the support position by the tube support plate, and this portion may be damaged. is there.

  This invention solves the subject mentioned above, and it aims at providing the steam generator which can prevent the damage of the heat exchanger tube by the thermal expansion difference of a structural member.

  In order to achieve the above object, a steam generator according to a first aspect of the present invention includes a body portion having a hollow hermetic shape, a tube group outer cylinder disposed in the body portion with a predetermined interval from an inner wall surface thereof, A heat transfer tube group comprising a plurality of heat transfer tubes disposed in an outer tube of the tube group and having an inverted U shape; and a tube plate fixed to a lower portion of the body portion and supporting end portions of the plurality of heat transfer tubes; A plurality of tube support plates that are supported by stay rods extending upward from the tube plate and support intermediate portions of the plurality of heat transfer tubes; and water is supplied into the body portion to flow through the plurality of heat transfer tubes. In a steam generator comprising a water supply path for exchanging heat with hot water, and an air / water separator provided in the upper part of the body part for separating the water supply into steam and hot water, A plurality of support connection members for positioning and supporting the tube group outer cylinder in the circumferential direction between the body portion and the tube group outer cylinder. A load absorbing means for absorbing a load received by the support connection member from the tube support plate, while the tube support plate is disposed so as to be relatively movable in the vertical direction with a predetermined gap from the support connection member. Is provided.

  In the steam generator according to a second aspect of the present invention, the gap between the tube support plate and the support connection member is set in a range of 1 mm or more.

  In the steam generator according to a third aspect of the present invention, the load absorbing means includes a movable body supported by the support connecting member so as to be able to approach and separate from the tube support plate, and the movable body approaches the tube support plate. And an urging member for urging and supporting in the direction of the movement.

  The steam generator according to a fourth aspect of the invention is characterized in that the support connecting member or the moving body is provided with a damping means for attenuating a load received from the tube support plate.

  The steam generator according to the invention of claim 5 is characterized in that the support connection member is provided with thermal expansion moving means for moving the moving body in a direction away from the tube support plate by thermal expansion.

  The steam generator according to a sixth aspect of the present invention is characterized in that the load absorbing means includes an elastic body mounted on the surface of the support connection member so as to face the tube support plate.

  According to the steam generator of the first aspect of the present invention, the tube group outer cylinder is disposed at a predetermined distance from the inner wall surface within the hollow hermetic body, and the tube group outer cylinder has an inverted U-shape. A heat transfer tube group consisting of a plurality of heat transfer tubes is arranged, and the intermediate portion of the plurality of heat transfer tubes is supported by a tube support plate supported by a stay rod extending upward from the tube plate. On the other hand, a plurality of support connection members for positioning and supporting the tube group outer cylinder are disposed in the circumferential direction between the trunk portion and the tube group outer cylinder, and the tube support plate is vertically arranged with a predetermined gap from the support connection member. While being disposed so as to be relatively movable, a load absorbing means for absorbing a load received from the tube support plate is provided on the support connection member. Therefore, for example, even if a difference in thermal expansion occurs between the trunk portion and the tube group outer cylinder and the stay rod and the tube support plate, the pipe support plate and the support connecting member, that is, the tube group outer cylinder, have a predetermined gap. Therefore, the pipe support plate is not deformed so as to be curved, and each heat transfer tube supported by the tube support plate is not subjected to external stress at the support position by the tube support plate. It does not act, and damage to the heat transfer tube can be prevented. In addition, even if the pipe support plate moves to the outer peripheral side during an earthquake or when a steam generator is transported, the pipe support plate will absorb the collision load (dynamic load) by the load absorbing means. Sufficient safety can be ensured.

  According to the steam generator of the second aspect of the present invention, since the gap between the tube support plate and the support connection member is set to a range of 1 mm or more, the difference in thermal expansion of the constituent members is reliably absorbed and the heat transfer tube In addition to preventing damage, the dynamic load of the tube support plate can be appropriately absorbed by the load absorbing means when an earthquake occurs or when a steam generator is transported, thereby improving safety.

  According to the steam generator of the invention of claim 3, the load absorbing means includes a moving body supported by the support connection member so as to be able to move away from the tube support plate, and a direction in which the moving body approaches the tube support plate. Since the load absorbing means is constituted by the movable body and the urging member, the dynamic load of the tube support plate can be reliably absorbed with a simple configuration.

  According to the steam generator of the fourth aspect of the present invention, the damping means for attenuating the load received from the tube support plate is provided on the support connecting member or the moving body. Therefore, the dynamic load on the tube support plate is attenuated by the attenuation unit. Therefore, the load can be absorbed by the load absorbing means, and the safety can be further improved.

  According to the steam generator of the invention of claim 5, since the thermal expansion moving means for moving the moving body in the direction away from the tube support plate by thermal expansion is provided in the support connection member, at the time of transporting the steam generator, While the tube support plate contacts the moving body, vibration of the tube support plate can be prevented. On the other hand, when the steam generator is used, the moving body is separated from the tube support plate by the thermal expansion moving means. The difference in thermal expansion of the constituent members can be absorbed.

  According to the steam generator of the sixth aspect of the invention, since the elastic body mounted on the surface of the support connecting member so as to face the tube support plate is provided as the load absorbing means, the load absorbing means is constituted by this elastic body. Thus, the dynamic load of the tube support plate can be reliably absorbed with a simple configuration.

  Exemplary embodiments of a steam generator according to the present invention will be described below in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments.

  1 is a cross-sectional view of a main part showing a support structure of a tube support plate in a steam generator according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view taken along II-II in FIG. 1, and FIG. FIG. 4 is a schematic configuration diagram illustrating a steam generator according to the first embodiment. FIG. 4 is a schematic configuration diagram of a power generation facility having a pressurized water reactor to which a steam generator is applied.

  The nuclear reactor of Example 1 uses light water as a reactor coolant and a neutron moderator, and produces high-temperature and high-pressure water that does not boil over the entire core, and sends this high-temperature and high-pressure water to a steam generator to generate steam by heat exchange. This is a pressurized water reactor (PWR) that generates electricity by sending this steam to a turbine generator.

  That is, in the power generation facility having this pressurized water reactor, as shown in FIG. 3, a pressurized water reactor 12 and a steam generator 13 are stored in the reactor containment vessel 11, and this pressurized water reactor is stored. 12 and the steam generator 13 are connected via cooling water pipes 14 and 15, a pressurizer 16 is provided in the cooling water pipe 14, and a cooling water pump 17 is provided in the cooling water pipe 15. In this case, light water is used as the moderator and the primary cooling water, and the primary cooling system applies a high pressure of about 150 to 160 atmospheres by the pressurizer 16 in order to suppress boiling of the primary cooling water in the core. Therefore, in the pressurized water reactor 12, light water is heated as the primary cooling water by the low-concentration uranium or MOX as fuel, and steam is generated through the cooling water pipe 14 while the high temperature light water is maintained at a predetermined high pressure by the pressurizer 16. Sent to the vessel 13. In the steam generator 13, heat exchange is performed between high-pressure and high-temperature light water and water as secondary cooling water, and the cooled light water is returned to the pressurized water reactor 12 through the cooling water pipe 15.

  The steam generator 13 is connected to a turbine 18 and a condenser 19 provided outside the reactor containment vessel 11 through cooling water pipes 20 and 21, and a water supply pump 22 is provided in the cooling water pipe 21. ing. Further, a generator 23 is connected to the turbine 18, and a supply pipe 24 and a water distribution pipe 25 that supply and discharge cooling water (for example, seawater) are connected to the condenser 19. Therefore, the steam generated by exchanging heat with high-pressure and high-temperature light water in the steam generator 13 is sent to the turbine 18 through the cooling water pipe 20, and the turbine 18 is driven by this steam to generate power by the generator 23. I do. The steam that has driven the turbine 18 is cooled by the condenser 19 and then returned to the steam generator 13 through the cooling water pipe 21.

  In the steam generator 13 in the power generation facility having a pressurized water reactor, as shown in FIG. 4, the trunk portion 31 has a sealed hollow cylindrical shape, and the lower portion has a slightly smaller diameter with respect to the upper portion. A tube group outer cylinder 32 having a cylindrical shape with a predetermined distance from the inner wall surface of the trunk portion 31 is disposed in the trunk portion 31, and a lower end portion extends to the vicinity of the tube plate 33. The tube group outer cylinder 32 is positioned and supported by the body portion 31 by a plurality of jack assemblies (support connection members) 34 at a position spaced apart by a predetermined interval in the longitudinal direction and at a position spaced apart by a predetermined interval in the circumferential direction. Has been.

  A plurality of tube support plates 35 are disposed in the tube group outer cylinder 32 at a height corresponding to the jack assembly 34, and a plurality of stay rods 36 extending upward from the tube plate 33. Is supported by. A heat transfer tube group 38 including a plurality of heat transfer tubes 37 having an inverted U shape is disposed in the tube group outer cylinder 32, and an end portion of each heat transfer tube 37 is expanded to the tube plate 33. The intermediate portion is supported by a plurality of tube support plates 35. In this case, a large number of through holes (not shown) are formed in the tube support plate 35, and each heat transfer tube 37 passes through the through holes in a non-contact state.

  A water chamber 39 is fixed to a lower end portion of the body portion 31, and the inside is partitioned by a partition wall 40 by an entrance chamber 41 and an exit chamber 42, and an inlet nozzle 43 and an outlet nozzle 44 are formed, and each heat transfer tube 37 is formed. One end portion of the air passage communicates with the entrance chamber 41, and the other end portion communicates with the exit chamber 42. The inlet nozzle 43 is connected to the cooling water pipe 14 described above, while the outlet nozzle 44 is connected to the cooling water pipe 15.

  An upper part of the body 31 is provided with an air / water separator 45 that separates the feed water into steam and hot water, and a moisture separator 46 that removes the moisture from the separated steam to bring it closer to dry steam. ing. Further, in the body portion 31, a water supply pipe 47 for supplying secondary cooling water is inserted into the body portion 31 between the heat transfer tube group 38 and the steam / water separator 45, while in the ceiling portion. A steam outlet 48 is formed. And in the trunk | drum 31, the secondary cooling water supplied in this trunk | drum 31 from the water supply pipe 47 flows down between the trunk | drum 31 and the pipe group outer cylinder 32, and is upper in the pipe plate 33. A water supply passage 49 is provided for exchanging heat with hot water (primary cooling water) flowing through the heat transfer tubes 37 when circulating in the heat transfer tube group 38. The cooling water pipe 21 is connected to the water supply pipe 47, while the cooling water pipe 20 is connected to the steam outlet 48.

  Therefore, the primary cooling water heated in the pressurized water reactor 12 is sent to the entrance chamber 41 of the steam generator 13 through the cooling water pipe 14, circulates through the numerous heat transfer tubes 47, and reaches the exit chamber 42. On the other hand, the secondary cooling water cooled by the condenser 19 is sent to the water supply pipe 47 of the steam generator 13 through the cooling water pipe 21 and flows through the heat transfer pipe 47 through the water supply path 49 in the trunk portion 31. Exchange heat with water (primary cooling water). In other words, heat exchange is performed between the high-pressure and high-temperature primary and secondary cooling water in the body portion 31, and the cooled primary cooling water passes from the outlet chamber 42 through the cooling water pipe 15 to the pressurized water reactor 12. Returned to On the other hand, the secondary cooling water subjected to heat exchange with the high-pressure and high-temperature primary cooling water rises in the body 31 and is separated into steam and hot water by the steam-water separator 45, and this is separated by the moisture separator 46. After the moisture of the steam is removed, the steam is sent to the turbine 18 through the cooling water pipe 20.

  In the steam generator 13 configured as described above, in this embodiment, the pipe support plate 35 is disposed so as to be movable relative to the jack assembly 34 in a vertical direction with a predetermined gap S. Load absorbing means for absorbing the load received from the tube support plate 35 is provided.

  That is, as shown in FIGS. 1 and 2, the jack assembly 34 includes a jacking block 51 fixed to the tube group outer cylinder 32, and extends from the jacking block 51 toward the inner wall surface of the trunk portion 31. A plurality of (two in this embodiment) jacking bolts 52. The jacking block 51 has a hollow shape and has an opening 51a on the tube support plate 35 side. The moving body 53 moves along a direction in which the moving body 53 approaches and separates from the tube support plate 35. The movable body 53 is urged and supported in a direction approaching the tube support plate 35 by a ring spring 54 as an urging member. In this embodiment, a load absorbing means is constituted by the moving body 53 and the ring spring 54.

  The movable body 53 is integrally formed with flange-like stoppers 53b and 53c before and after the main body 53a in the moving direction, and the stoppers 53b and 53c are engaged with the edge 51b of the opening 51a of the jacking block 51. The amount of movement is regulated by being stopped. The ring spring 54 is a metal ring whose cross section has a letter C shape and is overlapped in multiple stages.

  A predetermined gap S is secured between the outer peripheral surface of the tube support plate 35 and the end surface of the moving body 53 in the jack assembly 34, and the tube support plate 35 and the moving body 53 have a body portion 31. Relative movement is possible with respect to the vertical direction (vertical direction) and the radial direction. In this case, the gap S between the tube support plate 35 and the moving body 53 is preferably set to a range of 1 mm or more, and is practically 1 to 3 mm, and 1 mm is optimal.

  Accordingly, when a difference in thermal expansion occurs between the trunk portion 31 and the tube group outer cylinder 32, the stay rod 36, and the tube support plate 35 during operation or manufacturing of the steam generator 13, the tube support plate 35 moves. The body 53 is displaced in the vertical direction of the body portion 31, but since the gap S is secured between them, the tube support plate 35 is not restrained by the moving body 53 and is not deformed to be curved. . Therefore, each heat transfer tube 37 supported by the tube support plate 35 is not subjected to external stress at the position where the tube support plate 35 is supported, and the heat transfer tube 37 is prevented from being damaged.

  In addition, when the tube support plate 35 moves to the outer peripheral side when an earthquake or a steam generator is transported, the outer peripheral surface of the tube support plate 35 collides with the moving body 53, but the tube support plate 35 moves. When colliding with the body 53, the moving body 53 moves against the urging force of the ring spring 54, so that the collision load is absorbed.

  As described above, in the steam generator according to the first embodiment, the tube group outer cylinder 32 is disposed at a predetermined interval from the inner wall surface in the hollow portion 31 having a hollow hermetic shape, and the plurality of jack assemblies 34 serve as the barrel. The tube group outer cylinder 32 is positioned and supported with respect to the portion 31, the plurality of tube support plates 35 are supported by the stay rods 36, and the plurality of heat transfer tubes 37 having an inverted U shape are arranged in the tube group outer cylinder 32. The intermediate portion is supported by the tube support plate 35, and the tube support plate 35 is disposed so as to be relatively movable with the jack assembly 34 in a vertical direction with a predetermined gap S. The movable body 53 can absorb the load received from the tube support plate 35 by the ring spring 54.

  Therefore, even if a difference in thermal expansion occurs between the tube group outer cylinder 32 and the tube support plate 35, the tube support plate 35 and the moving body 53 of the jack assembly 34 are relatively moved in the vertical direction with a predetermined gap S. Therefore, the tube support plate 35 is not deformed so as to be bent, and each heat transfer tube 37 supported by the tube support plate 35 is not subjected to external stress at a position where the tube support plate 35 supports. Therefore, damage to the heat transfer tube 37 can be prevented. Further, when the pipe support plate 35 moves in the radial direction when an earthquake occurs or when the steam generator 13 is transported, the pipe support plate 35 comes into contact with the moving body 53 supported by the ring spring 54. The collision load is absorbed, and sufficient safety can be ensured. Furthermore, the jack for connecting the tube support plate 35 and the jack assembly 34 is not required, and the structure can be simplified.

  Further, the gap between the tube support plate 35 and the moving body 53 is set to a range of 1 mm or more, preferably 1 mm. Therefore, it is possible to reliably absorb the difference in thermal expansion of the constituent members and prevent the heat transfer tube 37 from being damaged, and to appropriately handle the dynamic load of the tube support plate 35 when an earthquake occurs or when the steam generator is transported. Absorption can improve safety.

  In this embodiment, the load absorbing means is supported in the jack block 51 of the jack assembly so as to be able to approach and separate from the tube support plate 35, and the movable body 53 is attached to the tube support plate 35. It is constituted by a ring spring as a biasing member that biases and supports in the approaching direction. Therefore, by configuring the load absorbing means from the movable body 53 and the ring spring 54, the dynamic load of the tube support plate 35 can be reliably absorbed with a simple configuration.

  FIG. 5 is a cross-sectional view of the main part showing the support structure of the tube support plate in the steam generator according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the steam generator of the present embodiment, as shown in FIG. 5, the jack assembly 34 includes a jacking block 51 fixed to the tube group outer cylinder 32, and an inner wall surface of the trunk portion 31 from the jacking block 51. It comprises a plurality of jacking bolts 52 extending toward the end. In the jacking block 51, the moving body 53 is movable along a direction in which the moving body 53 approaches and separates from the tube support plate 35, and the moving body 53 is connected to the tube by a conical helical spring 55 as an urging member. It is urged and supported in a direction approaching the support plate 35. In this embodiment, the load absorbing means is constituted by the movable body 53 and the conical helical spring 55.

  A predetermined gap S is secured between the outer peripheral surface of the tube support plate 35 and the end surface of the moving body 53 in the jack assembly 34, and the tube support plate 35 and the moving body 53 have a body portion 31. Relative movement is possible with respect to the vertical direction (vertical direction) and the radial direction.

  Therefore, when a difference in thermal expansion occurs between the trunk portion 31 and the tube group outer cylinder 32, the stay rod 36, and the tube support plate 35 during operation or manufacture of the steam generator, the tube support plate 35 and the movable body 53 is shifted in the vertical direction of the body portion 31, but since the gap S is secured between them, the tube support plate 35 is not restrained by the moving body 53 and is not deformed to be curved. Therefore, each heat transfer tube 37 supported by the tube support plate 35 is not subjected to external stress at the position where the tube support plate 35 is supported, and the heat transfer tube 37 is prevented from being damaged.

  Further, when the tube support plate 35 moves to the outer peripheral side at the time of an earthquake or when a steam generator is transported, the outer peripheral surface of the tube support plate 35 collides with the moving body 53, but the tube support plate 35 is moved to the moving body. When colliding with 53, the moving body 53 moves against the urging force of the conical helical spring 55, so that the collision load is absorbed.

  As described above, in the steam generator according to the second embodiment, the pipe support plate 35 is disposed so as to be relatively movable in the vertical direction with a predetermined gap S from the moving body 53 supported by the jack assembly 34. The load received from the tube support plate 35 can be absorbed by urging and supporting the moving body 53 with the conical helical spring 55.

  Therefore, even if a difference in thermal expansion occurs between the tube group outer cylinder 32 and the tube support plate 35, the tube support plate 35 and the moving body 53 of the jack assembly 34 are relatively moved in the vertical direction with a predetermined gap S. Since this is possible, the tube support plate 35 is not deformed so as to be curved, and damage to each heat transfer tube 37 supported by the tube support plate 35 can be prevented. Further, even when the tube support plate 35 moves in the radial direction when an earthquake occurs or when the steam generator is transported, the tube support plate 35 contacts the moving body 53 that is urged and supported by the conical helical spring 55. Then, the collision load is absorbed, and sufficient safety can be ensured. In this case, by using the conical helical spring 55 as the urging member of the moving body 53, since the wear on the contact surface of the spring is small, the moving body 53 can be urged and supported stably.

  FIG. 6 is a cross-sectional view of the main part showing the support structure of the tube support plate in the steam generator according to Embodiment 3 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the steam generator of the present embodiment, as shown in FIG. 6, the jack assembly 34 includes a jacking block 51 fixed to the tube group outer cylinder 32, and an inner wall surface of the trunk portion 31 from the jacking block 51. It comprises a plurality of jacking bolts 52 extending toward the end. The moving body 53 is movable in the jacking block 51 along a direction in which the moving body 53 approaches and separates from the tube support plate 35, and the plate 53 as a biasing member causes the moving body 53 to move to the tube support plate. Biasing is supported in a direction approaching 35. In the present embodiment, the load absorbing means is constituted by the movable body 53 and the leaf spring 56.

  A predetermined gap S is secured between the outer peripheral surface of the tube support plate 35 and the end surface of the moving body 53 in the jack assembly 34, and the tube support plate 35 and the moving body 53 have a body portion 31. Relative movement is possible with respect to the vertical direction (vertical direction) and the radial direction.

  Therefore, when a difference in thermal expansion occurs between the trunk portion 31 and the tube group outer cylinder 32, the stay rod 36, and the tube support plate 35 during operation or manufacture of the steam generator, the tube support plate 35 and the movable body 53 is shifted in the vertical direction of the body portion 31, but since the gap S is secured between them, the tube support plate 35 is not restrained by the moving body 53 and is not deformed to be curved. Therefore, each heat transfer tube 37 supported by the tube support plate 35 is not subjected to external stress at the position where the tube support plate 35 is supported, and the heat transfer tube 37 is prevented from being damaged.

  Further, when the tube support plate 35 moves to the outer peripheral side at the time of an earthquake or when a steam generator is transported, the outer peripheral surface of the tube support plate 35 collides with the moving body 53, but the tube support plate 35 is moved to the moving body. When the vehicle 53 collides, the moving body 53 moves against the urging force of the leaf spring 56, so that the collision load is absorbed.

  As described above, in the steam generator according to the third embodiment, the pipe support plate 35 is disposed so as to be relatively movable in the vertical direction with a predetermined gap S from the moving body 53 supported by the jack assembly 34. By supporting the moving body 53 by a leaf spring 56, the load received from the tube support plate 35 can be absorbed.

  Therefore, even if a difference in thermal expansion occurs between the tube group outer cylinder 32 and the tube support plate 35, the tube support plate 35 and the moving body 53 of the jack assembly 34 are relatively moved in the vertical direction with a predetermined gap S. Since this is possible, the tube support plate 35 is not deformed so as to be curved, and damage to each heat transfer tube 37 supported by the tube support plate 35 can be prevented. Even when the pipe support plate 35 moves in the radial direction at the time of an earthquake or when a steam generator is transported, the pipe support plate 35 comes into contact with the moving body 53 supported by the leaf spring 56. The collision load is absorbed, and sufficient safety can be ensured. In this case, since the plate spring 56 is used as the biasing member of the moving body 53, since the wear on the contact surface of the spring is small, the moving body 53 can be stably biased and supported.

  In the first to third embodiments described above, the biasing member of the present invention is the ring spring 54, the conical helical spring 55, and the leaf spring 56, but is not limited thereto, and a coil spring is used. May be.

  FIG. 7: is principal part sectional drawing showing the support structure of the pipe support plate in the steam generator which concerns on Example 4 of this invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the steam generator of the present embodiment, as shown in FIG. 7, the jack assembly 34 includes a jacking block 51 fixed to the tube group outer cylinder 32, and an inner wall surface of the trunk portion 31 from the jacking block 51. It comprises a plurality of jacking bolts 52 extending toward the end. A plate spring 61 as a load absorbing means and an elastic body is mounted on the surface of the jacking block 51 so as to be elastically deformable by a fixing screw 62, and between the outer peripheral surface of the tube support plate 35 and the plate spring 61. A predetermined gap S is secured between them, and the tube support plate 35 and the leaf spring 61 can be moved relative to the vertical direction (vertical direction) and the radial direction of the body portion 31. .

  Therefore, when a difference in thermal expansion occurs between the trunk portion 31 and the tube group outer cylinder 32, the stay rod 36, and the tube support plate 35 during operation or production of the steam generator, the tube support plate 35 and the leaf spring. 61 is displaced in the vertical direction of the body portion 31, but since the gap S is secured between them, the tube support plate 35 is not restrained by the leaf spring 61 and is not deformed to be curved. Therefore, each heat transfer tube 37 supported by the tube support plate 35 is not subjected to external stress at the position where the tube support plate 35 is supported, and the heat transfer tube 37 is prevented from being damaged.

  Further, when the tube support plate 35 moves to the outer peripheral side when an earthquake occurs or when the steam generator is transported, the outer peripheral surface of the tube support plate 35 collides with the leaf spring 61. However, the tube support plate 35 is moved to the leaf spring. When it collides with 61, the impact load is absorbed by the elastic force of the leaf spring 61 itself.

  As described above, in the steam generator according to the fourth embodiment, the pipe support plate 35 is disposed so as to be relatively movable in the vertical direction with a predetermined gap S from the leaf spring 61 attached to the jack assembly 34. The load received from the tube support plate 35 by the leaf spring 61 can be absorbed.

  Therefore, even if a thermal expansion difference occurs between the tube group outer cylinder 32 and the tube support plate 35, the tube support plate 35 and the leaf spring 61 (jack assembly 34) are relatively perpendicular to each other with a predetermined gap S. Since the tube support plate 35 is movable, the tube support plate 35 is not deformed so as to be bent, and damage to the heat transfer tubes 37 supported by the tube support plate 35 can be prevented. Further, even when the tube support plate 35 moves in the radial direction at the time of an earthquake or when a steam generator is transported, the tube support plate 35 contacts the leaf spring 61 and the collision load is absorbed. Sufficient safety can be ensured. In this case, the structure can be further simplified by using the load absorbing means and the leaf spring 61 as an elastic body.

  FIG. 8: is principal part sectional drawing showing the support structure of the pipe support plate in the steam generator which concerns on Example 5 of this invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the steam generator of the present embodiment, as shown in FIG. 8, the jack assembly 34 includes a jacking block 51 fixed to the tube group outer cylinder 32, and an inner wall surface of the trunk portion 31 from the jacking block 51. It comprises a plurality of jacking bolts 52 extending toward the end. A plate spring 61 as a load absorbing means and an elastic body is mounted on the surface of the jacking block 51 so as to be elastically deformable by a fixing screw 62, and between the outer peripheral surface of the tube support plate 35 and the plate spring 61. A predetermined gap S is secured between them, and the tube support plate 35 and the leaf spring 61 can be moved relative to the vertical direction (vertical direction) and the radial direction of the body portion 31. .

  In addition, an uneven portion 61a is formed on the back surface of the leaf spring 61, the inside is filled with a working fluid (for example, a fluid similar to water or secondary cooling water) 63, and a plurality of through holes 64 are formed. . In the present embodiment, the damping means is constituted by the working fluid filled in the leaf spring 61 and the through hole 64.

  Therefore, when a difference in thermal expansion occurs between the trunk portion 31 and the tube group outer cylinder 32, the stay rod 36, and the tube support plate 35 during operation or production of the steam generator, the tube support plate 35 and the leaf spring. 61 is displaced in the vertical direction of the body portion 31, but since the gap S is secured between them, the tube support plate 35 is not restrained by the leaf spring 61 and is not deformed to be curved. Therefore, each heat transfer tube 37 supported by the tube support plate 35 is not subjected to external stress at the position where the tube support plate 35 is supported, and the heat transfer tube 37 is prevented from being damaged.

  Further, when the tube support plate 35 moves to the outer peripheral side when an earthquake occurs or when the steam generator is transported, the outer peripheral surface of the tube support plate 35 collides with the leaf spring 61. However, the tube support plate 35 is moved to the leaf spring. When it collides with 61, the collision load is absorbed by the elastic force of the leaf spring 61 itself, and the collision load is attenuated by the working fluid 63 filled therein.

  As described above, in the steam generator according to the fifth embodiment, the tube support plate 35 is disposed so as to be relatively movable in the vertical direction with a predetermined gap S from the leaf spring 61 attached to the jack assembly 34. By filling the leaf spring 61 with a working fluid, the load received from the tube support plate 35 can be attenuated and absorbed.

  Therefore, even if a thermal expansion difference occurs between the tube group outer cylinder 32 and the tube support plate 35, the tube support plate 35 and the leaf spring 61 (jack assembly 34) are relatively perpendicular to each other with a predetermined gap S. Since the tube support plate 35 is movable, the tube support plate 35 is not deformed so as to be bent, and damage to the heat transfer tubes 37 supported by the tube support plate 35 can be prevented. Further, even when the tube support plate 35 moves in the radial direction when an earthquake occurs or when the steam generator is transported, the tube support plate 35 contacts the leaf spring 61 and the collision load is attenuated and absorbed. Therefore, sufficient safety can be ensured. In this case, the deformation amount of the leaf spring 61, that is, the shock absorption amount can be adjusted by the shape of the uneven portion 61a formed on the back surface of the leaf spring 61.

  FIG. 9 is a cross-sectional view of the main part showing the support structure of the tube support plate in the steam generator according to Embodiment 6 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the steam generator of the present embodiment, as shown in FIG. 9, the jack assembly 34 includes a jacking block 71 fixed to the tube group outer cylinder 32, and an inner wall surface of the trunk portion 31 from the jacking block 71. And a plurality of jacking bolts 72 extending toward the front. The jacking block 71 is formed with an opening 71a so that the piston 73 is supported movably along the direction of approaching and separating from the tube support plate 35, and a coil spring 74 as an urging member. Thus, the piston 73 is biased and supported in the direction approaching the tube support plate 35. Further, the opening 71 a of the jacking block 71 is filled with a working fluid 75 and sealed with an O-ring 76, and a plurality of through holes (orifices) 77 are formed. In this embodiment, a load absorbing means is constituted by the piston 73 and the coil spring 74, and a damping means is constituted by the working fluid 75 and the through hole 77 filled in the jacking block 71.

  The piston 73 is movably supported in the jacking block 71, but its protruding position is regulated by a regulating member (not shown), and the piston 73 on the outer peripheral surface of the tube support plate 35 and the jack assembly 34. A predetermined gap S is ensured between the end surface and the tube support plate 35 and the piston 73 can be moved relative to the vertical direction (vertical direction) and the radial direction of the body portion 31. .

  Therefore, when a difference in thermal expansion occurs between the trunk portion 31 and the tube group outer cylinder 32, the stay rod 36, and the tube support plate 35 during operation or production of the steam generator, the tube support plate 35 and the piston 73 are generated. However, since the gap S is secured between them, the pipe support plate 35 is not restrained by the piston 73 and does not deform so as to bend. Therefore, each heat transfer tube 37 supported by the tube support plate 35 is not subjected to external stress at the position where the tube support plate 35 is supported, and the heat transfer tube 37 is prevented from being damaged.

  Further, when the tube support plate 35 moves to the outer peripheral side during an earthquake or when a steam generator is transported, the outer peripheral surface of the tube support plate 35 collides with the piston 73, but the tube support plate 35 contacts the piston 73. When the collision occurs, the piston 73 moves against the urging force of the coil spring 74, so that the collision load is absorbed and the collision load is attenuated by the working fluid 75 filled therein.

  As described above, in the steam generator according to the sixth embodiment, the pipe support plate 35 is disposed so as to be relatively movable in the vertical direction with a predetermined gap S from the piston 73 supported by the jack assembly 34. The load received from the tube support plate 35 can be absorbed by biasing and supporting 73 with the coil spring 74, and the load received from the tube support plate 35 can be attenuated by the working fluid 75 filled in the jacking block 71. Yes.

  Therefore, even if a difference in thermal expansion occurs between the tube group outer cylinder 32 and the tube support plate 35, the tube support plate 35 and the piston 73 of the jack assembly 34 can be relatively moved in the vertical direction with a predetermined gap S. Therefore, the tube support plate 35 is not deformed so as to be curved, and damage to each heat transfer tube 37 supported by the tube support plate 35 can be prevented. Even when the pipe support plate 35 moves in the radial direction at the time of an earthquake or when a steam generator is transported, the pipe support plate 35 comes into contact with the piston 73 biased and supported by the coil spring 74. The collision load is attenuated and absorbed, and sufficient safety can be ensured. In this case, it is not necessary to secure a large urging force on the coil spring 74 by providing a damper function that attenuates the impact force of the piston 73 by the working fluid 75 filled in the jacking block 71, thereby reducing the size of the device. This can contribute to cost reduction.

  FIG. 10: is principal part sectional drawing showing the support structure of the pipe support plate in the steam generator concerning Example 7 of this invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the steam generator of the present embodiment, as shown in FIG. 10, the jack assembly 34 includes a jacking block 71 fixed to the tube group outer cylinder 32, and the jacking block 71 to the inner wall surface of the trunk portion 31. And a plurality of jacking bolts 72 extending toward the front. The piston 78 is supported by the opening 71a of the jacking block 71 so as to be movable along a direction in which the piston 78 approaches and separates from the tube support plate 35, and the piston 78 is supported by a coil spring 74 as an urging member. Is urged and supported in a direction approaching the tube support plate 35. Furthermore, the working fluid 75 is filled in the opening 71 a of the jacking block 71 and circulates to the outside through a gap between the opening 71 a of the jacking block 71 and the piston 78. In this embodiment, the piston 78 and the coil spring 74 constitute a load absorbing means, and the working fluid 75 filled in the jacking block 71 and the outer peripheral gap (orifice) of the piston 78 constitute the damping means.

  The piston 78 is movably supported in the jacking block 71, but its protruding position is regulated by a regulating member (not shown), and the piston 78 in the jack assembly 34 and the outer peripheral surface of the tube support plate 35 are regulated. A predetermined gap S is ensured between the end face and the tube support plate 35 and the piston 78 can be moved relative to the vertical direction (vertical direction) and the radial direction of the body portion 31. .

  Therefore, when a difference in thermal expansion occurs between the trunk portion 31 and the tube group outer cylinder 32, the stay rod 36, and the tube support plate 35 during operation or manufacture of the steam generator, the tube support plate 35 and the piston 78 are generated. However, since the gap S is secured between them, the pipe support plate 35 is not restrained by the piston 78 and does not deform so as to be bent. Therefore, each heat transfer tube 37 supported by the tube support plate 35 is not subjected to external stress at the position where the tube support plate 35 is supported, and the heat transfer tube 37 is prevented from being damaged.

  Further, when the tube support plate 35 moves to the outer peripheral side during an earthquake or when a steam generator is transported, the outer peripheral surface of the tube support plate 35 collides with the piston 78. When the collision occurs, the piston 78 moves against the urging force of the coil spring 74, so that the collision load is absorbed and the collision load is attenuated by the working fluid 75 filled therein.

  As described above, in the steam generator according to the seventh embodiment, the pipe support plate 35 is disposed so as to be relatively movable in the vertical direction with a predetermined gap S from the piston 78 supported by the jack assembly 34. The load received from the tube support plate 35 can be absorbed by biasing and supporting 78 with the coil spring 74, and the load received from the tube support plate 35 can be attenuated by the working fluid 75 filled in the jacking block 71. Yes.

  Therefore, even if a difference in thermal expansion occurs between the tube group outer cylinder 32 and the tube support plate 35, the tube support plate 35 and the piston 78 of the jack assembly 34 can be relatively moved in the vertical direction with a predetermined gap S. Therefore, the tube support plate 35 is not deformed so as to be curved, and damage to each heat transfer tube 37 supported by the tube support plate 35 can be prevented. Even when the pipe support plate 35 moves in the radial direction at the time of an earthquake or when a steam generator is transported, the pipe support plate 35 comes into contact with the piston 78 urged and supported by the coil spring 74. The collision load is attenuated and absorbed, and sufficient safety can be ensured. In this case, it is not necessary to secure a large urging force on the coil spring 74 by providing a damper function for attenuating the impact force of the piston 78 by the working fluid 75 filled in the jacking block 71. This can contribute to cost reduction.

  FIG. 11: is principal part sectional drawing showing the support structure of the pipe support plate in the steam generator which concerns on Example 8 of this invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the steam generator of the present embodiment, as shown in FIG. 11, the jack assembly 34 includes a jacking block 71 fixed to the tube group outer cylinder 32, and the jacking block 71 to the inner wall surface of the trunk portion 31. And a plurality of jacking bolts 72 extending toward the front. The piston 79 is supported in the opening 71a of the jacking block 71 so as to be movable along a direction in which the piston 79 approaches and separates from the tube support plate 35, and the piston 79 is supported by a coil spring 74 as an urging member. Is urged and supported in a direction approaching the tube support plate 35. Further, the opening 71a of the jacking block 71 is filled with the working fluid 75 and circulates to the outside through a plurality of grooves 80a, 80b, and 80c having different lengths formed on the outer peripheral surface of the piston 79. . In this embodiment, a load absorbing means is constituted by the piston 79 and the coil spring 74, and the damping means is constituted by the working fluid 75 filled in the jacking block 71 and grooves 80a, 80b, 80c (orifices) formed in the piston 79. Is configured.

  The piston 79 is movably supported in the jacking block 71, but its protruding position is regulated by a regulating member (not shown), and the piston 79 on the outer peripheral surface of the tube support plate 35 and the jack assembly 34 is fixed. A predetermined gap S is ensured between the end surface and the tube support plate 35 and the piston 79 can be moved relative to the vertical direction (vertical direction) and the radial direction of the body portion 31. .

  Therefore, when a difference in thermal expansion occurs between the trunk portion 31 and the tube group outer cylinder 32, the stay rod 36, and the tube support plate 35 during operation or manufacturing of the steam generator, the tube support plate 35 and the piston 79 are generated. However, since the gap S is secured between them, the pipe support plate 35 is not restrained by the piston 79 and does not deform so as to be bent. Therefore, each heat transfer tube 37 supported by the tube support plate 35 is not subjected to external stress at the position where the tube support plate 35 is supported, and the heat transfer tube 37 is prevented from being damaged.

  Further, when the tube support plate 35 moves to the outer peripheral side, for example, when an earthquake occurs or when a steam generator is transported, the outer peripheral surface of the tube support plate 35 collides with the piston 79. When the collision occurs, the piston 79 moves against the urging force of the coil spring 74, so that the collision load is absorbed and the collision load is attenuated by the working fluid 75 filled therein. At this time, before the tube support plate 35 collides with the piston 79, the inside of the jacking block 71 communicates with the outside through all the grooves 80a, 80b, 80c, but the tube support plate 35 collides with the piston 79. Thereafter, the piston 79 moves into the opening 71a and the number of grooves 80a, 80b, 80c communicating the inside and the outside of the jacking block 71 is reduced. Therefore, the discharge amount of the working fluid 75 filled in the jacking block 71 to the outside decreases, and the damping load also decreases.

  As described above, in the steam generator according to the eighth embodiment, the pipe support plate 35 is disposed so as to be relatively movable in the vertical direction with a predetermined gap S from the piston 79 supported by the jack assembly 34. 79 is biased and supported by a coil spring 74 so that the load received from the tube support plate 35 can be absorbed, and the load received from the tube support plate 35 by the working fluid 75 filled in the jacking block 71 can be attenuated. Yes.

  Therefore, even if a difference in thermal expansion occurs between the tube group outer cylinder 32 and the tube support plate 35, the tube support plate 35 and the piston 79 of the jack assembly 34 can be relatively moved in the vertical direction with a predetermined gap S. Therefore, the tube support plate 35 is not deformed so as to be curved, and damage to each heat transfer tube 37 supported by the tube support plate 35 can be prevented. Even when the pipe support plate 35 moves in the radial direction at the time of an earthquake or when a steam generator is transported, the pipe support plate 35 comes into contact with the piston 79 urged and supported by the coil spring 74. The collision load is attenuated and absorbed, and sufficient safety can be ensured. In this case, a plurality of grooves 80 a, 80 b, 80 c having different lengths for communicating the inside and outside of the jacking block 71 are formed in the piston 79, and when the tube support plate 35 collides with the piston 79, the damping load is reduced. By gradually decreasing, the collision load of the tube support plate 35 can be effectively attenuated. Note that the damping load can be adjusted to a desired value by changing the length and number of the plurality of grooves 80a, 80b, and 80c.

  FIG. 12 is a cross-sectional view of the main part showing the support structure of the tube support plate in the steam generator according to the ninth embodiment of the present invention, FIG. 13 is a plan view of the support disk in the steam generator of the ninth embodiment, and FIG. These are operation | movement explanatory drawings of the support structure of the pipe support plate in the steam generator of Example 9. FIG. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the steam generator of the present embodiment, as shown in FIG. 12, the jack assembly 34 includes a jacking block 81 fixed to the tube group outer cylinder 32, and an inner wall surface of the trunk portion 31 from the jacking block 81. It comprises a plurality of jacking bolts 82 extending toward the end. An opening 81a is formed in the jacking block 81, and a support disk 83 is fixed to the inlet, and the piston 84 approaches and separates from the tube support plate 35 in the opening 81a. The piston 84 is biased and supported in a direction approaching the tube support plate 35 by a coil spring 85 as a biasing member.

  The support disk 83 is made of a material having a higher linear expansion coefficient (thermal expansion coefficient) than the surrounding constituent members such as the jacking block 81. As shown in FIGS. 12 and 13, a through hole 83a is formed in the center. In addition to being formed, four opening inner grooves 83b communicating with the through holes 83a are formed, and on the outer peripheral side, four opening outer grooves 83c are formed between the respective opening inner grooves 83b. An end surface of the through hole 83a is an inclined surface 83d. The piston 84 is made of a material having a higher linear expansion coefficient (thermal expansion coefficient) than that of the jacking block 81, and an inclined surface 84a is formed facing the inclined surface 83d of the support disc 83 as shown in FIG. ing. In this embodiment, the support disk 83 and the piston 84 constitute a thermal expansion movement means.

  When the support disk 83 and the piston 84 are in a low temperature state, the support disk 83 and the piston 84 are not thermally expanded as shown by the solid line in FIG. The tip portion is in contact with the tube support plate 35. On the other hand, when the support disk 83 and the piston 84 are in a high temperature state, the support disk 83 and the piston 84 are thermally expanded as shown by a two-dot chain line in FIG. It moves away from the tube support plate 35 by moving against this. That is, when the support disk 83 is thermally expanded, the outer peripheral portion cannot be expanded outward because it is supported by the jacking block 81, and is expanded inward by the plurality of grooves 83b and 83c. The inner diameter of the hole 83a is reduced. On the other hand, since the piston 84 expands outward due to thermal expansion, the piston 84 moves away from the tube support plate 35 by the action of the inclined surface 83d of the support disc 83 and the inclined surface 84a of the piston 84. .

  Therefore, since the inside of the steam generator is in a high temperature state when the steam generator is in operation, a predetermined gap S is secured between the outer peripheral surface of the tube support plate 35 and the piston 84 in the jack assembly 34, and the tube support plate 35. The piston 84 can be moved relative to the vertical direction (vertical direction) and the radial direction of the body portion 31.

  Accordingly, when a difference in thermal expansion occurs between the body 31 and the tube group outer cylinder 32 and the stay rod 36 and the tube support plate 35 during operation of the steam generator, the tube support plate 35 and the piston 84 are connected to the body 31. However, since the inside of the body portion 31 is in a high temperature state, a clearance S is secured between them, so that the pipe support plate 35 is not restrained by the piston 84 and is curved. Does not deform. Therefore, each heat transfer tube 37 supported by the tube support plate 35 is not subjected to external stress at the position where the tube support plate 35 is supported, and the heat transfer tube 37 is prevented from being damaged.

  On the other hand, when the steam generator is transported, since the inside of the body portion 31 is in a low temperature state, the piston 84 is in contact with the tube support plate 35, and even if the tube support plate 35 moves to the outer peripheral side, this tube support plate 35 is supported by the piston 84, and the pressing load by which the tube support plate 35 presses the piston 84 is absorbed by the urging force of the coil spring 85.

  As described above, in the steam generator according to the ninth embodiment, the piston 84 is biased and supported by the coil assembly 85 in the direction approaching the tube support plate 35 by the jack assembly 34, and the piston 84 and the movement of the piston 84 are supported. The support disk 83 that restricts the movement is constituted by a member having a high linear expansion coefficient, and at high temperatures, the pipe support plate 35 is disposed so as to be movable relative to the piston 84 in a vertical direction with a predetermined gap S. The load received from the tube support plate 35 can be absorbed.

  Therefore, even if a difference in thermal expansion occurs between the tube group outer cylinder 32 and the tube support plate 35, the tube support plate 35 and the piston 84 of the jack assembly 34 can be relatively moved in the vertical direction with a predetermined gap S. Therefore, the tube support plate 35 is not deformed so as to be curved, and damage to each heat transfer tube 37 supported by the tube support plate 35 can be prevented. Even if the tube support plate 35 moves in the radial direction when an earthquake occurs, the tube support plate 35 comes into contact with the piston 84 urged and supported by the coil spring 85 and the collision load is absorbed. Safe safety can be ensured. Further, when the steam generator is transported, the inside of the body portion 31 is in a low temperature state, and the piston 84 comes into contact with the tube support plate 35. Therefore, even if the tube support plate 35 moves in the radial direction, A dynamic load can be absorbed by the coil spring 85 via the piston 84.

  In the present embodiment, the support disk 83 and the piston 84 are used as the thermal expansion movement means and are configured by members having a high linear expansion coefficient. However, either the support disk 83 or the piston 84 is a member having a high linear expansion coefficient. It is good also as a thermal expansion movement means by comprising.

  FIG. 15 is a cross-sectional view of the main part showing the support structure of the tube support plate in the steam generator according to the tenth embodiment of the present invention, and FIG. 16 shows the operation of the support structure of the tube support plate in the steam generator of the tenth embodiment. FIG. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the steam generator of the present embodiment, as shown in FIG. 15, the jack assembly 34 includes a jacking block 81 fixed to the tube group outer cylinder 32, and an inner wall surface of the trunk portion 31 from the jacking block 81. It comprises a plurality of jacking bolts 82 extending toward the end. An opening 81a is formed in the jacking block 81, and a support disk 91 is fixed to the inlet. The piston 92 approaches and separates from the tube support plate 35 in the opening 81a. The piston 92 is urged and supported in a direction approaching the tube support plate 35 by a coil spring 85. A conical ring 93 is interposed between the curved surface 91a of the support disc 91 and the root portion 92a of the piston 92. The conical ring 93 is formed by surrounding components such as the jacking block 81. Is also made of a material having a high linear expansion coefficient (thermal expansion coefficient). In this embodiment, the conical ring 93 constitutes a thermal expansion moving means.

  When the conical ring 93 is in a low temperature state, the conical ring 93 does not thermally expand as shown by a solid line in FIG. In contact. On the other hand, when the conical ring 93 is in a high temperature state, as shown by a two-dot chain line in FIG. 16, the conical ring 93 is thermally expanded, and the piston 92 moves against the urging force of the coil spring 85. , Apart from the tube support plate 35. Therefore, when the steam generator is in operation, the inside is in a high temperature state, so that a predetermined gap S is secured between the outer peripheral surface of the tube support plate 35 and the piston 92 in the jack assembly 34, and the tube support plate 35. The piston 92 can move relative to the vertical direction (vertical direction) and the radial direction of the body portion 31.

  Accordingly, when a difference in thermal expansion occurs between the barrel 31 and the tube group outer cylinder 32, the stay rod 36, and the tube support plate 35 during operation of the steam generator, the tube support plate 35 and the piston 92 are connected to the barrel 31. However, since the inside of the body portion 31 is in a high temperature state, a clearance S is secured between them, so that the tube support plate 35 is not restrained by the piston 92 and is curved. Does not deform. Therefore, each heat transfer tube 37 supported by the tube support plate 35 is not subjected to external stress at the position where the tube support plate 35 is supported, and the heat transfer tube 37 is prevented from being damaged.

  On the other hand, when the steam generator is transported, since the inside of the body portion 31 is in a low temperature state, the piston 92 is in contact with the tube support plate 35, and even if the tube support plate 35 moves to the outer peripheral side, this tube support plate 35 is supported by the piston 92, and the pressing load by which the tube support plate 35 presses the piston 92 is absorbed by the urging force of the coil spring 85.

  As described above, in the steam generator according to the tenth embodiment, the piston 92 is urged and supported by the coil assembly 85 in the direction approaching the tube support plate 35 by the jack assembly 34, and the support disk 91, the piston 92, A conical ring 93 is interposed between the piston ring 92 and the conical ring 93. The conical ring 93 is formed of a member having a high linear expansion coefficient. The piston 92 can absorb the load received from the pipe support plate 35.

  Therefore, even if a difference in thermal expansion occurs between the tube group outer cylinder 32 and the tube support plate 35, the tube support plate 35 and the piston 92 of the jack assembly 34 can be relatively moved in the vertical direction with a predetermined gap S. Therefore, the tube support plate 35 is not deformed so as to be curved, and damage to each heat transfer tube 37 supported by the tube support plate 35 can be prevented. Even if the tube support plate 35 moves in the radial direction when an earthquake occurs, the tube support plate 35 comes into contact with the piston 92 urged and supported by the coil spring 85 and the collision load is absorbed. Safe safety can be ensured. Further, when the steam generator is transported, the inside of the body portion 31 is in a low temperature state, and the piston 92 comes into contact with the tube support plate 35. Therefore, even if the tube support plate 35 moves in the radial direction, A dynamic load can be absorbed by the coil spring 85 via the piston 92.

  In the steam generator according to the present invention, a support connection member that positions and supports the tube group outer cylinder with respect to the body portion and a tube support plate that supports the heat transfer tube are disposed so as to be relatively movable in a vertical direction with a predetermined gap. This prevents the heat transfer tube from being damaged due to the difference in thermal expansion and absorbs the load received from the tube support plate in the event of an earthquake, etc. to improve safety. It can also be applied to.

It is principal part sectional drawing showing the support structure of the pipe support plate in the steam generator which concerns on Example 1 of this invention. It is II-II sectional drawing of FIG. It is a schematic block diagram of the power generation equipment which has a pressurized water reactor to which the steam generator of Example 1 was applied. 1 is a schematic configuration diagram illustrating a steam generator according to Embodiment 1. FIG. It is principal part sectional drawing showing the support structure of the pipe support plate in the steam generator which concerns on Example 2 of this invention. It is principal part sectional drawing showing the support structure of the pipe support plate in the steam generator which concerns on Example 3 of this invention. It is principal part sectional drawing showing the support structure of the pipe support plate in the steam generator which concerns on Example 4 of this invention. It is principal part sectional drawing showing the support structure of the pipe support plate in the steam generator which concerns on Example 5 of this invention. It is principal part sectional drawing showing the support structure of the pipe support plate in the steam generator which concerns on Example 6 of this invention. It is principal part sectional drawing showing the support structure of the pipe support plate in the steam generator which concerns on Example 7 of this invention. It is principal part sectional drawing showing the support structure of the pipe support plate in the steam generator which concerns on Example 8 of this invention. It is principal part sectional drawing showing the support structure of the pipe support plate in the steam generator concerning Example 9 of this invention. It is a top view of the support disk in the steam generator of Example 9. It is action | operation explanatory drawing of the support structure of the pipe support plate in the steam generator of Example 9. It is principal part sectional drawing showing the support structure of the pipe support plate in the steam generator concerning Example 10 of this invention. It is action | operation explanatory drawing of the support structure of the pipe support plate in the steam generator of Example 10.

Explanation of symbols

13 Steam generator 31 Body 32 Tube group outer cylinder 33 Tube plate 34 Jack assembly (support connection member)
35 Tube support plate 36 Stay rod 37 Heat transfer tube 38 Heat transfer tube group 45 Air-water separator 46 Moisture separator 49 Water supply channel 51, 71, 81 Jacking block 52, 72, 82 Jacking bolt 53 Moving body 54 Ring spring ( (Biasing member)
55 Conical helical spring (biasing member)
56 Leaf spring (biasing member)
61 Leaf spring (biasing member, elastic body)
63,75 Working fluid (damping means)
64,77 Through hole (attenuation means)
73, 78, 92 Piston (moving body)
74,85 Coil spring (biasing member)
83 Support disk (thermal expansion movement means)
84 Piston (moving body, thermal expansion moving means)
93 Conical ring (thermal expansion transfer means)

Claims (6)

  A barrel portion having a hollow hermetic shape, a tube group outer cylinder disposed at a predetermined distance from the inner wall surface in the barrel portion, and a plurality of transmissions having an inverted U shape disposed in the tube group outer cylinder. A plurality of heat transfer tubes, each of which is supported by a stay plate extending upward from the tube plate, and a tube plate which is fixed to a lower portion of the body portion and supports the ends of the heat transfer tubes; A plurality of tube support plates for supporting an intermediate portion of the heat transfer tube, a water supply path for supplying water into the barrel and performing heat exchange between the hot water flowing in the plurality of heat transfer tubes, and an upper portion in the barrel A steam generator provided with a steam / water separator that separates feed water into steam and hot water, wherein a plurality of support connection members for positioning and supporting the tube group outer cylinder with respect to the barrel And a plurality of pipes arranged in the circumferential direction between the pipe group outer cylinder and the pipe connection plate and the support connection member. While being arranged relatively movable in the vertical direction with the steam generator, characterized in that the load absorbing means for absorbing the load received from said tube support plate to the support connecting member is provided.   The steam generator according to claim 1, wherein a gap between the tube support plate and the support connection member is set in a range of 1 mm or more.   2. The steam generator according to claim 1, wherein the load absorbing means is a movable body that is supported by the support connection member so as to be able to approach and separate from the tube support plate, and the movable body approaches the tube support plate. 3. And a biasing member that biases and supports the steam generator in a direction to perform.   4. The steam generator according to claim 3, wherein a damping means for attenuating a load received from the tube support plate is provided on the support connection member or the movable body.   4. The steam generator according to claim 3, wherein the support connection member is provided with thermal expansion moving means for moving the moving body in a direction away from the tube support plate by thermal expansion. .   2. The steam generator according to claim 1, wherein the load absorbing means includes an elastic body mounted on the surface of the support connection member so as to face the tube support plate.

Images