JP2019007792A - Nuclear fuel storage facility - Google Patents

Abstract

To provide a nuclear fuel storage facility capable of suppressing a nuclear fuel storage rack from horizontal movement or rocking with a simple structure.SOLUTION: The nuclear fuel storage facility comprises: wall side rack cell groups 55, 61, 64, 66, 72, 75, 78 and 81 which are in contact with inside surfaces 31a-34a of wall parts 31-34 in a nuclear fuel storage pit 11; storage rack cell groups 56,62,65,67,73,76,79,82 which are constituted of rack cells 53 disposed inside the wall side rack cell groups 55, 61, 64, 66, 72, 75, 78 and 81; and multiple nuclear fuel rods 59 each of which is stored in the rack cell 53 only in the storage rack cell groups 56, 62, 65, 67, 73, 76, 79 and 82.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a nuclear fuel storage facility.

The spent nuclear fuel taken out from the nuclear reactor is stored and cooled in a nuclear fuel storage pit in the nuclear power plant until it is carried out to a reuse facility.
Specifically, spent nuclear fuel is stored and cooled by accommodating spent nuclear fuel rods in a nuclear fuel storage rack disposed in the water in the nuclear fuel storage pit.

  As a nuclear fuel storage rack, there is a free standing rack that is not fixed to the wall or floor of a nuclear fuel storage pit (see, for example, Patent Document 1). A plurality of free standing racks are arranged in the nuclear fuel storage pit. Adjacent free standing racks are connected by a connecting member.

  Patent Document 1 discloses providing a rack support structure that protrudes in the vertical direction from the bottom surface of the nuclear fuel storage pit and fits with the rack. The rack is disposed in the nuclear fuel storage pit in a state of being separated from the wall portion of the nuclear fuel storage pit.

JP-A-2015-197334

  However, in the case of Patent Document 1, the rack support structure may be damaged when the rack receives a large force in the horizontal direction due to an earthquake or the like. As described above, when the rack support structure is damaged, the rack moves in the horizontal direction and the rack collides with the wall portion of the nuclear fuel storage pit, which may damage the wall portion of the nuclear fuel storage pit.

In addition, by placing the rack in the nuclear fuel storage pit while being separated from the wall of the nuclear fuel storage pit, the rack may be locked due to an earthquake or the like, and the bottom (floor) of the nuclear fuel storage pit may be damaged. was there.
Furthermore, in Patent Document 1, since it is necessary to provide a rack support structure on the bottom surface of the nuclear fuel storage pit, it is complicated.

  Therefore, an object of the present invention is to provide a nuclear fuel storage facility that can suppress the horizontal movement and locking of the nuclear fuel storage rack with a simple configuration.

  In order to solve the above-described problem, a nuclear fuel storage facility according to an aspect of the present invention includes a nuclear fuel storage pit in which water is stored, and an inner side that is disposed in water in the nuclear fuel storage pit and extends in a vertical direction. A nuclear fuel storage rack in which a plurality of rack cells having spaces are arranged in a lattice pattern, and the nuclear fuel storage rack is a rack cell arranged on the inner side of the wall portion of the nuclear fuel storage pit among the plurality of rack cells. The wall-side rack cell group is configured to include a storage rack cell group configured by rack cells disposed inside the wall-side rack cell group, and the wall-side rack cell group includes a wall of the nuclear fuel storage pit. Used nuclei that are in contact with the inner side surface of the unit and are accommodated only in the rack cells of the accommodation rack cell group out of the wall-side rack cell group and the accommodation rack cell group Fee, further comprising: a.

  According to the present invention, the wall-side rack cell group is disposed on the inner surface side of the wall portion of the nuclear fuel storage pit and is in contact with the inner surface of the wall portion of the nuclear fuel storage pit. The side surfaces of the side rack cell group can be brought into surface contact. Thereby, it is possible to suppress the horizontal movement of the nuclear fuel storage rack and the occurrence of rocking of the nuclear fuel storage rack with a simple configuration.

  In addition, the spent nuclear fuel and the nuclear fuel storage pits are accommodated by accommodating the spent nuclear fuel only in the rack cell of the accommodating rack cell group arranged inside the wall side rack cell group among the wall side rack cell group and the accommodating rack cell group. A sufficient distance from the inner surface of the wall portion can be secured. Thereby, after ensuring safety | security, the inner surface of the wall part of a nuclear fuel storage pit and the wall side rack cell group can be made to contact.

  In the nuclear fuel storage facility according to one aspect of the present invention, a plurality of the nuclear fuel storage racks may be provided, and a connecting member that connects the nuclear fuel storage racks adjacent to each other may be provided.

  As described above, since the plurality of nuclear fuel storage racks are connected by providing the connecting members that connect the nuclear fuel storage racks adjacent to each other, it is possible to suppress the nuclear fuel storage racks from moving apart. As a result, when slippage occurs in a plurality of nuclear fuel storage racks due to the occurrence of an earthquake or the like, the inner side surface of the wall portion is pressed by the side surfaces of the plurality of nuclear fuel storage racks, so that the nuclear fuel storage pit is damaged. Can be suppressed.

  Further, in the nuclear fuel storage facility according to one aspect of the present invention, a plurality of wall portions of the nuclear fuel storage pit are provided, and an inner side surface of the plurality of wall portions includes a plurality of the nuclear fuel storage racks. It may be in contact with any nuclear fuel storage rack.

As described above, the inner surfaces of the plurality of wall portions of the nuclear fuel storage pit come into contact with any one of the plurality of nuclear fuel storage racks, so that the periphery (side surface) of the rack group including the plurality of nuclear fuel storage racks ) And the inner surface of the wall portion of the nuclear fuel storage pit can be brought into contact with each other.
Thereby, it is possible to suppress the horizontal movement of the plurality of nuclear fuel storage racks and the occurrence of rocking of the plurality of nuclear fuel storage racks with a simple configuration.

  The nuclear fuel storage facility according to one aspect of the present invention may further include a radiation shielding member that is disposed in the rack cell constituting the wall-side rack cell group and shields radiation emitted from the used nuclear fuel.

  Thus, by providing the radiation shielding member arranged in the rack cells constituting the wall-side rack cell group, it is possible to shield the radiation emitted from the spent nuclear fuel. As a result, it is possible to reduce the number of rack cells constituting the wall-side rack cell group disposed in the direction from the inner side surface of the wall portion of the nuclear fuel storage pit to the accommodating rack cell group. That is, it is possible to increase the number of rack cells constituting the accommodating rack cell group. Thereby, the number of the used nuclear fuel (nuclear fuel rod) which can be accommodated in the rack cell group for accommodation can be increased.

  In the nuclear fuel storage facility according to one aspect of the present invention, the wall-side rack cell group may have a notch provided on the inner side surface of the wall.

  As described above, the wall-side rack cell group has the notch portion provided on the inner surface side of the wall portion, so that the structure can be avoided even when the structure is provided on the inner surface of the wall portion. The side surface of the rack cell group and the inner side surface of the wall portion can be brought into contact with each other.

  The nuclear fuel storage facility according to one aspect of the present invention may further include a spacer disposed between adjacent nuclear fuel storage racks among the nuclear fuel storage racks.

  In this way, by providing the spacers arranged between the nuclear fuel storage racks adjacent to each other, the nuclear fuel storage rack takes into account the thermal expansion, and the inner side surface of the wall portion of the nuclear fuel storage pit and the wall side rack cell group It is possible to suppress the formation of a gap between the two.

  The nuclear fuel storage facility according to one aspect of the present invention may include an elastic body sandwiched between adjacent nuclear fuel storage racks among the nuclear fuel storage racks.

  As described above, by providing the elastic body sandwiched between the nuclear fuel storage racks adjacent to each other, the state in which the side surface of the wall side rack cell group is pressed against the inner side surface of the wall portion of the nuclear fuel storage pit is maintained. It becomes possible. Thereby, it can suppress that a clearance gap is formed between the inner surface of the wall part of a nuclear fuel storage pit, and a wall side rack cell group.

  In the nuclear fuel storage facility according to one aspect of the present invention, the wall-side rack cell group may be detachable from the accommodation rack cell group.

  As described above, the wall-side rack cell group can be attached to and detached from the housing rack cell group, so that when the wall-side rack cell group is damaged, only the wall-side rack cell group needs to be replaced, thereby reducing costs. be able to.

  According to the present invention, horizontal movement and locking of the nuclear fuel storage rack can be suppressed with a simple configuration.

1 is a plan view schematically showing a schematic configuration of a nuclear fuel storage facility according to a first embodiment of the present invention. It is a sectional view of A ₁ -A ₂ along the line of the nuclear fuel storage facility shown in FIG. It is a perspective view of the nuclear fuel storage rack shown in FIG. It is a side view of the part corresponding to the area | region B shown in FIG. It is a top view which shows typically schematic structure of the nuclear fuel storage equipment which concerns on the 2nd Embodiment of this invention. It is a top view which shows typically schematic structure of the nuclear fuel storage equipment which concerns on the 3rd Embodiment of this invention. It is a top view of the nuclear fuel storage rack which concerns on the 4th Embodiment of this invention. It is a top view which shows typically schematic structure of the nuclear fuel storage equipment which concerns on the 5th Embodiment of this invention.

  Embodiments to which the present invention is applied will be described below in detail with reference to the drawings.

(First embodiment)
The nuclear fuel storage facility 10 of the first embodiment will be described with reference to FIGS. In FIG. 2, the nuclear fuel storage rack 24 shown in FIG. 1 is illustrated in a simplified manner. FIG. 3 is a perspective view of the nuclear fuel storage racks 24 and 25 among the nuclear fuel storage racks 21 to 29 shown in FIG. In FIG. 3, the nuclear fuel storage rack 24 is illustrated with a part cut away.
1 and 3, X indicates the width direction of the nuclear fuel storage pit 11. 1-4, the Y direction indicates the length direction of the nuclear fuel storage pits 11 orthogonal to the X direction. 2 to 4, the Z direction indicates a vertical direction orthogonal to the X direction and the Y direction. 1-4, the same code | symbol is attached | subjected to the same component.

  The nuclear fuel storage facility 10 according to the first embodiment includes a nuclear fuel storage pit 11, nuclear fuel storage racks 21 to 29, and a plurality of connecting members 30.

The nuclear fuel storage pit 11 is a pit (pool) in which cooling water 36 is stored. The nuclear fuel storage pit 11 has walls 31 to 34 and a bottom 35.
The wall portion 31 has an inner side surface 31a that is orthogonal to the Y direction and extends in the X direction and the Z direction. The wall portion 32 has an inner side surface 32a that is orthogonal to the X direction and extends in the Y direction and the Z direction.

  The wall portion 33 has an inner side surface 33a that is orthogonal to the Y direction and extends in the X direction and the Z direction. The inner side surface 33a faces the inner side surface 31a in the Y direction. The wall 34 has an inner side surface 34a that is orthogonal to the X direction and extends in the Y direction and the Z direction. The inner side surface 34a faces the inner side surface 32a in the Y direction. The wall portions 31 to 34 partition the periphery of the nuclear fuel storage pit 11.

  The bottom part 35 has connected the lower end part of the wall parts 31-34. The bottom portion 35 has a bottom surface 35a that is orthogonal to the Z direction and extends in the X direction and the Y direction. The bottom surface 35 a defines the bottom of the nuclear fuel storage pit 11.

  The depth of the nuclear fuel storage pit 11 configured as described above is configured to be deeper than the height value of the nuclear fuel storage racks 21 to 29.

The nuclear fuel storage racks 21 to 29 are arranged in a grid pattern in the horizontal plane direction (specifically, the X direction and the Y direction) so as to be adjacent to each other. The nuclear fuel storage racks 21 to 29 are arranged in the nuclear fuel storage pit 11 while being connected by a plurality of connecting members 30.
The nuclear fuel storage racks 21 to 29 are arranged on the bottom surface 35 a of the nuclear fuel storage pit 11 in a state where they are not fixed to the walls 31 to 34 and the bottom 35 of the nuclear fuel storage pit 11. The nuclear fuel storage racks 21 to 29 are free standing racks. The nuclear fuel storage racks 21 to 29 are immersed in the water 36. The nuclear fuel storage racks 21 to 29 constitute a nuclear fuel storage rack group 20.

  Here, the nuclear fuel storage rack 24 will be described. The nuclear fuel storage rack 24 includes a base plate 40, a plurality of legs 41, a lower support lattice 43, a middle support lattice 45, an upper support lattice 47, and outer peripheral plates 48 and 49 that constitute a support lattice member. It has a plurality of rack cells 53, a wall-side rack cell group 55, a storage rack cell group 56, and a nuclear fuel rod 59 that is a used nuclear fuel.

The base plate 40 is a rectangular metal plate.
The plurality of leg portions 41 are provided on the lower surface of the base plate 40. The plurality of leg portions 41 support the base plate 40. The plurality of leg portions 41 are placed on the bottom surface 35a.

The lower support grid 43 is fixed on the base plate 40. The lower support grid 43 is composed of a plurality of plate members arranged at predetermined intervals with respect to the X direction and the Y direction. The shape of the lower support lattice 43 is a lattice shape.
The lower support grid 43 is arranged in the X direction and the Y direction. The lower support lattice 43 has a plurality of openings having a rectangular column shape into which the lower portion (specifically, the lower end) of the rack cell 53 is inserted. The lower support lattice 43 supports the lower portions of the plurality of rack cells 53 arranged in the horizontal plane direction and extending in the Z direction.

  The middle support lattice 45 has a lattice shape. The middle support lattice 45 is provided so as to support the middle portions in the height direction of the plurality of rack cells 53 supported by the lower support lattice 43. The middle support grid 45 has the same configuration as the lower support grid 43.

The upper support lattice 47 has a lattice shape. The upper support grid 47 has the same configuration as the lower support grid 43 described above. The upper support lattice 47 supports the upper portions of the plurality of rack cells 53 supported by the lower support lattice 43 and the middle support lattice 45.
The above-described support grid member composed of the lower support grid 43, the middle support grid 45, and the upper support grid 47 suppresses the movement or overturn of the plurality of rack cells 53 in the horizontal plane direction.

A plurality of outer peripheral plates 48 are provided so as to cover the side surfaces of the plurality of rack cells 53 exposed from between the outer frame of the lower support lattice 43 and the outer frame of the middle support lattice 45 from four directions.
A plurality of outer peripheral plates 49 are provided so as to cover the side surfaces of the plurality of rack cells 53 exposed from between the outer frame of the middle support lattice 45 and the outer frame of the upper support lattice 47 from four directions.
As described above, since the nuclear fuel storage racks 21 to 29 have the outer peripheral plates 48 and 49, the fluid (water 36) works in the gap between the nuclear fuel storage racks 21 to 29 in the event of an earthquake, and the nuclear fuel storage rack group 20 is attenuated. Therefore, the load acting on the nuclear fuel storage pit 11 can be reduced.

  The plurality of rack cells 53 have a rectangular cylindrical shape. The plurality of rack cells 53 are arranged at predetermined intervals in the X direction and the Y direction. A part of the upper part of the plurality of rack cells 53 protrudes above the upper support lattice 47.

The wall-side rack cell group 55 is composed of a plurality of rack cells 53 arranged on the inner surface 31a side of the wall portion 31 of the nuclear fuel storage pit 11. The nuclear fuel rod 59 is not inserted into the rack cell 53 constituting the wall-side rack cell group 55.
The wall-side rack cell group 55 is disposed within a predetermined range from the inner side surface 31a of the wall portion 31 of the nuclear fuel storage pit 11. The wall-side rack cell group 55 separates the accommodating rack cell group 56 that accommodates the nuclear fuel rods 59 from the inner side surface 31 a of the wall portion 31.

  The accommodating rack cell group 56 includes a plurality of rack cells 53 arranged inside the wall-side rack cell group 55. Nuclear fuel rods 59 are inserted into the plurality of rack cells 53 constituting the accommodating rack cell group 56, respectively.

  Next, the nuclear fuel storage rack 21 will be described. The nuclear fuel storage rack 21 is arranged at a corner formed by the wall 31 and the wall 32 so as to be in contact with the inner side surfaces 31 a and 32 a of the walls 31 and 32.

  The nuclear fuel storage rack 21 is different from the wall-side rack cell group 55 and the accommodating rack cell group 56 that constitute the nuclear fuel storage rack 24 in that the nuclear fuel storage rack 21 includes a wall-side rack cell group 61 and an accommodating rack cell group 62. It is constituted similarly.

The wall-side rack cell group 61 is composed of two rows of rack cells 53 arranged on the inner side surfaces 31a, 32a side of the wall portions 31, 32. The plurality of rack cells 53 constituting the wall-side rack cell group 61 do not contain nuclear fuel rods 59.
The accommodating rack cell group 62 is composed of a plurality of rack cells 53 arranged inside the wall side rack cell group 61. Nuclear fuel rods 59 are accommodated in the plurality of rack cells 53 constituting the accommodating rack cell group 62, respectively.

  Next, the nuclear fuel storage rack 22 will be described. The nuclear fuel storage rack 22 is disposed so as to be in contact with the inner surface 32a of the wall portion 32 and to face the nuclear fuel storage rack 21 in the Y direction.

  The nuclear fuel storage rack 22 is different from the wall-side rack cell group 55 and the accommodating rack cell group 56 that constitute the nuclear fuel storage rack 24 in that the nuclear fuel storage rack 22 includes a wall-side rack cell group 64 and an accommodating rack cell group 65 except for the nuclear fuel storage rack 24. It is constituted similarly.

The wall-side rack cell group 64 includes two rows of rack cells 53 arranged on the inner surface 32a side of the wall portion 32. A plurality of rack cells 53 constituting the wall-side rack cell group 64 do not contain nuclear fuel rods 59.
The accommodating rack cell group 65 includes a plurality of rack cells 53 arranged on the inner side of the wall side rack cell group 64. Nuclear fuel rods 59 are accommodated in each of the plurality of rack cells 53 constituting the accommodating rack cell group 65.

  Next, the nuclear fuel storage rack 23 will be described. The nuclear fuel storage rack 23 is disposed at a corner formed by the wall portion 32 and the wall portion 33 so as to come into contact with the inner side surfaces 32 a and 33 a of the wall portions 32 and 33. The nuclear fuel storage rack 23 faces the nuclear fuel storage rack 22 in the Y direction.

  The nuclear fuel storage rack 23 is different from the wall-side rack cell group 55 and the accommodating rack cell group 56 that constitute the nuclear fuel storage rack 24 in that the nuclear fuel storage rack 23 includes a wall-side rack cell group 66 and an accommodating rack cell group 67. It is constituted similarly.

The wall-side rack cell group 66 is composed of two rows of rack cells 53 arranged on the inner side surfaces 33a, 33a side of the wall portions 32, 33. A plurality of rack cells 53 constituting the wall-side rack cell group 66 do not contain nuclear fuel rods 59.
The accommodating rack cell group 67 is composed of a plurality of rack cells 53 arranged inside the wall side rack cell group 66. Nuclear fuel rods 59 are accommodated in the plurality of rack cells 53 constituting the accommodating rack cell group 67, respectively.

Next, the nuclear fuel storage rack 25 will be described. The nuclear fuel storage rack 25 is disposed at the center of the nuclear fuel storage pit 11. The nuclear fuel storage rack 25 is not in contact with the inner side surfaces 31 a to 34 a of the wall portions 31 to 34.
The nuclear fuel storage rack 25 is disposed between the nuclear fuel storage rack 22 and the nuclear fuel storage rack 28 in the X direction. The nuclear fuel storage rack 25 is disposed between the nuclear fuel storage rack 24 and the nuclear fuel storage rack 26 in the Y direction.

The nuclear fuel storage rack 25 is configured in the same manner as the nuclear fuel storage rack 24 except that the nuclear fuel storage rack 25 includes only the accommodating rack cell group 69 instead of the wall-side rack cell group 55 and the accommodating rack cell group 56 constituting the nuclear fuel storage rack 24. Yes.
All the rack cells 53 constituting the nuclear fuel storage rack 25 constitute a housing rack cell group 69.

  Next, the nuclear fuel storage rack 26 will be described. The nuclear fuel storage rack 26 is arranged to face the nuclear fuel storage rack 25 in the X direction and to face the nuclear fuel storage racks 23 and 29 in the Y direction. The nuclear fuel storage rack 26 is in contact with the inner side surface 33 a of the wall portion 33.

  The nuclear fuel storage rack 26 is different from the wall-side rack cell group 55 and the accommodation rack cell group 56 constituting the nuclear fuel storage rack 24 in that the nuclear fuel storage rack 26 includes the wall-side rack cell group 72 and the accommodation rack cell group 73 except for the nuclear fuel storage rack 24. It is constituted similarly.

The wall-side rack cell group 72 is composed of two rows of rack cells 53 arranged on the inner surface 33 a side of the wall portion 33. The plurality of rack cells 53 constituting the wall-side rack cell group 72 do not contain nuclear fuel rods 59.
The accommodating rack cell group 73 includes a plurality of rack cells 53 arranged on the inner side of the wall side rack cell group 72. Nuclear fuel rods 59 are accommodated in the plurality of rack cells 53 constituting the accommodating rack cell group 73, respectively.

  Next, the nuclear fuel storage rack 27 will be described. The nuclear fuel storage rack 27 is disposed at a corner formed by the wall 31 and the wall 34 so as to come into contact with the inner side surfaces 31 a and 34 a of the walls 31 and 34.

  The nuclear fuel storage rack 27 is different from the wall-side rack cell group 55 and the accommodation rack cell group 56 constituting the nuclear fuel storage rack 24 in that the nuclear fuel storage rack 27 includes the wall-side rack cell group 75 and the accommodation rack cell group 76, It is constituted similarly.

The wall-side rack cell group 75 is composed of two rows of rack cells 53 arranged on the inner side surfaces 31a, 34a side of the wall portions 31, 34. The plurality of rack cells 53 constituting the wall-side rack cell group 75 do not contain nuclear fuel rods 59.
The accommodating rack cell group 76 includes a plurality of rack cells 53 arranged on the inner side of the wall-side rack cell group 75. Nuclear fuel rods 59 are accommodated in the plurality of rack cells 53 constituting the accommodating rack cell group 76, respectively.

  Next, the nuclear fuel storage rack 28 will be described. The nuclear fuel storage rack 28 is in contact with the inner side surface 34a of the wall 34 and is disposed so as to face the nuclear fuel storage rack 25 in the X direction. The nuclear fuel storage rack 28 is disposed between the nuclear fuel storage rack 27 and the nuclear fuel storage rack 29 in the Y direction.

  The nuclear fuel storage rack 28 is different from the wall-side rack cell group 55 and the accommodation rack cell group 56 constituting the nuclear fuel storage rack 24 in that the nuclear fuel storage rack 28 includes a wall-side rack cell group 78 and an accommodation rack cell group 79, It is constituted similarly.

The wall-side rack cell group 78 is composed of two rows of rack cells 53 arranged on the inner side surface 34 a side of the wall portion 34. A plurality of rack cells 53 constituting the wall-side rack cell group 78 do not contain nuclear fuel rods 59.
The accommodating rack cell group 79 is composed of a plurality of rack cells 53 arranged on the inner side of the wall side rack cell group 78. Nuclear fuel rods 59 are accommodated in the plurality of rack cells 53 constituting the accommodating rack cell group 79, respectively.

  Next, the nuclear fuel storage rack 29 will be described. The nuclear fuel storage rack 29 is disposed at a corner formed by the wall 33 and the wall 34 so as to come into contact with the inner surfaces 33a and 34a of the walls 33 and 34. The nuclear fuel storage rack 29 faces the nuclear fuel storage rack 28 in the Y direction. The nuclear fuel storage rack 29 faces the nuclear fuel storage rack 26 in the X direction.

  The nuclear fuel storage rack 29 is different from the wall-side rack cell group 55 and the accommodating rack cell group 56 constituting the nuclear fuel storage rack 24 in that the nuclear fuel storage rack 29 includes a wall-side rack cell group 81 and an accommodating rack cell group 82, It is constituted similarly.

The wall-side rack cell group 81 is composed of two rows of rack cells 53 arranged on the inner side surfaces 33a, 34a side of the wall portions 33, 34. A plurality of rack cells 53 constituting the wall-side rack cell group 81 do not contain nuclear fuel rods 59.
The accommodating rack cell group 82 includes a plurality of rack cells 53 arranged on the inner side of the wall side rack cell group 81. Nuclear fuel rods 59 are accommodated in each of the plurality of rack cells 53 constituting the accommodating rack cell group 82.

  The side surfaces of the nuclear fuel storage rack group 20 including the nuclear fuel storage racks 21 to 29 configured as described above are in contact with the inner side surfaces 31 a to 34 a of the wall portions 31 to 34 of the nuclear fuel storage pit 11.

  According to the nuclear fuel storage racks 21 to 24 and 26 to 29 of the first embodiment configured as described above, the wall portions are arranged on the inner side surfaces 31a to 34a side of the wall portions 31 to 34 of the nuclear fuel storage pit 11. By having the wall side rack cell groups 55, 61, 64, 66, 72, 75, 78, 81 in contact with the inner side surfaces 31a to 34a of 31 to 34, the inner side surfaces 31a to 34a of the wall portions 31 to 34 and the wall side are provided. The side surfaces of the rack cell groups 55, 61, 64, 66, 72, 75, 78, and 81 can be brought into surface contact. Thereby, generation | occurrence | production of the horizontal movement of the nuclear fuel storage racks 21-29 and the rocking | rocking of the nuclear fuel storage racks 21-29 can be suppressed with a simple structure.

  Moreover, it has been used only for the housing rack cell groups 56, 62, 65, 67, 73, 76, 79, 82 arranged inside the wall side rack cell groups 55, 61, 64, 66, 72, 75, 78, 81. The nuclear fuel rod 59 is accommodated, and the nuclear fuel rod 59 is not accommodated in the wall-side rack cell groups 55, 61, 64, 66, 72, 75, 78, 81, so A sufficient distance from the inner side surfaces 31a to 34a of 34 can be secured. Thereby, after ensuring safety, the inner side surfaces 31a to 34a of the wall portions 31 to 34 of the nuclear fuel storage pit 11 and the wall side rack cell groups 55, 61, 64, 66, 72, 75, 78, 81 are connected. Can be contacted.

  In FIG. 1, as an example of the nuclear fuel storage racks 21 to 24 and 26 to 29, a wall-side rack cell group 55, using two rows of rack cells 53 arranged along the inner side surfaces 31 a to 34 a of the wall portions 31 to 34, Although the case where 61, 64, 66, 72, 75, 78, 81 is configured has been described as an example, the rack cell 53 configuring the wall side rack cell group 55, 61, 64, 66, 72, 75, 78, 81 is described. The number of columns may be one or more, and is not limited to this.

The plurality of connecting members 30 are provided so as to connect two nuclear fuel storage racks arranged adjacent to each other among the nuclear fuel storage racks 21 to 29.
Specifically, the connecting member 30 is adjacent to each other between the two upper support lattices 47 disposed adjacent to each other, between the two middle support lattices 45 disposed adjacent to each other, and to each other. Plural (in the case of FIG. 1, two as an example) are provided between the two lower support grids 43 arranged. A plurality of connecting members 30 are arranged in the X direction and the Y direction.

Here, the configuration of the connecting member 30 will be described. The connecting member 30 includes projecting portions 91 and 92 and bolts 93 (or pins).
The protrusion 91 is provided on the upper support lattice 47 of one nuclear fuel storage rack (in the case of FIG. 4, the nuclear fuel storage rack 25) among the two nuclear fuel storage racks 21 to 29 arranged at positions adjacent to each other. . The protrusion 91 protrudes in a direction toward the upper support lattice 47 of the other nuclear fuel storage rack (in the case of FIG. 4, the nuclear fuel storage rack 24).

  The protrusion 91 is provided with a plurality of screw holes 91 </ b> A that penetrate the protrusion 91. The threaded portion of the bolt 93 is screwed into the threaded hole 91A. The protrusion 91 has a flat upper surface 91a.

  Instead of the bolt 93, a pin may be used. In this case, a through hole may be used instead of the screw hole 91A.

The protrusion 92 is provided on the upper support grid 47 of the other nuclear fuel storage rack (the nuclear fuel storage rack 24 in the case of FIG. 4) of the two nuclear fuel storage racks 21 to 29 arranged at positions adjacent to each other. . The protruding portion 92 protrudes in a direction toward the upper support lattice 47 of one nuclear fuel storage rack (in the case of FIG. 4, the nuclear fuel storage rack 25).
The protrusion 92 has a flat lower surface 92a. The protrusion 92 is disposed at a height (in other words, a contactable height) where the lower surface 92 a overlaps the upper surface 91 a of the protrusion 91.

  The protruding portion 92 is provided with a plurality of through holes 92 </ b> A that penetrate the protruding portion 92. The threaded portion of the bolt 93 is inserted into the through hole 92A. The protruding portion 92 is disposed at a position on the protruding portion 91 where the screw hole 91A and the through hole 92A overlap.

  The bolt 93 is screwed into the screw hole 91A. Thereby, the upper part of two nuclear fuel storage racks arrange | positioned in the mutually adjacent position is connected.

  In the first embodiment, as an example, two connection members 30 for connecting the nuclear fuel storage racks arranged in the X direction are provided, and two connections for connecting the nuclear fuel storage racks arranged in the Y direction are provided. Although the case where the member 30 is provided has been described as an example, three or more connecting members 30 may be provided in each of the X direction and the Y direction, or one each in the X direction and the Y direction. Two wide connecting members 30 may be provided.

  As described above, since the nuclear fuel storage racks 21 to 29 are connected by having the connecting members 30 that connect the nuclear fuel storage racks 21 to 29 adjacent to each other, the nuclear fuel storage racks 21 to 29 can be moved apart. It becomes possible to suppress.

  Thus, when slip occurs in the plurality of nuclear fuel storage racks 21 to 29 (nuclear fuel storage rack group 20) due to the occurrence of an earthquake or the like, the side surface of the nuclear fuel storage rack group 20 (in other words, the side surface of the plurality of nuclear fuel storage racks). The inner side surfaces 31a to 34a of the wall portions 31 to 34 are pressed by the interposition. That is, since it becomes possible to suppress that a strong pressure is applied only to a specific region (narrow region) of the inner side surfaces 31a to 34a of the wall portions 31 to 34 of the nuclear fuel storage pit 11, the nuclear fuel storage pit 11 is damaged. Can be suppressed.

  According to the nuclear fuel storage facility 10 of the first embodiment, the nuclear fuel storage pit 11 is disposed on the inner side surfaces 31a to 34a side of the wall portions 31 to 34 of the nuclear fuel storage pit 11, and contacts the inner side surfaces 31a to 34a of the wall portions 31 to 34. By having the wall side rack cell groups 55, 61, 64, 66, 72, 75, 78, 81, the positions of the nuclear fuel storage rack group 20 in the X direction and the Y direction can be regulated by the wall portions 31 to 34. Become. Thereby, generation | occurrence | production of the horizontal movement of the nuclear fuel storage racks 21-29 and the rocking | rocking of the nuclear fuel storage racks 21-29 can be suppressed with a simple structure.

Moreover, it has been used only for the housing rack cell groups 56, 62, 65, 67, 73, 76, 79, 82 arranged inside the wall side rack cell groups 55, 61, 64, 66, 72, 75, 78, 81. By accommodating the nuclear fuel rod 59, a sufficient distance between the nuclear fuel rod 59 and the inner side surfaces 31a to 34a of the wall portions 31 to 34 of the nuclear fuel storage pit 11 can be secured.
Thereby, after ensuring safety, the inner side surfaces 31a to 34a of the wall portions 31 to 34 of the nuclear fuel storage pit 11 and the wall side rack cell groups 55, 61, 64, 66, 72, 75, 78, 81 are connected. Can be contacted.

  In the first embodiment, as an example, the connecting member 30 having the structure shown in FIG. 4 has been described as an example. However, the connecting member 30 can connect the nuclear fuel storage racks 21 to 29 adjacent to each other. Any structure can be used, and the structure is not limited to that shown in FIG.

Moreover, in the nuclear fuel storage facility 10 of 1st Embodiment, although the case where it had the connection member 30 was mentioned as an example and demonstrated as an example, this invention does not go through the connection member 30, and the nuclear fuel storage racks 21-29 It can also be applied to nuclear fuel storage equipment that has a structure that makes direct contact.
In the nuclear fuel storage facility configured as described above, the gap between the nuclear fuel storage racks 21 to 29 arranged adjacent to each other can be made extremely small, so that the earthquake resistance can be improved.

  Further, in the first embodiment, the case where the nuclear fuel storage racks 21 to 29 have a plurality of leg portions 41 has been described as an example. However, instead of the plurality of leg portions 41, a flat plate comes into contact with the bottom surface 35a. A pedestal may be used.

  In the first embodiment, the case where each of the nuclear fuel storage racks 21 to 29 has the outer peripheral plates 48 and 49 has been described as an example. However, instead of this, a plurality of the outer peripheral plates 48 and 49 are not provided. A nuclear fuel storage rack may be used.

(Second Embodiment)
With reference to FIG. 5, the nuclear fuel storage facility 100 of 2nd Embodiment is demonstrated. In FIG. 5, the same components as those of the structure shown in FIG.

In the nuclear fuel storage facility 100 of the second embodiment, the nuclear fuel storage racks 111 to 114 and 116 to 119 are replaced with the nuclear fuel storage racks 21 to 24 and 26 to 29 constituting the nuclear fuel storage facility 10 of the first embodiment. And having the same structure as the nuclear fuel storage facility 10 except that the structures 101 to 106 are further provided.
The nuclear fuel storage racks 25, 111 to 114, and 116 to 119 constitute a nuclear fuel storage rack group 110.

  The structures 101 to 106 are provided in the nuclear fuel storage pit 11. The structure 101 is provided on the inner side surface 32 a of the wall portion 32 corresponding to the arrangement region of the nuclear fuel storage rack 111. The structure 102 is provided on the inner side surface 32 a of the wall portion 32 corresponding to the arrangement region of the nuclear fuel storage rack 112. The structure 103 is provided on the inner side surface 32 a of the wall portion 32 corresponding to the arrangement region of the nuclear fuel storage rack 113.

  The structure 104 is provided on the inner side surface 34 a of the wall portion 34 corresponding to the arrangement region of the nuclear fuel storage rack 117. The structure 105 is provided on the inner side surface 34 a of the wall portion 34 corresponding to the arrangement region of the nuclear fuel storage rack 118. The structure 106 is provided on the inner side surface 34 a of the wall portion 34 corresponding to the arrangement region of the nuclear fuel storage rack 119.

  The nuclear fuel storage rack 111 is configured in the same manner as the nuclear fuel storage rack 21 except that the wall-side rack cell group 61 constituting the nuclear fuel storage rack 21 is provided with a notch 111A that avoids the structure 101. The wall-side rack cell group 61 is disposed at a position separated from the structure 101. A gap is formed between the wall side rack cell group 61 and the structure 101.

  The nuclear fuel storage rack 112 is configured in the same manner as the nuclear fuel storage rack 22 except that the wall-side rack cell group 64 constituting the nuclear fuel storage rack 22 is provided with a notch 112A that avoids the structure 102. Thereby, the wall-side rack cell group 64 is arranged at a position separated from the structure 102. A gap is formed between the wall side rack cell group 64 and the structure 102.

  The nuclear fuel storage rack 113 is configured in the same manner as the nuclear fuel storage rack 23 except that the wall-side rack cell group 66 constituting the nuclear fuel storage rack 23 is provided with a notch 113A that avoids the structure 103. As a result, the wall-side rack cell group 66 is disposed at a position separated from the structure 103. A gap is formed between the wall-side rack cell group 66 and the structure 103.

  The nuclear fuel storage rack 117 is configured in the same manner as the nuclear fuel storage rack 27 except that the wall-side rack cell group 75 constituting the nuclear fuel storage rack 27 is provided with a notch 117A that avoids the structure 104. Thereby, the wall-side rack cell group 75 is arranged at a position separated from the structure 104. A gap is formed between the wall-side rack cell group 75 and the structure 104.

  The nuclear fuel storage rack 118 is configured in the same manner as the nuclear fuel storage rack 28 except that the wall-side rack cell group 78 constituting the nuclear fuel storage rack 28 is provided with a notch 118A that avoids the structure 105. Thereby, the wall-side rack cell group 78 is disposed at a position separated from the structure 105. A gap is formed between the wall-side rack cell group 78 and the structure 105.

  The nuclear fuel storage rack 119 is configured in the same manner as the nuclear fuel storage rack 29 except that the wall-side rack cell group 81 constituting the nuclear fuel storage rack 29 is provided with a notch 119A that avoids the structure 106. As a result, the wall-side rack cell group 81 is disposed at a position separated from the structure 106. A gap is formed between the wall-side rack cell group 81 and the structure 106.

According to the nuclear fuel storage facility 100 of the second embodiment, the wall-side rack cell group 55, 61, 64, 66, 72, 75, 78, 81 has the notches 111A to 113A and 117A to 119A. Even when the structures 101 to 106 are provided on the inner surfaces 31a to 34a of the portions 31 to 34, the structures 101 to 106 are avoided, and the wall side rack cell groups 55, 61, 64, 66, 72, 75, 78, The side surface of 81 and the inner side surfaces 31a to 34a of the wall portions 31 to 34 can be brought into contact with each other.
In addition, the nuclear fuel storage facility 100 of 2nd Embodiment can acquire the effect similar to the nuclear fuel storage facility 10 of 1st Embodiment.

(Third embodiment)
With reference to FIG. 6, the nuclear fuel storage facility 125 of 3rd Embodiment is demonstrated. In FIG. 5, the same components as those of the structure shown in FIG. In the third embodiment, a disc spring 127 will be described as an example of an elastic body.

  The nuclear fuel storage facility 125 of the third embodiment is configured in the same manner as the nuclear fuel storage facility 10 except that the configuration of the nuclear fuel storage facility 10 of the first embodiment further includes a plurality of disc springs 127.

  A plurality of disc springs 127 are arranged between the nuclear fuel storage racks 21 to 29 adjacent to each other. The disc springs 127 are arranged in the X direction and the Y direction.

  According to the nuclear fuel storage facility 125 of the third embodiment, the wall portions 31 to 34 of the nuclear fuel storage pit 11 are provided by having a plurality of disc springs 127 arranged between the adjacent nuclear fuel storage racks 21 to 29. It becomes possible to maintain the state where the side surfaces of the wall side rack cell groups 55, 61, 64, 66, 72, 75, 78, 81 are pressed against the inner side surfaces 31a to 34a.

As a result, a gap is formed between the inner side surfaces 31a to 34a of the wall portions 31 to 34 of the nuclear fuel storage pit 11 and the wall side rack cell groups 55, 61, 64, 66, 72, 75, 78, 81. Can be suppressed.
In particular, when the nuclear fuel storage racks 21 to 29 have thermal elongation, the plurality of disc springs 127 can absorb the thermal elongation, which is effective.

  In addition, the disc spring 127 can be easily disposed in a narrow space and can be easily exchanged, so that the maintainability can be improved.

  In the third embodiment, the disc spring 127 is described as an example of the elastic body. However, another elastic body may be used instead of the disc spring 127. Examples of other elastic bodies include rubbers, leaf springs, coil springs, and the like.

  In the third embodiment, the case where a plurality of disc springs 127 are used has been described as an example, but a plurality of spacers may be used instead of the plurality of disc springs 127. In the case where a plurality of spacers are used, the plurality of spacers may be arranged after the nuclear fuel storage racks 21 to 29 are thermally stretched. In this case, the same effect as the nuclear fuel storage facility 125 of the third embodiment can be obtained.

(Fourth embodiment)
A nuclear fuel storage rack 130 according to the fourth embodiment will be described with reference to FIG. In FIG. 7, the same components as those in the structure shown in FIG.

  In the nuclear fuel storage rack 130 of the fourth embodiment, the wall-side rack cell group 61 and the housing rack cell group 62 constituting the nuclear fuel storage rack 21 described in the first embodiment are separated, and On the other hand, it has the same configuration as the nuclear fuel storage rack 21 except that it has a plurality of detachable members 131 for detaching the wall-side rack cell group 61.

A plurality of detachable members 131 are provided between the wall-side rack cell group 61 and the accommodating rack cell group 62. A plurality of detachable members 131 are arranged in the X direction and the Y direction (two in the case of FIG. 7 as an example).
As the detachable member 131, for example, a member having the same structure as that of the connecting member 30 shown in FIG. 4 can be used, but it is not limited to this. As the detachable member 131, for example, a member having an insertion structure may be used.

(Fifth embodiment)
With reference to FIG. 8, the nuclear fuel storage facility 140 of 5th Embodiment is demonstrated. In FIG. 8, the same components as those in the structure shown in FIG.

  In the nuclear fuel storage facility 140 of the fifth embodiment, instead of the nuclear fuel storage racks 21 to 24 and 26 to 29 constituting the nuclear fuel storage facility 10 of the first embodiment, nuclear fuel storage racks 141 to 144 and 146 to 149 are replaced. In addition, it has the same configuration as the nuclear fuel storage facility 10 except that it further includes a plurality of radiation shielding members 150.

  The nuclear fuel storage rack 141 is different from the wall-side rack cell group 61 and the accommodating rack cell group 62 constituting the nuclear fuel storage rack 21 except that the nuclear fuel storage rack 141 includes a wall-side rack cell group 151 and an accommodating rack cell group 152. It is constituted similarly.

  The wall-side rack cell group 151 includes a row of rack cells 53 arranged along the inner side surfaces 31 a and 32 a of the wall portions 31 and 32. The side surfaces of the wall-side rack cell group 151 are in contact with the inner side surfaces 31 a and 32 a of the wall portions 31 and 32.

  The accommodating rack cell group 152 includes a plurality of rack cells 53 arranged inside the wall-side rack cell group 151. The accommodating rack cell group 152 is disposed at a position closer to the walls 31 and 32 than the accommodating rack cell group 62. Nuclear fuel rods 59 are accommodated in each of the plurality of rack cells 53 constituting the accommodating rack cell group 152.

  The nuclear fuel storage rack 142 is different from the wall-side rack cell group 64 and the accommodation rack cell group 65 that constitute the nuclear fuel storage rack 22 in that the nuclear fuel storage rack 142 includes the wall-side rack cell group 153 and the accommodation rack cell group 154 except that It is constituted similarly.

  The wall-side rack cell group 153 includes a row of rack cells 53 arranged along the inner surface 32 a of the wall portion 32. The side surface of the wall side rack cell group 153 is in contact with the inner side surface 32 a of the wall portion 32.

  The accommodating rack cell group 154 includes a plurality of rack cells 53 arranged inside the wall side rack cell group 153. The accommodating rack cell group 154 is disposed at a position closer to the wall portion 32 than the accommodating rack cell group 65. Nuclear fuel rods 59 are accommodated in the plurality of rack cells 53 constituting the accommodating rack cell group 154, respectively.

  The nuclear fuel storage rack 143 is different from the wall-side rack cell group 66 and the housing rack cell group 67 constituting the nuclear fuel storage rack 23 in that the nuclear fuel storage rack 143 includes the wall-side rack cell group 155 and the housing rack cell group 156 except for the nuclear fuel storage rack 23. It is constituted similarly.

  The wall-side rack cell group 155 includes a row of rack cells 53 arranged along the inner side surfaces 32 a and 33 a of the wall portions 32 and 33. The side surfaces of the wall-side rack cell group 155 are in contact with the inner side surfaces 32 a and 33 a of the wall portions 32 and 33.

  The accommodating rack cell group 156 includes a plurality of rack cells 53 disposed inside the wall side rack cell group 155. The accommodating rack cell group 156 is disposed at a position closer to the walls 32 and 33 than the accommodating rack cell group 67. Nuclear fuel rods 59 are accommodated in each of the plurality of rack cells 53 constituting the accommodating rack cell group 156.

  The nuclear fuel storage rack 144 is different from the wall-side rack cell group 55 and the accommodation rack cell group 56 constituting the nuclear fuel storage rack 24 in that the nuclear fuel storage rack 144 includes the wall-side rack cell group 158 and the accommodation rack cell group 159 except that It is constituted similarly.

  The wall-side rack cell group 158 includes a row of rack cells 53 arranged along the inner surface 31 a of the wall portion 31. The side surface of the wall side rack cell group 158 is in contact with the inner side surface 31 a of the wall portion 31.

  The accommodating rack cell group 159 includes a plurality of rack cells 53 arranged inside the wall side rack cell group 158. The accommodating rack cell group 159 is disposed closer to the wall portion 31 than the accommodating rack cell group 56. Nuclear fuel rods 59 are accommodated in the plurality of rack cells 53 constituting the accommodating rack cell group 159, respectively.

  The nuclear fuel storage rack 146 is different from the wall-side rack cell group 72 and the accommodating rack cell group 73 constituting the nuclear fuel storage rack 26 in that the nuclear fuel storage rack 146 includes the wall-side rack cell group 161 and the accommodating rack cell group 162 except for the It is constituted similarly.

  The wall-side rack cell group 161 is composed of one row of rack cells 53 arranged along the inner side surface 33 a of the wall portion 33. The side surface of the wall side rack cell group 161 is in contact with the inner side surface 33 a of the wall portion 33.

  The accommodating rack cell group 162 includes a plurality of rack cells 53 arranged inside the wall-side rack cell group 161. The accommodating rack cell group 162 is disposed closer to the wall 33 than the accommodating rack cell group 73. Nuclear fuel rods 59 are accommodated in the plurality of rack cells 53 constituting the accommodating rack cell group 162, respectively.

  The nuclear fuel storage rack 147 is different from the wall-side rack cell group 75 and the housing rack cell group 76 constituting the nuclear fuel storage rack 27 in that the nuclear fuel storage rack 147 includes the wall-side rack cell group 163 and the housing rack cell group 164 except that It is constituted similarly.

  The wall-side rack cell group 163 includes a row of rack cells 53 arranged along the inner side surfaces 31 a and 34 a of the wall portions 31 and 34. The side surfaces of the wall side rack cell group 163 are in contact with the inner side surfaces 31 a and 34 a of the wall portions 31 and 34.

  The accommodating rack cell group 164 includes a plurality of rack cells 53 arranged inside the wall side rack cell group 163. The accommodating rack cell group 164 is disposed at a position closer to the wall portions 31 and 34 than the accommodating rack cell group 76. Nuclear fuel rods 59 are accommodated in the plurality of rack cells 53 constituting the accommodating rack cell group 164, respectively.

  The nuclear fuel storage rack 148 is different from the wall-side rack cell group 78 and the housing rack cell group 79 constituting the nuclear fuel storage rack 28 except that it includes a wall-side rack cell group 165 and a housing rack cell group 166. It is constituted similarly.

  The wall-side rack cell group 165 is composed of one row of rack cells 53 arranged along the inner side surface 34 a of the wall portion 34. The side surface of the wall side rack cell group 165 is in contact with the inner side surface 34 a of the wall portion 34.

  The accommodating rack cell group 166 includes a plurality of rack cells 53 disposed inside the wall side rack cell group 165. The accommodating rack cell group 166 is disposed closer to the wall portion 34 than the accommodating rack cell group 79. Nuclear fuel rods 59 are accommodated in the plurality of rack cells 53 constituting the accommodating rack cell group 166, respectively.

  The nuclear fuel storage rack 149 is different from the wall-side rack cell group 81 and the accommodating rack cell group 82 constituting the nuclear fuel storage rack 29 in that the nuclear fuel storage rack 149 includes the wall-side rack cell group 167 and the accommodating rack cell group 168. It is constituted similarly.

  The wall-side rack cell group 167 includes a row of rack cells 53 arranged along the inner side surfaces 33a, 34a of the wall portions 33, 34. The side surfaces of the wall-side rack cell group 167 are in contact with the inner side surfaces 33 a and 34 a of the wall portions 33 and 34.

  The accommodating rack cell group 168 includes a plurality of rack cells 53 arranged inside the wall side rack cell group 167. The accommodating rack cell group 168 is disposed at a position closer to the wall portions 33 and 34 than the accommodating rack cell group 82. Nuclear fuel rods 59 are accommodated in the plurality of rack cells 53 constituting the accommodating rack cell group 168, respectively.

  The nuclear fuel storage racks 25, 141 to 144 and 146 to 149 configured as described above are connected by a plurality of connecting members 30 arranged in the X direction and the Y direction.

The radiation shielding member 150 is accommodated in each rack cell 53 constituting the wall side rack cell group 151, 153, 155, 158, 161, 163, 165, 167.
The radiation shielding member 150 has a function of shielding radiation emitted from the nuclear fuel rod 59. As the radiation shielding member 150, for example, a rod-shaped member made of a material that shields radiation can be used. As the radiation shielding member 150, for example, a metal material such as lead can be used.

  According to the nuclear fuel storage facility 140 of the fifth embodiment, the radiation shielding member 150 is disposed in the plurality of rack cells 53 constituting the wall side rack cell groups 151, 153, 155, 158, 161, 163, 165, 167. This makes it possible to shield radiation emitted from the nuclear fuel rod 59 (used nuclear fuel).

Thus, the wall side rack cells arranged in the direction toward the inner side surfaces 31a to 34a of the wall portions 31 to 34 of the nuclear fuel storage pit 11 or the accommodating rack cell groups 152, 154, 156, 159, 162, 164, 166, 168. It becomes possible to reduce the number of rack cells 53 constituting the groups 151, 153, 155, 158, 161, 163, 165, 167.
That is, it is possible to increase the number of rack cells 53 constituting the accommodating rack cell groups 152, 154, 156, 159, 162, 164, 166, 168. As a result, the number of spent nuclear fuel rods 59 that can be accommodated in the accommodating rack cell groups 152, 154, 156, 159, 162, 164, 166, and 168 can be increased.

  The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to such specific embodiments, and within the scope of the present invention described in the claims, Various modifications and changes are possible.

  In the nuclear fuel storage facilities 10, 100, 125, and 140 of the first to third embodiments and the fifth embodiment, as an example, the nuclear fuel storage rack group 20 is configured by nine connected nuclear fuel storage racks. Although the case has been described as an example, the number of nuclear fuel storage racks constituting the nuclear fuel storage rack group 20 can be appropriately set according to the size of the nuclear fuel storage rack and the size of the nuclear fuel storage pit 11. And is not limited to nine.

10, 100, 125, 140 ... Nuclear fuel storage facilities, 11 ... Nuclear fuel storage pits, 20, 110 ... Nuclear fuel storage racks, 21-29, 111-114, 116-119, 130, 141-144, 146-149 ... Nuclear fuel storage rack, 30 ... connecting member, 31-34 ... wall, 31a-34a ... inner surface, 35 ... bottom, 35a ... bottom, 36 ... water, 40 ... base plate, 41 ... leg, 43 ... lower support grid, 45 ... middle support lattice, 47 ... upper support lattice, 48, 49 ... outer peripheral plate, 53 ... rack cell, 55, 61, 64, 66, 72, 75, 78, 81, 151, 153, 155, 158, 161, 163 , 165, 167... Wall side rack cell group, 56, 62, 65, 67, 69, 73, 76, 79, 82, 152, 154, 156, 159, 162, 164 66,168 ... accommodating Rakkuseru group, 59 ... nuclear fuel rods,
91, 92 ... Projection, 93 ... Bolt, 91A ... Screw hole, 91a ... Upper surface, 92a ... Lower surface, 92A ... Through hole, 101-106 ... Structure, 111A-113A, 117A-119A ... Notch, 127 ... Belleville spring 131 ... Detachable member 150 ... Radiation shielding member

Claims (8)

A nuclear fuel storage pit with water stored inside;
A nuclear fuel storage rack in which a plurality of rack cells arranged in water in the nuclear fuel storage pit and having an inner space extending in the vertical direction are arranged in a lattice pattern;
With
The nuclear fuel storage rack is disposed inside a wall side rack cell group composed of rack cells disposed on an inner surface side of a wall portion of the nuclear fuel storage pit among the plurality of rack cells, and the wall side rack cell group. A rack cell group for storage composed of rack cells,
The wall side rack cell group is in contact with the inner side surface of the wall portion of the nuclear fuel storage pit,
A nuclear fuel storage facility further comprising spent nuclear fuel accommodated only in the rack cells of the accommodating rack cell group out of the wall-side rack cell group and the accommodating rack cell group. A plurality of the nuclear fuel storage racks are provided,
The nuclear fuel storage facility according to claim 1, further comprising a connecting member that connects the nuclear fuel storage racks adjacent to each other. A plurality of wall portions of the nuclear fuel storage pit are provided,
The nuclear fuel storage facility according to claim 2, wherein inner surfaces of the plurality of wall portions are in contact with any one of the plurality of nuclear fuel storage racks.   The nuclear fuel storage facility according to any one of claims 1 to 3, further comprising a radiation shielding member that is disposed in the rack cells constituting the wall-side rack cell group and shields radiation emitted from the spent nuclear fuel.   The nuclear fuel storage facility according to any one of claims 1 to 4, wherein the wall-side rack cell group includes a cutout portion provided on an inner surface side of the wall portion.   The nuclear fuel storage facility according to any one of claims 2 to 4, further comprising a spacer disposed between adjacent nuclear fuel storage racks among the nuclear fuel storage racks.   The nuclear fuel storage facility according to any one of claims 2 to 6, further comprising an elastic body sandwiched between adjacent nuclear fuel storage racks among the nuclear fuel storage racks.   The nuclear fuel storage facility according to any one of claims 1 to 7, wherein the wall-side rack cell group is configured to be detachable from the housing rack cell group.

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