JP4276828B2 - Radioactive material dry storage building - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a radioactive material dry storage building, and in particular, a radioactive material dry type suitable for storing radioactive materials such as spent fuel assemblies generated from nuclear power plants and vitrified bodies of high-level radioactive waste. Regarding storage building.
[0002]
[Prior art]
Spent fuel fuel assemblies originating from nuclear power plants are reprocessed to recover reusable nuclear fuel materials such as uranium and plutonium. The generated high-level radioactive waste is vitrified. This vitrified body needs to be stored while being cooled until the calorific value due to decay heat becomes small and disposal becomes possible. The spent fuel assembly is stored in a storage pool in the nuclear power plant until it is reprocessed. However, the capacity of the storage pool in the nuclear power plant becomes insufficient for the spent fuel assemblies that are increasing year by year, and it is desired to construct a new storage building that can temporarily store the spent fuel assemblies.
[0003]
An example of a radioactive substance dry storage building corresponding to these purposes is disclosed in Patent Document 1, for example. This radioactive material dry storage building has a plurality of fuel storage chambers for storing spent fuel assemblies. Each fuel storage chamber is partitioned by a partition wall. Each fuel storage chamber is provided with a plurality of storage pipes storing spent fuel assemblies. The air flowing in from the outside air inlet flows into the fuel storage chamber, cools the storage pipe, and is discharged outside through the exhaust port. The storage operation of the spent fuel assembly in the storage pipe in the fuel storage chamber is performed by a floor traveling crane that is a self-propelled loading machine that moves in the fuel loading chamber located above the fuel storage chamber. The spent fuel assembly is stored in the storage pipe while being loaded on the canister.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-193786, pages 5 to 7, FIGS. 1 to 4
[0005]
[Problems to be solved by the invention]
Since a large-scale floor traveling crane travels above the entire fuel storage chamber, it is not possible to install structural members such as walls and pillars that hinder the movement of the floor traveling crane in the fuel loading chamber. Therefore, the ceiling of the fuel loading chamber, that is, the roof of the radioactive material dry storage building, has to have a large-scale steel structure or truss structure to support the load. Moreover, the effective space in the fuel loading chamber required for the traveling of the floor traveling crane is lower than the lower end of the large steel structure or truss structure member. The large steel structure or truss structure has a dead space, and the radioactive material dry storage building increases the building volume. Furthermore, the dimension of the span in the air flow direction of the fuel storage chamber correlates with the girder dimension of the floor traveling crane. That is, when the span dimension in the air flow direction of the fuel storage chamber is increased, the girder dimension of the floor traveling crane is also increased, and the floor traveling crane load is increased more than necessary. For this reason, the length of the fuel storage chamber in the air flow direction cannot be increased.
[0006]
An object of the present invention is to provide a radioactive material dry storage building capable of simplifying the structure of a roof.
[0007]
[Means for Solving the Problems]
A feature of the present invention that achieves the above-described object is that a radioactive material loading area formed above a radioactive material storage chamber, which is separated from each other by a side wall and is provided with a plurality of storage tubes for storing radioactive materials, is provided on the floor surface. One of the walls and pillars supporting the roof is installed so that the radioactive material transport means can pass therethrough. Since the weight of the roof covering the radioactive material loading area is supported by the wall or pillar, the structure of the roof can be simplified.
[0008]
Preferably, the wall or column is arranged on an extension of the side wall formed between adjacent radioactive substance storage chambers. For this reason, the load of the roof supported by the wall or pillar can be directly transmitted to the side wall, and the thickness of the ceiling of the radioactive material storage chamber, that is, the floor of the radioactive material loading area can be reduced.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
An example of a preferred radioactive material dry storage building of the present invention will be described below with reference to FIGS.
[0010]
The radioactive substance dry storage building 1 of the present embodiment has a plurality of fuel storage rooms (radioactive substance storage rooms) 2 and a plurality of fuel loading rooms (radioactive substance loading areas) 13. The radioactive material dry storage building 1 made of reinforced concrete has three fuel storage chambers 2 and three fuel loading chambers 13. Each fuel storage chamber 2 is formed between the ceiling slab 3 and the floor slab 4. A plurality of storage tubes 5 are arranged in each fuel storage chamber 2. The upper ends of these storage pipes 5 are attached to the ceiling slab 3 and extend toward the floor slab 4 in the vertical direction. Each storage tube 5 has a shielding plug 18 attached to the upper end portion in a removable manner. When the shielding plug 18 is removed from the storage tube 5, the space in the storage tube 5 is communicated with the fuel loading chamber 13. Each fuel storage chamber 2 is provided with a partition member 10 in the horizontal direction in the middle of the height direction. Each storage tube 5 penetrates the partition member 10. Each fuel storage chamber 2 forms an upper cooling flow path 28 between the partition member 10 and the ceiling slab 3, and a lower cooling flow path 29 between the partition member 10 and the floor slab 4. The fuel storage chamber 2, specifically, the upper cooling passage 28 and the lower cooling passage 29 are connected to the air inflow passage 6. The air inflow passage 6 is connected to the outside of the radioactive substance dry storage building 1 through an air intake port 17. The fuel storage chamber 2, specifically, the upper cooling passage 28 and the lower cooling passage 29 are connected to the air discharge passage 7. The air discharge passage 7 is connected to the outside through an air discharge port 17. Adjacent fuel storage chambers 2 are separated from each other by side walls 21. The rectifying member 8A is installed on the partition member 10 on the air inflow passage 6 side. The rectifying member 8B is installed on the floor slab 4 on the air inflow passage 6 side. The rectifying member 9A is installed on the partition member 10 on the air discharge passage 7 side. The flow regulating member 9B is installed on the floor slab 4 on the air discharge passage 7 side.
[0011]
The rod-shaped radiation shield 42 is located in the upper cooling flow path 28 on the upstream side of the group of the storage tubes 5 and in the lower cooling flow path 29 on the downstream side of the storage tube 5 group. In the upper cooling flow path 28 on the upstream side, the lower cooling flow paths 29 on the downstream side of the group of the storage pipes 5 are respectively extended in the horizontal direction. At the installation position of the rod-shaped radiation shields 42, the rod-shaped radiation shields 42 located on the upstream side face the gap formed between the rod-shaped radiation shields 42 located on the downstream side in the height direction. Placed in. With this arrangement, the radiation emitted from the spent fuel assembly in the storage tube 5 is shielded by the rod-shaped radiation shields 42.
[0012]
Each fuel loading chamber 13 is located above each fuel storage chamber 2 and above the ceiling slab 3. Side walls 20 are provided between the adjacent fuel loading chambers 13. The side wall 20 is installed on the ceiling slab 3 on the extended line of the side wall 21. Each side wall 20 supports the roof 30 of the radioactive substance dry storage building 1. An opening 23 through which the air pallet type transport vehicle 16 that transports the canister can pass is formed in each side wall 20. The opening 23 is a passage through which the air pallet type transport vehicle 16 passes. For this reason, each fuel loading chamber 13 is in communication with the opening 23.
[0013]
The air pallet type transport vehicle 16 that is a transport vehicle includes a chassis 43 provided with an air pallet 24 at a lower portion and a canister storage casing 44 provided with a hoisting device 26 at an upper portion. The air pallet type transport vehicle 16 can transport a canister with a built-in spent fuel assembly mounted on a chassis 43 in a canister storage casing 44. The air pallet type transport vehicle 16 moves on the floor surface of the fuel loading chamber 13 (the upper surface of the ceiling slab 3) in the fuel loading chamber 13. The air pallet type transport vehicle 16 blows air downward from the air pallet 24 and floats, and moves forward or backward by a traveling power unit (not shown) (for example, a carriage described in JP-A-2002-148386). Is done.
[0014]
In the nuclear power plant, the spent fuel assembly is stored in the canister 34, and the canister 34 is further stored in the fuel transport container 32. The fuel transport container 32 is transported from the nuclear power plant to the radioactive material dry storage building 1 by the trailer 31. The fuel transport container 32 is lifted from the trailer 31 by using an overhead crane 36 (see FIG. 4) in the radioactive substance dry storage building 1, and is a hatch 25, a canister handling area 37, and a hatch 38 that is an opening. To the canister receiving chamber 35. The canister handling area 37 is formed above the canister receiving chamber 35 and the fuel transport container storage chamber 33. The lid of the fuel transport container 32 is removed in the canister receiving chamber 35, and the canister 34 in the fuel transport container 32 is lifted by an overhead crane 39 (see FIG. 4) in the canister receiving chamber 35. Taken from. The fuel transport container 32 from which the canister 34 has been taken out is transported to the fuel transport container storage chamber 33 by the overhead crane 36 through the hatch 38, the canister handling area 37, and the opening 27, and is temporarily stored therein. The canister 34 is lifted by the overhead crane 36 through the hatch 38 to the upper canister handling area 37. The canister 34 is placed on the air pallet transport vehicle 16 in the canister handling area 37. Specifically, the canister 34 is placed on the chassis 43 in the canister storage casing 44. The hatches 25 and 38 and the opening 27 are formed on the floor of the canister handling area 37 (the ceiling of the canister receiving chamber 35). The hatches 25 and 38 are covered with grating except for passing the fuel transport container 32 or the canister 34.
[0015]
The air pallet type transport vehicle 16 is driven, and the fuel adjacent to the canister handling area 37 passes through an opening 41 provided in the side wall 40 that partitions the canister handling area 37 and the fuel loading chamber 13 adjacent thereto. It reaches into the loading chamber 13. The opening 41 is sealed by a door that can be opened and closed. The air pallet-type transport vehicle 16 further has a predetermined fuel loading chamber (for example, the rightmost fuel loading chamber in FIG. 3) directly above the fuel storage chamber 2 where the storage pipe 5 in which the canister 34 is loaded. Move to 13. During this movement, the air pallet transport vehicle 16 passes through an opening 23 formed in the side wall 20. The opening 23 has a size through which the air pallet type transport vehicle 16 can pass. When the air pallet-type transport vehicle 16 reaches directly above the predetermined storage tube 5 in the fuel loading chamber 13, the hoisting device 26 lifts the shielding plug 18 that seals the upper end of the storage tube 5 to lift the air pallet. It is stored in the transport vehicle 16. Next, the canister 34 placed on the air pallet type transport vehicle 16 is once lifted by the hoisting device 26 and then lowered into the storage tube 5. After the canister 34 is stored in the storage tube 5, the shielding plug 18 stored in the air pallet type transport vehicle 16 is lowered to the upper end portion of the corresponding storage tube 5 by the hoisting device 26, and the shielding plug 18 is moved to the storage tube. Attach to 5 and seal. The air pallet-type transport vehicle 16 can freely move on the floor surface of the fuel loading chamber 13 and the like, not on a predetermined track.
[0016]
Air outside the radioactive substance dry storage building 1 flows into the air inflow passage 6 from the air intake port 17. This air passes through the air inflow passage 6 and the rod-shaped radiation shield 42, respectively, and reaches the upper cooling flow path 28 and the lower cooling flow path 29 in the fuel storage chamber 2. The heat released from the spent fuel assembly stored in the canister in the storage tube 5 is transmitted to the storage tube 5. In each flow path, the air passing between the storage tubes 5 takes the heat of the storage tubes 5 and cools the storage tubes 5. The air that has passed between the storage tubes 5 passes between the rod-shaped radiation shields 42 arranged on the downstream side, passes through the air discharge passage 7, and is discharged to the outside from the air discharge port 17.
[0017]
In the present embodiment, since the side walls 20 provided between the fuel loading chambers 13 support the roof 30, the load on the roof 30 is applied to the side walls (for example, the air inflow passage 6) that form the outer surface of the radioactive substance dry storage building 1. And the respective side walls forming the air discharge passage 7), as well as the side walls 20. Therefore, the structure of the roof 30 can be simplified. In particular, since the strength required for the roof 30 itself can be reduced by increasing the support points, the weight of the roof 30 can also be reduced. This also contributes to simplification of the structure of the roof 30. In the conventional example, in order to increase the strength of the roof, a structure material having a width in the height direction (for example, a truss) is used for the roof, so a dead space is formed below the roof, and the level of the upper surface of the roof is high. It was. In the present embodiment, since the roof 30 is supported by the side walls 20, the width in the height direction of the structural material constituting the roof 30 can be reduced. For this reason, the said dead space can be reduced and also the level of the upper surface of the roof 30 can be reduced.
[0018]
Since the side wall 20 is located on the extension line of the side wall 21 provided between the fuel storage chambers 2, the load of the roof 30 can be transmitted from the side wall 20 to the side wall 21. Therefore, the load of the roof 30 can be transmitted to the floor slab 4 without increasing the thickness of the ceiling slab 3. Since the plurality of side walls 20 are arranged on the extension lines of the side walls 21 corresponding to the respective side walls 20, the load of the roof 30 can be distributed and transmitted to the floor slab. According to the present embodiment, it is possible to obtain a rational and space-efficient radioactive material dry storage building excellent in earthquake resistance.
[0019]
Since the side wall 20 is disposed on an extension line of the side wall 21 formed between the adjacent fuel storage chambers 2, the load of the roof 30 supported by the side wall 20 can be directly transmitted to the side wall 20. It is not necessary to increase the thickness of the ceiling slab 3, that is, the floor of the fuel loading chamber 13, and the thickness can be reduced.
[0020]
Each effect of the present embodiment described above is brought about by transporting the canister 34 using the air pallet type transport vehicle 16 that can freely move on the floor surface.
[0021]
Since both ends in the horizontal direction of the side wall 20 having the opening 23 are connected to the side wall forming the air inflow passage 6 and the other side wall forming the air discharge passage 7, the seismic resistance of the radioactive substance dry storage building 1 is improved. Further improvement.
[0022]
Furthermore, since the light weight air pallet type conveyance vehicle 16 is used without using a heavy conventional floor traveling crane, the load applied to the ceiling slab 3 can be reduced. The application of the air pallet transport vehicle 16 allows the width of the radioactive substance dry storage building in the flow direction of the cooling air in the fuel storage chamber 2 to be freely set.
[0023]
In the present embodiment, since the casing of the roof 30 supported by the side wall 20 can be thickened, the protection against external flying objects, which has been conventionally performed by the ceiling slab of the fuel storage chamber, is the ceiling of the fuel loading chamber 13, that is, This can be done with the roof 30. For this reason, it is not necessary to take a protective measure against an external flying object to the transport equipment for transporting the canister, specifically, the air pallet transport vehicle 16.
[0024]
In the above-described embodiment, the opening 23 is formed in the side wall 20, but it is possible to move between the fuel loading chambers (radioactive material loading chambers) 13 separated by the side wall 20 without forming the opening 23 in the side wall 20. Alternatively, a conveyance vehicle passage for the air pallet type conveyance vehicle 16 may be formed. In other words, the conveyance vehicle passage is provided between one end surface of the side wall 20 and the side wall forming the air inflow passage 6 (between the other end surface of the side wall 20 or another side wall forming the air discharge passage 7). Form. The opening 23 described above is also a conveyance vehicle passage.
[0025]
In the embodiment described above, a plurality of fuel loading chambers 13 partitioned by the side walls 20 are formed above the plurality of fuel storage chambers 2, but one wide area without the side walls 20 above the plurality of fuel storage chambers 2. A fuel loading chamber may be formed. In this case, the roof 30 is supported by a plurality of columns installed directly above the side wall 21 (on the extension line of the side wall 21) instead of the side wall 20. At least one of the intervals between the plurality of columns installed just above one side wall 21 may be a width that allows the air pallet transport vehicle 16 to pass between the two columns forming the interval. . It can be said that a conveyance vehicle passage is formed between two pillars having a width through which the air pallet type conveyance vehicle 16 can pass.
[0026]
Moreover, although the radioactive substance dry-type storage building 1 demonstrated taking the case of storing a spent fuel assembly as an example, instead of a spent fuel assembly, radioactive waste solidified bodies, such as a glass solidified body of a high level radioactive waste This can also be applied to the case of storing in the storage tube 5.
[0027]
【The invention's effect】
According to the present invention, the side walls provided between the fuel loading chambers support the roof, and the lightweight air pallet type transport vehicle is used . Therefore, the structure of the radioactive material dry storage building roof can be simplified.
[Brief description of the drawings]
1 is a longitudinal sectional view (II sectional view of FIGS. 2 and 3) of a radioactive substance dry storage building according to a preferred embodiment of the present invention;
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
3 is a cross-sectional view taken along the line III-III in FIG.
4 is a cross-sectional view taken along the line IV-IV in FIGS. 2 and 3. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Radioactive material dry-type storage building, 2 ... Fuel storage room, 3 ... Ceiling slab, 4 ... Floor slab, 5 ... Storage pipe, 6 ... Air inflow passage, 7 ... Air discharge passage, 10 ... Partition member, 13 ... Fuel loading Chamber 16, air pallet type carriage 20, 21 side wall 23, opening 23, air pallet 26, hoisting device 28, upper cooling channel 29, lower cooling channel 44, canister housing casing .

Claims (1)

A plurality of radioactive material storage chambers separated from each other by a side wall and arranged with a plurality of storage tubes for storing radioactive materials, and an air inflow connected to the radioactive material storage chamber and supplying external air to the radioactive material storage chamber A radioactive material conveying means having an air pallet, which is formed above the radioactive material storage chamber, is connected to the passage, the radioactive material storage chamber and discharges the air in the radioactive material storage chamber, and moves. A radioactive material loading area and a roof that covers the radioactive material loading area, and having an opening through which the radioactive substance conveying means can pass, and a plurality of radioactive substance loading areas by a second side wall that supports the roof. It is separated, the second side wall, the floor of the radioactive substance loading area on the extension of the side wall formed between the radioactive substance storage chamber mutually adjacent It radioactive material dry storage building, characterized in that disposed.

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