JP2011149904A - Rack for storing nuclear fuel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rack for storing nuclear fuel which achieves the prevention of the collision of the racks for storing nuclear fuel with each other and the collision of the racks for storing nuclear fuel with side walls of a storage pit by preventing (suppressing) locking from occurring in case of an earthquake. <P>SOLUTION: The rack B for storing nuclear fuel stored by aligning the rack B in water in a storage pit 3 with the racks B accommodating nuclear fuel assemblies includes a base plate 4, a cell housing 6 placed on the base plate 4 to house and hold rack cells 1 accommodating the nuclear fuel assemblies, supporting legs 5 whose upper ends are connected to the base plate 4 and formed so as to protrude downward and a locking suppression mechanism 7 which suppresses the locking of the rack B for storing the nuclear fuel by generating the fluid resistance of the water in the storage pit 3 when the rack B for storing the nuclear fuel receives a horizontal force and is made to act by the overturning moment. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a nuclear fuel storage rack that is stored in a storage pit of a nuclear fuel storage facility in a state in which a nuclear fuel assembly is housed, and in particular, includes a locking suppression mechanism that suppresses (prevents) locking of the nuclear fuel storage rack. The present invention relates to a nuclear fuel storage rack.

  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. 12, the spent nuclear fuel is stored in a vertical cell (rack cell) 1 of a 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. At this time, water is stored in the storage pit 3, and a plurality of nuclear fuel storage racks A (nuclear fuel assemblies) are arranged and stored in the water so that the decay heat is cooled and removed below the criticality. It holds and shields radiation.

  Furthermore, conventionally, the nuclear fuel storage rack A is fixed to the side wall 3a of the storage pit 3 via a support and stored in a state supported by the support and the storage pit 3. However, when the nuclear fuel storage rack A is fixed to the storage pit 3 in this way, it is possible to obtain a seismic isolation effect to some extent by the effect of adding water to the fluid when an earthquake occurs. May increase and may not be able to support the nuclear fuel storage rack A.

  For this reason, a method 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 (see, for example, Patent Document 1). In the nuclear fuel storage facility 2 in which the nuclear fuel storage rack A is stored without being fixed to the side wall 3a or the bottom plate 3b of the storage pit 3, the nuclear fuel storage rack A can slide relative to the bottom surface (bottom plate) 3b of the storage pit 3. The horizontal force acting upon the occurrence of an earthquake is absorbed by the sliding of the nuclear fuel storage rack A together with the fluid added damping effect of water.

  When the nuclear fuel storage rack A is configured to slide in the event of 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. 14, the base plate 4, four support legs 5 projecting downward with the upper ends connected to the four corners of the base plate 4, and a plurality of vertical cells ( The rack cell) 1 is provided with a cell storage portion 6 that accommodates and holds it, and is formed in a substantially rectangular box shape. The cell storage unit 6 is formed by assembling a column 6a, a cross member 6b, and a diagonal member (stay) 6c as shown in FIG. 13, 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.

JP 2002-70945 A

  However, when the nuclear fuel storage rack A is configured to slide during an earthquake, when a large earthquake occurs, the nuclear fuel storage rack A stored in the storage pit 3 is locked as shown in FIG. In the pit 3, adjacent nuclear fuel storage racks A may collide with each other.

  In view of the above circumstances, an object of the present invention is to provide a nuclear fuel storage rack capable of preventing (suppressing) rocking from occurring during an earthquake and preventing collision between the nuclear fuel storage racks. .

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

  The nuclear fuel storage rack of the present invention is a nuclear fuel storage rack that is stored in an aligned arrangement in the water in a storage pit in a state in which a nuclear fuel assembly is housed, and is provided on the base plate and the nuclear fuel. A cell storage unit that stores and holds a plurality of rack cells that accommodate the assembly, and a plurality of support legs that project downward from the base plate with upper ends connected thereto, and receives a horizontal force to store the nuclear fuel. A rocking deterrent mechanism is provided that generates a fluid resistance of water in the storage pit when a tipping moment acts on the rack to deter the rocking of the nuclear fuel storage rack.

  In the present invention, when a falling moment acts on the nuclear fuel storage rack due to a horizontal force during an earthquake (when the nuclear fuel storage rack swings due to a horizontal force), the fluid resistance of the water in the storage pit is caused by the locking suppression mechanism. Therefore, rocking can be suppressed by this fluid resistance.

  Further, in the nuclear fuel storage rack according to the present invention, the locking restraining mechanism is supported by being connected to the base plate, and is disposed between the base plate and the lower end of the support leg portion in the vertical direction and extends in the lateral direction. It is desirable that the resistor plate is provided.

  In the present invention, when a tipping moment acts on the nuclear fuel storage rack, a fluid resistance is generated between the resistance plate and the bottom surface of the storage pit where the lower end (lower surface) of the support leg abuts, that is, the resistance plate and the storage plate. It becomes possible to generate a negative pressure between the bottom surfaces of the pits to suppress rocking.

  Furthermore, in the nuclear fuel storage rack of the present invention, the locking restraining mechanism may be configured to include a resistance plate provided so as to extend a lower end of the support leg portion outward in the lateral direction.

  In the present invention, since the resistance plate is provided so as to extend the lower end (lower surface) of the support leg portion in contact with the bottom surface of the storage pit outward in the lateral direction, when a tipping moment acts on the nuclear fuel storage rack, Rock resistance can be suppressed by generating a fluid resistance between the resistance plate and the bottom surface of the storage pit where the lower end of the support leg abuts (by creating a negative pressure between the resistance plate and the bottom surface of the storage pit). become.

  Further, in the nuclear fuel storage rack of the present invention, the locking restraining mechanism is supported by connecting one end to the cell storage portion and extending upward with a gap in the lateral direction from the outer surface of the cell storage portion. You may be provided with the board.

  In the present invention, since a resistance plate extending upward with a gap between the cell storage portion is provided, the resistance plates of adjacent nuclear fuel storage racks are opposed to each other and stored in the storage pit. By keeping the gap between the resistance plates as small as possible and storing the adjacent nuclear fuel storage racks, if a tipping moment acts on the nuclear fuel storage racks, fluid resistance is generated between the resistance plates and locking is suppressed. It becomes possible to do. In addition, when the nuclear fuel storage rack swings, the resistance plates of the adjacent nuclear fuel storage racks hit each other, so that an effect of absorbing an impact can be expected.

  Further, in the nuclear fuel storage rack according to the present invention, the locking restraining mechanism includes a resistance plate extending downward to connect the upper end of the base plate and projecting downward, and surrounding the space below the base plate. It may be provided.

  In this invention, since the water below the base plate is surrounded by the resistance plate, if a tipping moment acts on the nuclear fuel storage rack, a fluid resistance is generated between the base plate surrounded by the resistance plate and the bottom surface of the storage pit. (Negative pressure is generated), and locking can be suppressed.

  Moreover, in the nuclear fuel storage rack of the present invention, it is desirable that the locking restraining mechanism includes a heavy object attached to the base plate and decentering the center of gravity of the nuclear fuel storage rack downward.

  In this invention, by attaching a heavy object to the base plate, the position of the center of gravity of the nuclear fuel storage rack can be decentered downward, and when a tipping moment acts on the nuclear fuel storage rack, it is locked by the fluid resistance of the resistance plate. In addition, the heavy load can suppress the overturning moment and can effectively suppress the rocking.

  Furthermore, in the nuclear fuel storage rack of the present invention, it is desirable that the resistance plate is formed in a dish shape that gradually inclines downward as it goes outward in the lateral direction.

  In the present invention, the resistance plate provided so as to extend the lower end of the support leg portion laterally outward is formed in a dish shape so that the resistance plate abuts on the bottom surface of the storage pit like a suction cup. Can be made. For this reason, when a falling moment acts on the nuclear fuel storage rack, a large fluid resistance (negative pressure) can be generated between the resistance plate and the bottom surface of the storage pit, and rocking can be suppressed more effectively. Become.

  According to the nuclear fuel storage rack of the present invention, a falling force acts on the nuclear fuel storage rack due to a horizontal force during an earthquake, and a fluid resistance of water in the storage pit is generated by the locking suppression mechanism. Thus, locking can be suppressed. Thus, even when the nuclear fuel storage rack is configured to slide in the event of an earthquake and a plurality of nuclear fuel storage racks are aligned in the water of the storage pit, collision between the nuclear fuel storage racks, the nuclear fuel storage rack It is possible to prevent the storage pit from colliding with the side wall.

It is a figure which shows the rack for nuclear fuel storage (locking suppression mechanism) which concerns on 1st Embodiment of this invention. It is the figure used for description which suppresses locking by the locking suppression mechanism of the nuclear fuel storage rack which concerns on 1st Embodiment of this invention. It is a figure which shows the rack for nuclear fuel storage (locking suppression mechanism) which concerns on 2nd Embodiment of this invention. It is the figure used for description which suppresses locking by the locking suppression mechanism of the nuclear fuel storage rack which concerns on 2nd Embodiment of this invention. It is a figure which shows the modification of the nuclear fuel storage rack (locking suppression mechanism) which concerns on 2nd Embodiment of this invention, and is a figure which shows the nuclear fuel storage rack which shortened the support leg part. It is a figure which shows the modification of the rack for nuclear fuel storage (locking prevention mechanism) which concerns on 2nd Embodiment of this invention, and is a figure which shows the rocking prevention mechanism provided with the resistance board surrounding the water between the baseplate and the bottom face of a storage pit. It is. It is a figure which shows the modification of the rack for nuclear fuel storage (locking suppression mechanism) which concerns on 2nd Embodiment of this invention, and is a figure which shows the locking suppression mechanism provided with the heavy article. It is the figure used for description which suppresses locking by the locking suppression mechanism of FIG. It is a figure which shows the modification of the nuclear fuel storage rack (locking suppression mechanism) which concerns on 2nd Embodiment of this invention, and is a figure which shows the locking suppression mechanism provided with the dish-shaped resistance board. It is a figure which shows the rack for nuclear fuel storage (locking suppression mechanism) which concerns on 3rd Embodiment of this invention. It is the figure used for description which suppresses locking by the locking suppression mechanism of the nuclear fuel storage rack which concerns on 3rd Embodiment of this invention. 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 conventional rack for nuclear fuel storage. It is a figure which shows the conventional rack for nuclear fuel storage. 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, the nuclear fuel storage rack according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. The present embodiment relates to a nuclear fuel storage rack for storing and storing spent nuclear fuel generated at, for example, a nuclear power plant in water in a storage pit of a nuclear fuel storage facility.

  The nuclear fuel storage rack B of the present embodiment is a self-supporting rack, and like the conventional nuclear fuel storage rack A, as shown in FIG. 1 (see FIGS. 12 and 13), the base plate 4 and the base plate 4 have upper ends. And a plurality of support legs 5 projecting downward, and a cell storage section 6 provided on the base plate 4 for storing and holding a plurality of vertical cells (rack cells) 1 for accommodating nuclear fuel assemblies. And is formed in a square box shape.

  On the other hand, in the nuclear fuel storage rack B of the present embodiment, when a tipping moment acts on the nuclear fuel storage rack B due to a horizontal force during an earthquake, the fluid resistance of the water in the storage pit 3 is generated to generate the nuclear fuel storage rack. A locking inhibiting mechanism 7 for inhibiting (preventing) B locking is provided.

  The locking restraining mechanism 7 of the present embodiment is supported by being connected to the base plate 4 with a support member 7a projecting downward with an upper end connected to the base plate 4 (supported by the base plate 4 via the support member 7a). ), And a resistance plate 7b extending in the horizontal direction (horizontal direction) T1. The resistance plate 7 b is disposed between the base plate 4 and the lower end T 2 of the lower end of the support leg 5. That is, the nuclear fuel storage rack B is stored in the water in the storage pit 3, and the resistance plate 7 b is supported by the bottom surface 3 b of the storage pit 3 with the support legs 5 being in contact with and supported by the bottom surface 3 b of the storage pit 3. Is provided so as to provide a gap H1 between the two.

  In the nuclear fuel storage rack B of this embodiment provided with such a locking deterrent mechanism 7, a horizontal force is applied to the nuclear fuel storage rack B due to a horizontal force during an earthquake (as shown in FIG. When the nuclear fuel storage rack B swings in response to the force), the rocking suppression mechanism 7 generates a fluid resistance of water in the storage pit 3.

  That is, when an overturning moment acts on the nuclear fuel storage rack B, a negative pressure is generated between the resistance plate 7b and the bottom surface 3b of the storage pit 3 where the lower end (lower surface) of the support leg 5 abuts to generate a fluid resistance.

  For this reason, the nuclear fuel storage rack B is restrained (prevented) by the fluid resistance generated by the rocking restraining mechanism 7. Therefore, it is possible to prevent the adjacent nuclear fuel storage racks B from colliding with each other and the nuclear fuel storage rack B from colliding with the side wall 3 a of the storage pit 3 as in the conventional art.

  Therefore, in the nuclear fuel storage rack B of the present embodiment, when a falling moment acts on the nuclear fuel storage rack B due to a horizontal force during an earthquake, a fluid resistance is generated between the resistance plate 7 b and the bottom surface 3 b of the storage pit 3. Thus, it is possible to suppress locking (by generating a negative pressure between the resistance plate 7b and the bottom surface 3b of the storage pit 3).

  Accordingly, the nuclear fuel storage rack B is configured to slide in the event of an earthquake, and even when a plurality of nuclear fuel storage racks B are aligned in the water of the storage pit 3, the nuclear fuel storage racks B by rocking It becomes possible to prevent the collision and the collision with the side wall 3a of the storage pit 3 of the nuclear fuel storage rack B.

  Further, by adjusting the size and shape of the resistance plate 7b, that is, the extension length of the resistance plate 7b in the lateral direction T1, it is also possible to freely adjust the locking suppression effect.

  The first embodiment of the nuclear fuel storage rack according to the present invention has been described above. However, the present invention is not limited to the first embodiment described above, and can be changed as appropriate without departing from the spirit of the present invention.

  Next, a nuclear fuel storage rack according to a second embodiment of the present invention will be described with reference to FIGS. As in the first embodiment, the present embodiment relates to a nuclear fuel storage rack provided with a locking restraining mechanism. For this reason, the same code | symbol is attached | subjected with respect to the structure similar to 1st Embodiment, and the detailed description is abbreviate | omitted.

  The nuclear fuel storage rack C of the present embodiment is a self-supporting rack, and as in the first embodiment, as shown in FIG. 3, the base plate 4, the support legs 5, the cell storage 6, and the locking restraining mechanism. 8.

  On the other hand, the locking restraining mechanism 8 of the nuclear fuel storage rack C of the present embodiment is configured by providing a resistance plate 8 a at the lower end of the support leg 5. The resistance plate 8a is provided so that the lower end (lower surface) of the support leg 5 extends outward in the lateral direction T1. Here, the width of the bottom plate attached to the lower end of the conventional support leg 5 is determined only from the structural strength against the vertical load and is not intended to prevent locking, so it is relatively narrow. there were. On the other hand, the resistance plate 8a provided at the lower end of the support leg 5 of the present embodiment is for generating a fluid resistance of water to prevent locking, and is larger than the bottom plate of the conventional support leg 5. The width is set so that the fluid resistance of water is effectively generated.

  In the nuclear fuel storage rack C of this embodiment provided with such a locking restraining mechanism 8 (resistance plate 8a), the resistance plate 8a provided at the lower end of the support leg 5 in a state of being stored in the storage pit 3 in water. Is supported in contact with the bottom surface 3 b of the storage pit 3.

  When a falling moment acts on the nuclear fuel storage rack C due to a horizontal force during an earthquake (when the nuclear fuel storage rack C swings due to a horizontal force as shown in FIG. 4), the locking pit 8 causes the storage pit to be stored. The fluid resistance of water in 3 is generated.

  That is, if a tipping moment is applied to the nuclear fuel storage rack C and the resistance plate 8a in contact with the bottom surface 3b of the storage pit 3 tries to move away from the bottom surface 3b, a negative force is generated between the resistance plate 8a and the bottom surface 3b of the storage pit 3. Pressure is generated and fluid resistance is generated.

  For this reason, the nuclear fuel storage rack C is inhibited (prevented) from locking by the fluid resistance generated by the locking inhibition mechanism 8. This prevents the adjacent nuclear fuel storage racks C from colliding with each other, and the nuclear fuel storage rack C from colliding with the side wall 3a of the storage pit 3 as in the prior art.

  Therefore, in the nuclear fuel storage rack C of the present embodiment, when a falling moment acts on the nuclear fuel storage rack C due to a horizontal force during an earthquake, fluid resistance is generated between the resistance plate 8a and the bottom surface 3b of the storage pit 3. Thus, it is possible to suppress locking (by generating a negative pressure between the resistance plate 8a and the bottom surface 3b of the storage pit 3).

  As a result, the nuclear fuel storage rack C is configured to slide in the event of an earthquake, and even if a plurality of nuclear fuel storage racks C are aligned in the water of the storage pit 3, It becomes possible to prevent the collision and the collision with the side wall 3a of the storage pit 3 of the nuclear fuel storage rack C.

  Similarly to the first embodiment, by adjusting the size and shape of the resistor plate 8a, that is, the extension length of the resistor plate 8a in the lateral direction T1, etc., it is possible to freely adjust the locking deterrent effect. Is possible.

  Furthermore, by providing the resistance plate 8a at the lower end of the support leg 5 in this way, it becomes possible to improve the stability of the nuclear fuel storage rack C not only during an earthquake but also during normal storage.

  The second embodiment of the nuclear fuel storage rack according to the present invention has been described above, but the present invention is not limited to the second embodiment described above, and can be changed as appropriate without departing from the spirit of the present invention. For example, as shown in FIG. 5, the support leg 5 may be shortened so that the resistance plate 8 a and the base plate 4, and thus the gap H <b> 2 between the base plate 4 and the bottom surface 3 b of the storage pit 3 may be reduced. In this case, a falling force acts on the nuclear fuel storage rack C in response to a horizontal force during an earthquake, and the resistance plate provided at the lower end of the support leg generates the fluid resistance of the water in the storage pit 3 for rocking. While restraining, fluid resistance can also be generated between the base plate and the bottom surface of the storage pit. This makes it possible to more reliably prevent (prevent) the locking of the nuclear fuel storage rack.

  In addition, as shown in FIG. 6, a locking deterrent mechanism C is provided with a resistance plate 8b that projects downward with the upper end connected to the base plate 4 and extends to surround a space below the base plate 4. It may be configured. In this case, since the water below the base plate 4 is surrounded by the resistance plate 8b, if a tipping moment is applied to the nuclear fuel storage rack C, the space between the base plate 4 surrounded by the resistance plate 8b and the bottom surface 3b of the storage pit 3 is increased. It is possible to prevent rocking by generating fluid resistance (generating negative pressure). Of course, the locking restraining mechanism may be configured by only the resistance plate 8b extending so as to surround the space below the base plate 4.

  Further, as shown in FIGS. 7 and 8, the locking restraining mechanism 8 may be configured by including a heavy object 9 that is attached to the base plate 4 and lowers the gravity center position G of the nuclear fuel storage rack C. In this case, since the gravity center position G of the nuclear fuel storage rack C is lowered by the heavy load 9, when a tipping moment acts on the nuclear fuel storage rack C, locking is suppressed by fluid resistance by the resistance plate 8a. The heavy load 9 can also suppress the overturning moment and can effectively suppress (prevent) locking. Such a heavy object 9 may be incorporated in the base plate 4 or may increase the weight of the base plate itself. In addition, you may comprise a locking suppression mechanism only with the heavy article 9. FIG.

  Furthermore, the modified example may be applied (combined) to the locking restraining mechanism of the first embodiment, and the same effects as described above can be obtained.

  Further, as shown in FIG. 9, the resistor plate 8a of the present embodiment may be formed in a dish shape that gradually inclines downward as it goes outward in the lateral direction T1. In this case, the resistance plate 8a can be brought into contact with the bottom surface 3b of the storage pit 3 like a suction cup. For this reason, when a tipping moment acts on the nuclear fuel storage rack C, a large fluid resistance (negative pressure) can be generated between the resistance plate 8a and the bottom surface 3b of the storage pit 3, thereby suppressing rocking more effectively ( Prevention).

  Next, a nuclear fuel storage rack according to a third embodiment of the present invention will be described with reference to FIGS. As in the first and second embodiments, the present embodiment relates to a nuclear fuel storage rack provided with a locking restraining mechanism. For this reason, the same code | symbol is attached | subjected with respect to the structure similar to 1st and 2nd embodiment, and the detailed description is abbreviate | omitted.

  The nuclear fuel storage rack D of the present embodiment is a self-supporting rack, and as in the first and second embodiments, as shown in FIG. 10, a base plate 4, a support leg 5, a cell storage 6, and The locking prevention mechanism 10 is provided.

  On the other hand, the locking suppression mechanism 10 of the nuclear fuel storage rack D of the present embodiment is configured to include a resistance plate 10a. The resistance plate 10a is supported with one end connected to the upper end side of the cell storage portion 6, and extends upward with a gap H3 in the lateral direction T1 from the outer surface of the cell storage portion 6.

  In the nuclear fuel storage rack D of this embodiment provided with such a locking deterrent mechanism 10, the resistance plates 10a of the adjacent nuclear fuel storage racks D are opposed (opposed) to be stored in the storage pit 3, It is stored with a small gap H4 between the resistance plates 10a.

  When a falling moment acts on the nuclear fuel storage rack D due to a horizontal force during an earthquake (when the nuclear fuel storage rack D swings due to a horizontal force as shown in FIG. 11), the resistance plates 10a are positioned between the resistance plates 10a. The fluid resistance of the water in the storage pit 3 is generated.

  For this reason, the nuclear fuel storage rack D is restrained (prevented) by the fluid resistance generated by the rocking restraining mechanism 10. As a result, the adjacent nuclear fuel storage racks D can be prevented from directly colliding with each other, and the nuclear fuel storage rack D can be prevented from directly colliding with the side wall 3a of the storage pit 3 as in the prior art.

  On the other hand, in the locking restraining mechanism 10 of the present embodiment, the resistance plates 10a of the adjacent nuclear fuel storage racks D will hit each other. However, when the nuclear fuel storage rack D greatly swings due to a large earthquake, the resistance plate 10a hits. The resistance plate 10a is deformed and energy is absorbed. As a result, locking is more reliably suppressed.

  Therefore, in the nuclear fuel storage rack D of the present embodiment, when a falling force acts on the nuclear fuel storage rack D due to a horizontal force during an earthquake, a fluid resistance is generated between the resistance plates 10a to suppress locking. It becomes possible to (prevent).

  Further, when the resistance plates 10a of the adjacent nuclear fuel storage racks D hit each other and the resistance plates 10a are deformed, energy can be absorbed, and locking can be more reliably suppressed.

  Thus, the nuclear fuel storage rack D is configured to slide in the event of an earthquake, and even if a plurality of nuclear fuel storage racks D are aligned in the water of the storage pit 3, It becomes possible to prevent the collision and the collision with the side wall 3a of the storage pit 3 of the nuclear fuel storage rack D.

  Further, by adjusting the size and shape of the resistor plate 10a, that is, the length of the resistor plate 10a extending in the vertical direction T2, it is possible to freely adjust the effect of suppressing the locking. Further, the gap H4 is not necessarily provided between the resistance plates 10a.

  As mentioned above, although 3rd Embodiment of the nuclear fuel storage rack which concerns on this invention was described, this invention is not limited to said 3rd Embodiment, Including the modification of 1st and 2nd embodiment, Changes can be made as appropriate without departing from the spirit of the invention. For example, in the present embodiment, the resistance plate 10 a is provided on the upper end side of the cell storage unit 6. However, the position of the resistance plate 10 a is not particularly limited to the upper end side of the cell storage unit 6.

  Finally, the locking restraining mechanism shown in the first to third embodiments may be appropriately selected and used together.

1 Vertical cell (rack cell)
2 Nuclear fuel storage facility 3 Storage pit 3a Side wall 3b Bottom (bottom)
4 Base plate 5 Support leg 6 Cell storage 6a Post 6b Cross member 6c Diagonal material (stay)
6d Peripheral plate 7 Locking deterrent mechanism 7a Strut portion 7b Resistance plate 8 Locking deterrent mechanism 8a Resistance plate 8b Resistive plate 9 Heavy load 10 Locking deterrent mechanism 10a Resistance plate A Conventional nuclear fuel storage rack B Nuclear fuel storage rack C Nuclear fuel storage rack D Nuclear fuel storage rack G Center of gravity position G 'Conventional center of gravity position H1 Gap H2 Gap H3 Gap H4 Gap T1 Horizontal direction (horizontal direction)
T2 vertical direction

Claims (7)

A nuclear fuel storage rack that is stored in an aligned arrangement in the water in the storage pit with the nuclear fuel assembly stored therein,
A base plate, a cell storage portion that is provided on the base plate and stores and holds a plurality of rack cells that contain the nuclear fuel assemblies, and a plurality of support legs projecting downward from the base plate with upper ends connected to each other. As well as
A locking deterrent mechanism is provided that generates a fluid resistance of water in the storage pit when a tipping moment is applied to the nuclear fuel storage rack in response to a horizontal force, thereby suppressing the locking of the nuclear fuel storage rack. Rack for nuclear fuel storage. The nuclear fuel storage rack according to claim 1,
The locking restraining mechanism is connected to the base plate and supported, and is provided with a resistance plate that is disposed between the base plate and the lower end of the support leg in the vertical direction and extends in the lateral direction. A nuclear fuel storage rack. The nuclear fuel storage rack according to claim 1 or 2,
The nuclear fuel storage rack according to claim 1, wherein the locking restraining mechanism includes a resistance plate provided so as to extend a lower end of the support leg portion outward in the lateral direction. The nuclear fuel storage rack according to any one of claims 1 to 3,
The locking restraining mechanism is configured to include a resistance plate that is supported with one end connected to the cell storage unit and extends upward with a gap in the lateral direction from the outer surface of the cell storage unit. A nuclear fuel storage rack. The nuclear fuel storage rack according to any one of claims 1 to 4,
The locking deterrent mechanism is configured to include a resistance plate extending downward to connect the upper end of the base plate and projecting downward and to surround a space below the base plate. Nuclear fuel storage rack. The nuclear fuel storage rack according to any one of claims 1 to 5,
The nuclear fuel storage rack according to claim 1, wherein the locking restraining mechanism includes a heavy object attached to the base plate and decentering a gravity center position of the nuclear fuel storage rack downward. The nuclear fuel storage rack according to claim 3,
A nuclear fuel storage rack, wherein the resistance plate is formed in a dish shape that gradually inclines downward as it goes outward in the lateral direction.

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