JP2015081839A - Fuel storage equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent collision of fuel racks while suppressing vibration to ensure stable support in fuel storage equipment.SOLUTION: A plurality of fuel racks 32 each including a cell storage portion 41 into which a nuclear fuel can be inserted from above along a vertical direction is mounted on a bottom surface 31a of a fuel pool 31 adjacently at predetermined intervals. A coupling device 51 couples the adjacent fuel racks 32 to each other. This coupling device 51 includes: a coupling member 52 having a preset, predetermined horizontal working margin along a horizontal direction and a preset, predetermined vertical working margin along the vertical direction; and a coil spring 53 coupled to the coupling member 52 in series.

Description

  The present invention relates to a fuel storage facility having a fuel rack for temporarily storing spent fuel taken out of a nuclear reactor.

  One of the nuclear power plants is a pressurized water reactor. This pressurized water reactor uses light water as a reactor coolant and neutron moderator, and makes this high temperature and pressure water that does not boil throughout the primary system. Water is sent to a steam generator to generate steam by heat exchange, and this steam can be sent to a turbine generator to generate electricity.

  In such a nuclear power plant, a fuel pool for temporarily storing spent fuel taken out from the pressurized water reactor is provided in the reactor building, and this fuel pool has a large number of spent fuel. A fuel rack that supports the state is installed. Such a fuel rack is generally fixed to the bottom surface via a base plate. However, when the fuel rack is fixed in this way, a large load is applied to the base plate when an earthquake occurs, which leads to an increase in size. Therefore, by mounting the fuel rack slidably with respect to the bottom surface without being fixed to the fuel pool, the horizontal force acting in the event of an earthquake and the like is absorbed by the sliding of the fuel rack, along with the effect of adding water to the fluid. What to do has been proposed.

  Examples of such a fuel rack include those described in the following patent documents. The rack support structure described in Patent Document 1 is provided with a plurality of spring members set to different spring constants as a support structure body that connects a wall surface of a facility and a rack provided on the bottom surface. Moreover, the spent fuel rack support structure described in Patent Document 2 connects adjacent spent fuel racks by a plurality of damper devices.

JP2013-124872A JP 2013-127432 A

  The rack support structure of Patent Document 1 connects a wall surface of a facility and a rack with a plurality of spring members. In this case, the distance between the wall surface of the facility and the rack cannot be increased because the spring member needs to be arranged, and the rack may slide and collide with the wall surface. Spring design is also difficult. Further, when a large number of racks are placed in the facility, the central rack cannot be supported. On the other hand, the spent fuel rack support structure disclosed in Patent Document 2 connects spent fuel racks to each other by a damper device. When an earthquake occurs, the rack not only moves in the horizontal direction, but also rocks in the vertical direction (vibration in which the rack repeats rotational movement around both ends). When the spent fuel racks are connected to each other by the damper device, this rocking vibration is limited, and the damper device may be damaged.

  The present invention solves the above-described problems, and an object of the present invention is to provide a fuel storage facility that enables stable support by preventing a collision of a plurality of fuel racks and suppressing vibration.

  In order to achieve the above object, the fuel storage facility of the present invention comprises a plurality of fuel racks each having a cell storage portion into which nuclear fuel can be inserted from above along a vertical direction with a predetermined gap at the bottom of the fuel pool. In the fuel storage facility in which the adjacent fuel racks are connected to each other by a connecting device, the connecting device has a predetermined horizontal operation allowance set in advance along the horizontal direction and in the vertical direction. A connecting member having a predetermined vertical direction operating allowance set in advance along with an elastic member connected in series with the connecting device.

  Therefore, when an earthquake occurs, the energy of the earthquake acts on the plurality of fuel racks, so that each fuel rack vibrates in the horizontal direction and rocks in the vertical direction. At this time, since the coupling device has a horizontal operation allowance and a vertical operation allowance, the rocking vibration of the fuel rack is allowed without restriction, so that the energy of the earthquake is partially dissipated by the rocking vibration, The amount of horizontal vibration of the fuel rack is reduced. Further, since the coupling device has an elastic member, horizontal vibration of the fuel rack is suppressed, and collision between adjacent fuel racks is prevented. As a result, it is possible to stably support the fuel rack and improve the earthquake resistance.

  In the fuel storage facility of the present invention, the connecting member includes a concave portion opened upward in the vertical direction, and a convex portion that can be inserted into the concave portion so as to secure the horizontal operation margin and the vertical operation margin. It is characterized by having.

  Therefore, the structure can be simplified by securing the horizontal operation allowance and the vertical operation allowance by the recesses and the protrusions provided in the connecting member.

  In the fuel storage facility according to the present invention, the concave portion and the convex portion are provided with a predetermined horizontal gap in the approaching / separating direction of the adjacent fuel racks and a predetermined vertical gap.

  Therefore, by providing the predetermined horizontal gap and the predetermined vertical gap between the concave portion and the convex portion, the horizontal operation margin and the vertical operation margin can be easily secured with a simple configuration.

  In the fuel storage facility according to the present invention, either one of the concave portion and the convex portion is fixed to the wall surface of one of the adjacent fuel racks, and the other is fixed to the wall surface of the other adjacent fuel rack via the elastic member. It is characterized by being fixed.

  Therefore, the concave portion, the convex portion, and the elastic member can be efficiently arranged between the adjacent fuel racks.

  In the fuel storage facility of the present invention, the concave portion is a groove that is open at least upward, and the convex portion is a flat plate piece that can be inserted into the groove.

  Therefore, the structure of the connecting member can be simplified.

  In the fuel storage facility of the present invention, the concave portion is an opening penetrating in the vertical direction, and the convex portion is a shaft that can be inserted into the opening.

  Therefore, the structure can be further simplified by using the concave portion as an opening and the convex portion as an axis.

  In the fuel storage facility of the present invention, the concave portion is provided with a guide plate in which the horizontal operation margin decreases in the insertion direction of the convex portion.

  Therefore, when the convex portion is inserted into the concave portion, the rack can be arranged at an appropriate position by being positioned with respect to the horizontal direction by the guide plate.

  In the fuel storage facility of the present invention, the connecting member includes a pair of first engaging pieces whose one end is fixed to a wall surface of the adjacent fuel rack and the other end extends upward in the vertical direction, and the pair It has the 2nd engagement piece engaged from the upper direction to each other end part of this 1st engagement piece.

  Therefore, the first engaging piece is fixed to each rack and then disposed at a predetermined position, and then the second engaging piece is engaged with the first engaging piece, thereby improving the assembling property. Can do.

  In the fuel storage facility of the present invention, the elastic member is a spring or a damper.

  Therefore, it is possible to simplify the elastic member.

  According to the fuel storage facility of the present invention, as the connecting device for connecting the fuel racks, a connecting member having a horizontal operating allowance and a vertical operating allowance and an elastic member connected in series with the connecting device are provided. Seismic resistance can be improved by preventing a collision of a plurality of fuel racks and suppressing vibrations to enable stable support.

FIG. 1 is a schematic view of a fuel pool representing the fuel storage facility of the first embodiment. FIG. 2 is a schematic diagram showing a fuel storage facility. FIG. 3 is a schematic front view showing a connecting portion between adjacent fuel racks. FIG. 4 is a schematic plan view showing a connecting portion between adjacent fuel racks. FIG. 5 is a schematic plan view illustrating a modified example of the connecting portion of adjacent fuel racks. FIG. 6 is a schematic front view illustrating a modified example of a connecting portion of adjacent fuel racks. FIG. 7 is a schematic configuration diagram illustrating a nuclear power plant. FIG. 8 is a schematic view showing a nuclear reactor containment vessel. FIG. 9 is a schematic view of a fuel pool representing the fuel storage facility of the second embodiment. FIG. 10 is a schematic view of a fuel pool representing the fuel storage facility of the third embodiment. FIG. 11 is a schematic view of a fuel pool representing the fuel storage facility of the fourth embodiment.

  Exemplary embodiments of a fuel storage facility according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment, and when there are two or more embodiments, what comprises combining each embodiment is also included.

[First Embodiment]
FIG. 7 is a schematic configuration diagram illustrating a nuclear power plant, and FIG. 8 is a schematic diagram illustrating a nuclear reactor containment vessel.

  The nuclear reactor applied to the nuclear power plant of the present embodiment uses light water as a reactor coolant and a neutron moderator to produce high-temperature and high-pressure water that does not boil over the entire primary system, and sends this high-temperature and high-pressure water to a steam generator. This is a pressurized water reactor (PWR) that generates steam by heat exchange and sends the steam to a turbine generator to generate electricity.

  That is, in the nuclear power plant having this pressurized water reactor, as shown in FIG. 7, the pressurized water reactor 12 and the steam generator 13 are stored in the reactor containment vessel 11, and this pressurized water atom is stored. The furnace 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 is controlled by the pressurizer 16 so as to maintain a high pressure state of about 160 atm in order to suppress boiling of the primary cooling water in the core. Yes. Therefore, in the pressurized water reactor 12, light water is heated as primary cooling water using low-enriched uranium or MOX as nuclear fuel, and the cooling water pipe 14 is maintained in a state where the high temperature primary cooling water is maintained at a predetermined high pressure by the pressurizer 16. To the steam generator 13. In the steam generator 13, heat exchange is performed between the high-temperature and high-pressure primary cooling water and the secondary cooling water, and the cooled primary cooling 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 condenser pipe 19 is connected to a water intake pipe 24 and a drain pipe 25 for supplying and discharging cooling water (for example, seawater). Accordingly, the steam generated by exchanging heat with the high-pressure and high-temperature primary cooling 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 the generator 23. To generate electricity. 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.

  As shown in FIG. 8, the reactor containment vessel 11 of the nuclear power plant configured as described above accommodates the above-described pressurized water reactor 12, the steam generator 13, the pressurizer 16, and the like. On the other hand, a fuel handling building 30 is installed adjacent to the reactor containment vessel 11, a fuel pool 31 is provided in the fuel handling building 30, and a fuel rack 32 is installed inside the fuel pool 31. . The fuel rack 32 temporarily stores used fuel used in the pressurized water reactor 12 or new fuel to be used in the pressurized water reactor 12 from now on, and is stored in the fuel rack 32. The fuel is filled in the fuel pool 31 and can be cooled by circulating cooling water. Here, the fuel (nuclear fuel) is a fuel assembly.

  Here, the fuel storage facility of the first embodiment will be described in detail. 1 is a schematic diagram of a fuel pool representing the fuel storage facility of the first embodiment, FIG. 2 is a schematic diagram illustrating the fuel storage facility, and FIG. 3 is a front schematic diagram illustrating a connecting portion between adjacent fuel racks. 4 is a schematic plan view showing a connecting portion of adjacent fuel racks.

  As shown in FIGS. 1 and 2, the fuel rack 32 has a rectangular tube shape and is open at the top with a bottom. In the fuel rack 32, a plurality of square tubes along the vertical direction are arranged at equal intervals in the horizontal direction, and a plurality of cell storage portions 41 are formed by fixing each square tube by welding. The fuel rack 32 can be stored by inserting fuel into the plurality of cell storage portions 41 from above along the vertical direction.

  On the other hand, the fuel pool 31 has a bottom surface 31a along the horizontal direction and four wall surfaces 31b along the vertical direction, and is filled with cooling water. Nine fuel racks 32 are arranged with a predetermined gap at the center in the fuel pool 31, and a predetermined gap is secured between each wall surface 31b. In this case, the amount of cooling water in the fuel pool 31 is adjusted so that all the fuel racks 32 are immersed in the cooling water.

  In the present embodiment, nine fuel racks 32 are arranged in the fuel pool 31. However, the number is not limited to this number, and may be less or more than nine. Further, although the fuel rack 32 is directly placed on the bottom surface 31a of the fuel pool 31, a plurality of legs are attached to the lower part of the fuel rack 32 and placed on the bottom surface 31a of the fuel pool 31 via each leg. May be.

  In the support structure of the fuel rack 32 of the present embodiment, a plurality of adjacent fuel racks 32 are connected by a connecting device 51. A plurality (two in the present embodiment) of the coupling devices 51 are arranged in the horizontal direction with respect to the opposing wall surfaces of the adjacent fuel racks 32 and a plurality (two in the present embodiment) in the vertical direction. Is arranged. However, the number of connecting devices 51 may be appropriately changed according to the size of the fuel rack 32 and the like.

  As shown in FIGS. 3 and 4, the coupling device 51 has a predetermined horizontal direction operation allowance set in advance along the horizontal direction and a predetermined vertical direction operation allowance set in advance along the vertical direction. The coupling member 52 and a coil spring 53 as an elastic member coupled in series with the coupling device 52 are provided.

  The connecting member 52 has a first engagement piece 54 and a second engagement piece 55. The first engagement piece 54 is formed by connecting the bottom ends of a pair of opposing vertical wall portions 54a with a bottom portion 54b, thereby forming a recess 56 that opens upward in the vertical direction. The recess 56 is a groove that opens upward and laterally. The second engagement piece 55 is configured by connecting the end of the horizontal wall 55b to the upper end of the vertical wall 55a, thereby forming a convex portion 57 that extends downward in the vertical direction. The convex portion 57 has a predetermined thickness and is a flat plate piece that can be inserted into the concave portion (groove) 56.

  A first engagement piece 54 having a concave portion 56 is fixed to a wall surface 32Aa of one adjacent fuel rack 32A via a coil spring 53, and a second engagement piece 55 having a convex portion 57 is adjacent to the other fuel rack 32B. Is fixed to the wall surface 32Ba.

  In the second engaging piece 55, the convex portion 57 is inserted into the concave portion 56 of the first engaging piece 54 from above. At this time, the connecting member 52 has a predetermined clearance between the convex portion 57 of the second engaging piece 55 and the concave portion 56 of the first engaging piece 54 so that a horizontal operating margin and a vertical operating margin are secured. Is provided. That is, the concave portion 56 and the convex portion 57 are provided with a predetermined horizontal gap S1 and a predetermined vertical gap S2 in the approaching / separating direction of the adjacent fuel racks 32A and 32B.

  The coil spring 53 is stretched between one vertical wall portion 54a of the first engagement piece 54 and the wall surface 32Aa of the fuel rack 32A. In this case, a plurality (two in this embodiment) of the coil springs 53 are arranged in the horizontal direction between the first engagement piece 54 and the fuel rack 32A, and a plurality (in this embodiment) are arranged in the vertical direction. 2).

  As described above, the plurality of fuel racks 32 are placed on the bottom surface 31 a of the fuel pool 31, and the upper part and the lower part are connected by the connecting device 51. Therefore, when the earthquake occurs, the energy of the earthquake acts on the plurality of fuel racks 32, so that each fuel rack 32 vibrates in the horizontal direction and rocks in the vertical direction. In this case, each fuel rack 32 has different vibrations because the number or position of the fuel to be stored is different.

  At this time, since the coupling device 51 has a horizontal operation allowance and a vertical operation allowance, the rocking vibration of the fuel rack 32 is allowed without restriction. That is, since the predetermined horizontal direction gap S1 and the predetermined vertical direction gap S2 are secured between the first engagement piece 54 and the second engagement piece 55, the adjacent fuel racks 32 appropriately rock and vibrate. be able to. Therefore, part of the energy of the earthquake is dissipated by the rocking vibration, and the horizontal vibration amount of the fuel rack 32 is reduced. The coil spring 53 can be deformed in the horizontal and vertical directions during rocking vibration of the fuel rack 32.

  Even if the fuel racks 32 generate different rocking vibrations, the mutual collision is suppressed by the horizontal operation margin and the vertical operation margin. When the fuel rack 32 vibrates horizontally, the lower surface of the fuel rack 32 and the bottom surface 31a of the fuel pool 31 slide, so that a part of the energy of the earthquake is dissipated by the friction. Further, since the coupling device 51 includes the coil spring 53, horizontal vibration of the fuel rack 32 is suppressed, and collision between adjacent fuel racks 32 is prevented.

  In the present embodiment, the connecting member 52 includes the first engaging piece 54 and the second engaging piece 55, the concave portion 56 of the first engaging piece 54 serves as a groove, and the convex portion of the second engaging piece 55. Although 57 is a flat plate piece, it is not limited to this configuration.

  FIG. 5 is a schematic plan view illustrating a modified example of the connecting portion of adjacent fuel racks. In the support structure of the fuel rack 32 of this modified example, as shown in FIG. 5, a plurality of adjacent fuel racks 32 are connected by a connecting device 61. The connecting device 61 includes a connecting member 62 having a predetermined horizontal operation margin set in advance along the horizontal direction and having a predetermined vertical operating allowance set in advance along the vertical direction, and the connecting member 62. And a coil spring 53 as an elastic member connected in series.

  The connecting member 62 has a first engagement piece 64 and a second engagement piece 55. The first engagement piece 64 is formed by forming a square cylinder with a pair of second vertical wall portions 64b facing each other and a pair of first vertical wall portions 64a facing each other, and a lower end portion thereof being connected by a bottom portion 54c. Thus, a recess 66 that opens upward in the vertical direction is formed. The recess 66 has a box shape in which only the upper part is opened. The second engaging piece 55 has a convex portion 57, and the convex portion 57 is a flat plate piece having a predetermined thickness and insertable into the concave portion 66.

  The first engagement piece 64 having the recess 66 is fixed to the wall surface 32Aa of the adjacent fuel rack 32A via the coil spring 53, and the second engagement piece 55 having the protrusion 57 is adjacent to the other fuel. It is fixed to the wall surface 32Ba of the rack 32B.

  In the second engagement piece 55, the convex portion 57 is inserted into the concave portion 66 of the first engagement piece 64 from above. At this time, the connecting member 62 has a predetermined gap between the convex portion 57 of the second engaging piece 55 and the concave portion 66 of the first engaging piece 64 so that a horizontal operating margin and a vertical operating margin are secured. Is provided. That is, the concave portion 66 and the convex portion 57 are provided with a predetermined horizontal gap S1 in the approaching / separating direction of the adjacent fuel racks 32A and 32B and a predetermined vertical gap S2 (see FIG. 3).

  Note that the operation of the connecting device 61 is substantially the same as the operation of the connecting device 51, and thus the description thereof is omitted.

  Moreover, in this embodiment, although the coil spring 53 was applied as an elastic member, another spring may be sufficient and it is not limited to a spring.

  FIG. 6 is a schematic front view illustrating a modified example of a connecting portion of adjacent fuel racks. In the support structure of the fuel rack 32 of this modification, a plurality of adjacent fuel racks 32 are connected by a connecting device 71 as shown in FIG. The connecting device 71 includes a connecting member 52 having a predetermined horizontal direction operating allowance set in advance along the horizontal direction and a predetermined vertical direction operating allowance set in advance along the vertical direction, and the connecting member 52. And a damper 73 as an elastic member connected in series.

  The connecting member 52 has a first engagement piece 54 and a second engagement piece 55. The first engagement piece 54 has a concave portion 66, and the second engagement piece 55 has a convex portion 57, and the convex portion 57 can be inserted into the concave portion 66. The first engaging piece 54 having the concave portion 56 is fixed to the wall surface 32Aa of the adjacent one of the fuel racks 32A via the damper 73, and the second engaging piece 55 having the convex portion 57 is adjacent to the other fuel rack. It is fixed to the wall surface 32Ba of 32B.

  Further, the damper 73 is installed between the first engagement piece 54 and the fuel rack 32A. That is, the damper 73 may be any of a pneumatic type, a hydraulic type, a hydraulic type, and the like.

  Note that the operation of the connecting device 61 is substantially the same as the operation of the connecting device 51, and thus the description thereof is omitted.

  Thus, in the fuel storage facility of the first embodiment, the fuel rack 32 having the cell storage portion 41 into which nuclear fuel can be inserted from above along the vertical direction has a predetermined gap on the bottom surface 31a in the fuel pool 31. A plurality of adjacent fuel racks 32 are connected to each other by a connecting device 51, and the connecting device 51 has a predetermined horizontal operation allowance set in advance along the horizontal direction and has a vertical direction. Are provided with a connecting member 52 having a predetermined vertical direction operating allowance and a coil spring 53 connected in series with the connecting device 52.

  Therefore, when an earthquake occurs, the energy of the earthquake acts on the plurality of fuel racks 32, so that each fuel rack 32 vibrates in the horizontal direction and rocks in the vertical direction. At this time, since the coupling device 51 has a horizontal operation allowance and a vertical operation allowance, the rocking vibration of the fuel rack 32 is allowed without restriction, so that the energy of the earthquake is partially dissipated by the rocking vibration, and as a result As a result, the amount of horizontal vibration of the fuel rack 32 is reduced. Further, since the coupling device 51 includes the coil spring 53, horizontal vibration of the fuel rack 32 is suppressed, and collision between adjacent fuel racks 32 is prevented. As a result, it is possible to stably support the fuel rack 32 and improve the earthquake resistance.

  In the fuel storage facility according to the first embodiment, the connecting member 52 includes a recess 56 that opens upward in the vertical direction, and a protrusion that can be inserted in the recess 56 so as to secure a horizontal operation allowance and a vertical operation allowance. Part 57. Therefore, the structure can be simplified.

  In the fuel storage facility of the first embodiment, the concave portion 56 and the convex portion 57 are provided with a predetermined horizontal gap S1 in the approaching / separating direction of the adjacent fuel rack 32 and a predetermined vertical gap S2. Therefore, the horizontal operation allowance and the vertical operation allowance can be easily secured with a simple configuration.

  In the fuel storage facility of the first embodiment, the convex portion 57 is fixed to the wall surface 32Ba of one adjacent fuel rack 32B, and the concave portion 56 is fixed to the wall surface 32Aa of the other adjacent fuel rack 32A via the coil spring 53. ing. Accordingly, the concave portion 56, the convex portion 57, and the coil spring 53 can be efficiently arranged between the adjacent fuel racks 32.

  In the fuel storage facility of the first embodiment, the concave portion 56 is a groove that opens upward, and the convex portion is a flat plate that can be inserted into the groove. Therefore, the structure of the connecting member 52 can be simplified.

[Second Embodiment]
FIG. 9 is a schematic view of a fuel pool representing the fuel storage facility of the second embodiment. In addition, the same code | symbol is attached | subjected to the member which has the same function as embodiment mentioned above, and detailed description is abbreviate | omitted.

  In the support structure of the fuel rack 32 of the second embodiment, as shown in FIG. 9, a plurality of adjacent fuel racks 32 are connected by a connecting device 81. The connecting device 81 includes a connecting member 82 having a predetermined horizontal direction operating allowance set in advance along the horizontal direction and having a predetermined vertical direction operating allowance set in advance along the vertical direction, and the connecting member 82. And a coil spring 83 as an elastic member connected in series.

  The connecting member 82 has a pair of first engaging pieces 84 and second engaging pieces 85. The first engagement piece 84 is formed by connecting the bottom ends of a pair of opposing vertical wall portions 84a with a bottom portion 84b, thereby forming a recess 86 that opens upward in the vertical direction. The recess 86 is a groove that opens upward and laterally. The second engaging piece 85 is formed by connecting the upper ends of a pair of opposing vertical wall portions 85a by a ceiling portion 85b, thereby forming two convex portions 87 extending downward in the vertical direction. ing. Each convex portion 87 is a flat plate piece having a predetermined thickness that can be inserted into the concave portion (groove) 86.

  One of the first engaging pieces 84 having the recess 86 is fixed to the wall surface 32Aa of the adjacent fuel rack 32A via the coil spring 83, and the other first engaging piece 84 having the recess 86 is adjacent. The other fuel rack 32B is fixed to the wall surface 32Ba. And as for the 2nd engagement piece 85, each convex part 87 is each inserted in the recessed part 86 of a pair of 1st engagement piece 84 from upper direction. At this time, the connecting member 82 is predetermined so that a horizontal operation margin and a vertical operation margin are ensured between the convex portion 87 of the second engagement piece 85 and the concave portion 86 of each first engagement piece 84. A gap is provided. That is, the concave portion 86 and the convex portion 87 are provided with a predetermined horizontal gap S1 and a predetermined vertical gap S2 in the approaching / separating direction of the adjacent fuel racks 32A and 32B.

  Therefore, when the earthquake occurs, the energy of the earthquake acts on the plurality of fuel racks 32 (32A, 32B), so that each fuel rack 32 vibrates in the horizontal direction and rocks in the vertical direction. In this case, each fuel rack 32 has different vibrations because the number or position of the fuel to be stored is different.

  At this time, since the connecting device 81 has a horizontal operation allowance and a vertical operation allowance, the rocking vibration of the fuel rack 32 is allowed without restriction. That is, since the predetermined horizontal direction gap S1 and the predetermined vertical direction gap S2 are ensured between the first engagement pieces 84 and the second engagement pieces 85, the adjacent fuel racks 32 are properly rocked and oscillated. can do. Therefore, part of the energy of the earthquake is dissipated by the rocking vibration, and the horizontal vibration amount of the fuel rack 32 is reduced. Even if the fuel racks 32 generate different rocking vibrations, the mutual collision is suppressed by the horizontal operation margin and the vertical operation margin. When the fuel rack 32 vibrates horizontally, the lower surface of the fuel rack 32 and the bottom surface of the fuel pool slide, and part of the energy of the earthquake is dissipated by the friction. Further, since the coupling device 81 includes the coil spring 83, horizontal vibration of the fuel rack 32 is suppressed, and collision between adjacent fuel racks 32 is prevented.

  As described above, in the fuel storage facility of the second embodiment, adjacent fuel racks 32 are connected to each other by the connecting device 81, and the connecting device 81 is operated in a predetermined horizontal direction set in advance in the horizontal direction. A connecting member 82 having a margin and having a predetermined vertical direction operating margin preset along the vertical direction, and a coil spring 83 coupled in series with the coupling device 82 are provided.

  Accordingly, since the coupling device 81 has a horizontal operation allowance and a vertical operation allowance, the rocking vibration of the fuel rack 32 is allowed without restriction, so that the energy of the earthquake is dissipated and the amount of horizontal vibration of the fuel rack 32 is reduced. Is reduced. Further, since the coupling device 81 includes the coil spring 83, horizontal vibration of the fuel rack 32 is suppressed, and collision between adjacent fuel racks 32 is prevented. As a result, it is possible to stably support the fuel rack 32 and improve the earthquake resistance.

  In the fuel storage facility of the second embodiment, as the connecting member 82, a pair of first members whose one end is fixed to the wall surfaces 32Aa and 32Ba of the adjacent fuel racks 32A and 32B and the other end extends upward in the vertical direction. An engaging piece 84 and a second engaging piece 85 that is engaged from above are provided at the other end portions of the pair of first engaging pieces 84. Therefore, the first engagement piece 84 is fixed to each fuel rack 32 and then disposed at a predetermined position, and then the second engagement piece 85 is engaged with the first engagement piece 84. Can be improved.

[Third Embodiment]
FIG. 10 is a schematic view of a fuel pool representing the fuel storage facility of the third embodiment. In addition, the same code | symbol is attached | subjected to the member which has the same function as embodiment mentioned above, and detailed description is abbreviate | omitted.

  In the support structure of the fuel rack 32 of the third embodiment, as shown in FIG. 10, a plurality of adjacent fuel racks 32 are connected by a connecting device 91. The connecting device 91 includes a connecting member 92 having a predetermined horizontal operating margin set in advance along the horizontal direction and a predetermined vertical operating allowance set in advance along the vertical direction, and the connecting member 92. And a coil spring 93 as an elastic member connected in series.

  The connecting member 92 has a pair of first engaging pieces 94 and second engaging pieces 95. The first engaging piece 94 is configured by connecting the upper end portion of the vertical wall portion 94a with the end portion of the horizontal wall portion 94b, and an opening 96 penetrating in the vertical direction is formed in the horizontal wall portion 94b. A recess opening upward is formed. The second engaging piece 95 is configured such that the connecting pin 95b is fixed to the lateral wall portion 95a, so that a convex portion is formed by a shaft 97 extending downward in the vertical direction.

  The first engagement piece 94 having the opening 96 is fixed to the wall surface 32Aa of the adjacent one of the fuel racks 32A via the coil spring 93, and the second engagement piece 95 having the shaft 97 is adjacent to the other fuel rack. It is fixed to the wall surface 32Ba of 32B. The shaft 97 of the second engagement piece 95 is inserted into the opening 96 of the first engagement piece 94 from above. At this time, the connecting member 92 has a predetermined gap between the shaft 97 of the second engagement piece 95 and the opening 96 of the first engagement piece 94 so that a horizontal operation allowance and a vertical operation allowance are ensured. Is provided. That is, the opening 96 and the shaft 97 are provided with a predetermined horizontal gap S1 and a predetermined vertical gap S2 in the approaching / separating direction of the adjacent fuel racks 32A and 32B.

  Therefore, when the earthquake occurs, the energy of the earthquake acts on the plurality of fuel racks 32 (32A, 32B), so that each fuel rack 32 vibrates in the horizontal direction and rocks in the vertical direction. In this case, each fuel rack 32 has different vibrations because the number or position of the fuel to be stored is different.

  At this time, since the connecting device 91 has a horizontal operation allowance and a vertical operation allowance, the rocking vibration of the fuel rack 32 is allowed without restriction. That is, since the predetermined horizontal direction gap S1 and the predetermined vertical direction gap S2 are secured between the first engagement piece 94 and the second engagement piece 95, the adjacent fuel racks 32 appropriately rock and vibrate. be able to. Therefore, part of the energy of the earthquake is dissipated by the rocking vibration, and the horizontal vibration amount of the fuel rack 32 is reduced. Even if the fuel racks 32 generate different rocking vibrations, the mutual collision is suppressed by the horizontal operation margin and the vertical operation margin. When the fuel rack 32 vibrates horizontally, the lower surface of the fuel rack 32 and the bottom surface of the fuel pool slide, and part of the energy of the earthquake is dissipated by the friction. Further, since the coupling device 91 includes the coil spring 93, horizontal vibration of the fuel rack 32 is suppressed, and collision between adjacent fuel racks 32 is prevented.

  As described above, in the fuel storage facility of the third embodiment, adjacent fuel racks 32 are connected to each other by the connecting device 91, and the connecting device 91 is operated in a predetermined horizontal direction set in advance in the horizontal direction. A coupling member 92 having a margin and having a predetermined vertical operation margin preset in the vertical direction, and a coil spring 83 coupled in series with the coupling member 92 are provided.

  Accordingly, since the coupling device 91 has a horizontal operation allowance and a vertical operation allowance, the rocking vibration of the fuel rack 32 is allowed without restriction, and thus the energy of the earthquake is dissipated and the amount of horizontal vibration of the fuel rack 32 is reduced. Is reduced. Further, since the coupling device 91 includes the coil spring 93, horizontal vibration of the fuel rack 32 is suppressed, and collision between adjacent fuel racks 32 is prevented. As a result, it is possible to stably support the fuel rack 32 and improve the earthquake resistance.

  In the fuel storage facility of the third embodiment, the concave portion is an opening 96 penetrating in the vertical direction, and the convex portion is a shaft 97 that can be inserted into the opening 96. Therefore, the structure can be simplified.

[Fourth Embodiment]
FIG. 11 is a schematic view of a fuel pool representing the fuel storage facility of the fourth embodiment. In addition, the same code | symbol is attached | subjected to the member which has the same function as embodiment mentioned above, and detailed description is abbreviate | omitted.

  In the support structure of the fuel rack 32 of the fourth embodiment, as shown in FIG. 11, a plurality of adjacent fuel racks 32 are connected by a connecting device 101. The connecting device 101 includes a connecting member 102 having a predetermined horizontal direction operating allowance set in advance along the horizontal direction and a predetermined vertical direction operating allowance set in advance along the vertical direction, and the connecting member 102. And a spring device 103 as an elastic member connected in series.

  The connecting member 102 has a first engagement piece 104 and a second engagement piece 105. The first engagement piece 104 is configured by connecting the end of the bottom 104b to the lower end of the vertical wall 104a. The second engagement piece 105 is configured by connecting the end of the horizontal wall 105b to the upper end of the vertical wall 105a. The first engagement piece 104 is formed with a recess 106 that opens upward in the vertical direction, and the second engagement piece 105 is formed with a recess 107 that opens downward in the vertical direction. The first engagement piece 104 is formed with a convex portion 108 extending upward in the vertical direction, and the second engagement piece 105 is formed with a convex portion 109 extending downward in the vertical direction.

  The first engagement piece 104 having the concave portion 106 and the convex portion 108 is fixed to the wall surface 32Aa of one adjacent fuel rack 32A, and the second engagement piece 105 having the concave portion 107 and the convex portion 109 is adjacent to the other fuel rack. It is fixed to the wall surface 32Ba of 32B.

  The first engagement piece 104 has a pair of guide plates 111 and 112 disposed in the recess 106, and the guide plate 111 is disposed between the fuel rack 32 </ b> A and the second engagement piece 105 and has an upper end portion. The support portion 111a is connected to the wall surface 32Aa of the fuel rack 32A, and a support portion 111b is formed at the lower end portion. The guide plate 112 is disposed between the first engagement piece 104 and the second engagement piece 105, and the upper end portion is connected to the vertical wall portion 104a of the first engagement piece 104 by the support portion 112a, and the lower end portion is connected to the guide plate 112. A support portion 112b is formed.

  The spring device 103 is composed of two coil springs 113 and 114. The coil spring 113 is stretched between the wall surface 32Aa of the fuel rack 32A and the support portion 111b of the guide plate 111, and the coil spring 114 is interposed between the support portion 112b of the guide plate 112 and the first engagement piece 104. It is stretched. Therefore, the guide plates 111 and 112 are disposed to face each other with the vertical wall portion 105a interposed therebetween, but the lower end portion is inclined toward the vertical wall portion 105a, so that the gap between the two is narrowed downward. It has become.

  The first engaging piece 104 has a convex portion 108 inserted into the concave portion 107 of the second engaging piece 105 from below, and the second engaging piece 105 has a convex portion 109 having the concave portion 106 of the first engaging piece 104. Is inserted from above. At this time, the connecting member 102 has a horizontal operation margin and a vertical operation margin between the concave portion 106 and the convex portion 108 of the first engagement piece 104 and the concave portion 107 and the convex portion 109 of the second engagement piece 105. A predetermined gap is provided so as to ensure the above. In this case, since the guide plates 111 and 112 are inclined, the horizontal operating margin of the concave portion 106 of the first engagement piece 104 decreases toward the insertion direction of the convex portion 109 of the second engagement piece 105. ing.

  Therefore, when the earthquake occurs, the energy of the earthquake acts on the plurality of fuel racks 32, so that each fuel rack 32 vibrates in the horizontal direction and rocks in the vertical direction. In this case, each fuel rack 32 has different vibrations because the number or position of the fuel to be stored is different.

  At this time, since the coupling device 101 has a horizontal operation allowance and a vertical operation allowance, the rocking vibration of the fuel rack 32 is allowed without restriction. That is, since the predetermined horizontal gap and the predetermined vertical gap are secured between the first engagement piece 104 and the second engagement piece 105, the adjacent fuel racks 32 can appropriately rock and vibrate. it can. Therefore, part of the energy of the earthquake is dissipated by the rocking vibration, and the horizontal vibration amount of the fuel rack 32 is reduced.

  Even if the fuel racks 32 generate different rocking vibrations, the mutual collision is suppressed by the horizontal operation margin and the vertical operation margin. When the fuel rack 32 vibrates horizontally, the lower surface of the fuel rack 32 and the bottom surface of the fuel pool slide, and part of the energy of the earthquake is dissipated by the friction. Further, since the coupling device 101 includes the spring device 103, the horizontal vibration of the fuel rack 32 is suppressed, and collision between adjacent fuel racks 32 is prevented.

  Thus, in the fuel storage facility of the fourth embodiment, adjacent fuel racks 32 are connected to each other by the connecting device 101, and the connecting device 101 is operated in a predetermined horizontal direction set in advance along the horizontal direction. A connecting member 102 having a margin and having a predetermined vertical direction operating margin preset along the vertical direction, and a spring device 103 coupled in series with the coupling member 102 are provided.

  Therefore, since the coupling device 101 has a horizontal operation allowance and a vertical operation allowance, the rocking vibration of the fuel rack 32 is allowed without restriction, so that the energy of the earthquake is dissipated and the amount of horizontal vibration of the fuel rack 32 is reduced. Is reduced. Further, since the coupling device 101 includes the spring device 103, the horizontal vibration of the fuel rack 32 is suppressed, and collision between adjacent fuel racks 32 is prevented. As a result, it is possible to stably support the fuel rack 32 and improve the earthquake resistance.

  In the fuel storage facility according to the fourth embodiment, guide plates 111 and 112 are provided in the concave portion 106 so that the horizontal operation allowance decreases in the insertion direction of the convex portion 109. Therefore, when the convex portion 109 is inserted into the concave portion 106, the fuel rack can be arranged at an appropriate position by being positioned with respect to the horizontal direction by the guide plates 111 and 112.

  In each of the above-described embodiments, the fuel storage facility of the present invention has been described as applied to a pressurized water reactor. However, the present invention can also be applied to a boiling water reactor (BWR). You may apply to.

DESCRIPTION OF SYMBOLS 11 Reactor containment vessel 12 Pressurized water reactor 13 Steam generator 31 Fuel pool 32 Fuel rack 51, 61, 71, 81, 91, 101 Connecting device 52, 62, 82, 92, 102 Connecting member 53, 83, 93, 113, 114 coil spring (elastic member)
54, 64, 84, 94, 104 First engaging piece 55, 85, 95, 105 Second engaging piece 56, 66, 86, 106, 107 Concave portion 57, 87, 108, 109 Convex portion 73 Damper (elastic member )
96 opening (concave)
97 axis (convex)
103 Spring device (elastic member)
111, 112 guide plate

Claims (9)

A plurality of fuel racks having cell storage portions into which nuclear fuel can be inserted from above along the vertical direction are placed adjacent to each other with a predetermined gap on the bottom surface of the fuel pool, and the adjacent fuel racks are connected by a connecting device. In connected fuel storage facilities,
The connecting device is
A connecting member having a predetermined horizontal direction operating allowance set in advance along the horizontal direction and having a predetermined vertical direction operating allowance set in advance along the vertical direction;
An elastic member connected in series with the connecting device;
A fuel storage facility comprising:   The connecting member includes a concave portion opened upward in the vertical direction, and a convex portion that can be inserted in the concave portion so as to secure the horizontal operation margin and the vertical operation margin. The fuel storage facility according to claim 1.   3. The fuel storage facility according to claim 2, wherein the concave portion and the convex portion are provided with a predetermined horizontal gap and a predetermined vertical gap in an approaching and separating direction of the adjacent fuel racks.   One of the concave portion and the convex portion is fixed to the wall surface of the one adjacent fuel rack, and the other is fixed to the wall surface of the other adjacent fuel rack via the elastic member. The fuel storage facility according to claim 2 or claim 3.   The fuel according to any one of claims 2 to 4, wherein the concave portion is a groove that is open at least upward, and the convex portion is a flat plate piece that can be inserted into the groove. Storage facilities.   5. The fuel storage facility according to claim 2, wherein the concave portion is an opening penetrating in a vertical direction, and the convex portion is a shaft that can be inserted into the opening. .   The fuel storage facility according to any one of claims 2 to 6, wherein the concave portion is provided with a guide plate in which the horizontal operation margin decreases in an insertion direction of the convex portion.   The connecting member includes a pair of first engaging pieces whose one end is fixed to a wall surface of the adjacent fuel rack and whose other end extends upward in the vertical direction, and each of the pair of first engaging pieces. The fuel storage facility according to claim 1, further comprising a second engagement piece that engages with the other end portion from above.   The fuel storage facility according to any one of claims 1 to 8, wherein the elastic member is a spring or a damper.

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