JP2008111674A - Storage structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage structure which can restrain the collision of accommodated objects with a storage container. <P>SOLUTION: Racks 10 for accommodating spent fuel rods 5, stored objects, are stored in the water 38 pooled in a pit 30, and a buffer block 20 alienated from the inner wall 32 of the pit 30 and the racks 10 is placed between them. Owing to this structure, the vibration is attenuated by the water 38 pooled in the pit 30 even if a big vibration such as an extensive earthquake occurs, and the racks 10 also come into contact with the buffer block 20 even if they jolt hard because the vibration is not attenuated completely by the water 38. Therefore, the vibration of the racks 10 is absorbed by the buffer block 20 when they come into contact with it and the vibration stops. As a result, the collision of the racks 10 as accommodated objects with the pit 30 as a storage container can be restrained. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a storage structure. In particular, the present invention relates to a storage structure that suppresses breakage when vibration occurs.

  Examples of the storage structure for storing stored items include a fuel storage rack for storing used fuel rods used in a nuclear reactor, a fuel storage facility, and the like. In the fuel storage facility, a plurality of used fuel rods are supported by a support grid to form a fuel assembly, and the fuel assembly is accommodated in a fuel storage rack of a square tube. The fuel storage racks are installed vertically at a predetermined interval and stored while being cooled in the water of the fuel storage facility. Some fuel storage racks are stored without being fixed to the wall surface or bottom surface of the fuel storage facility (free standing structure).

  In such a free-standing structure fuel storage rack, a sliding frictional force acts between the bottom of the rack and the bottom surface of the fuel storage facility, and the sliding friction force is held on the bottom surface of the fuel storage facility. In the free-standing structure, the fuel storage rack is held by the sliding frictional force between the bottom of the fuel storage facility as described above. Therefore, when a vibration such as an earthquake occurs, the vibration is caused by this sliding frictional force. Vibrations that are damped and transmitted to the fuel storage rack are mitigated. However, in the free-standing structure, the fuel storage rack is held by sliding friction. For example, when a large vibration such as a large earthquake occurs, it may be difficult to reduce the vibration only by sliding friction. There is. For this reason, some conventional storage structures alleviate vibrations by means other than sliding friction.

  For example, in the storage structure described in Patent Document 1, the fuel storage facility is filled with water, a resistance plate is provided on the outer surface of the fuel storage rack, and the fuel storage rack is placed inside the fuel storage facility filled with water. It arranges in. Thereby, when a large vibration occurs, the vibration transmitted to the fuel storage rack is attenuated by the resistance of the resistance plate of the fuel storage rack with respect to the water in the fuel storage facility. As a result, even when a large vibration occurs, the vibration of the fuel storage rack can be reduced.

JP 2006-162595 A

  However, even when the vibration is attenuated by the resistance between the water in the fuel storage facility and the resistance plate of the fuel storage rack, if the vibration is still larger, the vibration of the fuel storage rack may not be able to be alleviated. Even if the vibration of the fuel storage rack is reduced, if the vibration time is long, the fuel storage rack continues to vibrate with a small amplitude. is there. For this reason, the fuel storage rack may collide with the inner wall of the fuel storage facility, thereby damaging the inner wall of the fuel storage facility.

  This invention is made | formed in view of the above, Comprising: It aims at providing the storage structure which can suppress the collision with a stored item and a storage container.

  In order to solve the above-described problems and achieve the object, a storage structure according to the present invention includes a storage for storing a storage and a storage for storing the storage in the liquid while being provided so as to be able to store the liquid. And a buffer provided in the liquid stored in the storage container and spaced from the inner wall of the storage container and the container, and disposed between the inner wall and the container. It is characterized by providing.

  In the present invention, the contents are stored in the liquid stored in the storage container, and a buffer body spaced from these is provided between the inner wall of the storage container and the contents. As a result, even when a large vibration such as a large-scale earthquake occurs, the vibration is attenuated by the liquid stored in the storage container. Touch the body. For this reason, the vibration of the stored item is absorbed by the buffer when contacting the buffer, and the vibration stops. As a result, the collision between the stored item and the storage container can be suppressed.

  Moreover, the storage structure according to the present invention is characterized in that the buffer is disposed in the storage container without being fixed to the storage container.

  In this invention, since the buffer is not fixed to the storage container, the buffer is disposed by frictional force with the storage container. For this reason, when the stored object vibrates and collides with the buffer, the shock can be absorbed by the frictional force between the buffer and the storage container, so that the vibration of the stored object can be stopped more reliably. Further, the vibration can be attenuated by the resistance force of the liquid between the buffer and the inner wall of the storage container. As a result, it is possible to more reliably suppress the collision between the stored item and the storage container.

  Further, the storage structure according to the present invention is characterized in that the buffer body is formed with an uneven surface.

  In the present invention, since the surface of the buffer body is formed with irregularities, the fluid resistance of the surface of the buffer body can be increased. As a result, the liquid flowing on the surface of the buffer when the liquid intervening between the buffer and the buffer flows out from between the buffer and the buffer by vibrating the buffer and approaching the buffer. Since it becomes difficult to flow due to the fluid resistance of this surface, it becomes difficult to flow out between the accommodation and the buffer. For this reason, when the container vibrates, the vibration can be more reliably damped by the liquid interposed between the container and the buffer. As a result, it is possible to more reliably suppress the collision between the stored item and the storage container.

  Further, in the storage structure according to the present invention, the buffer body includes a buffer unit capable of buffering a force in a direction in which the inner wall of the storage container located on both sides of the buffer body and the storage object approach each other. It is characterized by.

  In the present invention, since the buffer means is provided in the buffer body, when the contents vibrate and collide with the buffer body, the shock energy can be absorbed by the buffer means. As a result, it is possible to more reliably suppress the collision between the stored item and the storage container.

  In the storage structure according to the present invention, in the buffer, the height from the bottom surface of the storage container to the upper end of the buffer body is higher than the height from the bottom surface of the storage container to the upper end of the stored item. It is characterized by.

  In the present invention, since the height of the buffer is higher than the height of the container, the liquid that is interposed between the container and the buffer is transferred when the container vibrates and approaches the buffer. When the liquid flows out between the buffer and the buffer, the liquid can flow only upward or on the container side, so that it is difficult to flow out. For this reason, when the container vibrates, the vibration can be more reliably damped by the liquid interposed between the container and the buffer. As a result, it is possible to more reliably suppress the collision between the stored item and the storage container.

  Further, in the storage structure according to the present invention, the shock absorber is provided with a shock absorber-side resistance plate protruding in the direction of the container at a position where the height from the bottom surface of the storage container is higher than the upper end of the container. It is characterized by being.

  In this invention, since the shock absorber side resistance plate is provided at a position higher than the upper end of the accommodation in the shock absorber, the shock is caused to come close to the shock absorber so that it is interposed between the shock absorber and the shock absorber. When the liquid flows out between the container and the buffer, the liquid becomes difficult to flow out. For this reason, when the container vibrates, the vibration can be more reliably damped by the liquid interposed between the container and the buffer. As a result, it is possible to more reliably suppress the collision between the stored item and the storage container.

  In the storage structure according to the present invention, the inner wall-side resistance plate that protrudes in the direction of the buffer body on the inner wall of the storage container at a position where the height from the bottom surface of the storage container is higher than the upper end of the buffer body. Is provided.

  In this invention, the inner wall side resistance board is provided in the position higher than the upper end of the buffer in the inner wall of a storage container. For this reason, the container vibrates and collides with the buffer, and the buffer moves together with the container and approaches the inner wall of the storage container, so that the liquid interposed between the inner wall of the storage container and the buffer is separated from the inner wall. When flowing out from between the buffer bodies, the liquid becomes difficult to flow out. Therefore, when the container vibrates and collides with the buffer, the movement of the buffer can be mitigated by the liquid interposed between the inner wall of the storage container and the buffer. As a result, it is possible to more reliably suppress the collision between the stored item and the storage container.

  In the storage structure according to the present invention, the buffer has a wall that forms the surface of the buffer, and a cavity defined by the wall is formed inside the buffer. It is characterized by that.

  In this invention, since the cavity is formed inside the shock absorber, the shock energy can be absorbed by the deformation of the shock absorber when the accommodation object vibrates and collides with the shock absorber. As a result, it is possible to more reliably suppress the collision between the stored item and the storage container.

  The storage structure according to the present invention is characterized in that a plurality of through holes, which are holes for communicating the surface and the cavity, are formed in the wall body.

  In the present invention, since a plurality of through holes are formed in the buffer body, the container vibrates and approaches the buffer body, and when the liquid between the container and the buffer body flows out between these, The liquid also flows through the plurality of through holes of the buffer. Thus, when the fluid flows through the through hole, a pressure loss occurs. However, since a plurality of through holes are formed, the pressure loss is further increased. For this reason, fluid resistance becomes large and liquid becomes difficult to flow. Therefore, when the container vibrates, the vibration can be more reliably damped by the liquid interposed between the container and the buffer. As a result, it is possible to more reliably suppress the collision between the stored item and the storage container.

  The storage structure according to the present invention is characterized in that the upper end of the cavity is closed in the buffer.

  In this invention, since the upper end of the cavity part is obstruct | occluded in this invention, rigidity can be ensured moderately, forming a cavity part. As a result, when the contents vibrate and collide with the buffer, a larger impact energy can be absorbed by the buffer. In addition, by closing the upper end of the cavity, the cooling medium can flow out only from the outlet when the cooling medium is provided with a cooling passage to be described later and the cooling medium flows. Can flow toward the contents. As a result, when the stored item contains the stored item that needs to be cooled, the stored item can be more reliably cooled by the cooling medium.

  In the storage structure according to the present invention, the shock absorber is provided with a cooling passage through which a cooling medium capable of cooling the stored item flows, and the cooling medium flows out in the direction of the stored item. A possible outlet is formed.

  In this invention, the cooling passage is provided inside the buffer body, and the outlet is further formed in the buffer body. For this reason, a cooling medium can be flowed toward the accommodation. As a result, when the stored item contains the stored item that needs to be cooled, the stored item can be cooled by the cooling medium.

  In the storage structure according to the present invention, the container is provided on a base plate disposed in the storage container, and the base plate is provided with the outlet formed in the buffer body. An inflow port through which the cooled cooling medium can flow into the base plate and a supply port through which the cooling medium flowing into the base plate can be supplied to the stored items stored in the storage material are formed. It is characterized by.

  According to the present invention, an inlet through which a cooling medium can flow into the board, and a supply port through which the cooling medium that has flowed into the board can be supplied to a stored item stored in the container, are provided on the board on which the container is provided. Therefore, the stored item can be cooled by the cooling medium even when the stored item is disposed on the base plate. As a result, the stored item can be cooled more reliably.

  The storage structure according to the present invention has an effect that the collision between the stored item and the storage container can be suppressed.

  Below, the Example of the storage structure concerning this invention is described in detail based on drawing. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIG. 1 is a perspective view showing a fuel assembly and a square tube stored by the storage structure according to the first embodiment of the present invention. As shown in the figure, the spent fuel rods 5 used in the nuclear reactor are supported by a plurality of fuel rods 5 being collected and supported by a plurality of grid-like support grids 6 as stored items. It is formed. A fuel assembly 7 composed of a plurality of fuel rods 5 is accommodated in a rack cell 11 formed by a square tube.

  FIG. 2 is a cross-sectional view of the storage structure according to the first embodiment of the present invention. FIG. 3 is a perspective view of the storage structure shown in FIG. As shown in the figure, the rack cell 11 of the storage structure 1 has a plurality of rack cells 11 connected by a support member (not shown), and the plurality of connected rack cells 11 are made of steel or non-ferrous metal. The surroundings are covered with a surrounding plate 12 formed by a plate without a gap, thereby forming a group. Furthermore, a plurality of groups of rack cells 11 are provided and connected to each other. The plurality of rack cells 11 in which the fuel assemblies 7 are accommodated are connected to each other in this manner, and are provided as a fuel storage rack (hereinafter referred to as a rack) 10 that is an accommodation. The rack 10 is disposed in a fuel storage facility (hereinafter referred to as a pit) 30 which is a storage container.

  The rack cell 11 constituting the rack 10 is made of boron-added stainless steel to which 1 wt% or more of boron is added, and the pit 30 in which the rack 10 is disposed is made of a concrete frame.

  A base 15 is provided in the pit 30, and the base 15 is disposed on the bottom surface 31 of the pit 30. The rack 10 disposed in the pit 30 is disposed on the base plate 15. In this way, the rack 10 arranged on the base plate 15 is provided with a plurality of rack cells 11 in a vertical direction, and is fixed to the base plate 15 by fixing means such as bolts (not shown). , Is placed on the base plate 15. On the other hand, the base 15 is not fixed to the bottom surface 31 of the pit 30 but is disposed on the bottom surface 31 of the pit 30. Therefore, the rack 10 is not fixed to the pit 30 and the rack 10 is provided in the pit 30 by a free standing structure.

  The rack 10 and the base 15 are separated from the inner wall 32 of the pit 30, and a buffer block 20 that is a buffer is disposed between the rack 10 and the base 15 and the inner wall 32 of the pit 30. ing. The buffer block 20 is spaced from the rack 10, the base plate 15, and the inner wall 32 of the pit 30, and is disposed between the rack 10 and the base plate 15 and the inner wall 32 of the pit 30. The buffer block 20 arranged in this way is formed in a substantially rectangular parallelepiped shape, and a hollow portion 22 is formed inside. That is, the buffer block 20 has a wall body 21 that forms the surface of the buffer block 20, and the cavity 22 is defined by the wall body 21 and formed inside the buffer block 20. The cavity 22 is formed with ribs 23 that secure strength from the direction in which the rack 10 is provided in the buffer block 20 to the direction in which the inner wall 32 of the pit 30 is provided.

  In addition, a plurality of buffer blocks 20 are provided, and are arranged around the rack 10 and the base 15. In other words, the plurality of buffer blocks 20 are disposed in the pit 30 along the inner wall 32 in the vicinity of the inner wall 32 of the pit 30. Further, the buffer block 20 is disposed on the bottom surface 31 of the pit 30 and is provided without being fixed to the bottom surface 31. That is, the buffer block 20 is disposed in the pit 30 without being fixed to the pit 30. Further, all the buffer blocks 20 can be connected to each other by the wall 21 on the rack 10 side without gaps, or the resistance by the fluid can be increased by reducing the gaps.

  The pit 30 is provided with a plurality of underwater illuminators 35 above the rack 10 and the buffer block 20. The underwater illuminator 35 is attached to an illumination support member 36 provided along the inner wall 32 of the pit 30. The pit 30 is filled with water 38 which is a liquid stored in the pit 30, the rack 10 is stored in the water 38, and a buffer block is also provided in the water 38. It has been.

  The storage structure 1 according to the first embodiment is configured as described above, and the operation thereof will be described below. The rack 10 in which the fuel rods 5 are stored is stored in water 38 filled in the pit 30. For this reason, the fuel assembly 7 is cooled by removing the decay heat of the fuel rods 5 in the water 38, and the radiation emitted from the fuel rods 5 is stored while being shielded by the water 38. Further, neutrons are emitted from the fuel rod 5, but the rack cell 11 constituting the rack 10 is formed of boron-added stainless steel. Therefore, the neutron emitted from the fuel rod 5 is caused by the rack cell 11. Absorbed. Further, gamma rays are radiated from the fuel rod 5, but the pit 30 in which the rack 10 is disposed is made of a concrete frame. For this reason, the gamma rays radiated from the fuel rod 5 are shielded by the pits 30.

  When a large vibration such as a large-scale earthquake occurs, the vibration is transmitted to the rack 10 in the pit 30 and the rack 10 tries to vibrate. It is not fixed to the bottom surface 31 of the pit 30 but is disposed on the bottom surface 31 of the pit 30. For this reason, the vibration transmitted to the rack 10 is attenuated by the sliding frictional force between the base plate 15 to which the rack 10 is fixed and the bottom surface 31 of the pit 30, and the vibration of the rack 10 is mitigated. Further, since the rack 10 and the base 15 are disposed in the water 38 in the pit 30, the vibration between the rack 10 and the base 15 is attenuated by the water 38. Therefore, this also reduces the vibration of the rack 10.

  The vibration transmitted to the rack 10 is attenuated and mitigated by the sliding frictional force between the water 38 stored in the pit 30 and the base plate 15 and the bottom surface 31 of the pit 30, but the rack 10 has a free-standing structure. Therefore, the rack 10 may move together with the base plate 15 due to the vibration when the vibration is larger or the vibration time is longer. In this case, the distance between the buffer block 20 provided around the rack 10 and the rack 10 is close, but water 38 is interposed between the rack 10 and the buffer block 20. For this reason, in order for the rack 10 to approach the buffer block 20, the water 38 interposed between the rack 10 and the buffer block 20 needs to flow out from between these, and the flow of the water 38 has a resistance to fluid resistance. Thus, the kinetic energy in the moving direction of the rack 10 is attenuated. Therefore, the movement of the rack 10 in the direction of the buffer block 20 is relaxed.

  Here, the displacement of the rack 10 at the time of occurrence of vibration, which changes depending on the presence or absence of water 38 interposed between the rack 10 and the buffer block 20, will be described. Since the displacement of the rack 10 at the time of the occurrence of vibration varies depending on the presence or absence of the water 38 interposed between the rack 10 and the buffer block 20, a test is performed by inputting seismic waves into the storage structure 1 in order to investigate this displacement. The amount of movement of the rack 10 at that time was measured to determine the rack response level. In this test, the rack response level is determined with and without the water 38 interposed between the rack 10 and the buffer block 20, and a comparison is made between the rack 10 and the buffer block 20. The effect due to the presence of water 38 was verified.

  FIG. 4 is a diagram showing test results when the seismic excitation test is performed in the storage structure according to FIG. In addition, the horizontal axis in the figure shows the input level of the seismic wave input to the storage structure 1 during the test, and shows the dimensionless dimension with the maximum acceleration of the seismic wave during the test being 1.0. The vertical axis indicates the response level of the rack 10 due to the input seismic wave, that is, the amount of displacement when the rack 10 moves due to vibration, and the case where the rack 10 does not move even when the seismic wave is input is 0.0. The case where the rack 10 moves and comes into contact with the buffer block 20 is shown as 1.0 and is made dimensionless.

  This seismic vibration test was performed when water 38 was stored in the pit 30 and when water 38 was not stored. According to this test result, when the water 38 is not stored in the pit 30, that is, when the water 38 is not interposed between the rack 10 and the buffer block 20 and the rack 10 and the buffer block 20 are in the air. When the seismic wave is input, the displacement amount of the rack 10 increases, and the response of the rack 10 increases. That is, as shown in FIG. 4, the air response level 3, which is the response level of the rack 10 in the air to the input seismic wave, becomes large even when the input earthquake level is small.

  On the other hand, when the water 38 is stored in the pit 30, that is, when the water 38 is interposed between the rack 10 and the buffer block 20 and the rack 10 and the buffer block 20 are in water, the seismic wave The amount of displacement of the rack 10 when “” is input is reduced, and the response of the rack 10 is reduced. That is, as shown in FIG. 4, the underwater response level 4, which is the response level of the rack 10 in water to the input seismic wave, remains 0 when the input earthquake level is a predetermined low level, and even when the input earthquake level increases. The low level is maintained with respect to the air response level 3.

  Therefore, as is apparent from this seismic excitation test, when water 38 is interposed between the rack 10 and the buffer block 20, compared with the case where water 38 is not interposed between the rack 10 and the buffer block 20, The response level of the rack 10 is reduced. That is, when water 38 is interposed between the rack 10 and the buffer block 20, the water 38 acts as a fluid resistance to attenuate the kinetic energy in the moving direction of the rack 10, and the rack in the direction of the buffer block 20. The amount of displacement of 10 becomes small.

  In this way, when the rack 10 vibrates, the vibration of the rack 10 is attenuated by the water 38 interposed between the rack 10 and the buffer block 20 and the movement of the rack 10 is mitigated. When the vibration of the rack 10 overcomes these fluid resistances and moves, the rack 10 collides with and comes into contact with the buffer block 20 disposed around the rack 10, and the rack 10 stops. At that time, the buffer block 20 is provided without being fixed to the bottom surface 31 of the pit 30, so that when the rack 10 collides with the buffer block 20, the space between the bottom surface 31 of the pit 30 and the buffer block 20 is provided. The impact at the time of collision is absorbed by the sliding friction. Further, the buffer block 20 has a hollow portion 22 formed therein. For this reason, when the rack 10 collides with the buffer block 20, the shock at the time of collision is absorbed by the buffer block 20 being deformed.

  In the storage structure 1 described above, the rack 10 is stored in the water 38 stored in the pit 30, and the buffer block 20 separated from these is provided between the inner wall 32 of the pit 30 and the rack 10. Thereby, even when a large vibration such as a large-scale earthquake occurs, the vibration is attenuated by the water 38 stored in the pit 30. In other words, by disposing the buffer block 20 around the rack 10, the distance between the rack 10 and the portion provided around the rack 10 with the water 38 interposed therebetween is reduced, so that the fluid addition damping force is increased. . That is, by disposing the buffer block 20 around the rack 10, the distance between the buffer block 20 and the rack 10 is greater than the distance between the inner wall 32 of the pit 30 and the rack 10 when the buffer block 20 is not provided. Is close. For this reason, the fluid addition damping force by the water 38 between the buffer block 20 and the rack 10 rather than the fluid addition damping force by the water 38 between the inner wall 32 of the pit 30 and the rack 10 when the buffer block 20 is not provided. Is bigger. Thereby, the response displacement of the rack 10 when vibration occurs can be reduced. Even when the rack 10 is vibrated greatly without being damped by the water 38, the rack 10 contacts the buffer block 20. For this reason, the vibration of the rack 10 is absorbed by the buffer block when contacting the buffer block 20, and the vibration stops. As a result, the collision between the rack 10 and the pit 30 can be suppressed.

  Further, since the buffer block 20 is not fixed to the pit 30, the buffer block 20 is disposed by a sliding frictional force with the pit 30. For this reason, when the rack 10 vibrates and collides with the buffer block 20, the impact can be absorbed by the sliding frictional force between the buffer block 20 and the pit 30, so that the vibration of the rack 10 can be stopped more reliably. . As a result, the collision between the rack 10 and the pit 30 can be more reliably suppressed.

  Further, since the cavity 22 is formed inside the buffer block 20, when the rack 10 vibrates and collides with the buffer block 20, the shock block 20 can be deformed to absorb impact energy. . As a result, the collision between the rack 10 and the pit 30 can be more reliably suppressed.

  In addition, since the buffer block 20 is disposed independently on the bottom surface 31 of the pit 30, even when the buffer block 20 is provided, it is possible to suppress the load from acting on the inner wall 32 of the pit 30. As a result, damage to the inner wall 32 of the pit 30 can be suppressed.

  The base plate 15 and the bottom surface 31 of the pit 30 are not fixed, and the base plate 15 is held by a sliding frictional force between the base plate 15 and the bottom surface 31 of the pit 30. The rack 10 may be fixed to the bottom surface 31 of the pit 30 by fixing means such as), and the rack 10 may be held on the base plate 15 by sliding frictional force without fixing the rack 10 to the base plate 15. Thereby, when a large vibration is generated, the vibration is attenuated by the sliding frictional force between the rack 10 and the base 15, so that the vibration of the rack 10 is reduced.

  The rack cell 11 is surrounded by a plurality of rack cells 11 connected by a support member with a surrounding plate 12. However, if the seismic force is not large, the rack cell 11 is not necessarily covered with the surrounding plate 12. Also good. When the rack cell 11 is not covered with the surrounding plate 12, the attenuation due to the water 38 is reduced when vibration is generated as compared with the case where the surrounding plate 12 is provided. However, the structure is simplified, so that the manufacturing is easy. Become. Thereby, the manufacturing cost can be reduced. Furthermore, when the fuel rod 5 accommodated in the rack cell 11 is completely burned and there is no possibility of reaching the criticality, and when boron is added to the water 38 stored in the pit 30, the rack cells 11 can be brought into close contact with each other. However, in this case, it is not always necessary to cover the rack cell 11 with the surrounding plate 12. Further, when a gap exists between the adjacent rack cells 11, the gap between the adjacent rack cells 11 may be closed with a bar or a steel strip instead of the surrounding plate 12, and the retreat path of the water 38 may be closed.

  The storage structure 40 according to the second embodiment has substantially the same configuration as the storage structure 1 according to the first embodiment, but is characterized in that a cooling water pipe 41 is provided inside the buffer block 45. Since other configurations are the same as those of the first embodiment, the description thereof is omitted and the same reference numerals are given. FIG. 5 is a cross-sectional view of the storage structure according to the second embodiment of the present invention. 6 is a perspective view of the storage structure shown in FIG. In the storage structure 40 shown in the figure, a cooling water pipe 41, which is a cooling passage through which cooling water that is a cooling medium capable of cooling the fuel rod 5 flows, projects from the inner wall 32 of the pit 30 into the pit 30. Is provided. Further, the cooling water pipe 41 enters from the upper side of the buffer block 45 disposed in the pit 30 to the inside of the buffer block 45, that is, into the cavity 22, and is provided in the buffer block 45. Thus, the cooling water pipe 41 provided in the buffer block 45 is provided with a pipe end portion 42 that is an outlet of the cooling water facing downward. Thereby, when the fuel assembly 7 is accommodated in the rack cell 11, the fuel assembly 7 is not shaken by the cooling water discharged from the pipe end portion 42, and the fuel assembly 7 is easily accommodated in the rack cell 11. can do. Further, above the pit 30, a water absorption pipe 43, which is a pipe that absorbs the water 38 warmed by the decay heat of the spent fuel rod 5, is disposed (FIG. 5). The water absorption pipe 43 enters the water 38 stored in the pit from above the pit 30, and the pipe end 44, which is the tip of the water absorption pipe 43, is located above the rack 10 in the water 38. is doing.

  Further, the buffer block 45 has a flow that allows the cooling water flowing from the cooling water pipe 41 into the buffer block 45 to flow out toward the rack 10 below the buffer block 45, that is, in the vicinity of the bottom surface 31 of the pit 30. A plurality of outlets 46 are provided. The outlet 46 is formed by a hole that penetrates the wall 21 that forms the buffer block 45. Furthermore, the buffer block 45 is formed with a communication hole 47 that allows the hollow portions 22 of the adjacent buffer blocks 45 to communicate with each other. The communication hole 47 is provided at a position below the buffer block 45, and is formed in the wall body 21 on the side of the adjacent buffer block 45 among the wall bodies 21. The communication holes 47 formed between the adjacent buffer blocks 45 are formed at positions facing each other. Thereby, the hollow portions 22 of the adjacent buffer blocks 45 communicate with each other through the communication holes 47 formed in the respective buffer blocks 45.

  FIG. 7 is a detailed view of part A of FIG. FIG. 8 is a detailed view of part B of FIG. In addition, the base plate 50 has an inlet 51 through which the cooling water flowing out from the outlet 46 formed in the buffer block 45 can flow into the base plate 50, and the cooling water flowing into the base plate 50 is supplied to the rack 10. And a supply port 52 that can be supplied to the fuel rod 5 accommodated in the container. Specifically, the inside of the base plate 50 is hollow, and the inside of the base plate 50 is formed as a hollow portion 53. A plurality of inflow ports 51 are formed on the side surface 54 of the base 50 formed in this way, which faces the buffer block 45, and communicates the outside of the base 50 with the inner cavity 53. The supply port 52 is formed on the upper surface 55 of the base plate 50, and communicates the outside of the upper surface 55 with the cavity 53. That is, since the rack 10 is disposed on the base plate 50, that is, on the upper surface 55 of the base plate 50, the supply port 52 is formed to face the rack 10. Further, a plurality of supply ports 52 are formed on the upper surface 55 of the base plate 50 and formed corresponding to the plurality of rack cells 11 included in the rack 10, and each supply port 52 is opposed to each rack cell 11. Is formed.

  Further, the rack 10 is provided with a saddle 58 formed by a plate that partitions the inside of the rack cell 11 in a portion near the base plate 50 inside the rack cell 11. The fuel rod 5 accommodated in the rack 10 is placed on the saddle 58. Thus, the saddle 58 provided at the lower end of the rack cell 11 is formed with a saddle hole 59 that is a hole penetrating the saddle 58. In the rack cell 11, the space on both sides of the saddle 58, that is, the space on the side where the fuel rod 5 is disposed, and the space on the platform 50 side communicate with each other through the saddle hole 59. Further, since the plurality of supply ports 52 formed in the base plate 50 are formed to face each rack cell 11, the supply ports 52 are supplied to the supply port 52 formed in the base plate 50 and the saddle 58 of the rack cell 11. The saddle hole 59 is opposed.

  The storage structure 40 according to the second embodiment is configured as described above, and the operation thereof will be described below. FIG. 9 is a schematic view showing the flow of water in the storage structure shown in FIG. 10 is a view taken along the line CC in FIG. In addition, the arrow in a figure has shown the rough direction of the flow of water. Cooling water flows into the cooling water pipe 41 that protrudes from the inner wall 32 of the pit 30 into the pit 30 and is provided in the buffer block 45. The water 38 stored in the pit 30 is absorbed from the water absorption pipe 43 and is temporarily sent out of the pit 30, and is cooled by a cooling device (not shown) provided outside the pit 30. The The water cooled by the cooling device flows out into the buffer block 45, that is, into the cavity 22 of the buffer block 45 from the pipe end portion 42, which is the tip portion of the cooling water pipe 41 provided inside the buffer block 45. Due to the inertia when flowing out from the water pipe 41 and the temperature difference between the water 38 in the buffer block 45 and the water 38 in the rack cell 11, it goes to the bottom of the pipe end 42, that is, toward the bottom surface 31 of the pit 30.

  A part of the cooling water directed downward from the pipe end 42 flows from the communication hole 47 formed in the buffer block 45 toward the adjacent buffer block 45 and flows into the adjacent block 45. In this way, a part of the cooling water flows through the communication hole 47 into the adjacent buffer block 45 one after another. In addition, the other cooling water of the cooling water directed downward of the pipe end 42 flows in the direction of the outlet 46 formed in the buffer block 45 and below the pipe end 42. It flows out of the buffer block 45 from the outlet 46 and is guided into the rack cell 11 through a saddle hole 59 that passes through the inlet 51, the supply port 52, and the saddle 58 of the base plate 50. Similarly, the cooling water that has flowed between the adjacent buffer blocks 45 through the communication hole 47 flows in the direction of the outlet 46 formed in the buffer block 45 and flows out of the buffer block 45 from the outlet 46. Then, it is led into the rack cell 11 through a saddle hole 59 that penetrates the inlet 51, the supply port 52, and the saddle 58 of the base 50.

  The cooling water that has flowed out of the buffer block 45 from the outlet 46 flows from the inlet 51 of the base 50 into the cavity 53 inside the base 50 located near the outlet 46. The cooling water that has flowed into the hollow portion 53 inside the base plate 50 from the inflow port 51 further flows out above the base plate 50 from a plurality of supply ports 52 formed in the upper surface 55 of the base plate 50, and the direction of the rack 10. Head for. In addition, the cooling water flowing out from the supply port 52 to the upper side of the base plate 50 is supplied into the rack cell 11, and the fuel rod 5 is arranged in the rack cell 11 from the saddle hole 59 formed at a position facing the supply port 52. It flows in the installed part. As a result, the cooling water is supplied to the portion of the rack 10 in which the fuel rod 5 is accommodated, the decay heat of the fuel rod 5 accommodated in the rack cell 11 is removed by the cooling water, and the fuel rod 5 is cooled. Cooled by.

  Cooling water whose temperature has been increased by cooling the fuel rod 5 and exchanging heat with the fuel rod 5, that is, water 38 flows upward in the pit 30. A water absorption pipe 43 capable of absorbing water 38 in the pit 30 is located above the rack 10 in the pit 30, and a pipe end portion 44, which is a tip, is located above the rack 10 in the pit 30. ing. For this reason, the temperature of the fuel rod 5 is increased by heat exchange, and the water 38 directed upward in the pit 30 is absorbed into the water absorption pipe 43 from the pipe end portion 44 of the water absorption pipe 43. The water 38 absorbed from the water absorption pipe 43 is cooled by a cooling device provided outside the pit 30 and returned as cooling water from the cooling water pipe 41 into the pit 30 again. In the cooling water returned from the cooling water pipe 41 into the pit 30, the water 38 near the rack 10 exchanges heat with the fuel rod 5 and is heated by the fuel rod 5 to rise above the rack 10 in the pit 30. Thus, the cooling water from the cooling water pipe 41 flows downward in the pit 30, is sucked into the water absorption pipe 43, is cooled again by the cooling device, and repeats circulation.

  That is, the water 38 in the pit 30 is heated when the water 38 in the pit 30 exchanges heat with the fuel rod 5 accommodated in the rack 10, flows above the rack 10, and is absorbed by the water absorption pipe 43. It is cooled by the cooling device, becomes cooling water, flows from the cooling water pipe 41 into the pit 30, and exchanges heat with the fuel rod 5 again. The water 38 in the pit 30 circulates while being repeatedly heated by the fuel rod 5 and cooled by the cooling device in this manner, thereby removing the decay heat of the fuel rod 5.

  In the above storage structure 40, the cooling water pipe 41 is provided inside the buffer block 45, and the outlet 46 is further formed in the buffer block 45. For this reason, since cooling water can be poured toward the rack 10, decay | disintegration heat can be removed efficiently. As a result, when the rack 10 contains the fuel rods 5 that need to be cooled, the fuel rods 5 can be cooled by the cooling water.

  In addition, the inlet 51 through which the cooling water can flow into the base 50 and the cooling water that has flowed into the base 50 can be supplied to the fuel rod 5 accommodated in the rack 50. Therefore, even when the rack 10 is disposed on the base plate 50, the fuel rod 5 can be cooled by the cooling water. As a result, the fuel rod 5 can be cooled more reliably.

  The buffer block 45 is provided with a plurality of outlets 46, and the base plate 50 is provided with a plurality of inlets 51 and a plurality of supply ports 52. The inflow ports 51 and the supply ports 52 may have the same size or different sizes. For example, since the cooling water easily flows into the outlet 46, the inlet 51, and the supply port 52 near the pipe end 42 of the cooling water pipe 41, the size of each hole is reduced and the pipe end of the cooling water pipe 41 is reduced. Since the cooling water hardly flows through the outlet 46, the inlet 51, and the supply port 52 that are formed at positions away from the portion 42, the size of each hole may be increased to facilitate the flow of the cooling water. In this way, by adjusting the sizes of the outlet 46, the inlet 51, and the supply port 52, the cooling water can be made to flow uniformly to the plurality of rack cells 11 and the fuel rods 5 can be uniformly cooled. Can do.

  The storage structure 60 according to the third embodiment has substantially the same configuration as the storage structure 1 according to the first embodiment, but is characterized in that the surface 63 of the buffer block 61 is formed to be uneven. Since other configurations are the same as those of the first embodiment, the description thereof is omitted and the same reference numerals are given. FIG. 11 is a schematic diagram of a storage structure according to the third embodiment of the present invention. In the storage structure 60 shown in the figure, the surface 63 of the wall body 62 forming the buffer block 61 is formed to be uneven. Further, the wall body 62 of the buffer block 61 has both a wall 63 located on the rack 10 side in the buffer block 61 and a wall body 62 located on the inner wall 65 side of the pit 30, both of which have an uneven surface 63. Is formed. Further, the inner wall 65 of the pit 30 is formed such that a portion of the inner wall 65 facing the buffer block 61 is uneven as in the wall body 62 of the buffer block 61.

  In addition, the unevenness | corrugation of the surface 63 of these buffer blocks 61 and the surface 66 of the inner wall 65 of the pit 30 may give a coating with rough surface roughness, and you may provide a dimple process and a rib. The unevenness of the surface 63 of the buffer block 61 and the surface 66 of the inner wall 65 of the pit 30 may be any shape as long as the friction coefficient is larger than that of the flat surface.

  The storage structure 60 according to the third embodiment is configured as described above, and the operation thereof will be described below. When vibration is transmitted to the rack 10 due to a large-scale earthquake or the like, due to the fluid resistance of the water stored in the pit 30 or the sliding frictional force between the base plate 15 and the bottom surface 31 of the pit 30. The vibration is damped. However, if it is difficult to attenuate the vibrations due to these, too much vibration is generated and the vibration is transmitted to the rack 10, the rack 10 together with the base 15 moves the pit 30 toward the buffer block 61. Move on the bottom surface 31. In this case, the water 38 interposed between the rack 10 and the buffer block 61 flows out from between the rack 10 and the buffer block 61, but the surface 63 of the buffer block 61 on the rack 10 side is formed uneven. ing. For this reason, this unevenness becomes a fluid resistance when the water 38 flows, so that the water 38 between the rack 10 and the buffer block 61 hardly flows out from between these. Accordingly, the vibration damping action by the water 38 is increased, and the vibration of the rack 10 is further alleviated by this damping action.

  In addition, when the rack 10 moves greatly without being able to stop the vibration of the rack 10 due to the damping action of the water 38, the rack 10 collides with the buffer block 61. When the rack 10 collides with the buffer block 61, the buffer block 61 moves in the direction of the inner wall 65 of the pit 30 by the energy at the time of the collision. In this case, the water 38 interposed between the buffer block 61 and the inner wall 65 of the pit 30 flows out from between these, but the surface 63 on the inner wall 65 side of the pit 30 in the buffer block 61 and the pit 30. A surface 66 of the inner wall 65 facing the buffer block 61 is formed to be uneven. For this reason, as in the case where the rack 10 approaches the buffer block 61, the unevenness becomes a fluid resistance, and the water 38 between the buffer block 61 and the inner wall 65 of the pit 30 does not easily flow out between these. Therefore, the buffer block 61 becomes difficult to move, and the buffer block 61 stops. Therefore, the buffer block 61 can be prevented from colliding with the inner wall 65 of the pit 30.

  In the above storage structure 60, the surface 63 of the buffer block 61 is formed to be uneven, so that the fluid resistance of the surface 63 of the buffer block 61 can be increased. Thus, when the rack 10 vibrates and approaches the buffer block 61, when the water 38 interposed between the rack 10 and the buffer block 61 flows out from between the rack 10 and the buffer block 61, the buffer block 61. Since the water flowing on the surface 63 is difficult to flow due to the fluid resistance of the surface 63, it is difficult to flow out between the rack 10 and the buffer block 61. For this reason, when the rack 10 vibrates, the vibration 38 can be more reliably damped by the water 38 interposed between the rack 10 and the buffer block 61. As a result, the collision between the rack 10 and the pit 30 can be more reliably suppressed.

  The storage structure 70 according to the fourth embodiment has substantially the same configuration as the storage structure 1 according to the first embodiment, but is characterized in that a buffer spring 72 is provided on the buffer block 71. Since other configurations are the same as those of the first embodiment, the description thereof is omitted and the same reference numerals are given. FIG. 12 is a schematic view of a storage structure according to the fourth embodiment of the present invention. The storage structure 70 shown in the figure includes a buffer spring 72 serving as a buffer means inside the buffer block 71, that is, in the cavity portion 22. The buffer spring 72 is formed by a compression spring connected to the wall body 21 on the inner wall 32 side of the pit 30 and the wall body 21 on the rack 10 side in the cavity portion 22. This is a compression spring capable of buffering the compression force in the direction in which the inner wall 32 and the rack 10 approach each other. Thereby, the buffer spring 72 is formed so as to be able to buffer the force in the direction in which the inner wall 32 of the pit 30 located on both sides of the buffer block 71 and the rack 10 approach each other.

  The storage structure 70 according to the fourth embodiment is configured as described above, and the operation thereof will be described below. When a large vibration is transmitted to the rack 10, the vibration is attenuated by the fluid resistance of the water 38 stored in the pit 30 and the sliding frictional force between the base plate 15 and the bottom surface 31 of the pit 30. If the vibration is even larger and it is difficult to dampen the vibration, the rack 10 moves on the bottom surface 31 of the pit 30 together with the base 15 in a direction approaching the buffer block 71.

  Thus, when the rack 10 collides with the buffer block 71 due to the rack 10 approaching the buffer block 71, the shock energy is received by the buffer block 71. This shock energy is also applied to the buffer spring 72. Communicated. Thus, the energy of impact at the time of the collision between the rack 10 and the buffer block 71 is also transmitted to the buffer spring 72, but the buffer spring 72 is formed by a compression spring. For this reason, when the force of the direction which the rack 10 and the buffer block 71 approach is applied, the buffer spring 72 can attenuate this force by compressing. Therefore, the energy of impact in this direction can be absorbed, and the impact when the rack 10 contacts the buffer block 71 is mitigated.

  In the storage structure 70 described above, since the buffer block 71 is provided with the buffer spring 72, when the rack 10 vibrates and collides with the buffer block 71, the buffer spring 72 can absorb the energy of the impact. Thereby, the vibration of the rack 10 can be more reliably mitigated, and the rack 10 that is moved by the vibration can be stopped. As a result, the collision between the rack 10 and the pit 30 can be more reliably suppressed.

  In the fourth embodiment, the buffer spring 72 is used as the buffer unit. However, a buffer unit other than the buffer spring 72 may be used. For example, a damper mechanism (not shown) that can attenuate the force in the compression direction may be used as the buffer means. Any buffering means other than the buffer spring 72 may be used as long as it can buffer the force in the direction in which the inner wall 32 of the pit 30 located on both sides of the buffer block 71 and the rack 10 approach each other.

  The storage structure 80 according to the fifth embodiment has substantially the same configuration as the storage structure 1 according to the first embodiment, but is characterized in that the height of the buffer block 81 is higher than the height of the rack 10. Since other configurations are the same as those of the first embodiment, the description thereof is omitted and the same reference numerals are given. FIG. 13 is a schematic view of a storage structure according to the fifth embodiment of the present invention. In the storage structure 80 shown in the figure, the height of the buffer block 81 is higher than the combined height of the rack 10 and the base plate 15. Specifically, the height of the buffer block 81 from the bottom surface 31 of the pit 30 to the buffer block upper end 82 that is the upper end of the buffer block 81 is from the bottom surface 31 of the pit 30 to the rack upper end 13 that is the upper end of the rack 10. It is higher than the height.

  The storage structure 80 according to the fifth embodiment is configured as described above, and the operation thereof will be described below. When a large vibration is transmitted to the rack 10, the vibration is attenuated by the fluid resistance of the water stored in the pit 30 and the sliding frictional force between the base plate 15 and the bottom surface 31 of the pit 30. When the vibration is difficult to attenuate due to these, the rack 10 moves on the bottom surface 31 of the pit 30 together with the base 15 in the direction approaching the buffer block 81. In this case, the water 38 interposed between the rack 10 and the buffer block 81 flows out from between the rack 10 and the buffer block 81, but the buffer block upper end 82 is higher than the rack upper end 13. Therefore, the water 38 flowing out between the rack 10 and the buffer block 81 flows only upward or in the direction of the rack 10. Therefore, since the direction in which the water 38 flows out between the rack 10 and the buffer block 81 is limited, the water 38 is difficult to flow. As a result, when the rack 10 approaches the buffer block 81, the fluid resistance of the water 38 interposed therebetween increases, so that the damping action by the water 38 increases, so that the vibration of the rack 10 is further alleviated. The

  In the storage structure 80 described above, since the height of the buffer block 81 is higher than the height of the rack 10, when the rack 10 vibrates and approaches the buffer block 81, the space between the rack 10 and the buffer block 81 is increased. When the intervening water 38 flows out from between the rack 10 and the buffer block 81, the water 38 can flow only upward or to the rack 10 side, so that it is difficult to flow out. For this reason, when the rack 10 vibrates, the vibration can be more reliably damped by the water 38 interposed between the rack 10 and the buffer block 81. As a result, the collision between the rack 10 and the pit 30 can be more reliably suppressed.

  Further, since the height of the buffer block 81 is higher than the height of the rack 10, the amount of water 38 interposed between the buffer block 81 and the inner wall 32 of the pit 30 is also increased. For this reason, even if the rack 10 collides with the buffer block 81, in order for the buffer block 81 to move toward the inner wall 32 of the pit 30 by the impact, it is necessary to push away a lot of water 38. For this reason, the energy of movement of the buffer block 81 in the direction of the inner wall 32 of the pit 30 is absorbed by the fluid resistance of the water 38 at that time. As a result, the collision between the buffer block 81 and the pit 30 can be more reliably suppressed.

  The storage structure 90 according to the sixth embodiment has substantially the same configuration as the storage structure 1 according to the first embodiment, but is characterized in that a buffer block side resistance plate 93 is provided in the buffer block 91. Since other configurations are the same as those of the first embodiment, the description thereof is omitted and the same reference numerals are given. FIG. 14 is a schematic view of a storage structure according to Embodiment 6 of the present invention. In the storage structure 90 shown in the figure, the buffer block 91 is provided with a buffer block side resistance plate 93 that is a buffer side resistance plate protruding upward between the buffer block 91 and the rack 10. That is, the buffer block 91 is provided with a buffer block side resistance plate 93 that is a buffer side resistance plate protruding in the rack 10 direction at a position where the height from the bottom surface 31 of the pit 30 is higher than the upper end of the rack 10. Yes.

  Thus, the buffer block 91 provided with the buffer block side resistance plate 93 is slightly higher in height from the bottom surface 31 of the pit 30 to the buffer block upper end 92 than from the bottom surface 31 of the pit 30 to the rack upper end 13. It is high. The buffer block side resistance plate 93 is provided at the buffer block upper end 92, protrudes in the direction of the rack 10, and the vicinity of the tip is located above the rack upper end 13. Accordingly, the buffer block side resistance plate 93 is positioned above the buffer block 91 and the rack 10. Further, in the buffer block side resistance plate 93, the portion located above the rack upper end 13 and the rack 10 are separated from each other.

  The storage structure 90 according to the sixth embodiment is configured as described above, and the operation thereof will be described below. When a large vibration is transmitted to the rack 10, the vibration is attenuated by the fluid resistance of the water 38 stored in the pit 30 and the sliding frictional force between the base plate 15 and the bottom surface 31 of the pit 30. If the vibration is even larger and it is difficult to dampen the vibration, the rack 10 moves on the bottom surface 31 of the pit 30 together with the base 15 in a direction approaching the buffer block 91. In this case, the water 38 interposed between the rack 10 and the buffer block 91 flows out from between the rack 10 and the buffer block 91, but since the bottom surface 31 of the pit 30 is located below, This water 38 mainly flows upward.

  Furthermore, since the buffer block side resistance plate 93 is provided above between the rack 10 and the buffer block 91, the flow of the water 38 is prevented from flowing upward, and the water 38 changes its flowing direction and is buffered. It flows between the block side resistance plate 93 and the rack 10. For this reason, the water 38 flowing out from between the rack 10 and the buffer block 91 flows out in the direction of the rack 10 through between the buffer block resistance plate 93 and the rack 10. Therefore, since the resistance when the water 38 between the rack 10 and the buffer block 91 flows out from both is increased, the water 38 interposed between the rack 10 when the rack 10 approaches the buffer block 91 is increased. Fluid resistance increases. For this reason, since the damping action by the water 38 is increased, the vibration of the rack 10 is further alleviated.

  Since the above storage structure 90 is provided with the buffer block side resistance plate 93 at a position higher than the rack upper end 13 in the buffer block 91, the rack 10 and the buffer block 91 are vibrated when the rack 10 vibrates and approaches the buffer block 91. When the water 38 interposed between the rack 91 and the buffer block 91 flows out between the rack 10 and the buffer block 91, the water 38 hardly flows out. For this reason, since the fluid resistance of the water 38 between the rack 10 and the buffer block 91 increases, the fluid damping effect can be increased, and when the rack 10 vibrates, the water 38 ensures more reliably. Vibration can be damped. As a result, the collision between the rack 10 and the pit 30 can be more reliably suppressed.

  The storage structure 100 according to the seventh embodiment has substantially the same configuration as the storage structure 40 according to the second embodiment, but is characterized in that a plurality of through holes 105 are formed in the wall body 102 of the buffer block 101. is there. Since other configurations are the same as those of the second embodiment, the description thereof is omitted and the same reference numerals are given. FIG. 15 is a schematic view of a storage structure according to Embodiment 7 of the present invention. FIG. 16 is a view taken along the line DD in FIG. In the storage structure 100 shown in the figure, a plurality of through holes 105, which are holes for communicating the surface 103 of the buffer block 101 and the cavity 104, are formed in the wall body 102 of the buffer block 101. Specifically, a plurality of through holes 105 are formed in the wall body 102 located on the rack 10 side and the wall body 102 located on the inner wall 32 side of the pit 30 among the wall bodies 102 of the buffer block 101. Yes. As a result, the through hole 105 formed in the wall body 102 located on the rack 10 side communicates the surface 103 of the wall body 102 located on the rack 10 side and the cavity 104, and the inner wall 32 side of the pit 30. The through-hole 105 formed in the wall body 102 located at the position connects the surface 103 of the wall body 102 located on the inner wall 32 side of the pit 30 and the cavity 104. The through hole 105 has a diameter in the range of 5 cm to 10 cm.

  Further, in this buffer block 101, similarly to the buffer block 45 of the storage structure 40 according to the second embodiment, a cooling water pipe 107 protruding into the pit 30 from the inner wall 32 at a position above the buffer block 101 is provided with the buffer block 101. It enters into the block 101 and is provided in the buffer block 101. Further, the cooling water pipe 107 of the storage structure 100 according to the seventh embodiment is longer in the buffer block 101 than the cooling water pipe 41 of the storage structure 40 according to the second embodiment, and the pipe end portion 108 is. Is located below, and the pipe end portion 108 is located near the bottom surface 31 of the pit 30. Further, in the buffer block 101, an outlet 46 is formed below the buffer block 101, similarly to the buffer block 45 of the storage structure 40 according to the second embodiment.

  The storage structure 100 according to the seventh embodiment is configured as described above, and the operation thereof will be described below. When vibration is transmitted to the rack 10 due to a large-scale earthquake or the like, the vibration is attenuated by the fluid resistance of the water 38 stored in the pit 30 and the sliding frictional force between the base plate 50 and the bottom surface 31 of the pit 30. However, when the vibration is large and it is difficult to attenuate the vibration, the rack 10 moves on the bottom surface 31 of the pit 30 in the direction approaching the buffer block 101 together with the base plate 50. In this case, the water 38 interposed between the rack 10 and the buffer block 101 flows out from between the rack 10 and the buffer block 101, but the water 38 is formed in a plurality of penetrating holes formed in the buffer block 101. It also flows into the hole 105. For this reason, pressure loss occurs, and the fluid resistance of the water 38 increases. Accordingly, when the rack 10 approaches the buffer block 101, the damping action by the water 38 interposed therebetween is increased, so that the vibration of the rack 10 is further alleviated.

  Further, since the pipe end portion 108 of the cooling water pipe 107 is positioned below in the buffer block 101, the pipe end portion 108 is positioned in the vicinity of the outlet 46 formed in the buffer block 101. . Therefore, the cooling water that has flowed from the cooling water pipe 107 to the buffer block 101 easily flows out from the outlet 46, and the cooling water that has flowed out from the outlet 46 flows in the direction of the base plate 50, and further the rack 10 Then, the fuel rod 5 (see FIG. 5) accommodated in the rack 10 is cooled.

  In the storage structure 100 described above, since the plurality of through holes 105 are formed in the buffer block 101, the rack 10 vibrates and approaches the buffer block 101, and the water 38 interposed between the rack 10 and the buffer block 101 exists. When flowing out from between these, the water 38 also flows into the plurality of through holes 105 of the buffer block 101. As described above, when the water 38 flows through the through hole 105, a pressure loss occurs. However, since the plurality of through holes 105 are formed, the pressure loss is further increased. For this reason, the fluid resistance of the water 38 becomes large, and the water 38 becomes difficult to flow. Therefore, when the rack 10 vibrates, the vibration can be more reliably damped by the water 38 interposed between the rack 10 and the buffer block 101. As a result, the collision between the rack 10 and the pit 30 can be more reliably suppressed.

  Further, since the pipe end portion 108 of the cooling water pipe 107 is positioned below in the buffer block 101 and the pipe end portion 108 is positioned in the vicinity of the outlet 46, the cooling water pipe 107 and the buffer block 101 are disposed inside. The cooling water that has flowed to the base plate 50 does not flow out from the through hole 105 formed in the wall body 102 of the buffer block 101, but flows out from the outlet 46 toward the base 50. As a result, even when the plurality of through holes 105 are formed in the buffer block 101, the cooling water that has flowed into the buffer block 101 can be flowed toward the base plate 50 to cool the fuel rod 5. As a result, it is possible to achieve both attenuation of vibration of the rack 10 by forming the through hole 105 in the buffer block 101 and cooling of the fuel rod 5 by flowing cooling water into the buffer block 101.

  The storage structure 110 according to the eighth embodiment has substantially the same configuration as the storage structure 40 according to the second embodiment, but is characterized in that the upper end of the cavity 113 of the buffer block 111 is closed. Since other configurations are the same as those of the second embodiment, the description thereof is omitted and the same reference numerals are given. FIG. 17 is a schematic diagram of a storage structure according to the eighth embodiment of the present invention. In the storage structure 110 shown in the figure, the upper end of the cavity 113 formed inside the buffer block 111 is closed. That is, a closing portion 114 that closes the cavity portion 113 is formed at the upper end of the cavity portion 113 partitioned by the wall body 112 of the buffer block 111. The closing portion 114 is formed in a substantially rectangular plate shape, and the cavity 113 is closed by connecting the periphery to the wall body 112. Further, in the storage structure 110 according to the eighth embodiment, the cooling water pipe 107 having a longer length in the buffer block 111 is provided as in the storage structure 100 according to the seventh embodiment. The cooling water pipe 107 penetrates the blocking portion 114 and enters the buffer block 111, that is, the hollow portion 113 from above the buffer block 111.

  The storage structure 110 according to the eighth embodiment is configured as described above, and the operation thereof will be described below. When vibration is transmitted to the rack 10 due to a large-scale earthquake or the like, the vibration is attenuated by the fluid resistance of the water 38 stored in the pit 30 and the sliding frictional force between the base plate 50 and the bottom surface 31 of the pit 30. However, if the vibration is large and it is difficult to attenuate the vibration, the rack 10 moves on the bottom surface 31 of the pit 30 in the direction approaching the buffer block 111 together with the base plate 50. As described above, when the rack 10 comes close to the buffer block 111 and the rack 10 collides with the buffer block 111, the shock energy is received by the buffer block 111, but the buffer block 111 is provided with the closing portion 114. It has been. Thereby, the buffer block 111 can absorb impact energy at the time of collision.

  Further, since the upper end of the cavity 113 is closed by the closing portion 114, the cooling water that has flowed into the buffer block 111 from the cooling water pipe 107 does not flow out from the upper end of the buffer block 111, and the outlet The fuel rod 5 (see FIG. 5) flows out from 46 toward the base 50, flows from the base 50 to the rack 10, and is accommodated in the rack 10. Further, the hollow portions 113 of all the buffer blocks 111 disposed around the inner wall 32 of the pit 30 are communicated by the communication holes 47 disposed in the side wall of the wall body 112 of the buffer block 111, and some The cooling water flows out from the outlet 46 of each buffer block 111 toward the base 50, flows from the base 50 to the rack 10, and cools the fuel rod 5 accommodated in the rack 10.

  In the storage structure 110 described above, since the buffer block 111 is closed at the upper end of the cavity 113, it is possible to ensure adequate rigidity while forming the cavity 113. As a result, when the rack 10 vibrates and collides with the buffer block 111, a larger impact energy can be absorbed by the buffer block 111. Further, by closing the upper end of the cavity 113, when the cooling water pipe 107 is provided in the buffer block 111 and the cooling water is allowed to flow, the cooling water can flow out only from the outlet 46. It is possible to flow more reliably toward the rack 10 and to improve the cooling performance. As a result, when the rack 10 accommodates the fuel rods 5 that need to be cooled, the fuel rods 5 can be more reliably cooled by the cooling water.

  FIG. 18 is a schematic diagram illustrating a modified example of the storage structure according to the fifth embodiment. In the storage structure 80 according to the fifth embodiment, the height of the buffer block 81 is set higher than the height of the rack 10, thereby increasing the fluid resistance of the water 38 and the rack 10, the buffer block 81, and the buffer block 81. However, it may be formed so that the fluid resistance of the water 38 is further increased. For example, as shown in FIG. 18, the buffer block side resistor plate 120 may be provided in the buffer block 81 in the same manner as the buffer block side resistor plate 93 provided in the buffer block 91 of the storage structure 90 according to the sixth embodiment. Good. The buffer block side resistance plate 120 is provided in the buffer block 81 at a portion where the height from the bottom surface 31 of the pit 30 is higher than the height from the bottom surface 31 of the pit 30 to the rack upper end 13. Protruding.

  Thus, when the height of the buffer block 81 is higher than the rack upper end 13, the buffer block 81 is provided with the buffer block-side resistance plate 120, so that the water when the buffer block 81 approaches the inner wall 32 of the pit 30. The fluid resistance of the water 38 when the rack 10 approaches the buffer block 81 can be more reliably increased while the fluid resistance of 38 is maintained. As a result, the collision between the buffer block 81 and the pit 30 can be more reliably suppressed, and the collision between the rack 10 and the pit 30 can be more reliably suppressed. When the buffer block side resistor plate 120 is provided in the buffer block 81 as described above, the buffer block side resistor plate 120 is formed in such a size that the tip in the rack 10 direction is not positioned above the rack 10. Is preferred. Thereby, even when the rack 10 is moved by vibration and approaches the buffer block 81, the buffer block side resistance plate 120 does not take much above the rack 10, so that the fuel rod 5 can be taken out from the rack 10. .

  FIG. 19 is a schematic diagram illustrating a modified example of the storage structure according to the sixth embodiment. In the storage structure 90 according to the sixth embodiment, the buffer block 91 is provided with the buffer block side resistance plate 93 to increase the fluid resistance of the water 38 between the buffer block 91 and the rack 10. A resistance plate similar to the buffer block side resistance plate 93 is provided above the inner wall 32 and the buffer block 91 to increase the fluid resistance of the water 38 between the inner wall 32 of the pit 30 and the buffer block 91. Also good. For example, as shown in FIG. 19, the inner wall 32 of the pit 30 is provided with an inner wall side resistance plate 121 protruding in the direction of the buffer block 91 at a position where the height from the bottom surface 31 of the pit 30 is higher than the upper end 92 of the buffer block. May be.

  The inner wall side resistance plate 121 thus protrudes in the direction of the buffer block 91 from the inner wall 32 of the pit 30 at a position higher than the buffer block upper end 92, and the vicinity of the tip is located above the buffer block upper end 92. ing. Accordingly, the inner wall side resistance plate 121 is located above the inner wall 32 of the pit 30 and the buffer block 91. In addition, the portion of the inner wall side resistor plate 121 located above the upper end 92 of the buffer block is separated from the buffer block 91.

  An inner wall side resistance plate 121 is provided at a position higher than the upper end 92 of the buffer block in the inner wall 32 of the pit 30. For this reason, the rack 10 vibrates and collides with the buffer block 91, and the buffer block 91 moves together with the rack 10 to approach the inner wall 32 of the pit 30, thereby interposing between the inner wall 32 of the pit 30 and the buffer block 91. When the flowing water 38 flows out from between the inner wall 32 and the buffer block 91, the water 38 becomes difficult to flow out. For this reason, since the fluid resistance of the water 38 between the inner wall 32 of the pit 30 and the buffer block 91 increases, the fluid damping effect can be increased, and when the rack 10 vibrates and collides with the buffer block 91. The water 38 can relax the movement of the buffer block 91 more reliably. As a result, the collision between the buffer block 91 and the pit 30 can be more reliably suppressed.

  The inner wall side resistor plate 121 may be provided on the inner wall 32 of the pit 30 without providing the buffer block side resistor plate 93 in the buffer block 91. Even when the inner wall side resistance plate 121 is provided without providing the buffer block side resistance plate 93, the fluid resistance when the water 38 interposed between the inner wall 32 of the pit 30 and the buffer block 91 flows out is increased. Can do. Thereby, even when the rack 10 collides with the buffer block 91, the buffer block 91 can be stopped by the fluid resistance of the water 38, and the buffer block 91 and the inner wall 32 of the pit 30 can be prevented from contacting each other.

  FIG. 20 is a schematic diagram illustrating a modified example of the storage structure according to the sixth embodiment. In the storage structure 90 according to the sixth embodiment, since the fluid resistance of the water 38 between the buffer block 91 and the rack 10 is increased, the buffer block side resistance plate 93 is provided in the buffer block 91. When increasing the fluid resistance of the water 38 between the block 91 and the rack 10, a resistance plate may be provided in the rack 10. For example, as shown in FIG. 20, the rack 10 may be provided with a rack-side resistance plate 122 protruding in the direction of the buffer block 91 at a position where the height from the bottom surface 31 of the pit 30 is higher than the buffer block upper end 92. .

  When the rack-side resistance plate 122 is provided in this way, the rack 10 or the buffer block is configured such that the height from the bottom surface 31 of the pit 30 to the upper end of the rack is higher than the height from the bottom surface 31 of the pit 30 to the upper end 92 of the buffer block. 91, and the rack side resistance plate 122 is provided on the rack upper end 13 of the rack 10 so as to protrude in the direction of the buffer block 91. Thereby, since the fluid resistance of the water 38 located between the rack 10 and the buffer block 91 when the rack 10 approaches the buffer block 91 can be increased, the fluid damping effect can be increased. Therefore, when the rack 10 vibrates, the water 38 can more reliably attenuate the vibration, and more reliably suppress the collision between the rack 10 and the pit 30.

  FIG. 21 is a schematic diagram illustrating a modified example of the storage structure according to the fifth embodiment. In the fifth embodiment, the height from the bottom surface 31 of the pit 30 is higher in the buffer block 82 than in the rack 10, but the rack-side resistance plate 122 is provided in the rack 10 when formed in this way. May be. For example, as shown in FIG. 21, the height from the bottom surface 31 of the pit 30 to the upper end 82 of the buffer block is higher than the height from the bottom surface 31 of the pit 30 to the upper end 13 of the rack. 13 is provided with a rack side resistance plate 122 protruding in the direction of the buffer block 81. Further, the buffer block 81 has a rack side resistance plate 122 at a position on the surface of the rack side 10 that is substantially the same as the height at which the rack side resistance plate 122 is provided from the bottom surface 31 of the pit 30. The resistance plate relief portion 123 is formed as a relief portion formed to be recessed in a direction away from the resistance plate. The resistance plate escape portion 123 has a width in the height direction from the bottom surface 31 of the pit 30 that is wider than the thickness of the rack side resistance plate 122 in the same direction, and the resistance plate in the protruding direction of the rack side resistance plate 122. The depth of the escape portion 123 is deeper than the protruding amount of the rack-side resistance plate 122 from the rack 10 in the same direction. Although illustration is omitted, as a modification of FIG. 21, the rack-side resistor plate 122 can be installed on the side wall of the rack 10. In this case, the resistance plate escape portion 123 of the buffer block 81 is also installed at the same height as the rack side resistance plate 122.

  Thus, by providing the rack-side resistance plate 122 in the rack 10, the fluid resistance of the water 38 positioned between the rack 10 and the buffer block 81 can be increased. The vibration can be damped more reliably by 38. As a result, the collision between the rack 10 and the pit 30 can be more reliably suppressed. Further, by forming the resistance plate escape portion 122 in the buffer block 81, when the rack 10 vibrates and approaches the buffer block 81, the rack-side resistance plate 122 enters the resistance plate escape portion 123. It can suppress that the part 123 and the buffer block 81 collide. As a result, even when the rack 10 moves when a large vibration is generated, the resistance plate escape portion 123 and the buffer block 81 can be prevented from colliding and being damaged.

  22 and 23 are schematic diagrams illustrating modifications of the storage structure according to the fifth embodiment. In addition, when the height of the buffer block 81 is higher than the height of the rack 10, the rack side resistor plate 122 may be provided on the rack 10 and the buffer block side resistor plate 120 may be provided on the buffer block 81. For example, as shown in FIG. 22, the rack 10 is provided with a rack-side resistor plate 122 that protrudes in the direction of the buffer block 81 at the rack upper end 13. Further, the buffer block 81 may be provided with a buffer block side resistance plate 120 at a position where the height from the bottom surface 31 of the pit 30 is higher than the height from the bottom surface 31 of the pit 30 to the rack side resistance plate 122. . Thereby, the buffer block side resistance plate 120 is provided above the rack side resistance plate 122 so as to be spaced apart.

  Thus, by providing the buffer block side resistance plate 120 and the rack side resistance plate 122, when the rack 10 vibrates and moves in the direction of the buffer block 81, it is located between the rack 10 and the buffer block 81. When the water 38 flows upward, the flow path through which the water 38 flows becomes complicated, so that the water 38 is difficult to escape. That is, when the water 38 located between the rack 10 and the buffer block 81 flows upward, the water is first blocked by the rack-side resistor plate 122 and passes between the rack-side resistor plate 122 and the buffer block 81. Furthermore, the buffer block side resistor plate 120 is blocked and flows out between the buffer block side resistor plate 120 and the rack side resistor plate 122. For this reason, since the water 38 between the rack 10 and the buffer block 81 can increase the fluid resistance when flowing out from between the both, the fluid damping effect can be increased. Therefore, when the rack 10 vibrates, the water 38 can more reliably attenuate the vibration, and more reliably suppress the collision between the rack 10 and the pit 30.

  Further, when the buffer block side resistance plate 120 and the rack side resistance plate 122 are provided in this way, a resistance plate escape portion 123 may be further formed in the buffer block 81 as shown in FIG. As a result, when the rack 10 approaches the buffer block 81 due to a large vibration, the rack-side resistor plate 122 enters the resistor plate escape portion 123, and therefore, the rack plate resistor plate 122 and the buffer block 81 are prevented from colliding with each other. it can. As a result, it is possible to suppress damage between the resistance plate escape portion 123 and the buffer block 81 while more reliably suppressing the collision between the rack 10 and the pit 30.

  FIG. 24 is a schematic diagram illustrating a modified example of the storage structure according to the second embodiment. In the case where the cooling water pipe is provided and the cooling water is allowed to flow into the pit 30, in the storage structure 40 according to the second embodiment, the pipe end 42 of the cooling water pipe 41 is connected to the buffer block 45 as illustrated in FIG. 5. If the cooling water discharge flow is not fast and there is no fear that the fuel assembly 7 may be shaken by the cooling water discharge flow, the pipe end 42 of the cooling water pipe 41 is placed in the cavity 22. The pipe end 42 of the cooling water pipe 41 may not be positioned in the buffer block 45 because it is not necessarily inserted into the cavity 22 inside the buffer block 45. For example, as shown in FIG. 24, the cooling water pipe 125 has all parts positioned above the buffer block 45, and the pipe end 126 of the cooling water pipe 125 is also positioned above the buffer block 45, The buffer block 45 may have a structure in which the cooling water pipe 125 is not provided. As a result, even if a large vibration is generated and the rack 10 vibrates and the rack 10 collides with the buffer block 45 and the buffer block 45 moves, the cooling water pipe 125 is not located in the buffer block 45. Further, it is possible to suppress the collision between the buffer block 45 and the cooling water pipe 125 inside the buffer block 45. As a result, damage to the buffer block 45 and the cooling water pipe 125 can be suppressed.

  Even when the cooling water pipe 125 is positioned above the buffer block 45 in this way, the cooling water that has flowed from the cooling water pipe 125 into the pit 30 is the water 38 in the pit 30. Since the temperature is lower than that, the water flows downward in the pit 30 due to a temperature difference from the water 38 in the pit 30. For this reason, since this cooling water flows into the buffer block 45 located below the pipe end portion 126 of the cooling water pipe 125, as with the storage structure 40 according to the second embodiment, from the circulation port 46 of the buffer block 45. It flows out in the direction of the base plate 50. Further, the cooling water is heated by exchanging heat with the fuel rods 5 accommodated in the rack 30, and flows above the rack 30. Thereafter, the water 38 heated by exchanging heat with the fuel rods 5 is absorbed by a water absorption pipe 43 provided above the rack 10 and is cooled by a cooling device, and becomes cooling water to be pits from the cooling water pipe 125. The heat is exchanged with the fuel rod 5 again. Thus, even when all parts of the cooling water pipe 125 are located above the buffer block 45, the water 38 in the pit 30 is heated by the fuel rod 5 and cooled by the cooling device. It circulates repeatedly. Thereby, the fuel rod 5 can be cooled more reliably.

  FIG. 25 is a schematic diagram illustrating a modified example of the storage structure according to the second embodiment. In the above description and illustration, the inner wall 32 of the pit 30 and the buffer block are separated from each other, but it is not always necessary to separate the inner wall 32 of the pit 30 from the buffer block. For example, as an example of this, as a modification of the storage structure 40 according to the second embodiment, the buffer block 45 may be disposed in contact with the inner wall 32 of the pit 30 as shown in FIG. Even if the buffer block 45 and the inner wall 32 of the pit 30 are not separated from each other, the fluid resistance of the water 38 positioned between the rack 10 and the buffer block 45 is increased by providing the buffer block 45 around the rack 10. Therefore, the vibration of the rack 10 can be reduced when a large vibration is generated. Further, by providing a buffer block 45 between the rack 10 and the inner wall 32 of the pit 30, even if the rack 10 moves more than expected due to unexpected vibration, the rack 10 collides with the buffer block 45. The vibration of the rack 10 is absorbed by the buffer block 45 when it collides with the buffer block 45, and the vibration stops. As a result, the collision between the rack 10 and the pit 30 can be suppressed. When the cooling water pipe 41 is positioned in the buffer block 45, the buffer block 45 does not move even if the rack 10 collides with the buffer block 45. Damage can be suppressed. In this case, the inner wall side resistance plate 121 is not required in the embodiment of FIG.

  Further, the resistance force due to the liquid between the buffer and the inner wall of the storage container is such that the rack 10 or the buffer blocks 20, 45, 61, 71, 81, 91, 101, 111 and the various resistance plates 93, 120, The required resistance can be obtained by appropriately selecting the dimensions of the gaps 121 and 122.

  FIG. 26 is a schematic diagram illustrating a modified example of the storage structure according to the second embodiment. In the above description, the platform is disposed on the bottom surface of the pit. However, a protective member may be provided between the platform and the bottom surface of the pit. For example, as a modified example of the storage structure 40 according to the second embodiment, as shown in FIG. 26, a liner 128 as a protective member is disposed on the bottom surface 31 of the pit 30 as shown in FIG. , May be disposed on the liner 128. That is, the liner 128 may be disposed between the bottom surface 31 of the pit 30 and the base plate 50. The liner 128 is disposed on the bottom surface 31 of the pit 30 and in the entire range surrounded by the plurality of buffer blocks 45 disposed around the rack 10, and the liner 128 and the buffer block 45 are coupled. Regardless of the presence or absence, results equivalent to those of various embodiments can be obtained. If the liner 128 is provided, the bottom surface 31 of the pit 30 or a lining (not shown) made of a thin plate laid on the bottom surface 31 of the pit 30 can be protected or reinforced.

  As described above, the liner 128 is disposed on the bottom surface 31 of the pit 30, and the platform 50 is disposed on the liner 128, so that a large vibration is generated and the rack 10 and the platform 50 are integrated. In the case of movement, the base plate 50 moves on the liner 128. Thereby, damage to the bottom surface 31 of the pit 30 that occurs when the base plate 50 moves while sliding on the bottom surface 31 of the pit 30 can be suppressed, and the bottom surface 31 of the pit 30 can be protected. In addition, when the base plate 50 moves together with the rack 10 when a large vibration occurs, the base plate 50 moves on the liner 128, so that the base plate 50 is damaged due to the sliding movement. If this occurs, the liner 128 is damaged. For this reason, when repairing a damaged part due to the movement of the base plate 50, only the liner 128 needs to be replaced, so that the cost for repair can be reduced. When the liner 128 is laid all over the site surrounded by the buffer block 45, the rack 10 and the base plate 50 move on the liner 128 and are laid on the bottom surface 31 of the pit 30 or the bottom surface 31 of the pit 30. It is possible to protect the lining made of thin plates. The liner 128 may be extended and laid down below the buffer block 45.

  Moreover, although the case where the water 38 was used as an example of the liquid stored in the pit 30 was described in the storage structure described above, the liquid stored in the pit 30 may be other than the water 38. The liquid stored in the pit 30 may be a liquid other than the water 38 as long as the vibration of the rack 10 can be attenuated by the fluid resistance. Moreover, each said Example and modification are not limited to said structure, You may combine each. That is, for example, the buffer block 20 of the storage structure 1 according to the first embodiment may be arranged in contact with the inner wall 32 of the pit 30 as in the modification shown in FIG. The storage structure 1 may be provided with a liner 128 as in the modification shown in FIG. You may combine the structure mentioned above as needed.

  As described above, the storage structure according to the present invention is useful for suppressing problems caused by vibration, and is particularly suitable for storing stored items that require cooling.

It is a perspective view which shows the fuel assembly and square tube which are stored by the storage structure which concerns on Example 1 of this invention. It is sectional drawing of the storage structure which concerns on Example 1 of this invention. It is a perspective view of the storage structure shown in FIG. It is a figure which shows the test result at the time of performing a seismic-wave excitation test in the storage structure which concerns on FIG. It is sectional drawing of the storage structure which concerns on Example 2 of this invention. It is a perspective view of the storage structure shown in FIG. FIG. 6 is a detailed view of part A in FIG. 5. FIG. 8 is a detailed view of part B in FIG. 7. It is the schematic which shows the flow of the water of the storage structure shown in FIG. It is CC arrow line view of FIG. It is the schematic of the storage structure which concerns on Example 3 of this invention. It is the schematic of the storage structure which concerns on Example 4 of this invention. It is the schematic of the storage structure which concerns on Example 5 of this invention. It is the schematic of the storage structure based on Example 6 of this invention. It is the schematic of the storage structure which concerns on Example 7 of this invention. It is DD arrow line view of FIG. It is the schematic of the storage structure which concerns on Example 8 of this invention. FIG. 10 is a schematic diagram illustrating a modified example of the storage structure according to the fifth embodiment. It is the schematic which shows the modification of the storage structure which concerns on Example 6. FIG. It is the schematic which shows the modification of the storage structure which concerns on Example 6. FIG. FIG. 10 is a schematic diagram illustrating a modified example of the storage structure according to the fifth embodiment. FIG. 10 is a schematic diagram illustrating a modified example of the storage structure according to the fifth embodiment. FIG. 10 is a schematic diagram illustrating a modified example of the storage structure according to the fifth embodiment. FIG. 10 is a schematic diagram illustrating a modified example of the storage structure according to the second embodiment. FIG. 10 is a schematic diagram illustrating a modified example of the storage structure according to the second embodiment. FIG. 10 is a schematic diagram illustrating a modified example of the storage structure according to the second embodiment.

Explanation of symbols

1, 40, 60, 70, 80, 90, 100, 110 Storage structure 3 In-air response level 4 Underwater response level 5 Fuel rod 6 Support grid 7 Fuel assembly 10 Rack (fuel storage rack)
11 Rack cell 12 Enclosure 13 Rack upper end 15, 50 Base 20, 45, 61, 71, 81, 91, 101, 111 Buffer block 21, 62, 102, 112 Wall 22, 104, 113 Cavity 23 Rib 30 Pit (Fuel storage facility)
31 Bottom surface 32, 65 Inner wall 35 Underwater illuminator 36 Lighting support member 38 Water 41, 107, 125 Cooling water pipes 42, 108, 126 Pipe end 43 Water absorption pipe 44 Pipe end 46 Outlet 47 Communication hole 51 Inlet 52 Supply Port 53 Hollow portion 54 Side surface 55 Upper surface 58 Saddle 59 Saddle hole 63, 103 Surface 66 Surface 72 Buffer spring 82, 92 Buffer block upper end 93, 120 Buffer block side resistor plate 105 Through hole 114 Blocking portion 121 Inner wall side resistor plate 122 Rack side Resistance plate 123 Resistance plate relief 128 Liner

Claims (12)

Containment for storing stored items,
A storage container that is provided so as to be able to store a liquid and that stores the contents in the liquid;
A buffer provided in the liquid stored in the storage container and spaced from the inner wall of the storage container and the container, and disposed between the inner wall and the container;
A storage structure characterized by comprising:   The storage structure according to claim 1, wherein the buffer body is disposed in the storage container without being fixed to the storage container.   The storage structure according to claim 1, wherein the buffer body is formed with an uneven surface.   The said buffer body is provided with the buffer means which can buffer the force of the direction in which the inner wall of the said storage container located in the both sides of the said buffer body, and the said stored object approach. The storage structure according to any one of the above items.   The height of the buffer body from the bottom surface of the storage container to the upper end of the buffer body is higher than the height from the bottom surface of the storage container to the upper end of the storage object. The storage structure according to any one of -4.   The buffer body is provided with a buffer-side resistor plate that protrudes in the direction of the container at a position where the height from the bottom surface of the storage container is higher than the upper end of the container. The storage structure according to any one of 1 to 5.   The inner wall of the storage container is provided with an inner wall side resistance plate protruding in the direction of the buffer body at a position where the height from the bottom surface of the storage container is higher than the upper end of the buffer body. The storage structure according to any one of claims 1 to 6.   The buffer includes a wall that forms a surface of the buffer, and a cavity defined by the wall is formed inside the buffer. The storage structure according to any one of the above.   The storage structure according to claim 8, wherein a plurality of through holes, which are holes communicating the surface and the cavity, are formed in the wall body.   The storage structure according to claim 8 or 9, wherein an upper end of the hollow portion of the buffer is closed.   The buffer body is provided with a cooling passage through which a cooling medium capable of cooling the stored item flows, and an outlet port through which the cooling medium can flow out is formed in the direction of the accommodation. The storage structure according to any one of claims 1 to 10. The container is provided on a base plate disposed in the storage container,
The base plate includes an inflow port through which the cooling medium flowing out from the outflow port formed in the buffer body can flow into the base plate, and the cooling medium flowing into the base plate into the accommodation. The storage structure according to claim 11, wherein a supply port capable of supplying the stored material stored in the storage is formed.

Images