JP2019095381A - Damper gear and fuel storage facility having damper gear - Google Patents

Abstract

To provide a damper gear that is easily installable in order to hold a fuel storage rack kept in a fuel pool, and a fuel storage facility having the damper gear.SOLUTION: A damper gear placed on a floor surface between the inner wall surface of a fuel pool and an outer circumferential surface of at least one fuel storage rack constituted so as to be capable of accommodating fuel and placed on the floor surface of the fuel pool, comprises: a cylinder unit capable of coming in contact with one of the inner wall surface and the outer circumferential surface and having a body unit in which a concavity recessed along the interval direction between the inner wall surface and the circumferential surface is formed; and at least one damper unit capable of coming in contact with the other of the inner wall surface and the outer circumferential surface and including a piston unit having a protrusion that is fitted into the concavity.SELECTED DRAWING: Figure 2

Description

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

  Spent fuel removed from the reactor or unused fuel installed in the reactor is accommodated 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, Patent Document 1 discloses a grid-like rack holding member having a plurality of openings into which the fuel storage rack can be inserted in the vertical direction. It is described to fix and insert the fuel storage rack into the opening to hold the fuel storage rack. Further, for example, in Patent Document 2, a cylinder having a recessed portion in which a piston is slidably fitted is fixed to the outer peripheral surface of a fuel storage rack, and the piston abuts on the inner wall surface of the fuel pool. It has been described that excessive vibration is suppressed.

JP, 2009-109302, A JP, 2017-83211, A

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

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

(1) A damper device according to at least one embodiment of the present disclosure,
It is mounted on the floor surface between an inner wall surface of the fuel pool and an outer peripheral surface of at least one fuel storage rack configured to be capable of containing fuel and mounted on the floor surface of the fuel pool A damper device,
A cylinder portion having a main body portion capable of coming into contact with one of the inner wall surface and the outer peripheral surface, and having a recessed portion recessed along a direction of an interval between the inner wall surface and the outer peripheral surface;
It has at least one damper part that includes: a piston part that can be in contact with the other of the inner wall surface and the outer peripheral surface, and has a convex part that is fitted into the concave part.

  According to the configuration of (1), even if the fuel storage rack moves toward the inner wall surface of the fuel pool by sliding or vibrating in the fuel pool, the convex portion fitted in the concave portion of the cylinder portion By receiving the load of the fuel storage rack, the fuel storage rack can be held. Further, since the damper device can be installed simply 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 contact.

  According to the configuration of (2), when the fuel storage rack pushes the convex portion into the concave portion, the convex portion can return to the state before the fuel storage rack pushes the convex portion into the concave portion by the elastic member. The convex portion can receive the load of the fuel storage rack even if the fuel storage rack moves again toward the inner wall surface of the fuel pool.

(3) In some embodiments, in the configuration of (1) or (2) above,
A plate-like fluid resistance passive member is fixed to the convex portion so as to be positioned in the concave portion, and the fluid resistance passive member is configured to face in a direction in which the convex portion extends in the concave portion.

  According to the configuration of (3), when the convex portion receives the load of the fuel storage rack and receives a force in the direction in which the convex portion is pushed into the concave portion, the fluid resistance passive member exerts fluid resistance from the cooling water in the concave portion. By receiving the load, 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 by the fluid resistance passive member coming into contact when the convex portion slides in the direction of coming out of the concave portion. ing.

  According to the structure of said (4), it can prevent that a convex part slips out of a recessed part by a securing part.

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

  According to the configuration of (5), when the convex portion receives the load of the fuel storage rack, the convex portion can slide in the concave portion by discharging the cooling water in the space through the through hole. The load of the fuel storage rack can be received gently 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. In addition, by adjusting the inner diameter of the through hole, the magnitude of the force required for the projection to slide in the recess can be adjusted, so the impact reduction effect on the fuel storage rack and the fuel pool can be adjusted. You can also

(6) In some embodiments, in any of the configurations of (1) to (5) above,
The cylinder unit is
A first contact portion that can contact 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;
A first spherical portion provided on the other of the first contact portion and the main body portion, the first spherical portion being slidably engaged with the first spherical seat so that the main portion rotates around the first contact portion And a first spherical portion operatively coupled thereto.

  According to the configuration of the above (6), even if the inner wall surface or the outer peripheral surface to which the first contact portion can contact is not completely flat or inclined with respect to the vertical direction, the first contact By rotating the main body with respect to the portion, the concave portion can be oriented along the direction of the distance 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 Thus, the fuel storage rack can be held.

(7) In some embodiments, in any of the configurations of (1) to (6) above,
The piston unit is
A second contact portion that can be in contact with the inner wall surface and the outer peripheral surface in the direction in which the cylinder portion does not contact;
A concave spherical second spherical seat formed on one of the second contact portion and the convex portion;
A second spherical portion provided on the other of the second contact portion and the convex portion, the second spherical portion being slidably engaged with the second spherical seat so that the convex portion is rotated around the second contact portion And a second spherical portion that is movably connected.

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

(8) In some embodiments, in any of the configurations of (1) to (5) above,
The damper device has a plurality of dampers,
At least two of the main body portions of the cylinder portions of the plurality of damper portions are connected to one first plate-like member that can contact one of the inner wall surface and the outer peripheral surface.

  According to the configuration of the above (8), since at least two main body portions are connected to the first plate-like member, the first plate-like member is compared to a configuration in which each main body portion is connected to different plate-like members. The area increases. Then, when the first plate member is in contact with the inner wall surface or the outer peripheral surface, the damper portion becomes difficult to separate by water pressure even if the first plate member is separated from the inner wall surface or the outer peripheral surface. Makes it easy to follow the movement of On the contrary, even if the fuel storage rack is directed to the damper device when the first plate 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 member do not easily collide with each other. The damper portion 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 body portions and one of the first plate-like members,
Each of the at least two main body portions and the other of the first plate-like member are slidably engaged with the third spherical seat to pivotally connect the main body portion to the first plate-like member The third spherical portion is provided.

  According to the configuration of the above (9), even if the inner wall surface or the outer peripheral surface with which the first plate member abuts is not completely flat or inclined with respect to the vertical direction, with respect to the first plate member By turning the main body portion, the concave portion can be directed along the direction of the distance 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. A storage rack can be held.

(10) In some embodiments, in any of the configurations of (1) to (5), (8) and (9) above,
The damper device has a plurality of dampers,
At least two of the convex portions of each piston portion of the plurality of damper portions may be in contact with one of the inner wall surface and the outer peripheral surface which is not in contact with the cylinder portion. It is connected to the member.

  According to the configuration of the above (10), since at least two convex portions are connected to the second plate-like member, the second plate-like member is different from the structure in which the respective convex portions are connected to different plate-like members. The area increases. Then, when the second plate member is in contact with the inner wall surface or the outer peripheral surface, the damper portion becomes difficult to separate by water pressure even if the second plate member is separated from the inner wall surface or the outer peripheral surface. Makes it easy to follow the movement of On the contrary, even if the fuel storage rack is directed to the damper device when the second plate 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 member do not easily collide with each other. The damper portion 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-like members,
Each of the at least two convex portions and the other of the second plate-like members are slidably engaged with the fourth spherical seat to rotatably connect the convex portions to the second plate-like member. The fourth spherical portion is provided.

  According to the configuration of the above (11), even if the inner wall surface or the outer peripheral surface with which the second plate member abuts is not completely flat or inclined with respect to the vertical direction, with respect to the second plate member By rotating the convex portion, the convex portion can be oriented along the direction of the distance between the inner wall surface and the outer peripheral surface, and therefore the convex portion fitted in the concave portion receives the load of the fuel storage rack. The fuel storage rack can be held.

(12) In some embodiments, in any of the configurations of (8) to (11) above,
At least one of the first plate member and the second plate member is formed of a radiation shielding material.

  The distance between the inner wall surface and the outer peripheral surface is limited by the shielding performance of the radiation. According to the configuration of the above (12), since the first plate-like member and the second plate-like member formed of the radiation shielding material can shield the radiation emitted from the fuel, from the viewpoint of shielding the radiation, the inner wall surface and It is possible to reduce the required distance from the outer circumferential surface. As a result, since the effective space for storing the fuel storage racks out of the space in the fuel pool is increased, more fuel storage racks can be stored.

  When lead is used as a radiation shielding material, lead is soft and easily deformed. Therefore, when the first plate member and the second plate member made of lead collide with the inner wall surface or the outer peripheral surface, the lead plate is deformed. The impact energy to the fuel storage rack and the fuel pool can be reduced because the energy of the impact can be absorbed.

(13) In some embodiments, in any of the configurations of (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 the above (13), after the damper device is installed in the fuel pool, the damper device can be fixed in place.

(14) In some embodiments, in any of the configurations of (1) to (12),
A holding unit for holding the at least one damper unit;
And a rolling member provided on the holding portion and configured to be able to roll on the floor surface.

  According to the configuration of the above (14), the damper device can be easily moved to the appropriate position in the fuel pool.

(15) In some embodiments, in any of the configurations of (1) to (12),
The at least one fuel storage rack is mounted on a flat plate mounted on the floor surface;
The damper device
A second cylinder having a second body portion that can be in contact with one of the inner wall surface and the side surface of the flat plate, and has a second recess recessed along the spacing direction between the inner wall surface and the side surface Department,
It further has a 2nd damper part which can be contacted to the above-mentioned inner wall face and the other of the above-mentioned side, and has the 2nd piston part which has the 2nd convex part inserted in the 2nd crevice.

  When re-racking an existing fuel storage facility, a flat plate is placed on the floor of the fuel pool. According to the configuration of the above (15), 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 retracking operation can be simplified.

(16) A fuel storage facility according to at least one embodiment of the present disclosure is:
With a fuel pool,
At least one fuel storage rack configured to contain fuel and mounted on the floor surface of the fuel pool;
At least one of any of the above (1) to (15) mounted movably 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. And two damper devices.

  According to the configuration of (16), even if the fuel storage rack moves toward the inner wall surface of the fuel pool by sliding or vibrating in the fuel pool, the convex portion fitted in the concave portion of the cylinder portion By receiving the load of the fuel storage rack, the fuel storage rack can be held. Further, since the damper device can be installed simply 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.

(17) In some embodiments, in the configuration of (16) above,
In the fuel pool, a plurality of the fuel storage racks are mounted 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 (17), by disposing the damper device so as to surround the fuel storage rack group, the risk of the fuel storage rack falling and slipping can be reduced.

(18) In some embodiments, in the configuration of (17) above,
Pads are provided on the opposing outer peripheral surfaces of the adjacent fuel storage racks to define the contact surfaces of the opposing outer peripheral surfaces.

  According to the configuration of the above (17), adjacent fuel storage racks are in contact with each other at the pad, so that the possibility of the fuel storage rack being damaged may be reduced by suppressing direct contact between the fuel storage racks. it can.

  According to at least one embodiment of the present disclosure, even if the fuel storage rack moves toward the inner wall surface of the fuel pool by sliding or vibrating in the fuel pool, it is embedded in the recess of the cylinder portion The fuel storage rack can be held by the convex portion receiving the load of the fuel storage rack. Further, since the damper device can be installed simply 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 showing composition of fuel storage equipment concerning Embodiment 1 of this indication. It is a sectional view showing composition of a damper part of a damper device concerning Embodiment 1 of this indication. It is a sectional view showing the composition of the damper part of the damper device concerning modification 1 of embodiment 1 of this indication. It is a sectional view showing the composition of the damper part of the damper device concerning modification 2 of embodiment 1 of this indication. It is a sectional view showing the composition of the damper part of the damper device concerning modification 3 of embodiment 1 of this indication. It is a sectional view showing the composition of the damper part of the damper device concerning modification 4 of embodiment 1 of this indication. 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 indication. It is a figure showing composition of a damper device concerning modification 6 of embodiment 1 of this indication. It is a sectional view showing the composition of the damper part of the damper device concerning modification 7 of embodiment 1 of this indication. It is a figure showing composition of a damper device concerning modification 8 of embodiment 1 of this indication. It is a figure which shows the structure of the damper apparatus which concerns on the modification 9 of Embodiment 1 of this indication. It is a top view which shows the structure of the fuel storage installation which concerns on Embodiment 2 of this indication. FIG. 7 is a partial enlarged plan view of adjacent fuel storage racks in a fuel storage facility according to Embodiment 2 of the present disclosure. It is a figure which shows the structure of the fuel storage equipment which concerns on Embodiment 3 of this indication.

  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 components described in the following embodiments are not intended to limit the scope of the present invention, but merely illustrative 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 cooling water is stored and on the floor surface 2 a of the fuel pool 2 in the fuel pool 2. The fuel storage rack 3 includes at least one fuel storage rack 3 and a damper device 4 mounted between the outer peripheral surface 3 a of the fuel storage rack 3 and the inner wall surface 2 b of the fuel pool 2 in the fuel pool 2.

  The fuel storage rack 3 has a rectangular parallelepiped shape whose upper portion is opened so as to be able to accommodate a plurality of fuels 5 (spent fuel or unused fuel) inside. A plurality of leg portions 3b 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 can slide on the floor surface 2a.

  The damper device 4 includes at least one damper unit 10 and a holding unit 11 for holding the damper unit 10. The holding portion 11 includes a base portion 11 a for mounting the damper device 4 on the floor surface 2 a. 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 only by mounting the base portion 11a on the floor surface 2a between the inner wall surface 2b and the outer peripheral surface 3a in the fuel pool 2, the damper device 4 can be easily made. It can be installed. In particular, installation of the damper apparatus 4 becomes very easy with respect to the existing installation.

  As shown in FIG. 2, the damper unit 10 has a cylindrical cylinder unit 20 and a piston unit 30. The cylinder portion 20 is connected to the first plate-like contact portion 21 configured to be able to abut on the inner wall surface 2b, and to the first contact portion 21, and the space direction between the inner wall surface 2b and the outer peripheral surface 3a And a main body 22 in which a recess 23 is formed. The piston portion 30 is configured to be connected to the second contact portion 31 and to be fitted into the recess 23 while being connected to the second contact portion 31 having a circular plate shape configured to be able to contact the outer peripheral surface 3a. And a convex portion 32. In the space 24 in the recess 23 defined by the convex portion 32, there is cooling water that has flowed in when the damper device 4 (see FIG. 1) is installed in the fuel pool 2. Between the outer peripheral surface of the convex portion 32 and the inner peripheral surface of the recess 23, a very small gap 25 communicating the space 24 with the inside of the fuel pool 2 is formed.

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 etc., 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 protrusion 32 into the recess 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 pushes the projection 32 into the recess 23 instantaneously by the fuel storage rack 3 moving toward the inner wall surface 2 b. When such a load is applied to the convex portion 32, drainage from the space 24 through the gap 25 is difficult to occur, so the convex portion 32 is a concave portion 23 unless the load of the fuel storage rack 3 is extremely large and long. The convex portion 32 receives the load of the fuel storage rack 3 so that 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, as in the case where the heat generated from the fuel 5 (see FIG. 1) causes the protrusion 32 to thermally expand along the recess 23, the drainage of the cooling water from the space 24 through the gap 25 is very slow. In this case, since the cooling water can be drained through the gap 25, the convex portion 32 can thermally expand 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 support rod instead of the damper device 4 (see FIG. 1), the fuel storage rack 3 is unnecessarily stressed by the thermal expansion of the support rod. Although there is a possibility, by using the damper device 4, it is possible to appropriately cope with the thermal expansion due to the heat generated from the fuel 5.

  Thus, even if the fuel storage rack 3 moves toward the inner wall surface 2b of the fuel pool 2 by sliding or vibrating in the fuel pool 2, the convex portion fitted in the recess 23 of the cylinder portion 20 The load 32 of the fuel storage rack 3 can hold the fuel storage rack 3. Moreover, since the damper device 4 can be installed simply by placing it on the floor surface 2 a of the fuel pool 2 between the inner wall surface 2 b of the fuel pool 2 and the outer peripheral surface 3 a of the fuel storage rack 3, the damper device 4 is easy It can be installed on

  In the first embodiment, the damper device 4 includes the damper portion 10 including the cylinder portion 20 having the main body portion 22 in which the recess 23 is formed, and the piston portion 32 having the protrusion 32. It is not limited to the following form. Below, the modifications 1-9 of the damper apparatus 4 are demonstrated. In the first to ninth modifications, the same components as those of the first embodiment are designated by the same reference numerals, and the detailed description thereof is omitted.

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

  Incidentally, 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 provided. 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 that the protrusion 32 hardly slides in the recess 23 as in the first embodiment.

(Modification 2)
As shown in FIG. 4, the convex portion 32 is fixed so that a plate-like fluid resistance passive member 33 configured to face the direction in which the convex portion 32 extends in the concave portion 23 is positioned in the concave portion 23. It is done. Although not an essential configuration, the main body portion 22 contacts the fluid resistance passive member 33 when the convex portion 32 slides in the direction (left direction in FIG. 4) in which the convex portion 32 gets out of the concave portion 32. A retaining portion 34 may be formed to prevent it from coming off. The retaining portion 34 is, for example, an annular plate member provided along the circumferential direction of the inner circumferential surface of the recess 23. The annular plate 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 protrusion 32 from being removed from the recess 23.

  In the second modification, when the protrusion 32 receives the load of the fuel storage rack 3 and receives a force in the direction in which the protrusion 32 is pushed into the recess 23, the fluid resistance passive member 33 receives fluid from the cooling water in the space 24. By receiving the resistance, the convex portion 32 can receive a larger load. Thereby, the fuel storage rack 3 can be held more securely.

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

(Modification 4)
As shown in FIG. 6, in the recess 23, a plate spring 27 b which is an elastic member 27 configured to be capable of pressing the protrusion 32 toward the outer peripheral surface 3 a is provided. As in the third modification, when the fuel storage rack 3 pushes the protrusion 32 into the recess 23, the plate spring 27 b causes the protrusion 32 to move before the fuel storage rack 3 pushes the protrusion 32 into the recess 23. You can go back to Thus, even if the fuel storage rack 3 moves again toward the inner wall surface 2 b of the fuel pool 2, the protrusions 32 can receive the load of the fuel storage rack 3.

  In addition, if the convex portion 32 and the plate spring 27b are in contact with each other when the damper device 4 (see FIG. 1) is installed, the plate spring 27b bends appropriately when the convex portion 32 thermally expands, and the plate spring 27b Initial load is applied to the projection 32. The space 24 is partitioned by the plate spring 27b into a first space 24a and a second space 24b communicating with each other through the hole 27b1 formed in the plate spring 27b, but the convex portion 32 and the plate spring 27b contact each other. By sealing the second space 24b on the side opposite to the convex portion 32 with respect to the plate spring 27b, the convex portion 32 can not be pushed further, and the convex portion 32 is more firmly attached to the fuel storage rack 3. It can receive a load.

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

(Modification 6)
As shown in FIG. 8, the base portion 11 a is provided with a roller 12 a which is a rolling member 12 configured to be able to roll on the floor surface 2 a. The rolling member 12 is not limited to the roller 12a, and any known member that can roll on the floor surface 2a, such as a wheel, can be used. The roller 12a can facilitate moving the damper device 4 to a suitable position 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. 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 in the first contact portion 21, and the first spherical seat 41 may be formed in the main body portion 22.

  The piston portion 30 further includes 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 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 Since the concave portions 23 and the convex portions 32 can be oriented along the direction of the distance between the inner wall surface 2 b and the outer peripheral surface 3 a by the respective rotations 32, the convex portions 32 fitted in the concave portions 23 The fuel storage rack 3 can be held by receiving the load of the rack 3. Incidentally, the first spherical seat 41 and the first spherical portion 42 may be formed and provided only in the cylinder portion 20, and the second spherical seat 43 and the second spherical portion 44 may be formed and provided only in the piston portion 30. May be

(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-like member 51 configured to be able to abut on the inner wall surface 2b, and each convex portion 32 is It is connected to one flat second plate-like member 52 configured to be able to abut on the outer peripheral surface 3a. Only the first plate member 51 may be provided, or the second plate member 52 may be provided.

  Since each body 22 and each protrusion 32 are connected to the first plate member 51 and the second plate member 52, each body 22 and each protrusion 32 are connected to separate plate members. The area of the first plate member 51 and the second plate member 52 is larger than that of the above configuration. Then, when the first plate member 51 is in contact with the inner wall surface 2b and the second plate member 52 is in contact with the outer peripheral surface 3a, the first plate member 51 and the second plate member 52 are the inner wall surface 2b and Even if it is separated from the outer peripheral surface 3 a, it becomes difficult to separate by the water pressure, so the damper portion 10 easily follows the movement of the fuel storage rack 3. Conversely, even if the fuel storage rack 3 faces the damper device 4 when the first plate member 51 and the second plate member 52 are separated from the inner wall surface 2b and the outer peripheral surface 3a, respectively, the inner wall surface 2b and The damper portion 10 can gently receive the load of the fuel storage rack 3 because each of the outer peripheral surface 3 a is less likely to collide with each of the first plate member and the second plate member 52. 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 member 51 and the second plate member 52 having a large area is in contact with each of 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 the eighth modification, each of the first plate member 51 and the second plate member 52 is one plate member, but may be divided into two or more members. If it is a plate-like member to which at least two body parts 22 and convex parts 32 are respectively connected, each plate-like member compared with the composition where each main body part 22 and each convex part 32 were respectively connected to separate plate-like members Since the area of is increased, an effect close to the above effect can be obtained.

  Further, at least one of the first plate member 51 and the second plate 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 shielding performance of the radiation. Since lead can block radiation emitted from the fuel 5 (see FIG. 1) by the first plate-like member 51 and the second plate-like member 52 due to high radiation shielding performance, from the viewpoint of radiation shielding, The space required between the wall surface 2b and the outer peripheral surface 3a can be reduced. As a result, the effective space for storing the fuel storage racks 3 out of the space in the fuel pool 2 is increased, so that more fuel storage racks 3 can be stored.

  Further, since lead is soft and easily deformed, the first plate member 51 and the second plate member 52 made of lead collide with the inner wall surface 2b or the outer peripheral surface 3a to absorb energy of collision by deformation. As a result, the impact on the fuel storage rack 3 and the fuel pool 2 can be reduced.

(Modification 9)
The ninth modification is a combination of the seventh and eighth modifications. As shown in FIG. 11, the cylinder portion 20 has a concave spherical third spherical seat 45 formed on the first plate member 51 and a third spherical portion 46 provided on the main body portion 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-like member 51. The third spherical portion 46 may be provided in the first plate-like member 51, and the third spherical seat 45 may be formed in the main body portion 22.

  The piston portion 30 further has a concave spherical fourth spherical seat 47 formed on the second plate 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-like member 52. The fourth spherical portion 48 may be provided in the second plate-like member 52, and the fourth spherical seat 47 may be formed in the convex portion 32.

  Even if the inner wall surface 2b and the outer peripheral surface 3a are not completely flat or inclined with respect to the vertical direction, the main body portion 22 and the convex portion with respect to the first plate member 51 and the second plate member 52 Since the concave portions 23 and the convex portions 32 can be oriented along the direction of the distance between the inner wall surface 2 b and the outer peripheral surface 3 a by the respective rotations 32, the convex portions 32 fitted in the concave portions 23 The fuel storage rack 3 can be held by receiving the load of the rack 3. Incidentally, the third spherical seat 45 and the third spherical portion 46 may be formed and provided only in the cylinder portion 20, and the fourth spherical seat 47 and the fourth spherical portion 48 are formed and provided only in the piston portion 30. May be

  In the above variations 1 to 9, two or more variations can be arbitrarily combined as long as they do not contradict each other.

  In Embodiment 1 and Modifications 1 to 9, the cylinder portion 20 can abut against the inner wall surface 2b, and the piston portion 30 can abut against the outer circumferential surface 3a, but the cylinder portion 20 abuts against the outer circumferential surface 3a It is possible and piston part 30 may be able to contact inner wall 2b. In addition, when the damper device 4 has a plurality of damper portions 10, at least one of the damper device 4 can contact the cylinder portion 20 with the inner wall surface 2b and can contact the piston portion 30 with the outer peripheral surface 3a. The damper portion may include at least one damper portion that can contact the outer peripheral surface 3a and the piston portion 30 can contact 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. However, the present invention is not limited to this embodiment. . The first contact portion 21 and the second contact portion 31 do not exist, and 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 is the inner wall surface 2b and the outer peripheral surface 3a It may be able to directly abut on the other.

  In Embodiment 1 and Modifications 1 to 9, the fuel storage rack 3 is a free standing rack, but the fuel storage rack is fixed to the floor surface 2a or supported on the inner wall surface 2b. It may be. Even with such a fuel storage rack, it is possible that the fuel pool 2 vibrates due to the vibration of the fuel pool 2. Therefore, the convex portion 32 receives a load caused by the movement of the fuel storage rack toward the inner wall surface 2b. Vibration can be damped.

  In Embodiment 1 and Modifications 1 to 9, the damper device 4 includes the damper portion 10 having the cylinder portion 20 and the piston portion 30 having the convex portion 32 which can be pushed into the concave portion 23 of the cylinder portion 20. It is not limited to this form. The damper device 4 may have a member having a configuration that does not deform even under the load of the fuel storage rack 3 instead of the damper portion 10, for example, a rigid member such as a polygonal column shape, a cylindrical shape or a rod shape.

Second Embodiment
Next, a fuel storage facility according to a second embodiment will be described. The fuel storage facility according to the second embodiment is limited to the case of storing two or more fuel storage racks 3 in the fuel pool 2 as compared with the first embodiment. In the second embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and the detailed description thereof is omitted.

  As shown in FIG. 12, in the fuel pool 2, a plurality of fuel storage racks 3 gather to form one fuel storage rack group 60 while 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 circumferential surface 60 a and the inner wall surface 2 b of the fuel storage rack group 60 so as to surround the fuel storage rack group 60. The other configuration is the same as that of the first embodiment. Note that any one of the modifications 1 to 9 of the first embodiment or a combination of any two or more of them can be applied to the damper device 4.

  The operation of the damper device 4 for holding 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 disposing the damper device 4 so as to surround the fuel storage rack group 60, the risk of the fuel storage rack 3 falling and slipping can be reduced.

  In the second embodiment, as shown in FIG. 13, pads 61 may be provided on the facing outer peripheral surfaces 3 a of adjacent fuel storage racks 3 to define the contact surfaces of the facing outer peripheral surfaces 3 a. The adjacent fuel storage racks 3 are in contact with each other at the pad 61. Therefore, by preventing the fuel storage racks 3 from being in direct contact with each other, the risk of damage to the fuel storage racks 3 can be reduced.

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

  As shown in FIG. 14, a flat plate 70 is placed on the floor 2 a 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 3 a of the fuel storage rack 3 and the inner wall surface 2 b of the fuel pool 2. The damper device 4 includes the damper unit 10 of the first embodiment and a second damper unit 80 provided at the lower end of the holding unit 11.

  The second damper portion 80 is capable of coming into contact with the inner wall surface 2 b and has a second main portion 82 in which a second recess 83 is formed along the direction of the distance between the inner wall surface 2 b and the side surface 70 a of the flat plate 70. And a second piston portion 84 having a second convex portion 85 which can be in contact with the side surface 70 a and which 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 70 a of the flat plate 70. The other configuration is the same as that of the first embodiment. Note that any of the modifications 1 to 9 of the first embodiment or a combination of two or more of them can be applied to the configuration of the damper device 4 other than the second damper unit 80, and The 2-damper portion 80 can be applied with any one of the first to fifth modifications of the first embodiment or a combination of two or more of them.

  In the third embodiment, the damper unit 10 can hold the fuel storage rack 3 as in the first embodiment, and the second damper unit 80 can also hold the flat plate 70. When the existing fuel storage facility is reracked, the flat plate 70 is placed on the floor surface 2 of the fuel pool 2, but since the second damper unit 80 can hold the flat plate 70, the flat plate 70 can be used as the fuel pool 2. There is no need to fix them, and the re-racking operation can be simplified.

  In the third embodiment, the second cylinder portion 81 can abut against the inner wall surface 2b and the second piston portion 84 can abut against the side surface 70a of the flat plate 70. However, the second cylinder portion 81 can be a flat plate The second piston portion 84 may be able to abut on the inner wall surface 2b while being able to abut on the side surface 70a of 70.

DESCRIPTION OF SYMBOLS 1 Fuel storage installation 2 Fuel pool 2a Floor surface 2b (of fuel pool) Inner wall surface 3 (of fuel pool) Fuel storage rack 3a Outer peripheral surface 3b (of fuel storage rack) Leg part 4 Damper device 5 Fuel 10 Damper part 11 Holding part 11a Base portion 12 Rolling member 12a Roller 20 Cylinder portion 21 First contact portion 22 Body portion 23 Recess 24 Space 24a First space 24b Second space 25 Clearance 26 Through hole 27 Elastic member 27a Spring 27b Leaf spring 27b1 Hole 28 bolt Reference Signs List 30 piston portion 31 second contact portion 32 convex portion 33 fluid resistance passive member 34 retaining portion 35 bolt 41 first spherical seat 42 first spherical portion 43 second spherical seat 44 second spherical portion 45 third spherical seat 46 3 spherical portion 47 fourth spherical seat 48 fourth spherical portion 51 first plate member 52 second plate member 60 fuel storage rack group 61 pad 70 flat plate DOO 70a (flat plate) side 80 second damper part 81 and the second cylinder portion 82 the second body portion 83 the second recess 84 the second piston portion 85 second projecting portion

Claims (18)

It is mounted on the floor surface between an inner wall surface of the fuel pool and an outer peripheral surface of at least one fuel storage rack configured to be capable of containing fuel and mounted on the floor surface of the fuel pool A damper device,
A cylinder portion having a main body portion capable of coming into contact with one of the inner wall surface and the outer peripheral surface, and having a recessed portion recessed along a direction of an interval between the inner wall surface and the outer peripheral surface;
A damper device comprising: at least one damper portion that can be in contact with the other of the inner wall surface and the outer peripheral surface, and includes a piston portion having a convex portion fitted into the concave portion.   The damper according to claim 1, 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 contact. apparatus.   A plate-like 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 to face the direction in which the convex portion extends in the concave portion. The damper device according to claim 1.   The cylinder portion is formed with a retaining portion for preventing the convex portion from coming out of the concave portion by the fluid resistance passive member coming into contact when the convex portion slides in the direction of coming out of the concave portion. The damper device according to claim 3.   The damper device according to claim 1, wherein the cylinder portion is formed with a through hole communicating the space in the recess defined by the convex portion with the outside of the cylinder. The cylinder unit is
A first contact portion that can contact 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;
A first spherical portion provided on the other of the first contact portion and the main body portion, the first spherical portion being slidably engaged with the first spherical seat so that the main portion rotates around the first contact portion The damper device according to any one of claims 1 to 5, further comprising: a first spherical portion that is movably connected. The piston unit is
A second contact portion that can be in contact with the inner wall surface and the outer peripheral surface in the direction in which the cylinder portion does not contact;
A concave spherical second spherical seat formed on one of the second contact portion and the convex portion;
A second spherical portion provided on the other of the second contact portion and the convex portion, the second spherical portion being slidably engaged with the second spherical seat so that the convex portion is rotated around the second contact portion The damper device according to any one of claims 1 to 6, further comprising a second spherical portion that is movably connected. The damper device has a plurality of dampers,
At least two of the main body portions of the cylinder portions of the plurality of damper portions are connected to one first plate-like member that can be in contact with one of the inner wall surface and the outer peripheral surface. The damper device according to any one of Items 1 to 5. A concave spherical third spherical seat is formed on each of the at least two main body portions and one of the first plate-like members,
Each of the at least two main body portions and the other of the first plate-like member are slidably engaged with the third spherical seat to pivotally connect the main body portion to the first plate-like member The damper device according to claim 8, wherein a third spherical portion is provided. The damper device has a plurality of dampers,
At least two of the convex portions of each piston portion of the plurality of damper portions may be in contact with one of the inner wall surface and the outer peripheral surface which is not in contact with the cylinder portion. The damper apparatus as described in any one of Claims 1-5, 8 and 9 connected to the member. A concave spherical fourth spherical seat is formed on each of the at least two convex portions and one of the second plate-like members,
Each of the at least two convex portions and the other of the second plate-like members are slidably engaged with the fourth spherical seat to rotatably connect the convex portions to the second plate-like member. The damper device according to claim 10, wherein a fourth spherical portion is provided.   The damper device according to any one of claims 8 to 11, wherein at least one of the first plate member and the second plate member is formed of a radiation shielding material.   The damper device according to any one of claims 1 to 5, wherein at least one of the cylinder portion and the piston portion is fixed to the inner wall surface or the outer peripheral surface. A holding unit for holding the at least one damper unit;
The damper device according to any one of claims 1 to 12, further comprising: a rolling member provided in the holding portion and configured to roll 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
A second cylinder having a second body portion that can be in contact with one of the inner wall surface and the side surface of the flat plate, and has a second recess recessed along the spacing direction between the inner wall surface and the side surface Department,
13. The method according to claim 1, further comprising: a second damper portion including a second piston portion having a second convex portion that can be in contact with the other of the inner wall surface and the side surface and that is fitted into the second concave portion. The damper device according to any one of the above. With a fuel pool,
At least one fuel storage rack configured to contain fuel and mounted on the floor surface of the fuel pool;
The fuel storage provided with at least one damper device according to any one of claims 1 to 15 mounted on the floor surface between an inner wall surface of the fuel pool and an outer peripheral surface of the fuel storage rack. Facility. In the fuel pool, a plurality of the fuel storage racks are mounted so as to form one fuel storage rack group;
The fuel storage facility according to claim 16, wherein a plurality of damper devices are provided between the outer peripheral surface of the fuel storage rack group and the inner wall surface so as to surround the fuel storage rack group.   18. The fuel storage facility according to claim 17, wherein a pad for defining a contact surface between the opposing outer peripheral surfaces is provided on the opposing outer peripheral surface of each of the adjacent fuel storage racks.

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