JP7037340B2 - Fuel storage equipment with damper device and damper device - Google Patents

Description

The present disclosure relates to a damper device and a fuel storage facility having a damper device.

Spent fuel taken out of the reactor or unused fuel installed in the reactor is stored in a fuel storage rack and stored in a fuel pool in which cooling water is stored. In order to improve the earthquake resistance of the fuel storage rack in the fuel pool, for example, in Patent Document 1, a grid-like rack holding member having a plurality of openings into which the fuel storage rack can be inserted in the vertical direction is provided in the fuel pool. It is described that it is fixed and a fuel storage rack is inserted into the opening to hold the fuel storage rack. Further, for example, in Patent Document 2, a cylinder having a recess in which a piston is slidably fitted is fixed to the outer peripheral surface of the fuel storage rack, and the piston abuts on the inner wall surface of the fuel pool to cause the fuel storage rack. It is stated that the vibration is suppressed from becoming excessive.

Japanese Unexamined Patent Publication No. 2009-109302 Japanese Unexamined Patent Publication No. 2017-83211

However, in the invention described in Patent Document 1, the rack holding member needs to be fixed to the fuel pool, and in the invention described in Patent Document 2, the cylinder needs to be fixed to the fuel storage rack. There was a problem that it took time and effort.

In view of the above circumstances, at least one embodiment of the present disclosure provides a fuel storage facility with an easily installable damper device and a damper device for holding a fuel storage rack stored in a fuel pool. The purpose is.

The damper device according to at least one embodiment of the present disclosure is
It is placed on the floor surface between the inner wall surface of the fuel pool and the outer peripheral surface of at least one fuel storage rack that is configured to accommodate fuel and is placed on the floor surface of the fuel pool. It ’s a damper device,
A cylinder portion having a main body portion that can abut on one of the inner wall surface and the outer peripheral surface and has a concave portion formed along the spacing direction between the inner wall surface and the outer peripheral surface, and the inner wall surface and the outer peripheral surface. At least one damper portion that can abut on the other side of the outer peripheral surface and includes a piston portion having a convex portion that is fitted into the concave portion.
A holding portion that holds at least one damper portion, and a holding portion.
With a rolling member provided in the holding portion and configured to be rollable on the floor surface.
Have.

According to at least one embodiment of the present disclosure, even if the fuel storage rack slides or vibrates in the fuel pool and moves toward the inner wall surface of the fuel pool, it is fitted into the recess of the cylinder portion. By receiving the load of the fuel storage rack on the protrusion, the fuel storage rack can be held. Further, since the damper device can be installed only by placing it on the floor surface of the fuel pool between the inner wall surface of the fuel pool and the outer peripheral surface of the fuel storage rack, the damper device can be easily installed.

It is a figure which shows the structure of the fuel storage facility which concerns on Embodiment 1 of this disclosure. It is sectional drawing which shows the structure of the damper part of the damper apparatus which concerns on Embodiment 1 of this disclosure. It is sectional drawing which shows the structure of the damper part of the damper apparatus which concerns on the modification 1 of Embodiment 1 of this disclosure. It is sectional drawing which shows the structure of the damper part of the damper apparatus which concerns on the modification 2 of Embodiment 1 of this disclosure. It is sectional drawing which shows the structure of the damper part of the damper apparatus which concerns on the modification 3 of Embodiment 1 of this disclosure. It is sectional drawing which shows the structure of the damper part of the damper apparatus which concerns on the modification 4 of Embodiment 1 of this disclosure. It is sectional drawing which shows the structure of the damper part of the damper apparatus which concerns on the modification 5 of Embodiment 1 of this disclosure. It is a figure which shows the structure of the damper apparatus which concerns on the modification 6 of Embodiment 1 of this disclosure. It is sectional drawing which shows the structure of the damper part of the damper apparatus which concerns on the modification 7 of Embodiment 1 of this disclosure. It is a figure which shows the structure of the damper apparatus which concerns on the modification 8 of Embodiment 1 of this disclosure. It is a figure which shows the structure of the damper apparatus which concerns on the modification 9 of Embodiment 1 of this disclosure. It is a top view which shows the structure of the fuel storage facility which concerns on Embodiment 2 of this disclosure. FIG. 3 is a partially enlarged plan view of adjacent fuel storage racks in the fuel storage facility according to the second embodiment of the present disclosure. It is a figure which shows the structure of the fuel storage facility which concerns on Embodiment 3 of this disclosure.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the scope of the present invention is not limited to the following embodiments. The dimensions, materials, shapes, relative arrangements, and the like of the components described in the following embodiments are not intended to limit the scope of the present invention to that, but are merely explanatory examples.

(Embodiment 1)
As shown in FIG. 1, the fuel storage facility 1 according to the first embodiment of the present disclosure is placed on the fuel pool 2 in which the cooling water is stored and on the floor surface 2a of the fuel pool 2 in the fuel pool 2. It is provided with at least one fuel storage rack 3 and a damper device 4 mounted between the outer peripheral surface 3a of the fuel storage rack 3 and the inner wall surface 2b of the fuel pool 2 in the fuel pool 2.

The fuel storage rack 3 has a rectangular parallelepiped shape with an open upper portion so that a plurality of fuels 5 (spent fuel or unused fuel) can be accommodated therein. A plurality of legs 3b that are not fixed to the floor surface 2a are provided at the bottom of the fuel storage rack 3, and the outer peripheral surface 3a is not fixed to the inner wall surface 2b. That is, the fuel storage rack 3 is a free standing rack that is slidable with respect to the floor surface 2a.

The damper device 4 includes at least one damper portion 10 and a holding portion 11 for holding the damper portion 10. The holding portion 11 includes a base portion 11a for mounting the damper device 4 on the floor surface 2a. Since the base portion 11a is only mounted on the floor surface 2a, the damper device 4 is mounted in the fuel pool 2 so as to be movable with respect to the floor surface 2a. Since the damper device 4 is installed in the fuel pool 2 only by placing the base portion 11a between the inner wall surface 2b and the outer peripheral surface 3a on the floor surface 2a, the damper device 4 can be easily installed. Can be installed. In particular, it becomes very easy to install the damper device 4 on the existing equipment.

As shown in FIG. 2, the damper portion 10 has a cylindrical cylinder portion 20 and a piston portion 30. The cylinder portion 20 is connected to the first contact portion 21 having a circular plate shape so as to be able to contact the inner wall surface 2b, and is connected to the first contact portion 21 and is in the spacing direction between the inner wall surface 2b and the outer peripheral surface 3a. It has a main body portion 22 in which a concave portion 23 recessed along the surface is formed. The piston portion 30 is configured to be connected to a circular plate-shaped second contact portion 31 that is configured to be able to contact the outer peripheral surface 3a and to be fitted into the recess 23. It has a convex portion 32. In the space 24 in the recess 23 defined by the protrusion 32, there is cooling water that has flowed in when the damper device 4 (see FIG. 1) is installed in the fuel pool 2. A very small gap 25 that communicates the space 24 and the inside of the fuel pool 2 is formed between the outer peripheral surface of the convex portion 32 and the inner peripheral surface of the concave portion 23.

Next, the operation of the damper device 4 in the fuel storage facility 1 according to the first embodiment will be described.
As shown in FIG. 1, since the fuel storage rack 3 is a free standing rack, when the fuel pool 2 vibrates due to an earthquake or the like, the fuel storage rack 3 slides or locks on the floor surface 2a and the inner wall surface 2b May move towards. In such a case, as shown in FIG. 2, the fuel storage rack 3 collides with the second contact portion 31 and applies a load in the direction of pushing the convex portion 32 into the concave portion 23 to the damper portion 10.

In order for the convex portion 32 to be pushed into the concave portion 23 by the load of the fuel storage rack 3, the cooling water must be drained from the space 24 through the gap 25. However, as described above, since the gap 25 is a very small gap, the fuel storage rack 3 momentarily pushes the convex portion 32 into the concave portion 23 by moving toward the inner wall surface 2b. When such a load is applied to the convex portion 32, drainage from the space 24 through the gap 25 is difficult, so that the convex portion 32 has the concave portion 23 unless the load of the fuel storage rack 3 is extremely large and continues for a long time. The convex portion 32 receives the load of the fuel storage rack 3 without being pushed in, and the fuel storage rack 3 can be held. As a result, sliding and locking of the fuel storage rack 3 on the floor surface 2a (see FIG. 1) can be suppressed.

On the other hand, the drainage of the cooling water from the space 24 through the gap 25 is very slow, as in the case where the convex portion 32 heats up along the inside of the concave portion 23 due to the heat generated from the fuel 5 (see FIG. 1). In this case, since the cooling water can be drained through the gap 25, the convex portion 32 can heat-extend in the concave portion 23. In a configuration in which the load of the fuel storage rack 3 is received by a member such as a rigid strut rod instead of the damper device 4 (see FIG. 1), unnecessary stress is applied to the fuel storage rack 3 due to the thermal elongation of the strut rod. Although there is a possibility, by using the damper device 4, it is possible to appropriately cope with the heat elongation due to the heat generated from the fuel 5.

In this way, even if the fuel storage rack 3 slides or vibrates in the fuel pool 2 and moves toward the inner wall surface 2b of the fuel pool 2, the convex portion fitted in the concave portion 23 of the cylinder portion 20. The fuel storage rack 3 can be held by the 32 receiving the load of the fuel storage rack 3. Further, since the damper device 4 can be installed simply by placing it on the floor surface 2a of the fuel pool 2 between the inner wall surface 2b of the fuel pool 2 and the outer peripheral surface 3a of the fuel storage rack 3, the damper device 4 can be easily installed. Can be installed in.

In the first embodiment, the damper device 4 has a damper portion 10 including a cylinder portion 20 having a main body portion 22 in which a concave portion 23 is formed and a piston portion 32 having a convex portion 32. It is not limited to any form. Hereinafter, modifications 1 to 9 of the damper device 4 will be described. In the modified examples 1 to 9, the same reference numerals are given to the same components as those of the first embodiment, and detailed description thereof will be omitted.

(Modification 1)
As shown in FIG. 3, the main body 22 of the cylinder 20 is formed with a through hole 26 that communicates the space 24 with the outside of the main body 22. In the first modification, when the convex portion 32 receives the load of the fuel storage rack 3, the cooling water in the space 24 is discharged through the through hole 26 so that the convex portion 32 can slide in the concave portion 23. Then, the load of the fuel storage rack 3 can be gently received as compared with the case where the convex portion 32 does not slide in the concave portion 23 (corresponding to the first embodiment), and the impact on the fuel storage rack 3 and the fuel pool 2 can be received. Can be reduced.

By adjusting the inner diameter of the through hole 26, the magnitude of the force required for the convex portion 32 to slide in the concave portion 23 can be adjusted, so that the fuel storage rack 3 and the fuel pool 2 can be adjusted. The impact reduction effect can also be adjusted. By making the inner diameter of the through hole 26 as small as possible, it is possible to adjust so that the convex portion 32 hardly slides in the concave portion 23 as in the first embodiment.

(Modification 2)
As shown in FIG. 4, a plate-shaped fluid resistance passive member 33 configured so that the convex portion 32 faces in a direction extending in the concave portion 23 is fixed to the convex portion 32 so as to be located in the concave portion 23. Has been done. Although it is not an indispensable configuration, in the main body portion 22, when the convex portion 32 slides in the direction of exiting from the concave portion 32 (left direction in FIG. 4), the fluid resistance passive member 33 comes into contact with the convex portion 32 so that the convex portion 32 comes into contact with the concave portion 32. A retaining portion 34 may be formed to prevent the fluid from coming off. The retaining portion 34 is, for example, an annular plate-shaped member provided along the circumferential direction of the inner peripheral surface of the recess 23. The annular plate-shaped member may be divided into a plurality of members in the circumferential direction of the inner peripheral surface of the recess 23. The retaining portion 34 can prevent the convex portion 32 from coming off from the concave portion 23.

In the second modification, when the convex portion 32 receives the load of the fuel storage rack 3 and the convex portion 32 receives a force in the direction of being pushed into the concave portion 23, the fluid resistance passive member 33 flows from the cooling water in the space 24. By receiving the resistance, the convex portion 32 can receive a larger load. This makes it possible to hold the fuel storage rack 3 more firmly.

(Modification 3)
As shown in FIG. 5, a spring 27a, which is an elastic member 27 configured to be able to press the convex portion 32 toward the outer peripheral surface 3a, is provided in the concave portion 23. When the fuel storage rack 3 pushes the convex portion 32 into the concave portion 23, the spring 27a allows the convex portion 32 to return to the state before the fuel storage rack 3 pushes the convex portion 32 into the concave portion 23. As a result, even if the fuel storage rack 3 moves toward the inner wall surface 2b of the fuel pool 2 again, the convex portion 32 can receive the load of the fuel storage rack 3.

(Modification example 4)
As shown in FIG. 6, a leaf spring 27b, which is an elastic member 27 configured to be able to press the convex portion 32 toward the outer peripheral surface 3a, is provided in the concave portion 23. Similar to the modification 3, when the fuel storage rack 3 pushes the convex portion 32 into the concave portion 23, the convex portion 32 is in a state before the fuel storage rack 3 pushes the convex portion 32 into the concave portion 23 by the leaf spring 27b. You can go back to. As a result, even if the fuel storage rack 3 moves toward the inner wall surface 2b of the fuel pool 2 again, the convex portion 32 can receive the load of the fuel storage rack 3.

Further, if the convex portion 32 and the leaf spring 27b are brought into contact with each other when the damper device 4 (see FIG. 1) is installed, the leaf spring 27b flexes appropriately when the convex portion 32 is thermally stretched, and the leaf spring 27b An initial load is applied to the convex portion 32. The space 24 is partitioned by a leaf spring 27b into a first space 24a and a second space 24b that communicate with each other through a hole 27b1 formed in the leaf spring 27b, but the convex portion 32 and the leaf spring 27b come into contact with each other. Since the second space 24b on the opposite side of the convex portion 32 is sealed with respect to the leaf spring 27b, the convex portion 32 cannot be pushed further, and the convex portion 32 is more firmly attached to the fuel storage rack 3. Can receive a load.

(Modification 5)
As shown in FIG. 7, the first contact portion 21 is fixed to the inner wall surface 2b by a bolt 28, and the second contact portion 31 is fixed to the outer peripheral surface 3a by a bolt 35. After installing the damper device 4 (see FIG. 1) in the fuel pool 2, the damper device 4 can be fixed in place by fixing the first contact portion 21 and the second contact portion 31 in this way. can.

(Modification 6)
As shown in FIG. 8, the base portion 11a is provided with a roller 12a which is a rolling member 12 configured to be rollable on the floor surface 2a. The rolling member 12 is not limited to the roller 12a, and any known member such as a wheel or the like that can roll on the floor surface 2a can be used. The rollers 12a make it easier to move the damper device 4 to a suitable place in the fuel pool 2.

(Modification 7)
As shown in FIG. 9, the cylinder portion 20 further includes a concave spherical first spherical seat 41 formed on the first contact portion 21 and a first spherical portion 42 provided on the main body portion 22. is doing. The first spherical portion 42 is slidably engaged with the first spherical seat 41, and the main body portion 22 is rotatably connected to the first contact portion 21. The first spherical portion 42 may be provided on the first contact portion 21, and the first spherical seat 41 may be formed on the main body portion 22.

The piston portion 30 further has a concave spherical second spherical seat 43 formed on the second contact portion 31 and a second spherical portion 44 provided on the convex portion 32. The second spherical portion 44 is slidably engaged with the second spherical seat 43, and the convex portion 32 is rotatably connected to the second contact portion 31. The second spherical portion 44 may be provided on the second contact portion 31, and the second spherical seat 43 may be formed on the convex portion 32.

Even if the inner wall surface 2b and the outer peripheral surface 3a are not completely flat or are inclined with respect to the vertical direction, the main body portion 22 and the convex portion with respect to the first contact portion 21 and the second contact portion 31. By rotating each of the 32, the concave portion 23 and the convex portion 32 can be directed along the spacing direction between the inner wall surface 2b and the outer peripheral surface 3a, so that the convex portion 32 fitted in the concave portion 23 stores fuel. The fuel storage rack 3 can be held by receiving the load of the rack 3. The first spherical seat 41 and the first spherical portion 42 may be formed and provided only on the cylinder portion 20, and the second spherical seat 43 and the second spherical portion 44 may be formed and provided only on the piston portion 30. You may.

(Modification 8)
As shown in FIG. 10, each main body portion 22 of the plurality of damper portions 10 is connected to one flat first plate-shaped member 51 configured so as to be in contact with the inner wall surface 2b, and each convex portion 32 is connected to each convex portion 32. , It is connected to one flat second plate-shaped member 52 configured so as to be in contact with the outer peripheral surface 3a. It should be noted that only the first plate-shaped member 51 may be provided, or the second plate-shaped member 52 may be provided.

Since each main body portion 22 and each convex portion 32 are connected to the first plate-shaped member 51 and the second plate-shaped member 52, respectively, each main body portion 22 and each convex portion 32 are connected to separate plate-shaped members. The area of the first plate-shaped member 51 and the second plate-shaped member 52 is larger than that of the above configuration. Then, when the first plate-shaped member 51 is in contact with the inner wall surface 2b and the second plate-shaped member 52 is in contact with the outer peripheral surface 3a, the first plate-shaped member 51 and the second plate-shaped member 52 are in contact with the inner wall surface 2b and Even if it tries to separate from the outer peripheral surface 3a, it becomes difficult to separate due to the water pressure, so that the damper portion 10 can easily follow the movement of the fuel storage rack 3. On the contrary, when the first plate-shaped member 51 and the second plate-shaped member 52 are separated from the inner wall surface 2b and the outer peripheral surface 3a, respectively, even if the fuel storage rack 3 approaches the damper device 4, the inner wall surface 2b and Since each of the outer peripheral surface 3a and each of the first plate-shaped member and the second plate-shaped member 52 are less likely to collide with each other, the damper portion 10 can gently receive the load of the fuel storage rack 3. As a result, the damping effect on the movement of the fuel storage rack 3 can be improved.

Further, since each of the first plate-shaped member 51 and the second plate-shaped member 52 having a large area abuts on the inner wall surface 2b and the outer peripheral surface 3a, a large load is locally applied to the inner wall surface 2b and the outer peripheral surface 3a. Can be suppressed.

In this modification 8, the first plate-shaped member 51 and the second plate-shaped member 52 are each one plate-shaped member, but they may be divided into two or more. If it is a plate-shaped member to which at least two main body portions 22 and convex portions 32 are connected, each plate-shaped member is compared with a configuration in which each main body portion 22 and each convex portion 32 are connected to separate plate-shaped members. Since the area of is large, an effect close to the above effect can be obtained.

Further, at least one of the first plate-shaped member 51 and the second plate-shaped member 52 may be formed of a radiation shielding material such as lead. The distance between the inner wall surface 2b and the outer peripheral surface 3a is limited by the radiation shielding performance. Since lead has a high radiation shielding performance, the radiation emitted from the fuel 5 (see FIG. 1) can be shielded by the first plate-shaped member 51 and the second plate-shaped member 52. The required distance between the wall surface 2b and the outer peripheral surface 3a can be reduced. Then, the effective space for storing the fuel storage rack 3 in the space in the fuel pool 2 becomes large, so that more fuel storage racks 3 can be stored.

Further, since lead is soft and easily deformed, when the first plate-shaped member 51 and the second plate-shaped member 52 formed of lead collide with the inner wall surface 2b or the outer peripheral surface 3a, the lead absorbs the energy of the collision by deforming. Therefore, the impact on the fuel storage rack 3 and the fuel pool 2 can be reduced.

(Modification 9)
The modified example 9 is a form in which the modified example 7 and the modified example 8 are combined. As shown in FIG. 11, the cylinder portion 20 has a concave spherical third spherical seat 45 formed on the first plate-shaped member 51 and a third spherical portion 46 provided on the main body 22. ing. The third spherical portion 46 is slidably engaged with the third spherical seat 45, and the main body portion 22 is rotatably connected to the first plate-shaped member 51. The third spherical portion 46 may be provided on the first plate-shaped member 51, and the third spherical seat 45 may be formed on the main body portion 22.

The piston portion 30 further has a concave spherical fourth spherical seat 47 formed on the second plate-shaped member 52, and a fourth spherical portion 48 provided on the convex portion 32. The fourth spherical portion 48 is slidably engaged with the fourth spherical seat 47, and the convex portion 32 is rotatably connected to the second plate-shaped member 52. The fourth spherical portion 48 may be provided on the second plate-shaped member 52, and the fourth spherical seat 47 may be formed on the convex portion 32.

Even if the inner wall surface 2b and the outer peripheral surface 3a are not completely flat or are inclined with respect to the vertical direction, the main body portion 22 and the convex portion with respect to the first plate-shaped member 51 and the second plate-shaped member 52. By rotating each of the 32, the concave portion 23 and the convex portion 32 can be directed along the spacing direction between the inner wall surface 2b and the outer peripheral surface 3a, so that the convex portion 32 fitted in the concave portion 23 stores fuel. The fuel storage rack 3 can be held by receiving the load of the rack 3. The third spherical seat 45 and the third spherical portion 46 may be formed and provided only on the cylinder portion 20, and the fourth spherical seat 47 and the fourth spherical portion 48 may be formed and provided only on the piston portion 30. You may.

The above modification examples 1 to 9 may arbitrarily combine two or more modification examples as long as they do not contradict each other.

In the first embodiment and the modified examples 1 to 9, the cylinder portion 20 can abut on the inner wall surface 2b and the piston portion 30 can abut on the outer peripheral surface 3a, but the cylinder portion 20 abuts on the outer peripheral surface 3a. It is possible, and the piston portion 30 may be able to come into contact with the inner wall surface 2b. Further, when the damper device 4 has a plurality of damper portions 10, at least one damper device 4 has a cylinder portion 20 that can abut on the inner wall surface 2b and a piston portion 30 that can abut on the outer peripheral surface 3a. It may include a damper portion and at least one damper portion in which the cylinder portion 20 can abut on the outer peripheral surface 3a and the piston portion 30 can abut on the inner wall surface 2b.

In the first embodiment and the first to sixth modifications, the cylinder portion 20 has the first contact portion 21, and the piston portion 30 has the second contact portion 31, but the present invention is not limited to this embodiment. .. The first contact portion 21 and the second contact portion 31 do not exist, the main body portion 22 can directly contact one of the inner wall surface 2b and the outer peripheral surface 3a, and the convex portion 32 has the inner wall surface 2b and the outer peripheral surface 3a. It may be possible to directly contact the other side of the wall.

In the first embodiment and the first to ninth modifications, the fuel storage rack 3 is a free standing rack, but it is a fuel storage rack that is fixed to the floor surface 2a or supported by the inner wall surface 2b. There may be. Even in such a fuel storage rack, it is possible that the fuel pool 2 vibrates due to vibration. Therefore, the convex portion 32 receives a load due to the movement of the fuel storage rack toward the inner wall surface 2b due to the vibration. Vibration can be damped.

In the first embodiment and the first to ninth modifications, the damper device 4 includes a damper portion 10 having a cylinder portion 20 and a piston portion 30 having a convex portion 32 that can be pushed into the recess 23 of the cylinder portion 20. , Not limited to this form. Instead of the damper portion 10, the damper device 4 may have a member having a structure that does not deform even when the fuel storage rack 3 is loaded, for example, a rigid member having a polygonal column shape, a columnar shape, a rod shape, or the like.

(Embodiment 2)
Next, the fuel storage facility according to the second embodiment will be described. The fuel storage facility according to the second embodiment is limited to the case where two or more fuel storage racks 3 are stored in the fuel pool 2 with respect to the first embodiment. In the second embodiment, the same reference numerals as those of the constituent requirements of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 12, in the fuel pool 2, a plurality of fuel storage racks 3 are assembled so as to form one fuel storage rack group 60 while the adjacent fuel storage racks 3 are in contact with each other. The fuel storage rack 3 is mounted. In the fuel pool 2, a plurality of damper devices 4 are provided between the outer peripheral surface 60a and the inner wall surface 2b of the fuel storage rack group 60 so as to surround the fuel storage rack group 60. Other configurations are the same as those in the first embodiment. It should be noted that any combination of any one of the modifications 1 to 9 of the first embodiment or any two or more thereof can be applied to the damper device 4.

The operation of the damper device 4 to hold the fuel storage rack 3 constituting the fuel storage rack group 60 is the same as that of the first embodiment. In the second embodiment, by arranging the damper device 4 so as to surround the fuel storage rack group 60, it is possible to reduce the risk of the fuel storage rack 3 falling and slipping.

In the second embodiment, as shown in FIG. 13, a pad 61 may be provided on each of the adjacent outer peripheral surfaces 3a of the adjacent fuel storage racks 3 to define the contact surface between the opposite outer peripheral surfaces 3a. Since the adjacent fuel storage racks 3 are in contact with each other on the pad 61, it is possible to reduce the risk of damage to the fuel storage racks 3 by suppressing the direct contact between the fuel storage racks 3 and the fuel storage racks 3.

(Embodiment 3)
Next, the fuel storage facility according to the third embodiment will be described. The fuel storage facility according to the third embodiment is limited to the fuel storage facility in which the existing fuel storage facility is changed to the one for storing the free standing rack with respect to the first embodiment. In the third embodiment, the same reference numerals as those of the constituent requirements of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 14, the flat plate 70 is placed on the floor surface 2a of the fuel pool 2, and at least one fuel storage rack 3 is placed on the flat plate 70. In the fuel pool 2, a damper device 4 is installed between the outer peripheral surface 3a of the fuel storage rack 3 and the inner wall surface 2b of the fuel pool 2. The damper device 4 has a damper portion 10 of the first embodiment and a second damper portion 80 provided at the lower end of the holding portion 11.

The second damper portion 80 is a second main body portion 82 in which a second concave portion 83 that is abuttable to the inner wall surface 2b and is recessed along the spacing direction between the inner wall surface 2b and the side surface 70a of the flat plate 70 is formed. It has a second cylinder portion 81 having a second cylinder portion 81, and a second piston portion 84 having a second convex portion 85 that can be brought into contact with the side surface 70a and is fitted into the second concave portion 83. The configuration of the second damper portion 80 is the same as the configuration of the damper portion 10 except that the second piston portion 84 can abut on the side surface 70a of the flat plate 70. Other configurations are the same as those in the first embodiment. It should be noted that any of the modifications 1 to 9 of the first embodiment or any combination of two or more thereof can be applied to the configuration of the damper device 4 other than the second damper portion 80. For the 2 damper portion 80, any one of the modifications 1 to 5 and 7 of the first embodiment or any combination of two or more thereof can be applied.

In the third embodiment, the damper section 10 holds the fuel storage rack 3 and the second damper section 80 holds the flat plate 70, as in the first embodiment. When reracking the existing fuel storage facility, the flat plate 70 is placed on the floor surface 2 of the fuel pool 2, but since the second damper portion 80 can hold the flat plate 70, the flat plate 70 can be used as the fuel pool 2. It is not necessary to fix the fuel to the pool, and the re-racking work can be simplified.

In the third embodiment, the second cylinder portion 81 can abut on the inner wall surface 2b and the second piston portion 84 can abut on the side surface 70a of the flat plate 70, but the second cylinder portion 81 can abut on the flat plate. The second piston portion 84 may be in contact with the inner wall surface 2b as well as in contact with the side surface 70a of the 70.

(1) The damper device according to at least one embodiment of the present disclosure is
It is placed on the floor surface between the inner wall surface of the fuel pool and the outer peripheral surface of at least one fuel storage rack that is configured to accommodate fuel and is placed on the floor surface of the fuel pool. It ’s a damper device,
A cylinder portion having a main body portion that can abut on one of the inner wall surface and the outer peripheral surface and has a concave portion formed along the spacing direction between the inner wall surface and the outer peripheral surface.
It has at least one damper portion that is capable of contacting the other of the inner wall surface and the outer peripheral surface and includes a piston portion having a convex portion fitted in the concave portion.

According to the configuration of (1) above, even if the fuel storage rack slides or vibrates in the fuel pool and moves toward the inner wall surface of the fuel pool, the convex portion fitted in the concave portion of the cylinder portion is formed. The fuel storage rack can be held by receiving the load of the fuel storage rack. Further, since the damper device can be installed only by placing it on the floor surface of the fuel pool between the inner wall surface of the fuel pool and the outer peripheral surface of the fuel storage rack, the damper device can be easily installed.

(2) In some embodiments, in the configuration of (1) above,
The cylinder portion is provided with an elastic member configured to press the convex portion toward the inner wall surface or the outer peripheral surface to which the piston portion can come into contact.

According to the configuration (2) above, when the fuel storage rack pushes the convex portion into the concave portion, the elastic member allows the convex portion to return to the state before the fuel storage rack pushes the convex portion into the concave portion. If the fuel storage rack moves again towards the inner wall of the fuel pool, the protrusions can still be loaded by the fuel storage rack.

(3) In some embodiments, in the configuration of (1) or (2) above,
The plate-shaped fluid resistance passive member is fixed to the convex portion so as to be located in the concave portion, and the fluid resistance passive member is configured such that the convex portion faces in a direction extending in the concave portion.

According to the configuration of (3) above, when the convex portion receives the load of the fuel storage rack and receives the force in the direction in which the convex portion is pushed into the concave portion, the fluid resistance passive member receives the fluid resistance from the cooling water in the concave portion. By receiving it, the convex portion can receive a larger load, so that the fuel storage rack can be held more firmly.

(4) In some embodiments, in the configuration of (3) above,
The cylinder portion is formed with a retaining portion for preventing the convex portion from coming out of the concave portion due to contact with the fluid resistance passive member when the convex portion slides in the direction of coming out of the concave portion. ing.

According to the configuration of (4) above, it is possible to prevent the convex portion from coming off from the concave portion by the retaining portion.

(5) In some embodiments, in the configuration of (1) above,
The cylinder portion is formed with a through hole that communicates the space in the concave portion defined by the convex portion with the outside of the cylinder portion .

According to the configuration of (5) above, when the convex portion receives the load of the fuel storage rack, the cooling water in the space is discharged through the through hole so that the convex portion can slide in the concave portion. The load of the fuel storage rack can be gently received as compared with the case where the portion does not slide in the recess, and the impact on the fuel storage rack and the fuel pool can be reduced. Further, by adjusting the inner diameter of the through hole, the magnitude of the force required for the convex portion to slide in the concave portion can be adjusted, so that the impact reduction effect on the fuel storage rack and the fuel pool can be adjusted. You can also do it.

(6) In some embodiments, in any of the configurations (1) to (5) above,
The cylinder part is
A first contact portion capable of contacting one of the inner wall surface and the outer peripheral surface,
A concave spherical first spherical seat formed on one of the first contact portion and the main body portion,
A first spherical portion provided on the other side of the first contact portion and the main body portion, which is slidably engaged with the first spherical seat and the main body portion rotates to the first contact portion. It further has a first spherical portion that is movably connected.

According to the configuration of (6) above, even if the inner wall surface or the outer peripheral surface to which the first contact portion can be contacted is not completely flat or is inclined with respect to the vertical direction, the first contact is made. By rotating the main body with respect to the portion, the concave portion can be directed along the spacing direction between the inner wall surface and the outer peripheral surface, so that the convex portion fitted in the concave portion receives the load of the fuel storage rack. This allows the fuel storage rack to be held.

(7) In some embodiments, in any of the configurations (1) to (6) above,
The piston part is
A second contact portion capable of contacting the inner wall surface and the outer peripheral surface whichever the cylinder portion does not contact, and the second contact portion.
A concave spherical second spherical seat formed on one of the second contact portion and the convex portion, and
A second spherical portion provided on the other side of the second contact portion and the convex portion, which is slidably engaged with the second spherical seat and the convex portion is rotated to the second contact portion. It further has a second spherical portion that is movably connected.

According to the configuration of (7) above, even if the inner wall surface or the outer peripheral surface to which the second contact portion can be contacted is not completely flat or is inclined with respect to the vertical direction, the second contact is made. By rotating the convex portion with respect to the portion, the convex portion can be directed along the spacing direction between the inner wall surface and the outer peripheral surface, so that the convex portion fitted in the concave portion can load the fuel storage rack. By receiving, the fuel storage rack can be held.

(8) In some embodiments, in any of the configurations (1) to (5) above,
The damper device has a plurality of damper sections and has a plurality of damper sections.
At least two of the main body portions of each cylinder portion of the plurality of damper portions are connected to one first plate-shaped member capable of contacting one of the inner wall surface and the outer peripheral surface.

According to the configuration of (8) above, since at least two main body portions are connected to the first plate-shaped member, the first plate-shaped member has a structure as compared with a configuration in which each main body portion is connected to a separate plate-shaped member. The area will be large. Then, when the first plate-shaped member is in contact with the inner wall surface or the outer peripheral surface, even if the first plate-shaped member tries to separate from the inner wall surface or the outer peripheral surface, it becomes difficult to separate due to water pressure, so that the damper portion is a fuel storage rack. It becomes easier to follow the movement of. On the contrary, even if the fuel storage rack faces the damper device when the first plate-shaped member is separated from the inner wall surface or the outer peripheral surface, the inner wall surface or the outer peripheral surface and the first plate-shaped member are less likely to collide with each other. , The damper part can gently receive the load of the fuel storage rack. As a result, the damping effect on the movement of the fuel storage rack can be improved.

(9) In some embodiments, in the configuration of (8) above,
A concave spherical third spherical seat is formed on each of the at least two main bodies and one of the first plate-shaped members.
Slidably engages with the third spherical seat and rotatably connects the main body to each of the at least two main bodies and the other of the first plate-shaped members. A third spherical portion is provided.

According to the configuration of (9) above, even if the inner wall surface or the outer peripheral surface with which the first plate-shaped member abuts is not completely flat or is inclined with respect to the vertical direction, the first plate-shaped member is opposed to the first plate-shaped member. By rotating the main body, the concave portion can be directed along the spacing direction between the inner wall surface and the outer peripheral surface. Therefore, the convex portion fitted in the concave portion receives the load of the fuel storage rack to fuel. Can hold storage racks.

(10) In some embodiments, in any of the configurations (1) to (5), (8) and (9) above.
The damper device has a plurality of damper sections and has a plurality of damper sections.
At least two of the convex portions of the piston portions of the plurality of damper portions are in the form of one second plate capable of contacting the inner wall surface and the outer peripheral surface on which the cylinder portion does not abut. It is connected to the member.

According to the configuration of (10) above, since at least two convex portions are connected to the second plate-shaped member, the second plate-shaped member has a structure in which each convex portion is connected to a separate plate-shaped member. The area will be large. Then, when the second plate-shaped member is in contact with the inner wall surface or the outer peripheral surface, even if the second plate-shaped member tries to separate from the inner wall surface or the outer peripheral surface, it becomes difficult to separate due to water pressure, so that the damper portion is a fuel storage rack. It becomes easier to follow the movement of. On the contrary, even if the fuel storage rack faces the damper device when the second plate-shaped member is separated from the inner wall surface or the outer peripheral surface, the inner wall surface or the outer peripheral surface and the second plate-shaped member are less likely to collide with each other. , The damper part can gently receive the load of the fuel storage rack. As a result, the damping effect on the movement of the fuel storage rack can be improved.

(11) In some embodiments, in the configuration of (10) above,
A concave spherical fourth spherical seat is formed on each of the at least two convex portions and one of the second plate-shaped members.
Slidably engages with the fourth spherical seat and rotatably connects the convex portion to each of the at least two convex portions and the other of the second plate-shaped member. A fourth spherical portion is provided.

According to the configuration of (11) above, even if the inner wall surface or the outer peripheral surface with which the second plate-shaped member abuts is not completely flat or is inclined with respect to the vertical direction, the second plate-shaped member is opposed to the second plate-shaped member. By rotating the convex portion, the convex portion can be directed along the spacing direction between the inner wall surface and the outer peripheral surface. Therefore, the convex portion fitted in the concave portion receives the load of the fuel storage rack. Can hold a fuel storage rack.

(12) In some embodiments, in any of the configurations (8) to (11) above,
The first plate-shaped member is made of a radiation shielding material.

(13) In some embodiments, in the configuration of (10) or (11) above,
The second plate-shaped member is made of a radiation shielding material.

The distance between the inner wall surface and the outer peripheral surface is constrained by the radiation shielding performance. According to the configurations (12) and (13) above, since the first plate-shaped member and the second plate-shaped member formed of the radiation shielding material can shield the radiation emitted from the fuel, the viewpoint of radiation shielding The required distance between the inner wall surface and the outer peripheral surface can be reduced. Then, the effective space for storing the fuel storage rack in the space in the fuel pool becomes large, so that more fuel storage racks can be stored.

Further, when lead is used as a radiation shielding material, lead is soft and easily deformed. Therefore, when the first plate-shaped member and the second plate-shaped member formed from lead collide with the inner wall surface or the outer peripheral surface, the lead is deformed. Since the energy of the collision can be absorbed, the impact on the fuel storage rack and the fuel pool can be reduced.

( 14 ) In some embodiments, in any of the configurations (1) to (5) above,
At least one of the cylinder portion and the piston portion is fixed to the inner wall surface or the outer peripheral surface.

According to the configuration of ( 14 ) above, after installing the damper device in the fuel pool, the damper device can be fixed in place.

( 15 ) In some embodiments, in any of the configurations (1) to ( 13 ) above,
A holding portion that holds at least one damper portion, and a holding portion.
It further has a rolling member provided in the holding portion and configured to be rollable on the floor surface.

According to the configuration of ( 15 ) above, the damper device can be easily moved to the right place in the fuel pool.

( 16 ) In some embodiments, in any of the configurations (1) to ( 13 ) above,
The at least one fuel storage rack is mounted on a flat plate mounted on the floor surface.
The damper device is
A second cylinder having a second main body portion that can abut on one of the inner wall surface and the side surface of the flat plate and has a second recess formed along the spacing direction between the inner wall surface and the side surface. Department and
It further has a second damper portion that is capable of contacting the inner wall surface and the other side of the side surface, and includes a second piston portion having a second convex portion that is fitted into the second concave portion.

When reracking an existing fuel storage facility, a flat plate is placed on the floor of the fuel pool. According to the configuration of the above ( 16 ), since the second damper portion can also hold the flat plate, it is not necessary to fix the flat plate to the fuel pool, and the re-racking work can be simplified.

( 17 ) The fuel storage facility according to at least one embodiment of the present disclosure is
With the fuel pool,
With at least one fuel storage rack configured to accommodate fuel and resting on the floor of the fuel pool.
At least one of (1) to ( 16 ) above, which is movably placed in the fuel pool with respect to the floor surface between the inner wall surface of the fuel pool and the outer peripheral surface of the fuel storage rack. It is equipped with two damper devices.

According to the configuration of ( 17 ) above, even if the fuel storage rack slides or vibrates in the fuel pool and moves toward the inner wall surface of the fuel pool, the convex portion fitted in the concave portion of the cylinder portion is formed. The fuel storage rack can be held by receiving the load of the fuel storage rack. Further, since the damper device can be installed only by placing it on the floor surface of the fuel pool between the inner wall surface of the fuel pool and the outer peripheral surface of the fuel storage rack, the damper device can be easily installed.

( 18 ) In some embodiments, in the configuration of ( 17 ) above,
In the fuel pool, a plurality of the fuel storage racks are placed so as to form one fuel storage rack group.
A plurality of damper devices are provided between the outer peripheral surface and the inner wall surface of the fuel storage rack group so as to surround the fuel storage rack group.

According to the configuration of ( 18 ) above, by arranging the damper device so as to surround the fuel storage rack group, it is possible to reduce the risk of the fuel storage rack from tipping over and slipping.

( 19 ) In some embodiments, in the configuration of ( 18 ) above,
Pads are provided on the facing outer peripheral surfaces of the adjacent fuel storage racks to define the contact surfaces between the facing outer peripheral surfaces.

According to the configuration of ( 19 ) above, since the adjacent fuel storage racks are in contact with each other at the pad, it is possible to reduce the risk of damage to the fuel storage racks by suppressing the direct contact between the fuel storage racks. can.

1 Fuel storage facility 2 Fuel pool 2a (fuel pool) Floor surface 2b (fuel pool) inner wall surface 3 Fuel storage rack 3a (fuel storage rack) outer peripheral surface 3b Leg 4 Damper device 5 Fuel 10 Damper 11 Holding 11a Base part 12 Rolling member 12a Roller 20 Cylinder part 21 First contact part 22 Main body part 23 Recession 24 Space 24a First space 24b Second space 25 Gap 26 Through hole 27 Elastic member 27a Spring 27b Plate spring 27b1 Hole 28 Bolt 30 Piston part 31 Second contact part 32 Convex part 33 Fluid resistance Passive member 34 Retaining part 35 Bolt 41 First spherical seat 42 First spherical part 43 Second spherical seat 44 Second spherical part 45 Third spherical seat 46 No. 3 Spherical part 47 4th spherical seat 48 4th spherical part 51 1st plate-shaped member 52 2nd plate-shaped member 60 Fuel storage rack group 61 Pad 70 Flat plate 70a (of flat plate) Side surface 80 2nd damper part 81 2nd Cylinder part 82 2nd main body part 83 2nd concave part 84 2nd piston part 85 2nd convex part

Claims (20)

It is placed on the floor surface between the inner wall surface of the fuel pool and the outer peripheral surface of at least one fuel storage rack that is configured to accommodate fuel and is placed on the floor surface of the fuel pool. It ’s a damper device,
A cylinder portion having a main body portion that can abut on one of the inner wall surface and the outer peripheral surface and has a concave portion formed along the spacing direction between the inner wall surface and the outer peripheral surface, and the inner wall surface and the outer peripheral surface. At least one damper portion that can abut on the other side of the outer peripheral surface and includes a piston portion having a convex portion that is fitted into the concave portion.
A holding portion that holds at least one damper portion, and a holding portion.
With a rolling member provided in the holding portion and configured to be rollable on the floor surface.
Damper device with. The cylinder part is
A first contact portion capable of contacting one of the inner wall surface and the outer peripheral surface,
A concave spherical first spherical seat formed on one of the first contact portion and the main body portion,
A first spherical portion provided on the other side of the first contact portion and the main body portion, which is slidably engaged with the first spherical seat and the main body portion rotates to the first contact portion. With the first spherical part that is movably connected
The damper device according to claim 1, further comprising. The piston part is
A second contact portion capable of contacting the inner wall surface and the outer peripheral surface whichever the cylinder portion does not contact, and the second contact portion.
A concave spherical second spherical seat formed on one of the second contact portion and the convex portion, and
A second spherical portion provided on the other side of the second contact portion and the convex portion, which is slidably engaged with the second spherical seat and the convex portion is rotated to the second contact portion. With the second spherical part that is movably connected
The damper device according to claim 1 or 2, further comprising. It is placed on the floor surface between the inner wall surface of the fuel pool and the outer peripheral surface of at least one fuel storage rack that is configured to accommodate fuel and is placed on the floor surface of the fuel pool. It ’s a damper device,
A cylinder portion having a main body portion that can abut on one of the inner wall surface and the outer peripheral surface and has a concave portion formed along the spacing direction between the inner wall surface and the outer peripheral surface, and the inner wall surface and the outer peripheral surface. It has a plurality of damper portions including a piston portion having a convex portion fitted in the concave portion while being able to abut on the other side of the outer peripheral surface.
At least two of the main body portions of each cylinder portion of the plurality of damper portions are connected to one first plate-shaped member capable of contacting one of the inner wall surface and the outer peripheral surface. .. It is placed on the floor surface between the inner wall surface of the fuel pool and the outer peripheral surface of at least one fuel storage rack that is configured to accommodate fuel and is placed on the floor surface of the fuel pool. It ’s a damper device,
A cylinder portion having a main body portion that can abut on one of the inner wall surface and the outer peripheral surface and has a concave portion formed along the spacing direction between the inner wall surface and the outer peripheral surface, and the inner wall surface and the outer peripheral surface. It has a plurality of damper portions including a piston portion having a convex portion fitted in the concave portion while being able to abut on the other side of the outer peripheral surface.
At least two of the convex portions of the piston portions of the plurality of damper portions are in the form of one second plate capable of contacting the inner wall surface and the outer peripheral surface on which the cylinder portion does not abut. A damper device connected to a member. Any of claims 1 to 5, wherein the cylinder portion is provided with an elastic member configured to press the convex portion toward the inner wall surface or the outer peripheral surface to which the piston portion can come into contact. The damper device according to one item . A plate-shaped fluid resistance passive member is fixed to the convex portion so as to be located in the concave portion, and the fluid resistance passive member is configured such that the convex portion faces in a direction extending in the concave portion. The damper device according to any one of claims 1 to 6 . The cylinder portion is formed with a retaining portion for preventing the convex portion from coming out of the concave portion due to contact with the fluid resistance passive member when the convex portion slides in the direction of coming out of the concave portion. The damper device according to claim 7 . The invention according to any one of claims 1 to 5 , wherein the cylinder portion is formed with a through hole that communicates the space in the concave portion defined by the convex portion with the outside of the cylinder portion. Damper device. At least two of the main body portions of each cylinder portion of the plurality of damper portions are connected to one first plate-shaped member capable of contacting one of the inner wall surface and the outer peripheral surface. The damper device according to claim 5 . A concave spherical third spherical seat is formed on each of the at least two main bodies and one of the first plate-shaped members.
Slidably engages with the third spherical seat and rotatably connects the main body to each of the at least two main bodies and the other of the first plate-shaped members. The damper device according to claim 10 , wherein a third spherical portion is provided. At least two of the convex portions of the piston portions of the plurality of damper portions are one second plate capable of contacting the inner wall surface and the outer peripheral surface on which the cylinder portion does not abut. The damper device according to any one of claims 4 , 10 and 11 , which is connected to the shape member. A concave spherical fourth spherical seat is formed on each of the at least two convex portions and one of the second plate-shaped members.
Slidably engages with the fourth spherical seat and rotatably connects the convex portion to each of the at least two convex portions and the other of the second plate-shaped member. The damper device according to claim 12 , wherein a fourth spherical portion is provided. The damper device according to any one of claims 4 and 10 to 13 , wherein the first plate-shaped member is made of a radiation shielding material. The damper device according to any one of claims 5, 12 and 13, wherein the second plate-shaped member is made of a radiation shielding material. A holding portion that holds at least one damper portion, and a holding portion.
The damper device according to any one of claims 1 to 15 , further comprising a rolling member provided in the holding portion and configured to be rollable on the floor surface. The at least one fuel storage rack is mounted on a flat plate mounted on the floor surface.
The damper device is
A second cylinder having a second main body portion that can abut on one of the inner wall surface and the side surface of the flat plate and has a second recess formed along the spacing direction between the inner wall surface and the side surface. Department and
Claims 1 to 15 further include a second damper portion that can abut on the inner wall surface and the other side of the side surface, and further includes a second piston portion having a second convex portion fitted in the second concave portion. The damper device according to any one of the above. With the fuel pool,
With at least one fuel storage rack configured to accommodate fuel and resting on the floor of the fuel pool.
A fuel storage provided with at least one damper device according to any one of claims 1 to 17 , which is mounted on the floor surface between the inner wall surface of the fuel pool and the outer peripheral surface of the fuel storage rack. Facility. In the fuel pool, a plurality of the fuel storage racks are placed so as to form one fuel storage rack group.
The fuel storage facility according to claim 18 , wherein a plurality of damper devices are provided between the outer peripheral surface and the inner wall surface of the fuel storage rack group so as to surround the fuel storage rack group. The fuel storage facility according to claim 19 , wherein a pad is provided on each of the adjacent outer peripheral surfaces of the adjacent fuel storage racks so as to define a contact surface between the opposite outer peripheral surfaces.

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