JP5701345B2 - Nuclear fuel storage rack connection structure and nuclear fuel storage rack connection method - Google Patents

Description

  The present invention relates to a nuclear fuel storage rack connection structure and a nuclear fuel storage rack connection method in which nuclear fuel assemblies are stored in water in a storage pit of a nuclear fuel storage facility.

  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. In addition, spent nuclear fuel is stored in a vertical cell of a fuel storage rack in a rectangular tube as a nuclear fuel assembly, and stored in a storage pit of a nuclear fuel storage facility. At this time, water is stored in the storage pit, and by storing the nuclear fuel storage rack (nuclear fuel assembly) containing the nuclear fuel assembly in water, the decay heat is cooled and removed and kept below the criticality. In addition, radiation is shielded.

  Furthermore, conventionally, the nuclear fuel storage rack is fixed to the side wall of the storage pit via a support and stored in a state of being supported by the support and the storage pit. However, when the nuclear fuel storage rack is fixed to the storage pit in this way, there is a possibility that the support load becomes large and the nuclear fuel storage rack cannot be supported in the event of a large earthquake.

  For this reason, a method of storing a nuclear fuel storage rack without fixing it to the side wall or bottom of the storage pit has been proposed and put into practical use (for example, see Patent Document 1). In this nuclear fuel storage facility, the nuclear fuel storage rack is slidably mounted on the bottom surface (bottom plate) of the storage pit (is slidably mounted by providing a sliding mechanism) and acts when an earthquake occurs. The horizontal force is absorbed by the sliding of the nuclear fuel storage rack with the fluid added damping effect of water.

  However, when the nuclear fuel storage rack is configured to slide in the event of an earthquake, that is, when the nuclear fuel storage rack is configured as a self-supporting rack, when a large earthquake occurs, the storage pit 2 as shown in FIG. Each of the nuclear fuel storage racks 1 stored in the storage unit 1 is locked, or a plurality of the nuclear fuel storage racks 1 stored in the storage pit 2 are individually slid, and the adjacent nuclear fuel storage racks 1 collide with each other in the storage pit 2. There was a risk. Further, there is a possibility that the nuclear fuel storage rack 1 may collide with the side wall or bottom surface of the storage pit 2 due to the locking.

  On the other hand, Patent Document 2 discloses a method of connecting adjacent nuclear fuel storage racks by pin-connecting connecting plates.

JP 63-128294 A JP-A-8-334596

  When the spent nuclear fuel is stored in the storage pit, the nuclear fuel storage rack is suspended in the storage pit and stored in the order in which the nuclear fuel assemblies are stored. At this time, a plurality of nuclear fuel storage racks are sequentially stored in the storage pit, and a new nuclear fuel storage rack is stored in an aligned manner next to the nuclear fuel storage rack previously stored in the storage pit. .

  In the method of connecting the nuclear fuel storage racks by pin-coupling the connection plates disclosed in Patent Document 2, a new nuclear fuel storage rack is hung next to the nuclear fuel storage rack previously stored. In the stage, it is necessary to pin the connecting plate by the operator. For this reason, there is a possibility that the dose equivalent to workers may increase. By connecting the nuclear fuel storage racks more easily and efficiently, the locking of the nuclear fuel storage racks in the event of a large earthquake occurs, and the nuclear fuel storage racks There has been a demand for a method for preventing the collision.

  In view of the above circumstances, the present invention provides a nuclear fuel storage rack connection structure and a nuclear fuel storage rack connection method that enable simple and efficient connection between nuclear fuel storage racks stored in water in a storage pit. The purpose is to provide.

  In order to achieve the above object, the present invention provides the following means.

The connection structure of the nuclear fuel storage rack according to the present invention is a connection of the nuclear fuel storage racks for connecting a plurality of nuclear fuel storage racks stored in alignment in the water in the storage pit in a state where the nuclear fuel assemblies are accommodated. In the structure, on the outer peripheral side of the nuclear fuel storage rack, an engagement receiving portion including at least an engagement hole or an engagement groove opened upward is provided, and the engagement member is vertically moved to the engagement reception portion. By inserting and engaging from the direction, the adjacent nuclear fuel storage racks are connected to each other, and each of the adjacent nuclear fuel storage racks is provided with the engagement receiving portion, and one nuclear fuel storage rack is provided. the one end to the engagement receiving portion, the other of the engagement receiving portion wherein the engaging member is engaged with the other end to the nuclear fuel storage rack is provided, the engaging member, the engaging Go受There are few engaging legs to engage Characterized in that it has two Kutomo.

  In the present invention, another nuclear fuel storage rack is suspended and aligned next to the nuclear fuel storage rack previously stored in the storage pit, and the engaging member is vertically arranged on the engagement receiving portion. By inserting and engaging, adjacent nuclear fuel storage racks can be connected to each other. For this reason, it is possible to connect the nuclear fuel storage racks adjacent to each other only by engaging the engaging member in the vertical direction with the engaging receiving portion without the complicated operation of pin-connecting the connecting plates as in the prior art. It becomes possible.

  In the present invention, the engagement member is attached so that one end side is engaged with the engagement receiving portion of one nuclear fuel storage rack and the other end side is engaged with the engagement receiving portion of the other nuclear fuel storage rack. That is, the adjacent nuclear fuels are attached by engaging both ends of the adjacent nuclear fuel storage racks by inserting both ends from the upper and lower directions and attaching the engaging members so as to cross over the adjacent nuclear fuel storage racks. It becomes possible to connect storage racks.

  Further, in the nuclear fuel storage rack connection structure of the present invention, the nuclear fuel storage rack is formed in a rectangular box shape, and the plurality of nuclear fuel storage racks are aligned and arranged so that the corner portions thereof are close to each other. The engagement member is formed with a plurality of engagement legs that are integrally connected at the upper end side and extend downward, and the engagement receiving portions of the nuclear fuel storage racks that are arranged with the corner portions close to each other. The engaging leg portion of the engaging member may be inserted into and engaged with each other, and the adjacent nuclear fuel storage racks may be connected.

  In the present invention, at the stage where a plurality of nuclear fuel storage racks are aligned and arranged so that the corner portions thereof are close to each other, the engagement leg portions of the engagement members are inserted into the respective engagement receiving portions of the adjacent nuclear fuel storage racks. By engaging with each other, adjacent nuclear fuel storage racks can be connected. In addition, for example, four nuclear fuel storage racks can be connected by using one engaging member.

  Further, in the nuclear fuel storage rack coupling structure of the present invention, the engagement hole or the engagement groove of the engagement receiving portion gradually increases in width from the laterally outer side to the inner side of the nuclear fuel storage rack. It is further preferable that the engaging member is formed to include an engaging part that is engaged with and engaged with the engaging part.

  In this invention, the engagement hole or the engagement groove of the engagement receiving portion is formed with the locking receiving portion whose width gradually increases from the laterally outer side to the inner side of the nuclear fuel storage rack. Since the member is provided with a locking portion that is locked by being engaged with the locking receiving portion, the engaging receiving portion and the locking receiving portion can be engaged with each other by engaging the locking receiving portion with the locking portion. The engaging member can be firmly coupled. This makes it possible to firmly connect adjacent nuclear fuel storage racks.

  In the nuclear fuel storage rack coupling structure of the present invention, the engagement hole or the engagement groove of the engagement receiving portion is formed with a tapered receiving portion whose width gradually decreases from the upper side to the lower side. More preferably, the engaging member is provided with a tapered portion that engages with the tapered receiving portion.

  In the present invention, the engagement hole or the engagement groove of the engagement receiving portion is formed with the taper receiving portion whose width gradually decreases from the upper side to the lower side, and the engaging member is engaged with the taper receiving portion. By being formed with a tapered portion that fits together, the engaging member can be easily inserted into the engaging receiving portion from above and below to be engaged.

  Furthermore, in the nuclear fuel storage rack connection structure of the present invention, it is more preferable that the nuclear fuel storage rack is provided with a plurality of the engagement receiving portions in the vertical direction.

  In the present invention, by providing a plurality of engagement receiving portions in the vertical direction, adjacent nuclear fuel storage racks can be connected at a plurality of locations in the vertical direction.

  A method for connecting a nuclear fuel storage rack according to the present invention is a method for connecting a plurality of nuclear fuel storage racks that are stored while being aligned and stored in water in a storage pit in a state in which the nuclear fuel assembly is housed. Any one of the above-mentioned nuclear fuel storage rack connection structures is used as a storage rack connection structure, and another nuclear fuel storage rack is hung next to the nuclear fuel storage rack previously stored in the storage pit. And the adjacent nuclear fuel storage racks are connected to each other by inserting and engaging the engaging member with the engaging receiving portion from above and below.

  In the present invention, it is possible to obtain the operational effects of the above-described nuclear fuel storage rack connection structure.

  According to the nuclear fuel storage rack connection structure and nuclear fuel storage rack connection method of the present invention, another nuclear fuel storage rack is suspended next to the nuclear fuel storage rack previously stored in the storage pit. It is possible to connect the adjacent nuclear fuel storage racks by arranging and arranging the engaging members into the engaging receiving portions from above and below to engage with each other.

  This prevents the nuclear fuel storage racks stored in the storage pits from locking in the event of a large earthquake, and the multiple nuclear fuel storage racks stored in the storage pits from sliding individually in response. It is possible to reliably prevent the adjacent nuclear fuel storage racks in the storage pit from colliding with each other. Further, by preventing locking of the nuclear fuel storage rack, it is possible to reliably prevent collision with the side wall or bottom surface of the storage pit.

  In addition, a new nuclear fuel storage rack is hung next to the nuclear fuel storage rack that has been stored in advance, and the adjacent nuclear fuel storage racks are connected by engaging the engagement receiving portion and the engagement member in the vertical direction. can do. For this reason, it is possible to connect the nuclear fuel storage racks adjacent to each other only by engaging the engaging member in the vertical direction with the engaging receiving portion without the complicated operation of pin-connecting the connecting plates as in the prior art. It becomes possible. Thereby, the nuclear fuel storage racks can be connected easily and efficiently, and the dose equivalent to the worker accompanying the connection work can be suppressed.

It is a figure which shows the storage pit of the nuclear fuel storage facility which stored the rack for nuclear fuel storage. It is a figure which shows the rack for nuclear fuel storage. It is a figure which shows the rack for nuclear fuel storage. It is a figure which shows the state which connected the nuclear fuel storage rack adjacent by the connection structure of the nuclear fuel storage rack which concerns on 1st Embodiment of this invention. It is a figure which shows the connection structure of the rack for nuclear fuel storage which concerns on 1st Embodiment of this invention. FIG. 6 is a view taken along line X1-X1 in FIG. 5. It is a figure which shows the connection method of the nuclear fuel storage rack which concerns on 1st Embodiment of this invention, and is a figure which shows the state which has suspended the nuclear fuel storage rack. It is a figure which shows the modification of the connection structure of the nuclear fuel storage rack which concerns on 1st Embodiment of this invention. It is a figure which shows the connection structure of the rack for nuclear fuel storage which concerns on 2nd Embodiment of this invention. It is a figure which shows the modification of the connection structure of the nuclear fuel storage rack which concerns on 2nd Embodiment of this invention. It is a figure which shows the modification of the connection structure of the nuclear fuel storage rack which concerns on 2nd Embodiment of this invention. It is a figure which shows the connection structure of the rack for nuclear fuel storage which concerns on 3rd Embodiment of this invention. It is a figure which shows the connection method of the nuclear fuel storage rack which concerns on 3rd Embodiment of this invention, and inserts the engagement leg part of an engagement member in the engagement hole of an engagement receiving part in FIG. FIG. It is a figure which shows the engagement receiving part of the connection structure of the nuclear fuel storage rack which concerns on 3rd Embodiment of this invention. It is a figure which shows the modification of the connection structure of the nuclear fuel storage rack which concerns on 3rd Embodiment of this invention. It is a figure which shows the method of connecting the nuclear fuel storage rack by the connection structure of the nuclear fuel storage rack of FIG. 15, and has engaged the engagement leg part of the engagement member by inserting it into the engagement hole of the engagement receiving part. It is a figure which shows a state. It is a figure which shows the example which divided the engagement member into 4 in FIG. It is a figure which shows the engagement receiving part of the connection structure of the nuclear fuel storage rack of FIG. It is a figure which shows the modification of the connection structure of the nuclear fuel storage rack which concerns on 3rd Embodiment of this invention. It is a figure which shows the method of connecting the nuclear fuel storage rack by the connection structure of the nuclear fuel storage rack of FIG. 19, and has engaged the engaging leg part of the engaging member by inserting it into the engaging hole of the engaging receiving part. It is a figure which shows a state. It is a figure which shows the engagement receiving part of the connection structure of the nuclear fuel storage rack of FIG. It is a figure which shows the modification of the connection structure of the nuclear fuel storage rack which concerns on 3rd Embodiment of this invention. It is a figure which shows the state which rocking occurred in the conventional nuclear fuel storage rack, and the adjacent nuclear fuel storage racks collided.

  Hereinafter, a nuclear fuel storage rack connection structure and a nuclear fuel storage rack connection method according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 7. The present embodiment relates to a nuclear fuel storage rack connection structure and a nuclear fuel storage rack connection method for storing and storing spent nuclear fuel generated in a nuclear power plant, for example, in water in a storage pit of a nuclear fuel storage facility. It is.

  As shown in FIG. 1, the nuclear fuel storage facility 3 of the present embodiment includes a storage pit 2 in which water is stored and a nuclear fuel storage rack A in which used nuclear fuel is stored as a nuclear fuel assembly is stored in water. In the storage pit 2, a plurality of nuclear fuel storage racks A are stored in alignment on the bottom surface 2 a of the storage pit 2.

  The nuclear fuel storage rack A for storing the nuclear fuel assembly is a self-supporting rack, and like the conventional nuclear fuel storage rack, as shown in FIGS. 1 and 2, the base plate 4 and the base plate 4 are connected at the upper end. And a plurality of support legs 6 provided on the lower surface of the base plate 4 and a cell storage portion 8 provided above the base plate 4 for receiving and holding a plurality of vertical cells (rack cells) 7. And is formed in a rectangular box shape. In addition, the cell storage unit 8 is erected with the lower end connected to the base plate 4, the four support columns 8 a provided on the four corner portions 5 side of the base plate 4, the upper ends of the adjacent support columns 8 a, and the intermediate portion The cross member is composed of a cross member (beam member) 8b constructed by connecting the bottom ends to each other, and an oblique member (stay) 8c provided in a plane surrounded by the support column 8a and the cross member 8b. As shown in FIG. 3, the nuclear fuel storage rack A may be configured by providing an outer peripheral plate 8d in a plane surrounded by a support column 8a and a cross member 8b.

  On the other hand, in the nuclear fuel storage rack A (A1, A2) of this embodiment, as shown in FIGS. 4 to 6, the outer peripheral portion of the nuclear fuel storage rack A (A1, A2) is provided on the outer peripheral side of the base plate 4. The nuclear fuel storage rack coupling structure 10 includes an engagement receiving portion 11 and an engagement member that engages with the engagement receiving portion 11 as shown in FIGS. 5 and 6. 12. In the present embodiment, the engaging member 12 is provided on the base plate 4 of one of the adjacent nuclear fuel storage racks A1 in a state in which the plurality of nuclear fuel storage racks A are aligned in the water in the storage pit 2, and the other An engagement receiving portion 11 is provided on the base plate 4 of the nuclear fuel storage rack A2.

  The engagement receiving portion 11 is an engagement hole, is recessed inward from the outer peripheral portion of the base plate 4, and penetrates from the upper surface 4 a to the lower surface 4 b of the base plate 4. That is, the engagement hole of the engagement receiving portion 11 is formed to open to the outer peripheral portion of the base plate 4 and to open upward and downward (upper surface 4a and lower surface 4b). Further, the engagement hole of the engagement receiving portion 11 gradually increases in width H1 as it goes inward from the outer peripheral side of the base plate 4 (as it goes from the outside in the lateral direction T1 of the nuclear fuel storage rack A1). The stopper portion 11a is provided. Also, as shown in FIG. 6, the base plate 4 is formed with a taper receiving portion 11b whose width H1 gradually decreases from the upper surface 4a to the lower surface 4b (from the upper side to the lower side).

  On the other hand, as shown in FIGS. 5 and 6, the engaging member 12 is formed in the same shape and size as the engaging hole of the engaging receiving portion 11, and one end is fixed to the outer peripheral portion of the base plate 4 in the lateral direction T <b> 1. Projected outward. That is, the engaging member 12 of the present embodiment is integrally formed with one nuclear fuel storage rack A1, and the engaging portion 12a whose width H2 gradually increases from the outer peripheral side of the base plate 4 toward the tip side. It is formed with. The engaging member 12 is formed with a tapered portion 12b whose width H2 gradually decreases from the upper surface 4a to the lower surface 4b (from the upper side to the lower side), and the tapered portion 12b is an engagement receiving portion. 11 taper receiving portions 11b.

  Next, when the adjacent nuclear fuel storage racks A (A1, A2) are connected to each other by the nuclear fuel storage rack connection structure 10 of the present embodiment having the above-described configuration (the nuclear fuel storage rack of the present embodiment). As shown in FIG. 7, a new nuclear fuel storage rack (one of the nuclear fuel storage racks) A2 is stored next to the nuclear fuel storage rack (the other nuclear fuel storage rack) A2 previously stored in the storage pit 2, as shown in FIG. Nuclear fuel storage racks and other nuclear fuel storage racks) A1 are suspended and aligned. At this time, one nuclear fuel storage rack A1 is suspended and aligned (at the same time), and as shown in FIGS. 4 to 5, one of the nuclear fuel storage racks A2 receives the one nuclear fuel storage rack 11 as shown in FIGS. The engagement member 12 of the rack A1 is inserted and engaged from above (in the vertical direction T2). Thereby, the adjacent nuclear fuel storage racks A <b> 1 and A <b> 2 are connected to each other by the engagement member 12 engaged with the engagement receiving portion 11. That is, by providing the nuclear fuel storage racks A1 and A2 with the puzzle structure connection structure 10 in which the engagement members 12 are inserted into the engagement holes of the engagement receiving portions 11 and engaged with each other, the adjacent nuclear fuel storage racks A1 and A2 are provided. A2 is connected. Note that when the nuclear fuel assembly is stored in the water of the storage pit 2 and the water temperature rises, the engagement member 12 is thermally stretched, and the adjacent nuclear fuel storage racks A1 and A2 are firmly connected to each other.

  And, since the nuclear fuel storage rack A1 is suspended and aligned, the adjacent nuclear fuel storage racks A1 and A2 are connected to each other, so that the troublesome work of pin-connecting the connecting plates as in the prior art is unnecessary, The nuclear fuel storage racks A1 and A2 are simply and efficiently connected to each other simply by engaging the engagement member 12 with the engagement receiving portion 11 from the vertical direction T2 (just by hanging the nuclear fuel storage rack A1). The For this reason, the increase of the dose equivalent to the worker accompanying a connection operation | work can be suppressed.

  Further, at this time, the taper receiving portion 11b whose width H1 gradually decreases from the upper surface 4a to the lower surface 4b of the base plate 4 is provided in the engagement receiving portion 11, and the taper portion 12b is provided in the engaging member 12. Therefore, the nuclear fuel storage rack A1 is suspended and aligned, and at the same time, the engaging member 12 is easily engaged with the engagement receiving portion 11, and the nuclear fuel storage racks A1 and A2 are more easily and efficiently connected to each other. Can be connected.

  Since the nuclear fuel storage racks A1 and A2 adjacent to each other are engaged with the engagement receiving portion 11 and connected to each other, the nuclear fuel storages stored in the storage pit 2 when a large earthquake occurs are stored. The rack A can be prevented from being locked, and the nuclear fuel storage racks A stored in the storage pit 2 can be prevented from sliding in response to each individually. For this reason, the nuclear fuel storage racks A (A1, A2) adjacent in the storage pit 2 do not collide with each other. Further, by preventing locking of the nuclear fuel storage racks A (A1, A2), the nuclear fuel storage rack A does not collide with the side wall 2b of the storage pit 2 (see FIG. 1).

  Further, as in the present embodiment, a locking receiving portion 11a whose width H1 gradually increases from the outer peripheral side of the base plate 4 toward the inside is provided in the engaging receiving portion 11, and the locking receiving portion 11a includes Since the engaging member 12 is provided with the engaging portion 12a to be engaged and locked, the engaging member 12 is securely engaged with and engaged with the engaging receiving portion 11 for adjacent nuclear fuel storage. The racks A1 and A2 are firmly connected to each other. For this reason, it is possible to prevent the nuclear fuel storage rack A from being locked, and to prevent the nuclear fuel storage rack A from sliding individually in response.

  Therefore, in the nuclear fuel storage rack connection structure 10 and the nuclear fuel storage rack connection method according to the present embodiment, the nuclear fuel storage rack A2 stored in the storage pit 2 is placed next to another nuclear fuel storage rack. The rack A1 can be suspended and aligned, and the engaging member 12 can be inserted into the engagement receiving portion 11 from the vertical direction T2 and engaged to connect adjacent nuclear fuel storage racks A1 and A2. Become.

  In addition, the engaging member is fixed to one end of the outer periphery of the nuclear fuel storage rack and protrudes outward in the lateral direction, and is integrally formed with the nuclear fuel storage rack in advance, so that it is stored in the storage pit in advance. Next to the nuclear fuel storage rack, other nuclear fuel storage racks are suspended and aligned, and at the same time, engaging members are inserted into the engagement receiving portions from above and below to engage with each other. It becomes possible to connect. Furthermore, since the engagement receiving portion and the engagement member have a simple configuration, it is possible to easily provide the engagement reception portion and the engagement member by processing an existing nuclear fuel storage rack.

  Accordingly, when a large earthquake occurs, each nuclear fuel storage rack A stored in the storage pit 2 is locked, or a plurality of nuclear fuel storage racks A stored in the storage pit 2 are individually slid in response. Can be prevented. Therefore, the nuclear fuel storage racks A (A1, A2) adjacent in the storage pit 2 can be reliably prevented from colliding with each other. Further, by preventing the nuclear fuel storage rack A (A1, A2) from being locked, it is possible to reliably prevent the storage fuel pit 2 from colliding with the side wall or the bottom surface.

  Further, the conventional troublesome operation of pin-connecting the connecting plates is not required, and the adjacent nuclear fuel storage racks A (A1, A,. A2) It becomes possible to connect each other. Thereby, the nuclear fuel storage racks A (A1, A2) can be easily and efficiently connected to each other, and the dose equivalent to workers associated with the connection work can be suppressed.

  Furthermore, the engagement hole of the engagement receiving part 11 is formed with a locking receiving part 11a whose width H1 gradually increases from the outside in the lateral direction T1 of the nuclear fuel storage rack A2 toward the inside. Is formed with a locking portion 12a that engages and locks with the locking receiving portion 11a, thereby engaging the locking receiving portion 11a and the locking portion 12a with each other. The receiving portion 11 and the engaging member 12 can be firmly coupled. This makes it possible to firmly connect adjacent nuclear fuel storage racks A (A1, A2).

  Further, the engagement hole of the engagement receiving part 11 is formed with a taper receiving part 11b whose width H1 gradually decreases from the upper side to the lower side, and the engaging member 12 engages with the taper receiving part 11b. Since the taper portion 12b is formed, the engagement member 12 can be easily inserted into the engagement receiving portion 11 from the vertical direction T2 and engaged therewith.

  If necessary, the engagement state of the engagement member 12 and the engagement receiving portion 11 can be easily released by lifting the nuclear fuel storage rack A1 from the state in which the nuclear fuel storage racks A (A1, A2) are connected. It is also possible to easily release the connected state of the adjacent nuclear fuel storage racks A (A1, A2).

  The first embodiment of the nuclear fuel storage rack connection structure and the nuclear fuel storage rack connection method according to the present invention has been described above, but the present invention is not limited to the first embodiment described above, and the gist thereof is described. It is possible to make appropriate changes without departing from For example, in the present embodiment, the engagement receiving portion 11 is provided in the nuclear fuel storage rack A2 previously stored in the storage pit 2, and the nuclear fuel storage rack A1 is newly suspended and stored in the storage pit 2. The joint member 12 is integrally formed, but the engaging member 12 is integrally formed on the nuclear fuel storage rack A2 stored in advance, and the newly suspended nuclear fuel storage rack A1 is provided. The engagement receiving part 11 may be provided.

  Further, it is only necessary that the nuclear fuel storage racks A1 and A2 can be connected to each other by engaging the engagement receiving portion 11 and the engaging member 12, and therefore, each of the nuclear fuel storage racks A (A1 and A2) is connected to the engagement receiving portion 11. And the engaging member 12 may be provided, and the pair of engaging receiving portions 11 and the engaging member 12 of the adjacent nuclear fuel storage racks A1 and A2 may be engaged and connected. Further, a plurality of engagement receiving portions 11 and / or engagement members 12 may be provided in each nuclear fuel storage rack A. In FIG. 5, only the connecting structure in the horizontal direction in the figure has been described, but all the nuclear fuels can be connected by connecting the nuclear fuel storage racks A1 and A2 in the front-rear direction (right and left orthogonal directions) by the same mechanism. Storage racks A can be connected.

  Further, the nuclear fuel storage rack connection structure of the present invention (and the nuclear fuel storage rack connection method) is a new nuclear fuel storage rack beside the nuclear fuel storage rack A2 previously stored in the water of the storage pit 2. This is not only applied when A1 is arranged and arranged, but can also be applied when storing a plurality of nuclear fuel storage racks A in the storage pit 2 in a state where water is not stored.

  Furthermore, in this embodiment, the engaging member 12 is fixed to one end of the outer peripheral portion of the base plate 4 and protrudes outward in the lateral direction T1, but as shown in FIG. 8, one nuclear fuel storage rack is provided. A1 and the other nuclear fuel storage rack A2 are each provided with an engagement receiving portion 11, one end is connected to the engagement receiving portion 11 of one nuclear fuel storage rack A1, and the other end is connected to the other nuclear fuel storage rack A2. You may make it connect the adjacent nuclear fuel storage racks A1 and A2 by engaging with the joint part 11 and attaching the engaging member 12, respectively. That is, the engagement member 12 is inserted and engaged with the engagement receiving portions 11 of the adjacent nuclear fuel storage racks A1 and A2 from both ends in the vertical direction T2 so as to be bridged between the adjacent nuclear fuel storage racks A1 and A2. And the adjacent nuclear fuel storage racks A1 and A2 may be connected. Even in this case, the same effect as that of the present embodiment can be obtained by providing the engagement receiving portion 11 and the engagement member 12 with the engagement receiving portion 11a, the engagement portion 12a, the taper receiving portion 11b, and the taper portion 12b. It is possible to obtain Furthermore, if the engaging member 12 is formed to be extendable and retractable, it is possible to more easily engage with the engagement receiving portion 11 (connection between adjacent nuclear fuel storage racks A1 and A2).

  Next, a nuclear fuel storage rack connection structure and a nuclear fuel storage rack connection method according to a second embodiment of the present invention will be described with reference to FIG. In the present embodiment, as in the first embodiment, an engagement member is provided on the base plate of one adjacent nuclear fuel storage rack, an engagement receiving portion is provided on the base plate of the other nuclear fuel storage rack, and the engagement member is engaged. The present invention relates to a nuclear fuel storage rack connection structure that connects adjacent nuclear fuel storage racks by being inserted and engaged with each other and a method for connecting the nuclear fuel storage racks. Accordingly, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the nuclear fuel storage rack connection structure 20 of the present embodiment, as shown in FIG. 9, the engagement receiving portion 21 and the engagement member 22 are each formed (configured) using a U-shaped member. In the engagement receiving portion 21, an engagement groove formed by a pair of left and right side wall portions 21a having a U-shaped cross section is disposed in the lateral direction T1 along the outer peripheral portion of the base plate 4 (nuclear fuel storage rack A2). In this manner, the base plate 4 is fixed to the outer peripheral portion. At this time, the engagement receiving portion 21 is fixed to the base plate 4 so that the opening between the ends of the pair of left and right side wall portions 21a of the engagement groove is disposed upward.

  On the other hand, the engaging member 22 is provided such that one side wall portion 22a is fixed to the base plate 4 and an end portion of the other side wall portion 22a is arranged below. That is, the engagement member 22 and the engagement receiving portion 11 are disposed upside down.

  When the adjacent nuclear fuel storage racks A1 and A2 are connected to each other by the nuclear fuel storage rack connecting structure 20 having the above-described configuration, the nuclear fuel storage previously stored in the storage pit 2 is performed. Next, a new nuclear fuel storage rack (one nuclear fuel storage rack, another nuclear fuel storage rack) A1 is suspended and aligned next to the rack (the other nuclear fuel storage rack) A2. ) Insert the other side wall portion 22a of the engagement member 12 of one nuclear fuel storage rack A1 into the engagement groove of the engagement receiving portion 21 of the other nuclear fuel storage rack A2 from above (in the vertical direction T2). Engage. Thereby, the adjacent nuclear fuel storage racks A <b> 1 and A <b> 2 are connected by the engaging member 22 engaged with the engagement receiving portion 21. In addition, the connection structure 20 is fixed in the direction of east, west, south, and north in FIG. 1 and connects all the nuclear fuel storage racks A.

  In this manner, the nuclear fuel storage rack A1 is suspended and aligned, and at the same time, the adjacent nuclear fuel storage racks A1 and A2 are connected. No work is required, and the engagement member 22 is simply engaged with the engagement receiving portion 21 from the vertical direction T2 (just by hanging the nuclear fuel storage rack A1), and the nuclear fuel storage rack A1, A2 are connected to each other. For this reason, the dose equivalent to the worker accompanying connection work can be controlled.

  Further, since the adjacent nuclear fuel storage racks A1 and A2 are connected by the engagement member 22 engaging with the engagement receiving portion 21, each nuclear fuel storage rack stored in the storage pit 2 when a large earthquake occurs. A is prevented from being locked, and the nuclear fuel storage racks A are prevented from sliding individually in response. For this reason, the nuclear fuel storage racks A (A1, A2) adjacent in the storage pit 2 do not collide with each other. Further, by preventing the nuclear fuel storage rack A (A1, A2) from locking, the nuclear fuel storage rack A will not collide with the side wall 2b of the storage pit 2.

  Therefore, in the nuclear fuel storage rack connection structure 20 and the nuclear fuel storage rack connection method of this embodiment, the same effects as those of the first embodiment can be obtained, and the nuclear fuel storage rack is stored in the storage pit 2 in advance. Next, the other nuclear fuel storage rack A1 is suspended and aligned next to the nuclear fuel storage rack A2, and at the same time, the engaging member 22 is inserted into the engagement receiving portion 21 from the vertical direction T2 to be engaged and adjacent to each other. It becomes possible to connect the nuclear fuel storage racks A (A1, A2).

  Accordingly, when a large earthquake occurs, each nuclear fuel storage rack A stored in the storage pit 2 is locked, or a plurality of nuclear fuel storage racks A stored in the storage pit 2 are individually slid in response. It is possible to prevent the nuclear fuel storage racks A (A1, A2) adjacent in the storage pit 2 from colliding with each other. Further, by preventing the nuclear fuel storage rack A (A1, A2) from being locked, it is possible to reliably prevent the storage fuel pit 2 from colliding with the side wall or the bottom surface.

  In addition, the conventional troublesome work of pin-connecting the connecting plates is not required, and the adjacent nuclear fuel storage racks A1 and A2 can be connected to each other only by engaging the engagement member 22 with the engagement receiving portion 21 from the vertical direction T2. Can be connected. Thereby, the nuclear fuel storage racks A (A1, A2) can be easily and efficiently connected to each other, and the dose equivalent to workers associated with the connection work can be suppressed.

  If necessary, from the state where the nuclear fuel storage racks A (A1, A2) are connected, one of the nuclear fuel storage racks A1 is lifted to easily change the engagement state of the engagement member 22 and the engagement receiving portion 21. It is possible to cancel the connection state between the adjacent nuclear fuel storage racks A (A1, A2).

The second embodiment of the nuclear fuel storage rack connection structure and the nuclear fuel storage rack connection method according to the present invention has been described above. However, the present invention is not limited to the second embodiment, and the first embodiment Various modifications can be made as appropriate without departing from the spirit of the embodiment, including modification examples.
For example, as shown in FIG. 10, the engagement receiving part 21 and the engagement member 22 may be formed using a cross-sectional L-shaped member. Further, a taper receiving portion 21b whose width gradually decreases from the top to the bottom is formed to form an engagement groove of the engagement receiving portion 21, and a taper portion 22b that engages with the taper receiving portion 21b is provided. The engaging member 22 may be formed. With this configuration, the engagement member 22 can be easily inserted into the engagement receiving portion 21 from the vertical direction T2 and engaged as in the first embodiment.

  In addition, as shown in FIG. 11, the engagement receiving portions 21 are extended outwardly along the outer peripheral portions facing each other (the base plates 4 of the nuclear fuel storage racks A1 and A2) to the adjacent nuclear fuel storage racks A1 and A2. The engaging member 22 formed in a U-shaped cross-section is inserted into the engagement receiving portion 21 of the adjacent nuclear fuel storage racks A1 and A2 from above to be engaged, and the adjacent nuclear fuel storage rack A ( A1, A2) may be connected to each other. Although illustration is omitted, similar to the engagement receiving portion 31 of FIG. 20, an engagement hole may be provided in the engagement receiving portion 21, and the distal end of the engagement member 22 may be inserted and engaged therewith. In these cases, the same effects as those of the first and second embodiments can be obtained.

  Next, a nuclear fuel storage rack connection structure and a nuclear fuel storage rack connection method according to a third embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the same components as those in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the nuclear fuel storage rack connection structure 30 of this embodiment, as shown in FIGS. 12 to 14, the engagement receiving portion 31 is formed using a member having a square cross section (or a member having a U-shaped cross section) ( It is configured. And the engagement receiving part 31 connects the edge part of a pair of left-right side wall part of a cross-sectionally R-shaped member to the outer peripheral part of the rack A for nuclear fuel storage (the base plate 4, the support | pillar 8a of the cell storage part 8, and the cross member 8b). Are fixed. At this time, the engagement receiving portion 31 is fixed so that the engagement holes are arranged in the vertical direction T2. Further, in the present embodiment, such an engagement receiving part 31 is provided in a plurality of stages (two stages in the present embodiment) in the vertical direction T2 of the nuclear fuel storage rack A, and the upper and lower engagement receiving parts 31 are arranged vertically. It is provided so as to overlap in the direction T2.

  On the other hand, the engagement member 32 is formed in a cross shape with four engagement leg portions 32a that are integrally connected at the upper end side and extend downward.

  Then, when the adjacent nuclear fuel storage racks A are connected by the nuclear fuel storage rack connection structure 30 of the present embodiment having the above-described configuration, the nuclear fuel storage rack previously stored in the storage pit 2 is connected. Next to A, a new nuclear fuel storage rack A is suspended and aligned. At this time, the four nuclear fuel storage racks A (A1 to A4) are arranged in alignment with the corner portions 5 being close to each other. The four nuclear fuel storage racks A (A1 to A4) are arranged and arranged in this way, and the engagement members 32 of the upper and lower pair of engagement receiving portions 31 of the nuclear fuel storage racks A are respectively arranged. The engaging leg 32a is inserted from above (in the vertical direction T2) and engaged. Thereby, the adjacent nuclear fuel storage racks (four adjacent nuclear fuel storage racks A (A1 to A4)) are connected by the engaging member 32 engaged with the engagement receiving portion 31.

  Since the nuclear fuel storage rack A is suspended and arranged in this manner and the engaging member 32 is inserted into the engagement hole from above, the adjacent nuclear fuel storage racks A (A1 to A4) are connected. And like 2nd Embodiment, the complicated operation | work which pin-connects a connection board like the past is unnecessary, and it is simple and efficient only by engaging the engagement member 32 to the engagement receiving part 31 from the up-down direction T2. In particular, the nuclear fuel storage racks A (A1 to A4) are connected to each other. For this reason, the dose equivalent to the worker accompanying connection work can be controlled.

  In addition, since the engaging member 32 is engaged with the engaging receiving portion 31 and the adjacent nuclear fuel storage racks A (A1 to A4) are connected, they are stored in the storage pit 2 when a large earthquake occurs. It is possible to prevent the nuclear fuel storage racks A (A1 to A4) from being locked, and the nuclear fuel storage racks A (A1 to A4) to slide individually in response. For this reason, the nuclear fuel storage racks A (A1 to A4) adjacent in the storage pit 2 do not collide with each other. Further, by preventing the nuclear fuel storage rack A (A1 to A4) from being locked, the nuclear fuel storage rack A does not collide with the side wall 2b of the storage pit 2.

  Therefore, in the nuclear fuel storage rack connection structure 30 and the nuclear fuel storage rack connection method of the present embodiment, the same operational effects as those of the first and second embodiments can be obtained, and the interior of the storage pit 2 is preceded. Next, the other nuclear fuel storage rack A is suspended and aligned next to the nuclear fuel storage rack A stored in the above, and the engagement member 32 is inserted into the engagement receiving portion 31 from the vertical direction T2 and engaged. Adjacent nuclear fuel storage racks A (A1 to A4) can be connected to each other.

  As a result, when a large earthquake occurs, the nuclear fuel storage racks A (A1 to A4) stored in the storage pit 2 are locked or a plurality of nuclear fuel storage racks A (A1 to A4) respond individually. Thus, the nuclear fuel storage racks A (A1 to A4) adjacent in the storage pit 2 can be reliably prevented from colliding with each other. Further, by preventing locking of the nuclear fuel storage racks A (A1 to A4), it is possible to reliably prevent collision with the side walls and bottom surface of the storage pit 2.

  Further, the conventional troublesome operation of pin-coupling the connecting plates is not required, and the engaging member 31 is simply engaged with the engaging member 32 from the vertical direction T2, so that the adjacent nuclear fuel storage racks A (A1 to A1) are connected. A4) It becomes possible to connect each other. Thereby, the nuclear fuel storage racks A (A1 to A4) can be easily and efficiently connected to each other, and the dose equivalent to the worker accompanying the connection work can be suppressed.

  Further, four nuclear fuel storage racks A (A1 to A4) are inserted by engaging one engagement member 32 into the engagement receiving portion 31 of each nuclear fuel storage rack A (A1 to A4) from above. Can be linked at once. If necessary, the nuclear fuel storage racks A (A1 to A4) can be easily connected to each other by pulling out the engagement leg portions 32a of the engagement members 32 from the engagement receiving portions 31. It is also possible to release the connected state of A (A1 to A4).

  Furthermore, by providing a plurality of stages of the engagement receiving portions 31 in the vertical direction T2, it becomes possible to connect the adjacent nuclear fuel storage racks A (A1 to A4) at a plurality of locations in the vertical direction T2. It becomes possible to strongly connect the nuclear fuel storage racks A (A1 to A4) adjacent to each other.

  The third embodiment of the nuclear fuel storage rack connection structure and the nuclear fuel storage rack connection method according to the present invention has been described above. However, the present invention is not limited to the third embodiment, and the first embodiment And it can change suitably in the range which does not deviate from the meaning including the example of a change of 2nd Embodiment. For example, in the present embodiment, the engagement member 32 is formed to include four engagement leg portions 32a, but it is not necessary to limit the number of engagement leg portions 32a. For example, as shown in FIGS. 15, 16, and 18, two engagement leg portions (a total of eight engagement leg portions) 32 a are provided in each direction (four directions) of the cross-shaped engagement member 32. The engaging member 32 may be formed. In this case, the engagement receiving portions 31 into which the respective engagement leg portions 32a are inserted and engaged from above are provided in the nuclear fuel storage racks A (A1 to A4) (engagement reception portions 31). Are provided in each stage of each nuclear fuel storage rack A (A1 to A2), so that adjacent nuclear fuel storage racks A (A1 to A4) can be connected to each other. As described above, by forming the engagement member 32 with more engagement legs 32a than in the present embodiment, the nuclear fuel storage racks A (A1 to A4) can be more firmly connected to each other.

  Further, as shown in FIG. 19 to FIG. 21, the engaging member 32 may be inserted into the engaging receiving portion 31 and engaged with each other as shown in FIG. It is possible to connect A (A1 to A4) more firmly. In this case, as shown in FIGS. 19 and 21, the lower engagement receiving portion 31 (31a) with which the engagement leg portion 32a of the lower engagement member 32 (32b) is engaged is connected to the upper engagement member 32 (32b). The lower engaging member 32 is shifted to the outside with respect to the corner portion 5 that is closer to each other than the upper engaging receiving portion 31 (31b) with which the engaging leg portion 32a of the coupling member 32 (32c) is engaged. (32b) can be inserted and engaged in the vertical direction T2. Furthermore, as shown in FIG. 17, the engaging member 32d of FIG. 16 may be divided into four engaging members 32d.

  Further, when measures for preventing exposure to workers are taken, as shown in FIG. 22, an engagement receiving portion 31 and an engagement member 32 (engagement hole) engaged with the engagement reception portion 31 are provided. The engaging legs 32a) inserted and engaged with each other may be fixed with bolts 33 such as push bolts.

  Finally, the nuclear fuel storage racks A, 20 and 30 shown in the first to third embodiments may be selectively used together so that adjacent nuclear fuel storage racks A are connected.

1 Conventional nuclear fuel storage rack 2 Storage pit 2a Bottom (bottom)
2b Side wall 3 Nuclear fuel storage facility 4 Base plate 4a Upper surface 4b Lower surface 5 Corner portion 6 Supporting leg portion 7 Vertical cell (rack cell)
8 Cell storage portion 8a Post 8b Cross member 8c Diagonal material (stay)
8d Peripheral plate 10 Nuclear fuel storage rack connection structure 11 Engagement receiving portion 11a Locking reception portion 11b Taper receiving portion 12 Engagement member 12a Locking portion 12b Taper portion 20 Nuclear fuel storage rack connection structure 21 Engagement reception portion 21a Side wall portion 22 Engagement member 22a Side wall portion 30 Nuclear fuel storage rack connection structure 31 Engagement receiving portion 31a Lower engagement receiving portion 31b Upper engagement receiving portion 32 Engaging member 32a Engaging leg portion 32b Lower engaging member 32c Upper engaging member 32d Engaging member 33 Bolt A Nuclear fuel storage rack A1 Nuclear fuel storage rack (one nuclear fuel storage rack, the other nuclear fuel storage rack)
A2 Nuclear fuel storage rack (the other nuclear fuel storage rack)
A3 Nuclear fuel storage rack A4 Nuclear fuel storage rack H1 Width H2 Width T1 Horizontal direction T2 Vertical direction

Claims (6)

A connection structure of nuclear fuel storage racks for connecting a plurality of nuclear fuel storage racks stored in alignment in water in a storage pit in a state where the nuclear fuel assemblies are housed,
On the outer peripheral side of the nuclear fuel storage rack, an engagement receiving portion including at least an engagement hole or an engagement groove opened upward is provided.
It is configured to connect adjacent nuclear fuel storage racks by inserting and engaging the engaging member into the engagement receiving portion from above and below,
The engagement receiving portion is provided in each of the adjacent nuclear fuel storage racks,
The engagement member is provided by engaging one end side with the engagement receiving portion of one nuclear fuel storage rack and the other end side with the engagement receiving portion of the other nuclear fuel storage rack ,
The coupling structure for a nuclear fuel storage rack , wherein the engagement member has at least two engagement leg portions that engage with the engagement receiving portion . The connection structure of the nuclear fuel storage rack according to claim 1,
The nuclear fuel storage rack is formed in a rectangular box shape,
The plurality of nuclear fuel storage racks are aligned so that the corners of each rack are close to each other,
The engaging member is formed with a plurality of engaging legs that are integrally connected at the upper end side and extend downward,
The engaging leg portions of the engaging members are inserted and engaged with the engaging receiving portions of the nuclear fuel storage racks arranged with the corner portions close to each other, and the adjacent nuclear fuel storage racks are connected. A structure for connecting nuclear fuel storage racks, characterized in that: In the connection structure of the nuclear fuel storage rack according to any one of claims 1 to 2,
The engagement hole or the engagement groove of the engagement receiving portion is formed with a locking receiving portion whose width gradually increases from the lateral outer side to the inner side of the nuclear fuel storage rack,
The coupling structure for a nuclear fuel storage rack, wherein the engaging member is formed with a locking portion that is locked by being engaged with the locking receiving portion. In the connection structure of the nuclear fuel storage rack according to any one of claims 1 to 3,
The engagement hole or the engagement groove of the engagement receiving portion is formed with a tapered receiving portion whose width gradually decreases from the upper side to the lower side,
The connection structure for a nuclear fuel storage rack, wherein the engaging member is formed with a tapered portion that engages with the tapered receiving portion. In the connection structure of the nuclear fuel storage rack according to any one of claims 1 to 4,
The nuclear fuel storage rack connection structure, wherein the nuclear fuel storage rack is provided with a plurality of engagement receiving portions in the vertical direction. A method of connecting a plurality of nuclear fuel storage racks arranged and stored in water in a storage pit in a state in which a nuclear fuel assembly is stored,
The connection structure of the nuclear fuel storage rack according to any one of claims 1 to 5 is used as a connection structure of the plurality of nuclear fuel storage racks,
Next to the nuclear fuel storage rack previously stored in the storage pit, another nuclear fuel storage rack is suspended and aligned, and the engagement member is inserted into the engagement receiving portion from above and below. The nuclear fuel storage racks are connected to each other by connecting the adjacent racks for nuclear fuel storage.

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