JP2014145788A - Nuclear fuel storage rack and nuclear fuel storage rack group - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nuclear fuel storage rack capable of preventing the rack body of a nuclear fuel storage rack from colliding against a side wall of other nuclear fuel storage rack or a storage pit adjacent to the nuclear fuel storage rack, even if it is to be slidable on the bottom surface of the storage pit, and a nuclear fuel storage rack group.SOLUTION: A nuclear fuel storage rack M that is aligned and stored in a storage pit 3 while housing nuclear fuel assemblies comprises: rectangular parallelepiped rack bodies 6 for housing the nuclear fuel assemblies; support leg parts 5 for supporting the rack bodies 6 so that they are slidable on the bottom surface 3b of the storage pit 3; and colliding members 15 disposed on both ends of sides 7 of the rack bodies 6 and protruding from the sides 7. The colliding members 15 include: a plurality of convex colliding parts 15A protruding from the sides 7; and concave support parts 15B that are placed between the colliding parts 15A adjacent to each other to connect the colliding parts 15A and that come into contact with the sides 7 to support the colliding parts 15A.

Description

  The present invention relates to a nuclear fuel storage rack and a nuclear fuel storage rack group that are stored in an aligned arrangement in a storage pit in a state in which a nuclear fuel assembly is housed.

  For example, spent nuclear fuel (used nuclear fuel rods) generated at a nuclear power plant is stored and stored in a nuclear fuel storage facility. Further, as shown in FIG. 30, the spent nuclear fuel is accommodated in a vertical cell (rack cell) 1 of a nuclear fuel storage rack A in a state of being accommodated in a square tube as a nuclear fuel assembly, and a storage pit 3 of a nuclear fuel storage facility 2 is stored. Stored within. Water is stored in the storage pit 3, and a plurality of nuclear fuel storage racks A are arranged and stored in the water, so that the decay heat is cooled and kept below the criticality, and radiation is shielded. Like to do.

  Conventionally, the nuclear fuel storage rack A is installed in a state of being fixed to a side wall 3a and a bottom plate (bottom surface) 3b of a storage pit 3 with a support (anchor) (for example, see Patent Document 1). As described above, when the nuclear fuel storage rack A is fixed to the storage pit 3, it is possible to obtain a seismic isolation effect to some extent by the water fluid addition attenuation effect at the time of the earthquake occurrence, but the support load becomes large at the time of a large earthquake. As a result, the nuclear fuel storage rack A may not be supported.

  For this reason, a technique for storing the nuclear fuel storage rack A without fixing it to the side wall 3a or the bottom panel 3b of the storage pit 3 has been proposed and put into practical use. In this method, the nuclear fuel storage rack A is slidably mounted on the bottom surface 3b of the storage pit 3 (is slidably mounted by providing a sliding mechanism), and acts when an earthquake occurs. This is a so-called free-standing rack that absorbs the horizontal force by sliding (sliding) the nuclear fuel storage rack A together with the fluid-added damping effect of water.

  Thus, when the nuclear fuel storage rack A is configured to slide during an earthquake (that is, when the nuclear fuel storage rack A is configured as a self-supporting rack), the nuclear fuel storage rack A is, for example, FIG. 31 or FIG. 32, the base plate 4, the four support legs 5 projecting downward with the upper ends thereof connected to the four corner portions of the base plate 4, and the plurality of vertical cells 1 provided above the base plate 4 are provided. And a cell storage portion (rack main body) 6 that accommodates and holds the battery. The cell storage unit 6 is formed by assembling a column 6a, a cross member 6b, and an oblique member (stay) 6c as shown in FIG. 31, or surrounded by the column 6a and the cross member 6b as shown in FIG. It is formed by providing an outer peripheral plate 6d in the surface.

Japanese Patent Laid-Open No. 62-190494

  However, as described above, when the nuclear fuel storage rack A is configured to be slidable with respect to the bottom surface 3b of the storage pit 3, when a large earthquake occurs, the nuclear fuel storage rack A generates the horizontal force generated by the earthquake. However, the direction of movement is not fixed (for example, linear movement / rotational movement in the horizontal direction, rocking (fluctuation) due to overturning moment caused by horizontal force, etc.). As shown in FIG. 33, when the movement direction of the nuclear fuel storage rack A is not determined in this way, the rack main bodies 6 (vertical cells 1) of the adjacent nuclear fuel storage racks A collide with each other, There is a possibility that the side wall 3a of the storage pit 3 may collide. It is not preferable that the rack body 6 is impacted by such a collision and is damaged or deformed.

  The present invention has been made in view of such circumstances, and even if the nuclear fuel storage rack is slidable with respect to the bottom surface of the storage pit, the rack bodies of the nuclear fuel storage racks are adjacent to each other. It is an object of the present invention to provide a nuclear fuel storage rack and a nuclear fuel storage rack group that can prevent collision with other nuclear fuel storage racks and the side walls of storage pits.

In order to achieve the above object, the present invention proposes the following means.
That is, the present invention relates to a nuclear fuel storage rack that is stored in an aligned arrangement in a storage pit in a state in which the nuclear fuel assembly is stored, and a rectangular parallelepiped rack body that stores the nuclear fuel assembly; A support leg that supports the rack body slidably with respect to the bottom surface, and a collision member that is disposed on the left and right edges of the side surface of the rack body and protrudes from the side surface. A plurality of convex collision parts projecting from the side surface and a concave support part which is located between the adjacent collision parts and connects the collision parts, and abuts against the side surface to support the collision part. And.

  The nuclear fuel storage rack according to the present invention is a so-called free type in which the support leg portion that supports the rack body is slidable with respect to the bottom surface of the storage pit, so that it can move relative to the bottom surface. It is a standing rack. In this case, when a large earthquake occurs, the nuclear fuel storage rack moves so as to slide (slide) with respect to the bottom surface, and can absorb the horizontal force caused by the earthquake. Becomes undefined (for example, horizontal straight line, rotational movement, rocking, etc.). According to the nuclear fuel storage rack of the present invention, since the collision members are provided to project from the left and right edges of the side surface of the rack body, the movement direction of the nuclear fuel storage rack is not determined as described above. In addition, the collision member disposed between the adjacent nuclear fuel storage racks (or the nuclear fuel storage rack and the side wall of the storage pit) prevents direct collision between the rack main bodies (or the rack main body and the side wall). .

  Specifically, not only when the nuclear fuel storage rack moves linearly in the horizontal direction with respect to the bottom surface, but also when the nuclear fuel storage rack rotates, the collision member of the nuclear fuel storage rack is not It will collide with the side wall of the nuclear fuel storage rack or storage pit, and the rack body of the nuclear fuel storage rack is prevented from colliding. Even when the nuclear fuel storage rack is locked, the collision member of the nuclear fuel storage rack collides with another adjacent nuclear fuel storage rack or the side wall of the storage pit.

Thus, since the collision location in the nuclear fuel storage rack is specified as the collision member, the collision of the rack body of the nuclear fuel storage rack is surely prevented. Therefore, the impact on the rack main body and the nuclear fuel assembly housed in the rack main body is sufficiently mitigated to protect them.
In addition, the collision member includes a convex collision portion that protrudes from the side surface of the rack body. Thus, since the collision part protrudes and is formed, the collision member receives the impact of the collision from the collision part with certainty. And an impact is reliably absorbed because an impact part elastically deforms.
Specifically, the collision member is located between the plurality of convex collision parts projecting from the side surface and the collision parts adjacent to each other and connects the collision parts, and is in contact with the side surface to cause the collision. The following effects can be obtained.
That is, according to the nuclear fuel storage rack according to the present invention, the collision member is formed in a corrugated plate shape, for example. And while receiving impacts of collision in a wide range from a plurality of collision parts protruding from the side surface of the rack body, these collision parts are elastically deformed, and the support parts supporting these collision parts are elastically deformed, Make sure to reduce the impact.

  In the nuclear fuel storage rack according to the present invention, the collision member may be configured to be capable of absorbing shock by being deformed in accordance with the collision.

  According to the nuclear fuel storage rack according to the present invention, the collision member is configured to be able to absorb an impact while being deformed in accordance with the collision. Therefore, when the collision member receives an impact due to the above-described collision, the impact is less likely to be transmitted to the rack body.

  In the nuclear fuel storage rack according to the present invention, the collision member may be configured to absorb an impact by plastic deformation.

  According to the nuclear fuel storage rack according to the present invention, the collision member can have a simple structure using, for example, a metal plate that is easily plastically deformed. In this case, the cost for producing the collision member is reduced. Further, the performance (impact absorbing ability) of the collision member can be easily confirmed by visual observation.

  In the nuclear fuel storage rack according to the present invention, the collision member may be detachably disposed on the side surface.

  According to the nuclear fuel storage rack according to the present invention, even if the collision member is plastically deformed and crushed by absorbing the impact, it can be replaced with a new collision member. Therefore, even if an earthquake or the like repeatedly occurs, the above-described effect can be repeatedly obtained by replacing the plastically deformed collision member with a new one.

  In the nuclear fuel storage rack according to the present invention, the pair of collision members disposed on the left and right edge portions of the side surface may be set to have different rigidity.

  According to the nuclear fuel storage rack according to the present invention, the pair of collision members disposed at the left and right edge portions of the side surface of the rack body are set to have different rigidity. In this case, the nuclear fuel storage racks adjacent to each other make the side surfaces face each other, and the collision member having high rigidity and the collision member having low rigidity face each other. Therefore, when an earthquake occurs, collision members having different rigidity collide with each other, and the collision member with low rigidity is surely plastically deformed. Thereby, the impact absorption effect by a collision member is acquired reliably.

  In the nuclear fuel storage rack according to the present invention, the collision member may be configured to absorb an impact by elastic deformation.

  According to the nuclear fuel storage rack of the present invention, the collision member is configured using, for example, a leaf spring. Since this collision member is elastically deformed, even if it is deformed by the impact of a collision, the shape is restored, and the impact can be relieved repeatedly. Therefore, even if the earthquake repeatedly occurs, the above-described effects can be stably achieved.

  Further, in the nuclear fuel storage rack according to the present invention, it is inserted between the side surface and the collision part, and is disposed on the adjacent nuclear fuel storage rack, and a locking part that can contact the collision part. It is good also as providing the connection part which connects the said latching | locking parts.

  In this case, since the locking portions respectively arranged in the adjacent nuclear fuel storage racks are connected by the connecting portion, when the nuclear fuel storage racks move relative to each other in a direction away from each other, the locking portion Abuts against the collision part from the side surface side, and the nuclear fuel storage racks are prevented from being further separated from each other. Thereby, even if these nuclear fuel storage racks approach each other again and the collision part collides, the impact is suppressed. Further, when attention is paid to the impact when the locking portion comes into contact with the collision portion, the impact portion can be elastically deformed. Therefore, the impact at the time of contact is also reduced.

  In the nuclear fuel storage rack according to the present invention, the collision member may be bonded to any one of the collision member and the side surface of another adjacent nuclear fuel storage rack.

  According to the nuclear fuel storage rack according to the present invention, since the collision member is bonded to either the collision member of the other adjacent nuclear fuel storage rack or the side surface, these nuclear fuel storage racks are connected to each other side surface. It is united through a collision member located between them. In this case, the arrangement interval between the nuclear fuel storage racks is narrowed, and these nuclear fuel storage racks are arranged so as to be spread in the storage pit. Thereby, when the earthquake occurs, the magnitude of the amplitude at which the nuclear fuel storage rack swings is suppressed, so that the collision load of the collision member is reduced.

  Further, in this case, the adjacent nuclear fuel storage racks integrated by the collision member being bonded are also prevented from shaking in a direction away from each other. Therefore, for example, even if a relatively large space is provided on the side of the nuclear fuel storage rack, the nuclear fuel storage rack is prevented from falling toward the space.

  Further, in the nuclear fuel storage rack according to the present invention, the nuclear fuel storage rack located on the outermost side among the aligned nuclear fuel storage racks is disposed on a side surface of the side surface facing the side wall of the storage pit. The collision member may be disposed close to the side wall, and a predetermined gap may be provided between the collision member and the side wall in anticipation of thermal expansion of the nuclear fuel storage rack.

  According to the nuclear fuel storage rack of the present invention, the collision member facing the side wall side of the storage pit in the outermost nuclear fuel storage rack among the aligned nuclear fuel storage racks approaches the side wall. Has been placed. As a result, when an earthquake occurs, the collision member comes into contact with the side wall and the nuclear fuel storage rack is reliably prevented from falling toward the side wall.

  A gap (predetermined gap) is set between the collision member and the side wall in anticipation of thermal expansion of a plurality of aligned nuclear fuel storage racks. As a result, even if the nuclear fuel storage racks are arranged so as to be laid, the thermal expansion of these nuclear fuel storage racks can be absorbed by the gap. Therefore, thermal stress does not occur in the nuclear fuel storage rack due to such thermal expansion. Further, the provision of the gap does not hinder the operation of installing the nuclear fuel storage rack in the storage pit.

  Further, in the nuclear fuel storage rack according to the present invention, the aligned nuclear fuel storage racks are accommodated so as to be close to each other and close to the region surrounded by the side wall of the storage pit, and are positioned on the outermost side. In the nuclear fuel storage rack, the collision member disposed on the side surface of the side surface facing the side wall of the storage pit may be disposed close to the side wall.

  According to the nuclear fuel storage rack according to the present invention, the nuclear fuel storage rack can be reliably prevented from falling when an earthquake occurs.

  Further, in the nuclear fuel storage rack according to the present invention, the support leg portions are arranged at four corners on the lower surface of the rack body, and a distance between the pair of support leg portions adjacent to each other in the lateral direction of the side surface is as follows. The rack body may be set to prevent the rack body from falling.

  According to the nuclear fuel storage rack according to the present invention, the nuclear fuel storage rack is prevented from being locked when an earthquake occurs or transported, and the fall is prevented.

  Moreover, in the nuclear fuel storage rack according to the present invention, the outer shape may be set so as to be accommodated in a container for land transportation.

  According to the nuclear fuel storage rack according to the present invention, it is possible to transport to the inland part, and the transportation cost is greatly reduced.

  The present invention also relates to a nuclear fuel storage rack group in which nuclear fuel storage racks stored in storage pits in a state where the nuclear fuel assemblies are housed are aligned, wherein the nuclear fuel storage rack is the nuclear fuel assembly. A rectangular parallelepiped rack main body, a support leg that supports the rack main body slidably with respect to the bottom surface of the storage pit, and a left and right edge portion on the side of the rack main body, A collision member protruding from the side surface, and the collision member is located between the plurality of convex collision portions protruding from the side surface and the adjacent collision portions and connects the collision portions. A concave support portion that abuts against the side surface and supports the collision portion, and of the adjacent nuclear fuel storage racks, the collision member of one nuclear fuel storage rack is the other nuclear fuel storage rack. Characterized in that said disposed to face the side surface.

  According to the nuclear fuel storage rack group according to the present invention, the nuclear fuel storage rack has a collision member projecting from one of the left and right edges of the side surface of the rack body. The collision member is disposed to face the side surface of another nuclear fuel storage rack (the other nuclear fuel storage rack) adjacent to the nuclear fuel storage rack (one nuclear fuel storage rack). According to such a configuration, even when the movement direction of the nuclear fuel storage rack is not determined when a large earthquake occurs, the collision member disposed between the adjacent nuclear fuel storage racks is Prevent direct collision between each other.

  That is, since the adjacent nuclear fuel storage racks collide with each other via the collision member, the impact of these nuclear fuel storage racks on the rack body is reliably mitigated, and stored in the rack body and the rack body. Protected nuclear fuel assemblies.

  Further, in this case, the interval between the facing side surfaces of the adjacent nuclear fuel storage racks can be set to be relatively small, and the nuclear fuel storage racks can be arranged so as to be closely packed. Therefore, the space in the storage pit can be used effectively.

  According to the nuclear fuel storage rack and the nuclear fuel storage rack group according to the present invention, even if the nuclear fuel storage rack is slidable with respect to the bottom surface of the storage pit, the rack main bodies of the nuclear fuel storage racks are adjacent to each other. It is possible to prevent collision with other nuclear fuel storage racks or side walls of storage pits.

It is a side view which shows the nuclear fuel storage rack which concerns on the 1st reference example of this invention. FIG. 2 is a top view showing the nuclear fuel storage rack of FIG. 1. It is a side view which shows the rack (group) for nuclear fuel storage which concerns on the 2nd reference example of this invention. FIG. 4 is a top view showing the nuclear fuel storage rack (group) of FIG. 3. It is a top view which shows the rack for nuclear fuel storage which concerns on the 3rd reference example of this invention. It is a partial top view which shows the modification of the principal part of the nuclear fuel storage rack which concerns on a 3rd reference example. It is a partial top view which shows the modification of the principal part of the nuclear fuel storage rack which concerns on a 3rd reference example. It is a partial top view which shows the principal part of the rack for nuclear fuel storage which concerns on the 4th reference example of this invention. It is a partial top view which shows the modification of the principal part of the nuclear fuel storage rack which concerns on a 4th reference example. It is a partial top view which shows the modification of the principal part of the nuclear fuel storage rack which concerns on a 4th reference example. It is a partial side view which shows the principal part of FIG. It is a top view which shows the rack group for nuclear fuel storage formed by arranging the nuclear fuel storage rack of FIG. 10 in alignment. It is a top view which shows the rack (group) for nuclear fuel storage which concerns on the 5th reference example of this invention. It is a top view which shows the rack (group) for nuclear fuel storage which concerns on the 5th reference example of this invention. It is a top view which shows the rack for nuclear fuel storage which concerns on the 6th reference example of this invention. It is a side view which shows the rack for nuclear fuel storage which concerns on the 7th reference example of this invention. It is a side view which shows the rack (group) for nuclear fuel storage which concerns on the 8th reference example of this invention. It is a top view which shows the rack (group) for nuclear fuel storage of FIG. It is a side view which shows the modification of the rack (group) for nuclear fuel storage which concerns on an 8th reference example. FIG. 20A is a diagram showing a main part of the nuclear fuel storage rack of FIG. 19, and FIG. 20B is a diagram showing a modification of the main part. FIG. 20A is a diagram showing a modification of the main part of the nuclear fuel storage rack of FIG. 19, and FIG. 20B is a diagram showing a modification of the main part. It is a top view which shows the modification of the rack (group) for nuclear fuel storage which concerns on an 8th reference example. It is a side view which shows the rack (group) for nuclear fuel storage which concerns on embodiment of this invention. It is a top view which shows the rack (group) for nuclear fuel storage of FIG. It is a top view which shows the modification of the rack (group) for nuclear fuel storage which concerns on embodiment of this invention. It is a top view which shows the modification of the rack (group) for nuclear fuel storage which concerns on embodiment of this invention. It is a side view which shows the rack (group) for nuclear fuel storage which concerns on the 9th reference example of this invention. It is a top view which shows the rack (group) for nuclear fuel storage of FIG. It is a top (cut) top view which shows the storage pit which stores the rack (group) for nuclear fuel storage which concerns on a 9th reference example, and the rack (group) for nuclear fuel storage. It is a perspective view explaining the storage pit of the nuclear fuel storage facility which stored the rack (group) for nuclear fuel storage. It is a perspective view which shows the conventional rack for nuclear fuel storage. It is a perspective view which shows the conventional rack for nuclear fuel storage. It is a side view explaining the state which rocking occurred in the conventional nuclear fuel storage rack, and the adjacent nuclear fuel storage racks collided.

(First Reference Example)
As shown in FIG. 30, in the present invention, for example, spent nuclear fuel generated at a nuclear power plant (used nuclear fuel rod) is stored in an aligned manner in the storage pit 3 of the nuclear fuel storage facility 2. The present invention relates to a nuclear fuel storage rack and a nuclear fuel storage rack group. In addition, water is stored in the storage pit 3, and a nuclear fuel storage rack (a group of nuclear fuel storage racks) is stored and stored in water.

  As shown in FIGS. 1 and 2, a nuclear fuel storage rack B according to a first reference example having a basic technology as a premise of the present invention is a rectangular parallelepiped rack for storing a plurality of used nuclear fuels (nuclear fuel assemblies). Arranged on the main body 6, support leg portions 5 that support the rack body 6 slidably with respect to the bottom surface 3 b of the storage pit 3, and left and right edges (both edges in the horizontal direction) of the side surface 7 of the rack body 6. And a collision member 8 protruding from the side surface 7.

  That is, the nuclear fuel storage rack B is a self-supporting rack, and the support legs 5 that support the rack body 6 are slidable with respect to the bottom surface 3b of the storage pit 3, so that the bottom surface 3b This is a so-called free-standing rack that can move relative to the vehicle.

The rack body 6 has a rectangular parallelepiped box shape with an opening at the top, and the inside of the rack body 6 is partitioned into a lattice shape, and is configured to be capable of storing a plurality of used nuclear fuels.
The support legs 5 have a multi-stage columnar shape, a plurality of protrusions are provided downward from the bottom of the rack body 6, and these are arranged at intervals. Specifically, these support leg portions 5 are arranged at the corners of the bottom portion, and the lower end portion thereof is formed with a diameter larger than that of the upper end portion.

  Further, the side surface 7 of the rack body 6 is four surfaces formed in a rectangular shape on the outer peripheral surface facing the side (horizontal direction) of the rack body 6, and includes the columns 6 a described in FIGS. 31 and 32. This is a concept including all the outer surfaces of the cross member 6b, the diagonal member 6c, the outer peripheral plate 6d, and the base plate 4.

  The collision member 8 is a rigid body made of, for example, a metal material, and is formed in a polygonal columnar shape such as a rectangular parallelepiped shape, a columnar shape, or a rod shape. In the illustrated example, the collision member 8 is formed in a rectangular parallelepiped shape. Further, the collision member 8 is provided at each of the left and right edge portions of the side surface 7, and a plurality of pairs (two pairs in the figure) are provided with the pair of left and right spaced apart from each other. Specifically, four collision members 8 are provided on the left and right edges and the upper and lower edges of the side surface 7, and four collision members 8 are provided corresponding to the corners of the side surface 7. Although not shown in FIGS. 1 and 2, the collision member 8 is provided on each of two or more side surfaces 7.

  Adjacent nuclear fuel storage racks B and B are arranged in the storage pit 3 with the collision members 8 and 8 arranged opposite to each other. Specifically, a slight gap is provided between the collision members 8 and 8. In the event of an earthquake, the gap causes the nuclear fuel storage rack B to move in a straight line, rotate, or lock in a horizontal direction with respect to the bottom surface 3b as indicated by an arrow in the figure. When B approaches, it is set small so that it may become in the range which mutual collision members 8 and 8 collide.

  As described above, the nuclear fuel storage rack B of the present reference example has the bottom surface 3b because the support leg 5 supporting the rack body 6 is slidable with respect to the bottom surface 3b of the storage pit 3. This is a so-called free-standing rack that can be moved relative to each other. In this case, when a large earthquake occurs, the nuclear fuel storage rack B moves so as to slide (slide) with respect to the bottom surface 3b to absorb the horizontal force generated by the earthquake. The direction becomes undefined (straight line and rotational movement in the horizontal direction indicated by arrows in the figure, rocking due to the overturning moment caused by the horizontal force, and these combined movements (not shown)). According to the nuclear fuel storage rack B of the present reference example, the collision members 8 protrude from the left and right edges of the side surface 7 of the rack body 6, so that the movement direction of the nuclear fuel storage rack B is as described above. Even if it is not fixed, the collision member 8 disposed between the adjacent nuclear fuel storage racks B and B (or the nuclear fuel storage rack B and the side wall 3a of the storage pit 3) A direct collision between the rack body 6 and the side wall 3a is prevented.

  Specifically, not only when the nuclear fuel storage rack B is moved linearly in the horizontal direction with respect to the bottom surface 3b, but also when the nuclear fuel storage rack B is rotated, the collision member 8 of the nuclear fuel storage rack B is adjacent. It collides with the other nuclear fuel storage rack B and the side wall 3a of the storage pit 3 to prevent the rack body 6 of the nuclear fuel storage rack B from colliding. Even when the nuclear fuel storage rack B is locked, the collision member 8 of the nuclear fuel storage rack B collides with another adjacent nuclear fuel storage rack B or the side wall 3 a of the storage pit 3. .

  Thus, since the collision location in the nuclear fuel storage rack B is specified by the collision member 8, the collision of the rack body 6 of the nuclear fuel storage rack B is reliably prevented. Therefore, the impact on the rack body 6 and the nuclear fuel assembly housed in the rack body 6 is sufficiently mitigated to protect them.

  In the above description, the collision member 8 is formed in a substantially rectangular parallelepiped shape, but the present invention is not limited to this. In addition, a plurality of pairs of the collision members 8 are provided on the left and right edge portions of the side surface 7 so as to be separated from each other in the vertical direction. However, the present invention is not limited to this. May be provided. Moreover, you may provide in the center part or / and the lower end part of the up-down direction in the said right-and-left edge part. However, when the collision member 8 is disposed at the upper end portion, when a large earthquake occurs, the collision member 8 collides before the nuclear fuel storage rack B is largely locked, and the nuclear fuel storage rack This is preferable because the amplitude of the swing of B can be suppressed.

Further, the collision member 8 may be formed in a columnar shape or a rod shape extending between the upper and lower end portions at the left and right edge portions of the side surface 7. The collision member 8 may also be disposed between the left and right edge portions of the side surface 7 (the center portion or the like).
In addition, the support leg 5 has a multi-stage columnar shape, and a plurality of support legs 5 protrude downward from the bottom of the rack body 6, but the support leg 5 is formed with respect to the bottom surface 3 b of the storage pit 3. Since the rack body 6 may be slidably supported, its shape and number are not limited.

(Second reference example)
Next, a nuclear fuel storage rack C according to a second reference example of the present invention and a nuclear fuel storage rack group D arranged using a plurality of the racks will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same member as the above-mentioned reference example, and the description is abbreviate | omitted.

  In the nuclear fuel storage rack C and the nuclear fuel storage rack group D of the second reference example, the arrangement of the collision member 8 on the side surface 7 is different from the reference example described above.

  That is, the collision member 8 is disposed on either of the left and right edges of the side surface 7 of the rack body 6 and protrudes from the side surface 7. Of the adjacent nuclear fuel storage racks C, C, the collision member 8 of one nuclear fuel storage rack C is disposed opposite to the side surface 7 of the other nuclear fuel storage rack C.

  That is, in this reference example, the nuclear fuel storage rack group D is configured by using a plurality of the same nuclear fuel storage racks C, and the adjacent nuclear fuel storage racks C and C are connected to each other with the collision member 8 and the side surface 7. It is installed so as to face each other.

  According to the nuclear fuel storage rack C and the nuclear fuel storage rack group D using the nuclear fuel storage rack C according to the present reference example, the nuclear fuel storage rack C includes the collision member 8 on either one of the left and right edges of the side surface 7 of the rack body 6. It is protruding. The collision member 8 is disposed so as to face the side surface 7 of another nuclear fuel storage rack (the other nuclear fuel storage rack) C adjacent to the nuclear fuel storage rack (one nuclear fuel storage rack) C. According to such a configuration, even when the movement direction of the nuclear fuel storage rack C is not determined when a large earthquake occurs, the collision member disposed between the adjacent nuclear fuel storage racks C, C is provided. 8 prevents a direct collision between the rack bodies 6 and 6.

  That is, since the adjacent nuclear fuel storage racks C and C collide with each other via the collision member 8, the impact of these nuclear fuel storage racks C on the rack body 6 is reliably mitigated, and the rack body. 6 and the nuclear fuel assembly housed in the rack body 6 are protected.

  In this case, the distance between the opposing side surfaces 7 of the nuclear fuel storage racks C adjacent to each other can be set to be relatively small, and the nuclear fuel storage racks C can be arranged so as to be closely packed. Therefore, the space in the storage pit 3 can be used effectively.

  In the above description, the nuclear fuel storage rack group D is configured by using a plurality of the same nuclear fuel storage racks C. However, the present invention is not limited to this. That is, since the collision member 8 of one nuclear fuel storage rack C only needs to be disposed opposite to the side surface 7 of the other nuclear fuel storage rack C, for example, nuclear fuel storage provided with collision members 8 having different shapes. The racks C and C may be arranged to constitute a nuclear fuel storage rack group D.

(Third reference example)
Next, a nuclear fuel storage rack E according to a third reference example of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same member as the above-mentioned reference example, and the description is abbreviate | omitted.

In the nuclear fuel storage rack E of the third reference example, the collision member 9 is deformed in accordance with the collision and is configured to be able to absorb the shock.
Specifically, instead of the above-described rigid collision member 8, the present reference example uses a collision member 9 configured to absorb impact by plastic deformation.

  As shown in FIG. 5, the collision member 9 has a rectangular tube shape extending vertically, and a cross section perpendicular to the extending direction is a rectangular frame shape. The collision member 9 is connected to a plate-like support body 9A erected from the side surface 7 of the rack body 6 and an end of the support body 9A opposite to the side surface 7 so as to be parallel to the side surface 7. And a plate-like collision body 9B formed as described above.

  Specifically, in the collision member 9, the support 9 </ b> A is provided as a pair spaced apart from each other in the left-right direction (the vertical direction in FIG. 5) of the side surface 7, and the collision body 9 </ b> B includes the ends of the support 9 </ b> A. It is spanned to connect.

  The collision member 9 is detachably disposed on the side surface 7 of the rack body 6. That is, the collision member 9 mounted on the rack body 6 can be removed from the side surface 7 and replaced with another collision member 9.

  According to the nuclear fuel storage rack E according to the present reference example, the collision member 9 is configured to be deformable in accordance with the collision and to absorb the impact. Therefore, when the collision member 9 receives the impact of the collision as described above, the impact is less likely to be transmitted to the rack body 6.

  Since the aforementioned deformation of the collision member 9 is specifically plastic deformation, for example, the collision member 9 can have a simple structure by using a metal plate or the like that is easily plastically deformed. Therefore, the cost for producing the collision member 9 is reduced. Further, the performance (impact absorbing ability) of the collision member 9 can be easily confirmed by visual observation. That is, the collision member 9 that has been plastically deformed and collapsed due to an earthquake or the like may not perform sufficiently when the next earthquake occurs, but such a collision member 9 is visually recognized. It's easy to do.

  The collision member 9 includes a plate-like support body 9A erected from the side surface 7 and a plate-like collision body 9B connected to the end portion of the support body 9A. With this configuration, when an earthquake occurs, the collision body 9B formed so as to be parallel to the side surface 7 of the rack body 6 reliably receives the impact of the collision and supports the collision body 9B and the support body 9A. These connecting portions are more easily plastically deformed. Therefore, the impact absorbing effect by the collision member 9 can be obtained with certainty.

  Even if the collision member 9 is plastically deformed and crushed by absorbing the impact, it can be replaced with another new collision member 9. Therefore, even if an earthquake or the like repeatedly occurs, the above-described effects can be repeatedly obtained by replacing the impact member 9 which has been plastically deformed with a new one.

In the above description, the collision member 9 has a rectangular tube shape. However, the present invention is not limited to this.
6 and 7 show a modification of the present reference example.

  The collision member 9 shown in FIG. 6 has an L-shaped cross section along the horizontal direction. Also in the collision member 9, like the collision member 9 described above, a plate-like support 9 </ b> A standing from the side surface 7 of the rack body 6, and an end of the support 9 </ b> A opposite to the side surface 7. And a plate-like collision body 9B formed so as to be parallel to the side surface 7. However, in this example, the collision body 9B is supported by the support body 9A in a cantilever state, and these connecting portions and the support body 9A are more easily plastically deformed. Therefore, the above-mentioned effect can be obtained more reliably.

  In FIG. 6, the collision body 9 </ b> B is formed so as to extend from the end of the support body 9 </ b> A toward the inner side in the left-right direction on the side surface 7 (upper side in FIG. 6). On the contrary, it may be extended toward the outer side in the left-right direction (the lower side in FIG. 6).

  Further, in the collision member 9 shown in FIG. 7, the extending direction of the collision body 9B is set differently between the collision members 9 and 9 facing each other in the adjacent nuclear fuel storage racks E and E. That is, of the adjacent nuclear fuel storage racks E and E, the collision member 9 in one nuclear fuel storage rack E1 has the collision body 9B extending from the end of the support 9A toward the outer side in the lateral direction on the side surface 7. It is installed. In the collision member 9 in the other nuclear fuel storage rack E2, the collision body 9B extends from the end of the support 9A toward the inner side in the left-right direction on the side surface 7.

  The collision body 9B is disposed between the side surface 7 of the other adjacent nuclear fuel storage rack E and the collision body 9B of the collision member 9 disposed on the side surface 7. That is, the collision body 9B of the collision member 9 of the one (other) nuclear fuel storage rack E1 (E2) is provided on the side surface 7 of the other (one) nuclear fuel storage rack E2 (E1) and on this side surface 7. It arrange | positions between the collision bodies 9B of the collision member 9. FIG.

  In this case, the collision member 9 of the nuclear fuel storage rack E not only collides with the side surface 7 of another adjacent nuclear fuel storage rack E and plastically deforms to absorb the impact, but also adjoins the nuclear fuel storage racks E, E. When the relative movement is performed in the direction in which they are separated from each other, the following effects are produced. That is, during the relative movement, the collision bodies 9B and 9B of the adjacent nuclear fuel storage racks E and E are engaged with each other, and the nuclear fuel storage racks E and E are restricted from being further separated from each other. . Thereby, even if these nuclear fuel storage racks E and E approach again and the collision member 9 collides, the impact is suppressed. Further, when attention is paid to the impact when the collision bodies 9B and 9B are engaged with each other, the collision body 9B and the connecting portion with the support body 9A are easily deformed plastically. Alleviated.

  Thus, since the opposing collision members 9, 9 are arranged so as to be able to engage with each other, the nuclear fuel storage rack E moves in an unexpected direction when an earthquake occurs. Even when locked, the collision members 9 are engaged (engaged) with each other, so that the amplitude of the swing of the nuclear fuel storage rack E can be reliably suppressed, and the impact of the collision of the collision member 9 can be reduced. it can.

  Furthermore, in the top view of FIG. 7, a region S having a substantially rectangular cross section is defined so as to be surrounded by the opposing collision members 9 and 9. The region S is formed so as to be sandwiched between the opposing collision bodies 9B and 9B and the opposing support bodies 9A and 9A. Water is present in this region S, and the following effects are produced when an earthquake occurs.

  That is, when the adjacent nuclear fuel storage racks E and E move relative to each other in a direction approaching each other (direction in which the interval between the collision bodies 9B and 9B increases), negative pressure is generated in the region S (the fluid resistance is large Therefore, the relative movement is suppressed. Further, when adjacent nuclear fuel storage racks E and E move relative to each other in a direction away from each other (a direction in which the interval between the collision bodies 9B and 9B is reduced), positive pressure is generated in the region S (the fluid resistance is large). Therefore, the relative movement is suppressed.

  As described above, the movement and locking of the nuclear fuel storage rack E are surely suppressed by the fluid-added damping effect of water existing in the region S. In addition, when this collision member 9 is provided extending in the up-down direction of the side surface 7, the above-mentioned effect will be acquired more notably.

  Further, the distance between the facing side surfaces 7 of the adjacent nuclear fuel storage racks E, E can be set to be relatively small, and the nuclear fuel storage racks E can be arranged so as to be closely packed. Therefore, the space in the storage pit 3 can be used effectively.

(4th reference example)
Next, a nuclear fuel storage rack F according to a fourth reference example of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same member as the above-mentioned reference example, and the description is abbreviate | omitted.

The nuclear fuel storage rack F of the fourth reference example is different from the nuclear fuel storage rack E described above in the shape of the support 9A of the collision member 9.
The support 9 </ b> A in the collision member 9 of the nuclear fuel storage rack F is formed so as to be gradually inclined toward any one of the surface directions of the side surface 7 as it is separated from the side surface 7 of the rack body 6. Specifically, the support 9 </ b> A is formed so as to be gradually inclined toward one of the left and right directions of the side surface 7 as it is separated from the side surface 7.

  The collision member 9 is provided so as to extend vertically at the left and right edge portions of the side surface 7, and as shown in FIG. 8, the cross section perpendicular to the extending direction is substantially C-shaped. A pair of support bodies 9A of the collision member 9 are provided apart from each other in the lateral direction of the side surface 7 (vertical direction in FIG. 8). It is spanned to connect the ends. The pair of supports 9 </ b> A and 9 </ b> A are formed to be inclined so as to gradually approach each other as the distance from the side surface 7 increases.

  According to the nuclear fuel storage rack F according to this reference example, the same effects as those of the above-described reference example can be obtained, and the following effects can be obtained. That is, since the support body 9A is erected from the side surface 7 of the rack body 6, the collision member 9 is more easily plastically deformed by the impact of the collision. Accordingly, the effect of reducing the impact transmitted to the rack body 6 is further enhanced.

In the above description, the collision member 9 has a C-shaped cross section. However, the present invention is not limited to this.
9 to 12 show a modification of this reference example.

  The collision member 9 shown in FIG. 9 is formed so that the cross section along the horizontal direction forms an L shape that opens at an obtuse angle. In this example, the collision body 9B is supported by the support body 9A in a cantilever state, and these connecting portions and the support body 9A are more easily plastically deformed.

  In FIG. 9, the collision body 9B is formed so as to extend from the end of the support body 9A toward the inner side in the left-right direction on the side surface 7 (upper side in FIG. 9). On the contrary, it may be extended toward the outer side in the left-right direction (the lower side in FIG. 9).

  Further, in the collision member 9 shown in FIG. 10, the extending direction of the collision body 9B is set differently between the collision members 9 and 9 facing each other in the adjacent nuclear fuel storage racks F and F. The collision body 9B of the collision member 9 of one (other) nuclear fuel storage rack F1 (F2) is provided on the side surface 7 of the other (one) nuclear fuel storage rack F2 (F1) and on this side surface 7. It arrange | positions between the collision bodies 9B of the collision member 9. FIG.

Further, in the top view of FIG. 10, a region S having a substantially parallelogram section is defined so as to be surrounded by the opposing collision members 9, 9. Further, as shown in FIG. 11, the collision member 9 is formed to extend in the vertical direction of the side surface 7. Further, the nuclear fuel storage rack F provided with the collision member 9 is arranged in the storage pit 3 as, for example, a nuclear fuel storage rack group as shown in a top view of FIG.
According to such a configuration, the above-described effects can be reliably obtained.

(5th reference example)
Next, a nuclear fuel storage rack G according to a fifth reference example of the present invention and a nuclear fuel storage rack group H arranged by using a plurality thereof will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same member as the above-mentioned reference example, and the description is abbreviate | omitted.

  The nuclear fuel storage rack G and the nuclear fuel storage rack group H of the fifth reference example are different in the collision member 10 from the above-described reference example. The collision member 10 is made of a metal body having a sponge-like structure. Specifically, the collision member 10 is made of a porous metal material having pores therein, and is formed of, for example, a stainless sponge-like cushion material.

  The collision member 10 has, for example, a polygonal columnar shape such as a rectangular parallelepiped shape, a columnar shape, or a rod shape, and is disposed on at least one of the left and right edges of the side surface 7 of the rack body 6. It protrudes.

  In the example shown in FIG. 13, the collision member 10 is disposed on any of the left and right edges of the side surface 7 of the rack body 6 and protrudes from the side surface 7. In addition to the members disposed on the left and right edge portions, a plurality of the collision members 10 are disposed on the side surface 7 at intervals in the left-right direction. Of the adjacent nuclear fuel storage racks G, G (nuclear fuel storage rack group H), the collision member 10 of one nuclear fuel storage rack G is disposed to face the side surface 7 of the other nuclear fuel storage rack G. Yes.

  Further, in the example shown in FIG. 14, the collision member 10 is disposed on both the left and right edges of the side surface 7 of the rack body 6 and protrudes from the side surface 7. Adjacent nuclear fuel storage racks G and G are arranged with the collision members 10 and 10 facing each other. In addition, a slight gap is provided between the opposing collision members 10 and 10.

  The collision member 10 is detachably disposed on the side surface 7 of the rack body 6. That is, the collision member 10 mounted on the rack body 6 can be removed from the side surface 7 and replaced with another collision member 10.

  According to the nuclear fuel storage rack G and the nuclear fuel storage rack group H according to this reference example, the same effects as those of the above-described reference example can be obtained, and the following effects can be obtained. That is, since the collision member 10 is made of a metal body having a sponge-like structure, a certain degree of rigidity can be ensured while the plastic member can be reliably plastically deformed by an impact caused by the collision, and the collision member 10 can be easily formed by the collision. Damage and crushing are prevented.

(Sixth reference example)
Next, a nuclear fuel storage rack I according to a sixth reference example of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same member as the above-mentioned reference example, and the description is abbreviate | omitted.

  As shown in FIG. 15, in the nuclear fuel storage rack I of the sixth reference example, a pair of collision members are disposed on the left and right edges of the side surface 7 of the rack body 6, and the collision members 11, 12 are The rigidity is set to be different from each other. That is, of the pair of collision members 11, 12, one collision member 11 is set to be lower in rigidity than the other collision member 12, and is configured to plastically deform and absorb the impact. Adjacent nuclear fuel storage racks I and I make the side surfaces 7 and 7 face each other, and the collision member 12 having high rigidity and the collision member 11 having low rigidity face each other.

  The collision member 11 has, for example, a rectangular tube shape, and a cross section along the horizontal direction is a rectangular frame shape. The collision member 11 is connected to a plate-like support 11A erected from the side surface 7 of the rack body 6 and an end of the support 11A opposite to the side surface 7, and is parallel to the side surface 7. And a plate-like collision body 11B formed in such a manner.

  Specifically, in the collision member 11, a pair of support bodies 11A are provided apart from each other in the lateral direction of the side surface 7, and the collision bodies 11B are bridged so as to connect the end portions of the support bodies 11A. Has been. In the illustrated example, the collision body 11B is set to be thinner than the support body 11A and is easily deformed.

  Moreover, the collision member 12 consists of a hemispherical rigid body, for example, and the cross section along a horizontal direction is made into semicircle shape. The collision member 12 has a convex spherical surface (convex curved surface) that faces away from the side surface 7, and the protruding portion 12 </ b> A that protrudes most away from the side plate 7 is adjacent to another nuclear fuel storage. In the rack I, the collision member 11 is disposed so as to face the collision body 11B.

  The collision members 11 and 12 are detachably disposed on the side surface 7 of the rack body 6. That is, the collision members 11 and 12 mounted on the rack body 6 can be removed from the side surface 7 and replaced with other collision members 11 and 12.

  According to the nuclear fuel storage rack I according to the present reference example, the same effects as those of the reference example described above can be obtained, and the following effects can be obtained. That is, when an earthquake occurs, the collision members 11 and 12 having different rigidity collide with each other, and the collision member 11 with low rigidity is surely plastically deformed. Therefore, the impact absorbing effect by these collision members 11 and 12 can be obtained with certainty.

  In the above description, the collision member 12 is formed in a hemispherical shape, but the present invention is not limited to this. That is, for example, the collision member 12 is made of a rod having a semicircular cross section formed so that a round bar is divided in half along the axis, and the collision member 12 extends in the vertical direction of the side surface 7. May be. Moreover, the collision member 12 may be formed in the cross-sectional triangle shape which has 12 A of protrusion parts. Alternatively, the collision member 12 may be formed in a rectangular parallelepiped shape, a rectangular tube shape, or the like having higher rigidity than the collision member 11.

(Seventh reference example)
Next, a nuclear fuel storage rack J according to a seventh reference example of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same member as the above-mentioned reference example, and the description is abbreviate | omitted.

  As shown in FIG. 16, in the nuclear fuel storage rack J of the seventh reference example, the collision member 13 is close to the support body 13A erected from the side surface 7A (7) of the rack body 6 and the side surface 7A. A collision body 13B that is slidable in a separating direction and supported by the support body 13A, and is interposed between the support body 13A and the collision body 13B to resist the approaching movement of the collision body 13B with respect to the side surface 7A. And an intermediate portion 13C that acts as described above.

  In the collision body 13B, the end surface facing the side opposite to the side surface 7A is opposed to the side surface 7B (7) of the adjacent nuclear fuel storage rack J in a state of approaching (or abutting). Further, as the intermediate portion 13C, for example, water stored in the storage pit 3 or other fluid, a compression coil spring (elastic body), or the like is used.

  According to the nuclear fuel storage rack J according to this reference example, when the collision body 13B collides and receives an impact, the collision member 13 acts like a damper mechanism to sufficiently reduce the impact and rack. It will be transmitted to the main body 6. That is, when the collision body 13B collides with the side surface 7B of the adjacent nuclear fuel storage rack J and receives an impact, the collision body 13B slides with respect to the support body 13A toward the side surface 7A. However, at this time, since the intermediate portion 13C acts to resist this sliding, the sliding momentum of the collision body 13B is suppressed. Thereby, the impact absorption effect by the collision member 13 is sufficiently obtained.

  In the above description, the collision member 13 has the collision body 13B opposed to the side surface 7B. However, the present invention is not limited to this. That is, for example, the collision body 13B of the collision member 13 on the side surface 7A may be disposed to face the collision body 13 of the other collision member 13 provided on the side surface 7B.

(Eighth reference example)
Next, a nuclear fuel storage rack K according to an eighth reference example of the present invention and a nuclear fuel storage rack group L arranged using a plurality of the racks will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same member as the above-mentioned reference example, and the description is abbreviate | omitted.

In the nuclear fuel storage rack K and the nuclear fuel storage rack group L of the eighth reference example, the collision member 14 is configured to absorb the impact by elastic deformation.
As shown in FIGS. 17 and 18, the collision member 14 includes a convex collision portion 14 </ b> A protruding from the side surface 7.

  Specifically, the collision member 14 is formed so as to curve an elastically deformable leaf spring material having a rectangular plate shape or a belt plate shape into an arcuate shape. As shown in FIG. 17, the collision member 14 is formed so as to extend in the vertical direction on the side surface 7, and both end portions in the extending direction are fixed to the side surface 7. Further, the collision member 14 is formed to bulge so that the vicinity of the central portion along the vertical direction is farthest from the side surface 7, and the vicinity of the central portion is a collision portion 14 </ b> A. The collision portion 14 </ b> A has a convex curved shape that protrudes in a direction away from the side surface 7.

  As shown in FIG. 18, the collision member 14 is disposed on either of the left and right edges of the side surface 7 of the rack body 6 and protrudes from the side surface 7. In addition to the members disposed on the left and right edge portions, a plurality of the collision members 14 are disposed on the side surface 7 at intervals in the left-right direction. Of the adjacent nuclear fuel storage racks K and K (nuclear fuel storage rack group L), the collision member 14 of one nuclear fuel storage rack K is disposed to face the side surface 7 of the other nuclear fuel storage rack K. Yes.

  The collision member 14 is detachably disposed on the side surface 7 of the rack body 6. That is, the collision member 14 mounted on the rack body 6 can be removed from the side surface 7 and replaced with another collision member 14.

  According to the nuclear fuel storage rack K and the nuclear fuel storage rack group L according to this reference example, since the collision member 14 is elastically deformed, even if it is deformed by the impact of the collision, the shape is restored, and the impact is repeatedly reduced. be able to. Therefore, even if the earthquake repeatedly occurs, the above-described effects can be stably achieved.

  Further, the collision member 14 includes a convex collision portion 14 </ b> A protruding from the side surface 7 of the rack body 6. Thus, since the collision part 14A protrudes, the collision member 14 receives the impact of the collision with certainty from the collision part 14A. Then, the impact is reliably absorbed by the elastic deformation of the collision portion 14A.

  Further, of the adjacent nuclear fuel storage racks K and K (nuclear fuel storage rack group L), the collision member 14 of one nuclear fuel storage rack K is disposed to face the side surface 7 of the other nuclear fuel storage rack K. Yes. As a result, the distance between the opposing side surfaces 7 of the nuclear fuel storage racks K, K can be set to be relatively small, and the nuclear fuel storage racks K can be arranged in an aligned manner. Therefore, the space in the storage pit 3 can be used effectively.

  In the above description, of the adjacent nuclear fuel storage racks K, K (nuclear fuel storage rack group L), the collision member 14 of one nuclear fuel storage rack K is the side surface 7 of the other nuclear fuel storage rack K. However, the present invention is not limited to this. That is, for example, the adjacent nuclear fuel storage racks K, K may have the collision members 14, 14 on the side surfaces 7, 7 opposed to each other.

  Moreover, although the collision member 14 was formed so that the leaf | plate spring material of a rectangular plate shape or a strip | belt plate shape might be curved in the shape of a bow, it is not limited to this. That is, for example, the collision member 14 may be a substantially hemispherical spherical spring material formed by dividing (dividing) a sphere, and the collision portion 14A may have a convex spherical shape. . In this case, it is preferable that the collision member 14 is fixed to the side surface 7 at a plurality of locations at intervals in the circumferential direction at the outer peripheral edge portion of the collision member 14.

Moreover, FIGS. 19-22 has shown the modification of this reference example.
As shown in FIG. 19, a plurality of collision members 14 may be provided on the side surface 7 so as to be separated in the vertical direction. In this example, the upper and lower ends of the collision member 14 are fixed to the side surface 7 as shown in FIG.

  Further, as shown in FIG. 20B, the collision member 14 has one end of the upper and lower ends fixed to the side surface 7 and the other end slidable on the side 7. It may be. In this case, when the collision member 14 collides and receives an impact, the impact force is also distributed in the vertical direction, and the impact absorbing ability of the collision member 14 is further enhanced.

  Further, as shown in FIG. 21A, the collision member 14 has a substantially trapezoidal cross section, the collision portion 14A is the upper bottom portion, and the front end surface of the collision portion 14A is substantially parallel to the side surface 7. It may be a flat surface. In this case, the collision portion 14A is easily elastically deformed by an external force (impact of collision). In this example, the collision member 14 has one end portion of the upper and lower end portions fixed to the side surface 7 and the other end portion disposed between the side surface 7 with a slight gap. Yes. Thereby, this collision member 14 becomes easy to disperse | distribute the impact force of a collision by the up-down direction, and an impact absorption capability is improved.

  Further, in the collision member 14 shown in FIG. 21 (b), the other end is arranged with a slight gap between the side surface 7 and the collision member 14 described in FIG. 20 (b). Different in that it is. Also in this case, the effect of dispersing the impact force in the vertical direction is further enhanced.

  Further, in the example of FIG. 22, a plurality of collision members 14 are arranged on the side surface 7 so as to be spaced apart in the left-right direction (vertical direction in FIG. 22), and each of the collision members 14 extends in the left-right direction. Is formed. And the collision members 14 and 14 of the adjacent nuclear fuel storage racks K and K are opposingly arranged. That is, the direction (extending direction) in which the collision member 14 is disposed on the side surface 7 is not limited.

(Embodiment of the present invention)
Next, a nuclear fuel storage rack M according to an embodiment of the present invention and a nuclear fuel storage rack group N arranged using a plurality of the racks will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same member as the above-mentioned reference example, and the description is abbreviate | omitted.

  As shown in FIGS. 23 and 24, in the nuclear fuel storage rack M and the nuclear fuel storage rack group N of the present embodiment, the collision member 15 is formed of an elastically deformable corrugated leaf spring material. . In the illustrated example, the collision member 15 extends in the vertical direction on the side surface 7 and is formed so as to meander alternately in the direction of approaching and separating from the side surface 7 to form a corrugated plate as a whole. .

  Specifically, the collision member 15 is located between a plurality of convex collision parts 15A protruding from the side surface 7 and the adjacent collision parts 15A, 15A, and connects the collision parts 15A. And a concave support portion 15B that contacts and supports the collision portion 15A. In addition, at least one of the upper and lower ends of the collision member 15 is fixed to the side surface 7. The collision portion 15 </ b> A has a convex curved shape protruding in a direction away from the side surface 7. Further, the support portion 15 </ b> B has a concave curved surface shape that is recessed toward the side surface 7.

  As shown in FIG. 24, the collision member 15 is disposed on either one of the left and right edges of the side surface 7 of the rack body 6 and protrudes from the side surface 7. In addition to the members disposed on the left and right edge portions, a plurality of the collision members 15 are disposed on the side surface 7 at intervals in the left-right direction. Of the adjacent nuclear fuel storage racks M, M (nuclear fuel storage rack group N), the collision member 15 of one nuclear fuel storage rack M is disposed to face the side surface 7 of the other nuclear fuel storage rack M. Yes.

  The collision member 15 is detachably disposed on the side surface 7 of the rack body 6. That is, the collision member 15 mounted on the rack body 6 can be removed from the side surface 7 and replaced with another collision member 15.

  According to the nuclear fuel storage rack M and the nuclear fuel storage rack group N according to the present embodiment, the same effects as those of the reference example described above can be obtained, and the following effects can be obtained. In other words, the collision member 15 receives impacts of collision from a plurality of collision parts 15A protruding from the side surface 7 of the rack body 6, and the collision parts 15A are elastically deformed. The supporting portion 15B to be supported is elastically deformed to surely reduce the impact.

  In the above description, of the adjacent nuclear fuel storage racks M, M (nuclear fuel storage rack group N), the collision member 15 of one nuclear fuel storage rack M is the side surface 7 of the other nuclear fuel storage rack M. However, the present invention is not limited to this. FIG. 25 shows a modification of the present embodiment. As illustrated, adjacent nuclear fuel storage racks M and M may be configured such that the collision members 15 and 15 on the side surfaces 7 and 7 facing each other face each other.

  In the example shown in FIG. 25, the opposing collision members 15, 15 of the adjacent nuclear fuel storage racks M, M are connected to each other by an annular connecting body 16. Specifically, the connecting body 16 is inserted between the side surface 7 and the collision portion 15A, and is disposed on the locking portion 16A capable of contacting the collision portion 15A and the adjacent nuclear fuel storage racks M and M, respectively. The locking portions 16A and 16A are connected to each other to connect the locking portions 16A and 16A. The coupling body 16 can be attached to and detached from the collision member 15 by removing at least a part of the ring.

  Specifically, the connecting body 16 has a pair of locking portions 16A that are axially formed and extend substantially parallel to each other, and a pair of locking portions 16A that are shaft-shaped and extend substantially parallel so as to connect the ends of the locking portions 16A. And a connecting portion 16B. In the illustrated example, the locking portions 16A and the connecting portions 16B extend in the horizontal direction. In addition, you may connect 16 A of locking parts using one, without providing a pair of connection parts 16B. In this case, the connection body 16 is formed in a substantially U shape.

  When the configuration shown in the example of FIG. 25 is used, the locking portions 16A and 16A respectively arranged in the adjacent nuclear fuel storage racks M and M are connected by the connecting portion 16B. When M and M move relative to each other in a direction away from each other, the locking portion 16A comes into contact with the collision portion 15A from the side surface 7 side (from the inner side), and the nuclear fuel storage racks M and M are further connected to each other. The separation is restricted. Thereby, even if these nuclear fuel storage racks M and M come close again and the collision part 15A collides, the impact is suppressed. When attention is paid to the impact when the locking portion 16A comes into contact with the collision portion 15A, the impact portion 15A can be elastically deformed.

  Further, in the modification of the present embodiment shown in FIG. 26, the corrugated collision member 15 is provided to extend in the horizontal direction on the side surface 7. A collision portion 15 </ b> A is formed at each end of the collision member 15 corresponding to at least the left and right edge portions of the side surface 7. In the example shown in the drawing, the connecting member 16 is formed in a substantially U shape and inserted into the collision member 15 from the upper side to the lower side.

(Ninth Reference Example)
Next, a nuclear fuel storage rack O according to a ninth reference example of the present invention and a nuclear fuel storage rack group P arranged using a plurality of the racks will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same member as the above-mentioned reference example and embodiment, and the description is abbreviate | omitted.

  In the nuclear fuel storage rack O and the nuclear fuel storage rack group P of the ninth reference example, the collision member 17 is bonded to one of the collision member 17 and the side surface 7 of another adjacent nuclear fuel storage rack O.

  In the example shown in FIGS. 27 and 28, the adjacent nuclear fuel storage racks O and O have the collision members 17 and 17 arranged to face each other, and the collision members 17 and 17 are in contact with each other. In the state, it is bonded with an adhesive or the like. As shown in FIG. 29, the nuclear fuel storage rack group P is configured by arranging a plurality of nuclear fuel storage racks O in a densely arranged manner so as to spread in the storage pit 3.

  Although not particularly illustrated, the collision member 17 may be adhered to the side surface 7 with an adhesive or the like in a state of being in contact with the side surface 7 of another adjacent nuclear fuel storage rack O. In this case, the nuclear fuel storage rack group P is configured more compactly.

  According to the nuclear fuel storage rack O and the nuclear fuel storage rack group P according to the present reference example, the collision member 17 is bonded to either the collision member 17 or the side surface 7 of another adjacent nuclear fuel storage rack O. Therefore, these nuclear fuel storage racks O are integrated with each other via the collision member 17 located between the side surfaces 7 and 7. In this case, the arrangement interval between the nuclear fuel storage racks O, O is narrowed, and the nuclear fuel storage racks O are arranged so as to be spread in the storage pit 3. Thereby, when the earthquake occurs, the magnitude of the amplitude at which the nuclear fuel storage rack O swings is suppressed, so that the collision load of the collision member 17 is reduced.

  Further, in this case, the adjacent nuclear fuel storage racks O, O integrated as a result of the collision member 17 being bonded are also prevented from shaking in a direction away from each other. Therefore, for example, even if a relatively large space is provided on the side of the nuclear fuel storage rack O, the nuclear fuel storage rack O is prevented from falling toward the space.

  29, among the nuclear fuel storage racks O (nuclear fuel storage rack group P) arranged in alignment, the outermost nuclear fuel storage rack O1 is the side wall of the storage pit 3 among the side surfaces 7. The collision member 17 disposed on the side surface 7 facing the 3a is disposed close to the side wall 3a, and a predetermined amount is provided between the collision member 17 and the side wall 3a in anticipation of thermal expansion of the nuclear fuel storage rack O. Gap α is provided.

  Specifically, the gap α is set with an expectation of, for example, about 0.7 mm per meter of elongation due to thermal expansion of the nuclear fuel storage rack O. That is, when the storage pit 3 is set to a size of 15 m × 15 m in a top view, a gap α of about 0.7 mm × 15 m = 11 mm is set.

  Thus, the collision member 17 facing the side wall 3a side of the storage pit 3 in the outermost nuclear fuel storage rack O1 among the nuclear fuel storage racks O arranged in alignment is arranged close to the side wall 3a. Therefore, when an earthquake occurs, the collision member 17 comes into contact with the side wall 3a, and the nuclear fuel storage rack O1 is reliably prevented from falling toward the side wall 3a.

  A gap (predetermined gap) α is set between the collision member 17 and the side wall 3a in anticipation of thermal expansion of the plurality of aligned nuclear fuel storage racks O. As a result, even if the nuclear fuel storage racks O are arranged so as to be laid out, the thermal expansion of the nuclear fuel storage racks O can be absorbed by the gap α. Therefore, no thermal stress is generated in the nuclear fuel storage rack O due to such thermal expansion. In addition, the provision of the clearance α does not hinder the operation of installing the nuclear fuel storage rack O in the storage pit 3.

  Although not particularly illustrated, in the nuclear fuel storage rack O1 located on the outermost side, spent fuel is supplied to the vertical cell 1 arranged close to the side wall 3a in the vertical cell (rack cell) 1 of the rack body 6. Instead of storing, it is preferable to store new fuel, spent fuel that has been sufficiently cooled, fuel rods such as control rods and burnable poisons. Thereby, even when the nuclear fuel storage rack O1 moves, locks and collides with the side wall 3a when an earthquake occurs, the side wall 3a is prevented from being damaged.

  The first to ninth reference examples and the embodiments of the present invention have been described above. However, the nuclear fuel storage racks (groups) B to P described in the reference examples and embodiments are not yet installed in the storage pit 3. Are structures that are divided from each other, and each is set to an external dimension that can be transported by land. Specifically, each nuclear fuel storage rack has an outer dimension that can be accommodated in or slightly smaller than a transport container used for land transportation, and can be transported by either land transportation or sea transportation. The transport container is a known general container. As described above, when the nuclear fuel storage rack is set to an outside dimension that can be transported by land, transport to the inland portion is possible and transportation costs are greatly reduced. Specifically, in general, there is a cost difference of about 10 (marine): 1 (land) between maritime transportation costs and land transportation costs (or a cost difference of 10 or more: 1). It is preferable that it can be transported by land.

In order to prevent the nuclear fuel storage racks from overturning, the width of the rack body 6 in the horizontal plane direction is set to be wide or set to a size that can be transported by land. Just connect.
That is, the nuclear fuel storage rack may be set to an outer shape that can be accommodated in a land transportation container.
The support legs 5 are disposed at the four corners on the lower surface of the rack body 6, and the distance (interaxial distance) between the pair of support legs 5, 5 adjacent to each other in the left-right direction of the side surface 7 is the rack body. It is good also as setting so that the fall of 6 can be prevented.

  Further, in the first to eighth reference examples and the embodiment of the present invention, a nuclear fuel storage rack group in which a plurality of nuclear fuel storage racks are arranged and arranged is disposed in the entire area of the storage pit 3, Among these nuclear fuel storage racks, the collision member facing the side wall 3a of the storage pit 3 in the outermost nuclear fuel storage rack may be disposed close to the side wall 3a. In this case, as in the ninth reference example, the nuclear fuel storage rack moves toward the side wall 3a when an earthquake occurs, even if the collision members facing each other in the adjacent nuclear fuel storage racks are not bonded to each other. It is possible to prevent falling down.

  In other words, the aligned nuclear fuel storage racks are accommodated so as to be close to each other in the region surrounded by the side wall 3a of the storage pit 3, and the outermost nuclear fuel storage rack is the side surface 7. Among them, the collision member disposed on the side surface 7 facing the side wall 3a of the storage pit 3 may be disposed close to the side wall 3a.

  In addition, the constituent elements in the reference examples and the embodiments described above can be appropriately replaced with known constituent elements, and the constituent elements may be appropriately combined without departing from the gist of the present invention.

3 Storage pit 3a Storage pit side wall 3b Storage pit bottom wall (bottom)
5 Support legs 6 Rack body 7, 7A, 7B Side surfaces of rack body 8, 9, 10, 11, 12, 13, 14, 15, 17 Colliding member 9A, 11A, 13A Support body 9B, 11B, 13B Colliding body 13C Intermediate part 15A Collision part 15B Support part 16A Locking part 16B Connecting part B, C, E, E1, E2, F, G, I, J, K, M, O, O1 Nuclear fuel storage racks D, H, L, N, P Rack group for nuclear fuel storage α Clearance

Claims (13)

A nuclear fuel storage rack that is stored in an aligned arrangement in a storage pit with a nuclear fuel assembly stored therein,
A rectangular parallelepiped rack body that houses the nuclear fuel assembly;
A support leg for supporting the rack body slidably with respect to the bottom surface of the storage pit;
A collision member disposed on the left and right edges of the side surface of the rack body and protruding from the side surface,
The collision member is positioned between a plurality of convex collision parts protruding from the side surface and the adjacent collision parts and connects the collision parts, and abuts on the side surface to support the collision part. A nuclear fuel storage rack, comprising: a concave support portion. The nuclear fuel storage rack according to claim 1,
The nuclear fuel storage rack according to claim 1, wherein the collision member is deformed in accordance with the collision and is configured to be able to absorb the shock. A nuclear fuel storage rack according to claim 2,
The nuclear fuel storage rack according to claim 1, wherein the collision member is configured to absorb an impact by plastic deformation. A nuclear fuel storage rack according to any one of claims 1 to 3,
The nuclear fuel storage rack, wherein the collision member is detachably disposed on the side surface. A rack for storing nuclear fuel according to any one of claims 1 to 4,
A nuclear fuel storage rack, wherein the pair of collision members disposed on the left and right edges of the side surface are set to have different rigidity. A nuclear fuel storage rack according to any one of claims 2 to 5,
The nuclear fuel storage rack according to claim 1, wherein the collision member is configured to absorb an impact by elastic deformation. A nuclear fuel storage rack according to any one of claims 1 to 6,
A locking portion that is inserted between the side surface and the collision portion and is capable of contacting the collision portion;
A nuclear fuel storage rack, comprising: a connecting portion that connects the locking portions respectively arranged in adjacent nuclear fuel storage racks. A nuclear fuel storage rack according to any one of claims 1 to 7,
The nuclear fuel storage rack according to claim 1, wherein the collision member is bonded to either one of the collision member and the side surface of another adjacent nuclear fuel storage rack. A nuclear fuel storage rack according to claim 8,
Of the nuclear fuel storage racks arranged in alignment, the nuclear fuel storage rack located on the outermost side is such that the collision member disposed on the side surface of the side surface opposite to the side wall of the storage pit approaches the side wall. Arranged,
A nuclear fuel storage rack, wherein a predetermined gap is provided between the collision member and the side wall in anticipation of thermal expansion of the nuclear fuel storage rack. A nuclear fuel storage rack according to any one of claims 1 to 9,
The aligned nuclear fuel storage racks are accommodated so as to be close to each other in a region surrounded by the side wall of the storage pit, and the outermost nuclear fuel storage rack is the side of the side surface of the storage rack. A nuclear fuel storage rack, wherein the collision member disposed on a side surface facing a side wall of a storage pit is disposed close to the side wall. A nuclear fuel storage rack according to any one of claims 1 to 10,
The support legs are arranged at four corners on the lower surface of the rack body,
The nuclear fuel storage rack according to claim 1, wherein a distance between the pair of support legs adjacent to each other in the lateral direction of the side surface is set so as to prevent the rack body from falling down. A nuclear fuel storage rack according to any one of claims 1 to 11,
A nuclear fuel storage rack having an outer shape that can be accommodated in a container for land transportation. A nuclear fuel storage rack group in which nuclear fuel storage racks stored in a storage pit in a state in which a nuclear fuel assembly is housed are aligned and arranged,
The nuclear fuel storage rack is:
A rectangular parallelepiped rack body that houses the nuclear fuel assembly;
A support leg for supporting the rack body slidably with respect to the bottom surface of the storage pit;
A collision member disposed on either of the left and right edge portions of the side surface of the rack body, and protruding from the side surface,
The collision member is positioned between a plurality of convex collision parts protruding from the side surface and the adjacent collision parts and connects the collision parts, and abuts on the side surface to support the collision part. A concave support portion, and
The nuclear fuel storage rack group, wherein the collision member of one nuclear fuel storage rack among the adjacent nuclear fuel storage racks is disposed to face the side surface of the other nuclear fuel storage rack.

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