JP6715789B2 - Spent fuel storage facility - Google Patents

Description

The present invention comprises a spent fuel storage pit in which water is stored, and a spent fuel storage rack installed in the spent fuel storage pit for accommodating an assembly of spent nuclear fuel. Related to a spent fuel storage facility, in particular, a spent fuel storage facility for suppressing movement of the spent fuel storage rack in the spent fuel storage pit by utilizing resistance of the water stored in the pit Regarding

For example, spent nuclear fuel (spent nuclear fuel rods) generated in a nuclear power plant is accommodated in a vertical cell of a spent fuel storage rack in a state of being accommodated in a rectangular tube as a nuclear fuel assembly, and the spent fuel storage rack is further stored. It is stored and stored by being installed in the spent fuel storage pit where water is stored inside. The spent fuel storage pit may be referred to as a spent fuel pool.

Conventionally, a spent fuel storage rack (hereinafter, may be abbreviated as “storage rack”) is a sidewall or a bottom surface of a spent fuel storage pit (hereinafter, may be abbreviated as “storage pit”) via a support. It is fixed to. However, when the storage rack is fixedly installed in the storage pit in this way, the support load may increase and the storage rack may not be supported when a large earthquake occurs.

Therefore, for example, by using the device disclosed in Patent Document 1, by placing the storage rack on the floor surface (in this case, the bottom surface of the storage pit) via the sliding member, A method of storing without fixing has been proposed. In the fuel storage facility that stores the storage rack without fixing it to the side wall or bottom of the storage pit, the storage rack is slidably mounted on the bottom of the storage pit and moves horizontally when an earthquake occurs. The movement of the storage rack is suppressed by the resistance of the water stored in the storage pit.

By supporting the storage rack in a movable state without fixing it to the storage pit, the stress generated in the storage rack is reduced as compared with the structure in which the storage rack is fixed to the storage pit when an earthquake or the like occurs. be able to.

JP 2002-70945A

However, as described above, when the storage rack is installed in the storage pit so as to be slidable in the horizontal direction and the movement of the storage rack in the event of an earthquake is suppressed by the resistance of water in the storage pit, the following problems occur. Occurs.

With respect to seismic motion at the acceleration level expected in the design, a sufficient distance can be secured between the storage rack and the wall of the storage pit, so even if the storage rack moves due to the shaking of the earthquake, the storage rack will not move. It is sufficiently suppressed by the resistance of water in the storage pit, and the storage rack does not collide with the pit wall surface. However, if a very large earthquake that exceeds the design assumption occurs, the storage rack may collide with the storage pit wall surface. Although the collision of the storage rack with the wall surface of the storage pit is mild, it is feared that the storage rack or the storage pit may be damaged.

The present invention has been made to solve the above problems, and in a spent fuel storage facility that suppresses the movement of a spent fuel storage rack by utilizing the resistance of water stored in a storage pit, An object of the present invention is to provide a spent fuel storage facility capable of further enhancing the rack movement suppressing effect.

In order to solve the above problems, the present invention employs the following means.
That is, the spent fuel storage facility according to one aspect of the present invention is configured to have a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface, and the spent fuel storage pit in which water is stored therein is provided. And a spent fuel storage rack movably installed in the water in the spent fuel storage pit for containing an assembly of spent nuclear fuel, with respect to the bottom surface of the spent fuel storage pit, A water flow suppressing member that is provided on the inner wall of the spent fuel storage pit or in the vicinity thereof, and that suppresses the flow of the water caused by the spent fuel storage rack moving in water in the spent storage pit , The water flow restraint member is a plurality of fin-shaped members protruding from the inner wall of the spent fuel storage pit or the vicinity thereof toward the inside of the spent fuel storage pit and extending in a substantially horizontal longitudinal direction. The fin-shaped member projects so that the tip of the fin-shaped member faces downward with respect to the horizontal .

According to this configuration, when the spent fuel storage rack placed in the spent fuel storage pit moves in the storage pit due to an earthquake or the like, the water flow generated in the pit due to this movement, that is, the moving storage rack, The movement of the displaced water is suppressed by the water flow suppressing member. Therefore, it is possible to increase the resistance of water that suppresses the movement of the storage rack.
Further, according to the configuration, the water flow generated by the movement of the storage rack, particularly the water flow generated in the vertical direction can be efficiently suppressed with a simple structure.
Furthermore, this configuration reduces the impediment of the circulation of the water descending along the inner wall of the storage pit by the fin-shaped member.

Further, the fin-shaped member can be projected so that the tip of the fin-shaped member faces downward with respect to the horizontal.

In this configuration, the fin-shaped member reduces the hindrance to the circulation of water that descends along the inner wall of the storage pit.

A spent fuel storage facility according to another aspect of the present invention is configured to have a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface, and a spent fuel storage pit in which water is stored inside. And a spent fuel storage rack movably installed in the water in the spent fuel storage pit for containing an assembly of spent nuclear fuel, with respect to the bottom surface of the spent fuel storage pit, A water flow suppressing member that is provided on the inner wall of the spent fuel storage pit or in the vicinity thereof, and that suppresses the flow of the water caused by the spent fuel storage rack moving in water in the spent storage pit, The water flow restraint member is a plurality of fin-shaped members protruding from the inner wall of the spent fuel storage pit or the vicinity thereof toward the inside of the spent fuel storage pit and extending in a substantially horizontal longitudinal direction. The fin-shaped member is an elastic fin-shaped member having a predetermined elasticity.
A spent fuel storage facility according to another aspect of the present invention is configured to have a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface, and a spent fuel storage pit in which water is stored inside. And a spent fuel storage rack movably installed in the water in the spent fuel storage pit for containing an assembly of spent nuclear fuel, with respect to the bottom surface of the spent fuel storage pit, A water flow suppressing member that is provided on the inner wall of the spent fuel storage pit or in the vicinity thereof, and that suppresses the flow of the water caused by the spent fuel storage rack moving in water in the spent storage pit, The water flow suppressing member is a plurality of fin-shaped members that protrude from the inner wall of the spent fuel storage pit or the vicinity thereof toward the inside of the spent fuel storage pit and extend in a substantially vertical longitudinal direction. The fin-shaped member is an elastic fin-shaped member having a predetermined elasticity.
A spent fuel storage facility according to another aspect of the present invention is configured to have a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface, and a spent fuel storage pit in which water is stored inside. And a spent fuel storage rack movably installed in the water in the spent fuel storage pit for containing an assembly of spent nuclear fuel, with respect to the bottom surface of the spent fuel storage pit, A water flow suppressing member that is provided on the inner wall of the spent fuel storage pit or in the vicinity thereof, and that suppresses the flow of the water caused by the spent fuel storage rack moving in water in the spent storage pit, The water flow suppressing member is a plurality of fin-shaped members extending from the inner wall of the spent fuel storage pit or the vicinity thereof toward the inside of the spent fuel storage pit and extending in a substantially horizontal longitudinal direction, and A plurality of fin-shaped members projecting from the inner wall of the spent fuel storage pit or in the vicinity thereof toward the inside of the spent fuel storage pit and extending in a substantially vertical longitudinal direction, wherein the fin-shaped members are , An elastic fin-shaped member having a predetermined elasticity.

According to this configuration, while the fin-shaped member exerts the water flow suppressing action, if the spent fuel storage rack collides with the fin-shaped member, the shock is buffered.

A spent fuel storage facility according to another aspect of the present invention is configured to have a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface, and a spent fuel storage pit in which water is stored inside. And a spent fuel storage rack movably installed in the water in the spent fuel storage pit for containing an assembly of spent nuclear fuel, with respect to the bottom surface of the spent fuel storage pit, A water flow suppressing member that is provided on the inner wall of the spent fuel storage pit or in the vicinity thereof, and that suppresses the flow of the water caused by the spent fuel storage rack moving in water in the spent storage pit, The water flow restraint member is a plurality of fin-shaped members protruding from the inner wall of the spent fuel storage pit or the vicinity thereof toward the inside of the spent fuel storage pit and extending in a substantially horizontal longitudinal direction. The fin-shaped member is an elastic fin-shaped member having a predetermined elasticity and a rigid fin-shaped member having rigidity.
A spent fuel storage facility according to another aspect of the present invention is configured to have a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface, and a spent fuel storage pit in which water is stored inside. And a spent fuel storage rack movably installed in the water in the spent fuel storage pit for containing an assembly of spent nuclear fuel, with respect to the bottom surface of the spent fuel storage pit, A water flow suppressing member that is provided on the inner wall of the spent fuel storage pit or in the vicinity thereof, and that suppresses the flow of the water caused by the spent fuel storage rack moving in water in the spent storage pit, The water flow suppressing member is a plurality of fin-shaped members that protrude from the inner wall of the spent fuel storage pit or the vicinity thereof toward the inside of the spent fuel storage pit and extend in a substantially vertical longitudinal direction. The fin-shaped member is an elastic fin-shaped member having a predetermined elasticity and a rigid fin-shaped member having rigidity.
A spent fuel storage facility according to another aspect of the present invention is configured to have a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface, and a spent fuel storage pit in which water is stored inside. And a spent fuel storage rack movably installed in the water in the spent fuel storage pit for containing an assembly of spent nuclear fuel, with respect to the bottom surface of the spent fuel storage pit, A water flow suppressing member that is provided on the inner wall of the spent fuel storage pit or in the vicinity thereof, and that suppresses the flow of the water caused by the spent fuel storage rack moving in water in the spent storage pit, The water flow suppressing member is a plurality of fin-shaped members extending from the inner wall of the spent fuel storage pit or the vicinity thereof toward the inside of the spent fuel storage pit and extending in a substantially horizontal longitudinal direction, and A plurality of fin-shaped members projecting from the inner wall of the spent fuel storage pit or in the vicinity thereof toward the inside of the spent fuel storage pit and extending in a substantially vertical longitudinal direction, wherein the fin-shaped members are An elastic fin-shaped member having a predetermined elasticity and a rigid fin-shaped member having rigidity.

With this configuration, both the above-described cushioning action of the elastic fin-shaped member when the storage rack comes into contact and the action of ensuring the gap between the storage rack and the inner wall by the rigid fin-shaped member are obtained.

A spent fuel storage facility according to another aspect of the present invention is configured to have a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface, and a spent fuel storage pit in which water is stored inside. And a spent fuel storage rack movably installed in the water in the spent fuel storage pit for containing an assembly of spent nuclear fuel, with respect to the bottom surface of the spent fuel storage pit, A water flow suppressing member that is provided on the inner wall of the spent fuel storage pit or in the vicinity thereof, and that suppresses the flow of the water caused by the spent fuel storage rack moving in water in the spent storage pit, The water flow restraint member is a plurality of fin-shaped members protruding from the inner wall of the spent fuel storage pit or the vicinity thereof toward the inside of the spent fuel storage pit and extending in a substantially horizontal longitudinal direction. , The fin-shaped member is an elastic fin-shaped member having a predetermined elasticity and a rigid fin-shaped member having rigidity, and the elastic fin-shaped member and the rigid fin-shaped member are alternately arranged in a vertical arrangement. The protruding length of the rigid fin-shaped member provided from the inner wall or the vicinity thereof is smaller than the protruding length of the elastic fin-shaped member from the inner wall or the vicinity thereof.

In that case, both the buffering action and the gap securing action at the time of the collision of the storage rack described above are exerted as effectively as possible.

Furthermore, a spent fuel storage facility according to another aspect of the present invention is configured to have a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface, and the spent fuel storage equipment in which water is stored A pit, a spent fuel storage rack that accommodates an assembly of spent nuclear fuel and is movably installed in the water in the spent fuel storage pit with respect to the bottom surface of the spent fuel storage pit; And a water flow suppressing member that is provided on an outer surface of the spent fuel storage rack and that suppresses the flow of the water that occurs when the spent fuel storage rack moves in water in the spent storage pit.

According to this configuration, when the spent fuel storage rack placed in the spent fuel storage pit tries to move in the storage pit due to an earthquake or the like, the water flow generated in the pit due to this movement, that is, the moving storage The movement of water that is pushed away by the rack is suppressed by the water flow suppressing member. Therefore, it is possible to increase the resistance of water that suppresses the movement of the storage rack.

Further, the water flow suppressing member may be a plurality of fin-shaped members that protrude outward from the outer side surface portion of the spent fuel storage rack and extend in a substantially horizontal longitudinal direction.

According to this structure, the water flow generated by the movement of the storage rack, particularly the water flow generated in the vertical direction, can be efficiently suppressed with a simple structure.

A spent fuel storage facility according to another aspect of the present invention is configured to have a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface, and a spent fuel storage pit in which water is stored inside. And a spent fuel storage rack that accommodates an assembly of spent nuclear fuel and is movably installed in the water in the spent fuel storage pit with respect to the bottom surface of the spent fuel storage pit; A water flow suppressing member which is provided on an outer surface of the fuel storage rack and which suppresses the flow of the water generated when the spent fuel storage rack moves in the water in the spent storage pit. Is a plurality of fin-shaped members protruding outward from the outer side surface of the spent fuel storage rack and extending in a substantially horizontal longitudinal direction, wherein the fin-shaped members have horizontal ends. It is projected so as to face downward.
A spent fuel storage facility according to another aspect of the present invention is configured to have a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface, and a spent fuel storage pit in which water is stored inside. And a spent fuel storage rack that accommodates an assembly of spent nuclear fuel and is movably installed in the water in the spent fuel storage pit with respect to the bottom surface of the spent fuel storage pit; A water flow suppressing member which is provided on an outer surface of the fuel storage rack and which suppresses the flow of the water generated when the spent fuel storage rack moves in the water in the spent storage pit. Is a plurality of fin-shaped members protruding outward from the outer side surface of the spent fuel storage rack and extending in a substantially horizontal longitudinal direction, wherein the fin-shaped members have horizontal ends. It projects so that it faces upward with respect to.
A spent fuel storage facility according to another aspect of the present invention is configured to have a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface, and a spent fuel storage pit in which water is stored inside. And a spent fuel storage rack that accommodates an assembly of spent nuclear fuel and is movably installed in the water in the spent fuel storage pit with respect to the bottom surface of the spent fuel storage pit; A water flow suppressing member which is provided on an outer surface of the fuel storage rack and which suppresses the flow of the water generated when the spent fuel storage rack moves in the water in the spent storage pit. Is a plurality of fin-shaped members that project outward from the outer side surface of the spent fuel storage rack and extend in a substantially horizontal longitudinal direction, and the fin-shaped members have elastic fins having a predetermined elasticity. It is a member.
A spent fuel storage facility according to another aspect of the present invention is configured to have a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface, and a spent fuel storage pit in which water is stored inside. And a spent fuel storage rack that accommodates an assembly of spent nuclear fuel and is movably installed in the water in the spent fuel storage pit with respect to the bottom surface of the spent fuel storage pit; A water flow suppressing member which is provided on an outer surface of the fuel storage rack and which suppresses the flow of the water generated when the spent fuel storage rack moves in the water in the spent storage pit. Is a plurality of fin-shaped members that project outward from the outer side surface of the spent fuel storage rack and extend in a substantially horizontal longitudinal direction, and the fin-shaped members have elastic fins having a predetermined elasticity. And a rigid fin-shaped member having rigidity.
A spent fuel storage facility according to another aspect of the present invention is configured to have a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface, and a spent fuel storage pit in which water is stored inside. And a spent fuel storage rack that accommodates an assembly of spent nuclear fuel and is movably installed in the water in the spent fuel storage pit with respect to the bottom surface of the spent fuel storage pit; A water flow suppressing member which is provided on an outer surface of the fuel storage rack and which suppresses the flow of the water generated when the spent fuel storage rack moves in the water in the spent storage pit. Is a plurality of fin-shaped members that project outward from the outer side surface of the spent fuel storage rack and extend in a substantially horizontal longitudinal direction, and the fin-shaped members have elastic fins having a predetermined elasticity. -Shaped member and a rigid fin-shaped member having rigidity, wherein the elastic fin-shaped members and the rigid fin-shaped members are alternately provided with respect to the upper and lower arrangements, and the inner wall of the rigid fin-shaped member or its The protruding length from the vicinity is smaller than the protruding length from the inner wall of the elastic fin-shaped member or the vicinity thereof.

According to this configuration, both the water flow suppressing member provided on the inner wall of the spent fuel storage pit or in the vicinity thereof and the water flow suppressing member provided on the outer side surface of the spent fuel storage rack further improve the water flow suppressing action. Obtainable.

According to the spent fuel storage facility of the present invention, the water flow suppressing member can suppress the movement of water that occurs when the spent fuel rack moves in the spent fuel pit due to a large earthquake or the like, that is, the water flow, As a result, the movement of the spent fuel rack in the fuel pit can be suppressed.

FIG. 1 is an elevational view showing a partial cross-section of a spent fuel storage facility according to a first embodiment of the first aspect of the present invention. FIG. 3 is a partial cross-sectional elevational view for explaining the operation of the spent fuel storage facility according to the embodiment shown in FIG. 1. FIG. 3 is an elevational view showing a partial cross-section of a spent fuel storage facility according to a second embodiment of the first invention of the present invention. FIG. 6 is an elevational view showing a partial cross-section of a spent fuel storage facility according to a third embodiment of the first aspect of the present invention. FIG. 5 is a partial cross-sectional elevational view for explaining the operation of the spent fuel storage facility according to the embodiment shown in FIG. 4. FIG. 8 is an elevation view showing a partial cross-section of a spent fuel storage facility according to a fourth embodiment of the first invention of the present invention. FIG. 7 is a sectional view taken along the line AA of FIG. 6. FIG. 6 is an elevation view showing a spent fuel storage facility according to an embodiment of a second invention of the present invention in a partial cross section.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows a first embodiment of a spent nuclear fuel storage facility according to the first aspect of the present invention.
As shown in FIG. 1, a spent fuel storage facility 60 according to the present invention includes a spent fuel storage pit (hereinafter, “storage pit”) 10, a spent fuel storage rack (hereinafter, “storage rack”) 20, and Be equipped with.

The storage pit 10 is a large internal space surrounded by a substantially horizontal bottom surface 1 and an inner wall 2 that rises substantially vertically from the bottom surface 1. The water W is stored inside and forms a so-called pool. .. The storage pit (spent fuel storage pit) 10 may also be referred to as a spent fuel storage pool in the art.

The storage rack 20 accommodates an assembly of spent nuclear fuel and is accommodated in the storage pit 10 so as to be supported on the bottom surface 1. Therefore, the storage rack 20 is located underwater. The depth of the storage pit 10 is, for example, approximately twice the height of the storage rack 20.

Thus, the storage rack 20 is supported on the bottom surface 1 of the storage pit 10, but is not fixedly fixed to the bottom surface 1 but is supported so as to be slidable with respect to the bottom surface 1. .. The structure for slidably supporting the storage rack 20 with respect to the bottom surface 1 is not particularly limited, and although not shown, for example, a sliding member is provided at the bottom end of the support leg 21 of the storage rack 20 and in contact with the bottom surface 1. Can be mounted and configured to slide on the bottom surface 1 when a lateral force is exerted on the storage rack 20. Further, a plate member having a smooth surface with a small friction coefficient may be laid on the bottom surface 1. With such a supporting form, the storage rack 20 can slide on the floor surface 1 in all horizontal directions, and therefore when the storage rack 20 receives an external force, the storage rack 20 receives the external force. You can move to.

As shown in FIG. 1, a water flow suppressing member 30 is provided near the inner wall 2 of the storage pit 10. In the present embodiment, the water flow suppressing member 30 is composed of a plurality of elastic fin-shaped members 31 protruding from the vicinity of the inner wall 2 of the storage pit 10 toward the inside of the storage pit 10. These elastic fin-shaped members 31 extend in the longitudinal direction which is substantially horizontal in a form along the inner wall 2, and are arranged in parallel and in the vertical direction at substantially constant intervals.

In the present embodiment, the elastic fin-shaped member 31 is a plate-shaped member made of metal, for example, aluminum. These fin-shaped members 31 are in this case attached to the support frame 33. The support frame 33 is, for example, a metal frame body configured to come into close contact with the inner wall 2 almost exactly, and the plurality of elastic fin-shaped members 31 are firmly attached to the support frame 32 by, for example, welding. ing.

The width (that is, the protruding length) and the thickness of the elastic fin-shaped member 31 are set so that a predetermined elasticity can be obtained. That is, as will be described later, it is assumed that the elastic fin-shaped member 31 hits when the storage rack 20 moves. In this way, the elasticity of the elastic fin member 31 is set to such a degree that the elastic fin-shaped member 31 bends in the width direction while exhibiting some bending resistance when the storage rack 20 is hit. On the other hand, when the storage fin 20 hits the storage rack 20, the elastic fin-shaped member 31 has an elasticity such that the elastic fin-shaped member 31 bends and deforms very easily. The cushioning effect at the time of collision is not fully exerted. Therefore, the elasticity of the elastic fin-shaped member 31 is set so as to exert such an action.

The length of the elastic fin-shaped member 31 in the longitudinal direction is preferably as long as the mounting allows. That is, it is preferable that the region where the elastic fin-shaped member 31 is not provided is present as few as possible in the circumferential direction of the inner wall 2 or is as small as possible.

In this embodiment, each elastic fin-shaped member 31 projects so that the tip of the fin is slightly downward with respect to the horizontal, as shown in the figure.

As shown in the drawing, the position where the water flow suppressing member 30 (elastic fin-shaped member 31) is provided on the wall surface 2 is at least a portion of the wall surface 2 corresponding to the storage rack 20.

The spent fuel storage facility 60 having the above structure is configured by the following steps.

The storage rack 20 is configured to be slidable on the bottom surface 1 of the storage pit 10. The support frame 33 is assembled on the ground, and a plurality of elastic fin-shaped members 31 are attached to the support frame 33 by welding. In this way, the support frame 33 to which the plurality of elastic fin-shaped members are attached is suspended by the lifting equipment installed above the storage pit 10 and installed in the storage pit 10. With this, the spent fuel storage facility 60 is completed. Since the support frame 33 has a configuration that fits closely with the inner wall 2, the elastic fin-shaped member 31 has a configuration similar to that of the elastic fin-shaped member 31 that projects from the inner wall 2.

Next, the operation of the spent fuel storage facility 60 having the above configuration will be described.
FIG. 1 shows a state where the spent fuel storage facility 60 is stable. In this state, the storage rack 20 is located substantially at the center of the storage pit 10 or at a position close to the center. The water W in the storage pit 10 is warmed by the heat of the spent nuclear fuel rods stored in the storage rack 20. Therefore, the water W forms a large natural convection that rises in the area around the storage rack 20 and then descends near the inner wall 2. As a result, the spent nuclear fuel rods stored in the storage rack 20 are maintained in a cooled state.

Now, it is assumed that a large external force, especially a horizontal force acts on the storage rack 20 due to an earthquake or the like. The storage rack 20 is slidably mounted on the bottom surface 1 as described above. Therefore, the storage rack 20 to which the external force is applied tends to move in the direction of the force. However, the storage rack 20 does not easily move a large distance depending on the magnitude of the applied external force. This is because there is resistance of the water W existing around.

However, when a very large earthquake occurs, the situation is different from the above case. A large force is applied to the storage rack 20 and tries to move largely on the bottom surface 1. Although there is resistance of the water W, the storage rack 20 to which a large amount of kinetic energy is applied pushes the water W away and tries to move.

In the above situation, in the spent fuel storage facility 60 having the configuration shown in the above embodiment, when the storage rack 20 moves, the water W displaced by the storage rack 20 is moved by the elastic fin member 31. Is suppressed by. Therefore, the water W can resist the movement of the storage rack 20, and as a result, the movement of the storage rack 20 is suppressed.

Nevertheless, if a larger earthquake than expected occurs, the storage rack 20 may move toward the inner wall 2 and eventually collide with the elastic fin-shaped member 31. Even in such a case, since the elastic fin-shaped member 31 has the predetermined elasticity as described above, the elastic fin-shaped member 31 is deformed as shown in FIG. 2 and thereby buffers the shock when the storage rack 20 collides. Thereby, damage to the storage rack 20 when the storage rack 20 collides with the elastic fin-shaped member 31 can be reduced as much as possible.

As described above, according to the spent fuel storage facility 60 of the above-described embodiment, in the spent fuel storage facility 60 in which the storage rack 20 is slidably accommodated in the storage pit 20, even when a large earthquake occurs, elastic fins can be used. Since the member 31 (water flow suppressing member 30) suppresses the movement (water flow) of the water W that occurs when the storage pit 20 moves, the movement of the storage pit 20 can be suppressed.

In addition, when the storage pit 20 collides with the elastic fin-shaped member 31 due to a very large earthquake or the like, the elastic fin-shaped member 31 elastically deforms to buffer the impact of the collision. Damage to the storage rack 20 is reduced.

Furthermore, the elastic fin-shaped member 31 projects so that the tip thereof is oriented downward with respect to the horizontal. Therefore, the flow of the water W rising from the periphery of the storage pit 20 and then falling along the inner wall 2 can be suppressed from being blocked by the elastic fin-shaped portion 31.

Further, since the elastic fin-shaped member 31 is attached downward with respect to the horizontal, that is, in an inclined manner, when the storage rack 20 hits the elastic fin-shaped member 31, the elastic fin-shaped member 31 faces downward. A bending moment is generated, and as a result, the elastic fin-shaped members 31 are uniformly bent and deformed downward. By bending the elastic fin-shaped member 31 in this manner, the bent elastic fin-shaped member 31 comes into contact with the outer surface 22 of the storage rack 22 as a surface, and damage to the storage rack 22 is reduced.

Although the material of the elastic fin-shaped member 31 is not particularly limited, it is preferably a metal in view of the functional requirements for exhibiting the above-mentioned action and the conditions for installation.

Next, FIG. 3 shows a spent fuel storage facility 70 according to a second embodiment of the first invention of the present invention. In the figure, the same components as those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the equipment 70 of the second embodiment, the water flow suppressing member 30 is a plurality of rigid fin-shaped members 32. In this case, the rigid fin-shaped member 32 is a plate-shaped member made of metal, for example, aluminum. The rigid fin-shaped member 32 is firmly attached to the support frame 33 by, for example, welding, as in the first embodiment.

The rigid fin-shaped member 32 has a larger plate thickness than the elastic fin-shaped member 32 shown in the previous embodiment, and the projection length from the inner wall 2 (specifically, the support frame 33) is small. Therefore, the rigid fin-shaped member 32 has a predetermined rigidity. That is, similar to the situation described in the previous embodiment, it is assumed that the rigid fin-shaped member 32 hits when the storage rack 20 moves. The rigidity here is determined with the intention that the rigid fin-shaped member 32 does not substantially deform even when the storage rack 20 is hit. However, since the rigid fin-shaped member 32 is made of metal, it is impossible to assume that no elastic deformation occurs even if any force is applied, as a common general technical knowledge. That is, the rigidity referred to here means that the rigid fin-shaped member 32 is not provided with an intentional elasticity for deforming the fin-shaped member 32, and its shape is almost the same even when the storage rack 20 collides. In the sense of maintaining.

Other configurations are similar to those of the first embodiment.

Next, the operation of the spent fuel storage facility 70 having the above structure will be described.
When a large external force, particularly a horizontal force, acts on the storage rack 20 due to an earthquake or the like, the storage rack 20 tends to move toward the inner wall 2. The surrounding water W resists this movement, but if a very large earthquake occurs, the storage rack 20 will push the water W away and try to move. However, the movement of the water W that is pushed away by the storage rack 20 is suppressed by the rigid fin-shaped member 32, so that the water W can resist the movement of the storage rack 20 and consequently the movement of the storage rack 20 is suppressed. To be done.

Further, when a larger earthquake than expected occurs, the storage rack 20 may move toward the inner wall 2 and collide with the rigid fin-shaped member 32. In such a case, the storage fin 20 may be slightly damaged (the spent nuclear fuel rods are not damaged) because the rigid fin-shaped member 32 is hardly deformed. The facility 70 according to the present embodiment has some risks as described above, but has the following advantages.

As described above, it is assumed that the storage rack 20 moves to the inner wall 2 and hits the rigid fin-shaped member 32 due to a very large earthquake or the like. In this situation, since the rigid fin-shaped member 32 does not deform like the elastic fin-shaped member 31 described above, the rigid fin-shaped member 32 spills between the outer surface 22 of the storage rack 20 and the inner surface 2 of the storage pit 10. The gap by 32 is maintained. Therefore, even in such a state, a circulation flow path for the water W is secured between the outer surface 22 of the storage rack 20 and the inner surface 2 of the storage pit 10.

Next, FIG. 4 shows a spent fuel storage facility 80 according to the third embodiment of the first invention. In the figure, the same components as those of the first and second embodiments are designated by the same reference numerals and the description thereof will be omitted.

The third embodiment is basically a combination of the first embodiment and the second embodiment. That is, both the elastic fin-shaped member 31 and the rigid fin-shaped member 32 are provided as the water flow suppressing member 30.

In this case, the elastic fin-shaped members 31 and the rigid fin-shaped members 32 are alternately arranged in the vertical direction as shown in the drawing. The protruding length of the elastic fin-shaped member 31 is smaller than the protruding length of the rigid fin-shaped member 32.

Other configurations are the same as those of the first and second embodiments.

The spent fuel storage facility 80 according to the third embodiment can obtain both the action of the facility 60 according to the above-described first embodiment and the action of the facility 70 according to the second embodiment. That is, when the storage rack 20 moves with respect to the inner wall 2 due to a strong external force, the storage rack 20 first hits the elastic fin-shaped member 31 having a large protruding length. The elastic fin-shaped member 31 is deformed, so that the impact of a collision is buffered.

If the storage rack 20 continues to move further, the storage rack 20 then strikes the rigid fin member 32 and stops. This state is shown in FIG. However, since the storage rack 20 receives the cushioning action of the elastic fin-shaped member 31 before hitting the rigid fin-shaped member 32, the impact energy at that time is smaller than that of the second embodiment. Moreover, since the storage rack 20 hits the rigid fin-shaped member 32 and stops, the water circulation path is secured.

In the third embodiment, in the example shown in FIG. 4 (FIG. 4), the rigid fin-shaped member 32 is also directed downward like the elastic fin-shaped member 31. When the protruding lengths of the two are different and the two are alternately arranged, the rigid fin-shaped member 32 does not have to face downward. This is because the water descending along the vicinity of the inner wall 2 is eventually guided by the elastic fin-shaped member 31 having a large protruding length.

Further, in each of the above-described embodiments, the elastic fin-shaped member 31 and/or the rigid fin 32 is configured to be installed downward with respect to the horizontal. However, in the present invention, these fin-shaped members are always installed downward. It doesn't have to be. When the fin-shaped members are installed downward, the above-described action can be obtained, while when air enters between the upper and lower fin-shaped members, it is assumed that the air does not escape and accumulates there. .. Therefore, it is conceivable to form holes for air escape in various portions of the fin-shaped member 30.

Next, FIGS. 6 and 7 show a spent fuel storage facility 90 according to a fourth embodiment of the first invention of the present invention.
In the figure, the same components as those in the above-described embodiments are designated by the same reference numerals, and the description thereof will be omitted.

In the above-described three embodiments, all the water flow suppressing members 30 (elastic fin-shaped member 31, rigid fin-shaped member 32) are substantially horizontal and protrude from the vicinity of the inner wall 2 of the storage pit 10 toward the inside of the storage pit 10. It was configured to extend in the longitudinal direction. In the fourth embodiment, in addition to the water flow suppressing member 30 having the horizontal longitudinal direction as described above, as shown in FIGS. 6 and 7, the water flow suppressing member 30 extends from the vicinity of the inner wall 2 of the storage pit 10 toward the inside of the storage pit 10. The water flow suppressing member 40 is provided so as to project and extend in a substantially vertical longitudinal direction.

In the present embodiment, the water flow suppressing member 40 that is perpendicular to the longitudinal direction is provided below the inner wall 2, that is, in a region close to the bottom surface 1, as shown in FIG. 6. That is, to explain in relation to the height of the storage rack 2, in the inner wall 2, from the vicinity of the bottom surface 2 to about half the height of the storage rack 2, the water flow suppressing member 40 that is vertical in the longitudinal direction is provided. The water flow suppressing member 30 which is horizontal in the longitudinal direction is provided in the upper part thereof.

The water flow suppressing member 40 that is vertical in the longitudinal direction is firmly fixed to the support frame 33, like the water flow suppressing member 30 that is horizontal in the longitudinal direction. The water flow suppressing member 30 and the water flow suppressing member 40 may be attached to the common support frame 33.

The various configurations relating to the water flow suppressing member 30 which is horizontal in the longitudinal direction described above are similarly applicable to the water flow suppressing member 40 except for matters relating to the downward projection. That is, the water flow suppressing member 40 can be an elastic fin-shaped member, a rigid fin-shaped member, or both. Further, in the case of using both the elastic fin-shaped member and the rigid fin-shaped member, they may be arranged alternately (in this case, left and right alternately), and the protruding length of both fin-shaped members may be changed. Good.

The operation of the spent fuel storage facility 90 according to the fourth embodiment will be described below.
When a large external force acts on the storage rack 20 due to occurrence of an earthquake or the like, particularly a horizontal force, the surrounding water W resists the movement of the storage rack 20, but a very large earthquake occurs. In some cases, the storage rack 20 pushes the water W and tries to move.

At this time, the directions in which the water W that is pushed away escapes are in all the directions of up, down, left, and right. The water flow that is pushed away and escapes in the vertical direction meets the resistance of the water flow suppressing member 30 whose longitudinal direction is horizontal, and the water flow that escapes left and right meets the resistance of the water flow suppressing member 40 whose longitudinal direction is vertical. In this way, the water W is not easily displaced by the storage rack 20 when the storage rack 20 is about to move, and thus can resist the movement of the storage rack 20. As a result, movement of the storage rack 20 is suppressed.

In the present embodiment, since the water flow generated when the storage rack 20 moves in this way is suppressed in both the vertical direction and the horizontal direction, the movement suppressing action of the storage rack 20 is further strengthened.

The action when the storage rack 20 hits the water flow suppressing members 30 and 40 due to the generation of a very strong external force is the same as that already described in each of the above embodiments.

In addition, in each of the embodiments relating to the first invention described above, the region where the water flow suppressing member 30 is installed has been described as being up to a position corresponding to substantially the upper end of the storage rack 20 in the upper portion. 30 may be provided up to a position above the upper level of the storage rack 20.

Further, in each of the above-described embodiments, the water flow suppressing member 30 or the water flow suppressing member 40 is attached to the support frame 33, but if possible, the water flow suppressing member may be directly provided on the inner wall 2. For example, when the water flow suppressing member that does not require elasticity like the rigid fin-shaped member 32 is used, the inner wall 2 itself made of concrete is projected in a plate shape or a ridge shape when the storage pit 10 is constructed. It may be possible to form the protruding portion to be formed.

Next, FIG. 8 shows an embodiment of the spent fuel storage facility 100 according to the second aspect of the present invention.
In the first invention, the water flow suppressing member 30 or the water flow suppressing member 40 is provided in the portion corresponding to the inner wall 2 of the storage pit 10. However, in the second invention, as shown in the drawing, the water flow suppressing member 50 is the storage rack 20. Is provided on the outer surface 22 of the.

The water flow suppressing member 50 is firmly attached to the frame of the outer surface 22 of the storage rack 20. The structure of the water flow suppressing member 50 and various characteristics as the embodiment are the same as those of the water flow suppressing member 30 or 40 described in the first invention.

That is, the water flow suppressing member 50 may be an elastic fin-shaped member or a rigid fin-shaped member that protrudes outward from the portion of the outer surface 22 of the storage rack 20, or both. Further, in the case of using both the elastic fin-shaped member and the rigid fin-shaped member, both of them may be arranged alternately, and the protruding length of both fin-shaped members may be changed.

In FIG. 8, the water flow suppressing member 50 provided on the outer side surface 22 of the storage rack 20 is directed downward with respect to the horizontal direction like the water flow suppressing members 30 and 40 provided on the inner wall 2 of the storage pit 10. Although the protruding structure is shown, the water W around the storage rack 20 forms an upward flow due to the heat generated by the storage rack 20, so that the water flow suppressing member 50 is projected upward with respect to the horizontal direction. You may comprise.

According to the second aspect of the invention, as in the first aspect of the invention, for example, in a situation where a large earthquake occurs and the storage rack 20 moves in water, the water flow suppressing member provided on the outer side surface 22 of the storage rack 20. 50 inhibits the flow of water, which limits movement to the storage rack 20.

Nevertheless, the action of the water flow suppressing member 50 when the movement distance of the storage rack 20 is large and hits the inner wall 2 is the same as that of the water flow suppressing members 30 and 40 already described, depending on the respective configurations.

Next, another aspect (third invention) of the present invention will be described. Although illustration regarding the third invention is omitted, the present invention is a combination of the configuration according to the first invention shown in FIGS. 1 to 7 and the configuration according to the second invention shown in FIG. Therefore, in the following, the third invention will be described using the members (and their reference numerals) shown in FIGS. 1 to 8. The third invention can also be interpreted as a modified embodiment of the first invention described above.

In the spent fuel storage facility according to the third aspect of the present invention, in the portion of the inner wall 2 of the storage pit 10, for example, the water flow suppressing member 30 or the water flow suppressing member as shown in FIGS. 1, 3, 4, and 6. The member 40 or both of them are provided, and the water flow suppressing member 50 is provided on the outer surface 22 of the storage rack 20 as shown in FIG. 8, for example.

In the spent fuel storage facility according to the third aspect of the present invention, the water flow suppressing function provided by both the inner wall of the storage pit or the vicinity thereof and the outer peripheral surface of the storage rack is further enhanced, and the movement of the storage rack 20 is further enhanced. Suppressed. Further, particularly when both the water flow suppressing member 30 on the inner wall 2 side and the water flow suppressing member 50 on the storage rack 20 side are elastic fin-shaped members, cushioning when the storage rack 20 approaches the inner wall 2 and both collide. The action is enhanced, and the damage avoidance of the storage rack 20 is further improved.

As an additional effect that can be said to the whole of the present invention, when a large earthquake or the like occurs, the water W itself in the storage pit 20 causes sloshing (oscillation), and this sloshing causes the storage rack 20 to move. However, according to the present invention, the water flow suppressing member has an effect of suppressing this sloshing, and also from this viewpoint, the movement of the storage rack 20 is further suppressed.

As described above, the embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the spirit of the present invention. Be done.

1 ... bottom surface 2 ... inner wall 10 ... spent fuel storage pit 20 ... spent fuel storage rack 21 ... support legs 22 ... outside surface 30 ... water flow suppressing member 31 ... -Elastic fin-shaped member 32 ... Rigid fin-shaped member 33 ... Support frame 40 ... Water flow suppressing member 50 ... Water flow suppressing member 60 ... Spent fuel storage facility (first invention, first embodiment form)
70 ・・・Spent fuel storage facility (first invention, second embodiment)
80 ・・・Spent fuel storage facility (first invention, third embodiment)
90 ・・・Spent fuel storage facility (first invention, fourth embodiment)
100 ... spent fuel storage facility (second invention)
W... water

Claims (17)

A spent fuel storage pit that has a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface and that stores water therein;
A spent fuel storage rack movably installed with respect to the bottom surface of the spent fuel storage pit in the water in the spent fuel storage pit containing an assembly of spent nuclear fuel;
A water flow suppressing member that is provided on the inner wall of the spent fuel storage pit or in the vicinity thereof and that suppresses the flow of the water generated by the spent fuel storage rack moving in water in the spent storage pit;
Equipped with
The water flow restraint member is a plurality of fin-shaped members protruding from the inner wall of the spent fuel storage pit or the vicinity thereof toward the inside of the spent fuel storage pit and extending in a substantially horizontal longitudinal direction. ,
The spent fuel storage facility , wherein the fin-shaped member projects such that the tip of the fin-shaped member faces downward with respect to the horizontal . The spent fuel storage facility according to claim 1,
The spent fuel storage facility, wherein the fin-shaped member is a rigid fin-shaped member having rigidity. A spent fuel storage pit that has a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface and that stores water therein;
A spent fuel storage rack movably installed with respect to the bottom surface of the spent fuel storage pit in the water in the spent fuel storage pit containing an assembly of spent nuclear fuel;
A water flow suppressing member that is provided on the inner wall of the spent fuel storage pit or in the vicinity thereof and that suppresses the flow of the water generated by the spent fuel storage rack moving in water in the spent storage pit;
Equipped with
The water flow restraint member is a plurality of fin-shaped members protruding from the inner wall of the spent fuel storage pit or the vicinity thereof toward the inside of the spent fuel storage pit and extending in a substantially horizontal longitudinal direction. ,
The spent fuel storage facility , wherein the fin-shaped member is an elastic fin-shaped member having a predetermined elasticity . A spent fuel storage pit that has a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface and that stores water therein;
A spent fuel storage rack movably installed with respect to the bottom surface of the spent fuel storage pit in the water in the spent fuel storage pit containing an assembly of spent nuclear fuel;
A water flow suppressing member that is provided on the inner wall of the spent fuel storage pit or in the vicinity thereof and that suppresses the flow of the water generated by the spent fuel storage rack moving in water in the spent storage pit;
Equipped with
The water flow suppressing member is a plurality of fin-shaped members that protrude from the inner wall of the spent fuel storage pit or the vicinity thereof toward the inside of the spent fuel storage pit and extend in a substantially vertical longitudinal direction. ,
The spent fuel storage facility , wherein the fin-shaped member is an elastic fin-shaped member having a predetermined elasticity . A spent fuel storage pit that has a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface and that stores water therein;
A spent fuel storage rack movably installed with respect to the bottom surface of the spent fuel storage pit in the water in the spent fuel storage pit containing an assembly of spent nuclear fuel;
A water flow suppressing member that is provided on the inner wall of the spent fuel storage pit or in the vicinity thereof and that suppresses the flow of the water generated by the spent fuel storage rack moving in water in the spent storage pit;
Equipped with
The water flow suppressing member is a plurality of fin-shaped members that extend from the inner wall of the spent fuel storage pit or the vicinity thereof toward the inside of the spent fuel storage pit and extend in a substantially horizontal longitudinal direction, and A plurality of fin-shaped members extending from the inner wall of the spent fuel storage pit or in the vicinity thereof toward the inside of the spent fuel storage pit and extending in a substantially vertical longitudinal direction,
The spent fuel storage facility , wherein the fin-shaped member is an elastic fin-shaped member having a predetermined elasticity . A spent fuel storage pit having a substantially horizontal bottom surface and an inner wall rising substantially vertically from the bottom surface, in which water is stored;
A spent fuel storage rack movably installed with respect to the bottom surface of the spent fuel storage pit in the water in the spent fuel storage pit containing an assembly of spent nuclear fuel;
A water flow suppressing member that is provided on the inner wall of the spent fuel storage pit or in the vicinity thereof and that suppresses the flow of the water generated by the spent fuel storage rack moving in water in the spent storage pit;
Equipped with
The water flow restraint member is a plurality of fin-shaped members protruding from the inner wall of the spent fuel storage pit or the vicinity thereof toward the inside of the spent fuel storage pit and extending in a substantially horizontal longitudinal direction. ,
The spent fuel storage facility , wherein the fin-shaped member is an elastic fin-shaped member having a predetermined elasticity and a rigid fin-shaped member having rigidity . A spent fuel storage pit that has a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface and that stores water therein;
A spent fuel storage rack movably installed with respect to the bottom surface of the spent fuel storage pit in the water in the spent fuel storage pit containing an assembly of spent nuclear fuel;
A water flow suppressing member that is provided on the inner wall of the spent fuel storage pit or in the vicinity thereof and that suppresses the flow of the water generated by the spent fuel storage rack moving in water in the spent storage pit;
Equipped with
The water flow suppressing member is a plurality of fin-shaped members that protrude from the inner wall of the spent fuel storage pit or the vicinity thereof toward the inside of the spent fuel storage pit and extend in a substantially vertical longitudinal direction. ,
The spent fuel storage facility , wherein the fin-shaped member is an elastic fin-shaped member having a predetermined elasticity and a rigid fin-shaped member having rigidity . A spent fuel storage pit that has a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface and that stores water therein;
A spent fuel storage rack movably installed with respect to the bottom surface of the spent fuel storage pit in the water in the spent fuel storage pit containing an assembly of spent nuclear fuel;
A water flow suppressing member that is provided on the inner wall of the spent fuel storage pit or in the vicinity thereof and that suppresses the flow of the water generated by the spent fuel storage rack moving in water in the spent storage pit;
Equipped with
The water flow suppressing member is a plurality of fin-shaped members extending from the inner wall of the spent fuel storage pit or the vicinity thereof toward the inside of the spent fuel storage pit and extending in a substantially horizontal longitudinal direction, and A plurality of fin-shaped members extending from the inner wall of the spent fuel storage pit or in the vicinity thereof toward the inside of the spent fuel storage pit and extending in a substantially vertical longitudinal direction,
The spent fuel storage facility , wherein the fin-shaped member is an elastic fin-shaped member having a predetermined elasticity and a rigid fin-shaped member having rigidity . A spent fuel storage pit that has a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface and that stores water therein;
A spent fuel storage rack movably installed with respect to the bottom surface of the spent fuel storage pit in the water in the spent fuel storage pit containing an assembly of spent nuclear fuel;
A water flow suppressing member that is provided on the inner wall of the spent fuel storage pit or in the vicinity thereof and that suppresses the flow of the water generated by the spent fuel storage rack moving in water in the spent storage pit;
Equipped with
The water flow restraint member is a plurality of fin-shaped members protruding from the inner wall of the spent fuel storage pit or the vicinity thereof toward the inside of the spent fuel storage pit and extending in a substantially horizontal longitudinal direction. ,
The fin-shaped member is an elastic fin-shaped member having a predetermined elasticity and a rigid fin-shaped member having rigidity, and the elastic fin-shaped member and the rigid fin-shaped member are alternately provided in the upper and lower arrangements. And the projecting length of the rigid fin-shaped member from the inner wall or the vicinity thereof is smaller than the projecting length of the elastic fin-shaped member from the inner wall or the vicinity thereof . The spent fuel storage facility according to any one of claims 3 to 9 ,
The spent fuel storage facility, wherein the fin-shaped member projects such that the tip of the fin-shaped member faces downward with respect to the horizontal. The spent fuel storage facility according to any one of claims 1 to 10 ,
The spent fuel storage rack is provided with a water flow suppressing member on an outer side surface thereof for suppressing the flow of the water generated when the spent fuel storage rack moves in water in the spent storage pit. Spent fuel storage facility. The spent fuel storage facility according to claim 11 ,
The spent fuel storage facility is a plurality of fin-shaped members that project outward from the outer surface of the spent fuel storage rack and extend in a substantially horizontal longitudinal direction. A spent fuel storage pit that has a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface and that stores water therein;
A spent fuel storage rack that is movably installed in the water in the spent fuel storage pit to accommodate an assembly of spent nuclear fuel and is movable with respect to the bottom surface of the spent fuel storage pit;
A water flow suppressing member that is provided on the outer surface of the spent fuel storage rack and that suppresses the flow of the water that occurs when the spent fuel storage rack moves in water in the spent storage pit;
Equipped with
The water flow suppressing member is a plurality of fin-shaped members that extend outward from the outer surface portion of the spent fuel storage rack and extend in a substantially horizontal longitudinal direction,
The spent fuel storage facility , wherein the fin-shaped member projects such that the tip of the fin-shaped member faces downward with respect to the horizontal . A spent fuel storage pit that has a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface and that stores water therein;
A spent fuel storage rack that is movably installed in the water in the spent fuel storage pit to accommodate an assembly of spent nuclear fuel and is movable relative to the bottom surface of the spent fuel storage pit,
A water flow suppressing member that is provided on the outer surface of the spent fuel storage rack and that suppresses the flow of the water that occurs when the spent fuel storage rack moves in water in the spent storage pit;
Equipped with
The water flow suppressing member is a plurality of fin-shaped members that extend outward from the outer surface portion of the spent fuel storage rack and extend in a substantially horizontal longitudinal direction,
The spent fuel storage facility , wherein the fin-shaped member is projected so that a tip of the fin-shaped member faces upward with respect to the horizontal . A spent fuel storage pit that has a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface and that stores water therein;
A spent fuel storage rack that is movably installed in the water in the spent fuel storage pit to accommodate an assembly of spent nuclear fuel and is movable with respect to the bottom surface of the spent fuel storage pit;
A water flow suppressing member that is provided on the outer surface of the spent fuel storage rack and that suppresses the flow of the water that occurs when the spent fuel storage rack moves in water in the spent storage pit;
Equipped with
The water flow suppressing member is a plurality of fin-shaped members that extend outward from the outer surface portion of the spent fuel storage rack and extend in a substantially horizontal longitudinal direction,
The spent fuel storage facility , wherein the fin-shaped member is an elastic fin-shaped member having a predetermined elasticity . A spent fuel storage pit that has a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface and that stores water therein;
A spent fuel storage rack that is movably installed in the water in the spent fuel storage pit to accommodate an assembly of spent nuclear fuel and is movable relative to the bottom surface of the spent fuel storage pit,
A water flow suppressing member that is provided on the outer surface of the spent fuel storage rack and that suppresses the flow of the water that occurs when the spent fuel storage rack moves in water in the spent storage pit;
Equipped with
The water flow suppressing member is a plurality of fin-shaped members that extend outward from the outer surface portion of the spent fuel storage rack and extend in a substantially horizontal longitudinal direction,
The spent fuel storage facility , wherein the fin-shaped member is an elastic fin-shaped member having a predetermined elasticity and a rigid fin-shaped member having rigidity . A spent fuel storage pit that has a substantially horizontal bottom surface and an inner wall that rises substantially vertically from the bottom surface and that stores water therein;
A spent fuel storage rack that is movably installed in the water in the spent fuel storage pit to accommodate an assembly of spent nuclear fuel and is movable relative to the bottom surface of the spent fuel storage pit,
A water flow suppressing member that is provided on the outer surface of the spent fuel storage rack and that suppresses the flow of the water that occurs when the spent fuel storage rack moves in water in the spent storage pit;
Equipped with
The water flow suppressing member is a plurality of fin-shaped members that extend outward from the outer surface portion of the spent fuel storage rack and extend in a substantially horizontal longitudinal direction,
The fin-shaped member is an elastic fin-shaped member having a predetermined elasticity and a rigid fin-shaped member having rigidity, and the elastic fin-shaped member and the rigid fin-shaped member are alternately provided in the upper and lower arrangements. And the projecting length of the rigid fin-shaped member from the inner wall or the vicinity thereof is smaller than the projecting length of the elastic fin-shaped member from the inner wall or the vicinity thereof .

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