JP2004045230A - Facility for storing radioactive substance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To compact a facility for storing radioactive substances which is suitable to store spent fuel assemblies and vitrified high-level radioactive waste. <P>SOLUTION: The facility 1 for storing spent nuclear fuel has fuel storage areas 5 for storing fuel casks 2 in a storage building 30. The fuel storage areas 5 are located on both sides of a central wall 13 of the building 30 and have fuel storage rooms 11 partitioned with bulkheads 21. An exhaust passage 12 is placed on the side of the building central wall 13 in each of the fuel storage rooms 11, and an air supply passage 31 is placed on the side of a building outer wall 17 of each of the fuel storage rooms 11. Each of the fuel storage rooms 11 communicates with the exhaust passage 12 through an opening 19 and the fuel storage rooms 11 and the air supply passage 12 communicate with an opening 20. A passage 18 for carrying in and out the casks 2 is formed by allowing each of the air supply passages 31 to communicate through an opening 22a (or 22b). The fuel casks 2 are carried into the fuel storage rooms 11 by way of passages 15 and 18 for carrying in and out the casks 2. Since the exhaust passage 12 and the air supply passage 31 are also used as the passage 18 for carrying in and out the casks 2, the facility 1 for storing the spent fuel can be compacted. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a radioactive material storage facility, and more particularly to a radioactive material storage facility suitable for storing spent fuel assemblies and solidified high-level radioactive waste.
[0002]
[Prior art]
In a nuclear power plant, the fuel assemblies loaded in the nuclear reactor are sequentially replaced with new fuel assemblies according to the years of use. At this time, the spent fuel assemblies removed from the nuclear reactor continue to emit radiation and heat resulting from the destruction of fissile material, and are generally stored in water in a storage pool provided in a nuclear power plant. Cooling.
[0003]
Due to the increase in the number of spent fuel assemblies stored in nuclear power plants, a dry-type radioactive material storage facility will be constructed, and the spent fuel assemblies stored in the storage pool in nuclear power plants will be activated. Transfer to a substance storage facility is contemplated. An example of the radioactive substance storage facility is disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-193786.
[0004]
The radioactive material storage facility described in Japanese Patent Application Laid-Open No. 2000-193786 is provided with a plurality of fuel storage chambers in a storage building, in which a number of fuel storage pipes for storing a spent fuel assembly are arranged. A cooling air supply passage for supplying cooling air to the inside of each storage chamber is provided, and a cooling air discharge passage for discharging cooling air from the inside of each fuel storage chamber is provided. In the storage building, a pair of fuel storage chambers are arranged so as to face each other with the cooling air discharge passage therebetween, and are connected to one exhaust tower shared by both cooling air discharge passages. The exhaust tower is installed on the roof of the storage building. Outside air intakes for taking outside air into the cooling air supply passages respectively connected to the pair of fuel storage chambers are provided on both side walls of the storage building on the opposite side to the exhaust tower. Such a pair of fuel storage rooms are arranged in a plurality of rows in parallel in a storage building of a radioactive material storage facility. A respective exhaust tower for discharging cooling air guided by a cooling air discharge passage leading to each pair of fuel storage chambers is provided on the roof of the storage building.
[0005]
[Problems to be solved by the invention]
The height of the storage building in the conventional radioactive material storage facility described above is generally the required height of the fuel storage room, the height of the fuel loading room in which the fuel loading machine moves above the fuel storage room, and the mat of the storage building. Is determined in consideration of the thickness and the like. The fuel loading machine is a moving device that loads a canister storing a spent fuel assembly into each of the fuel storage pipes. The height of the storage building is increased due to the placement of the fuel loading compartment above the fuel storage compartment.
[0006]
Further, in order to load the spent fuel assembly into the fuel storage pipe in the fuel storage chamber, it is necessary to perform the following steps (1) to (3) in order to store the spent fuel assembly in the storage area.
(1) A spent fuel assembly taken out of a fuel storage pool of a nuclear power plant is loaded in a canister, and this canister is stored in a fuel cask for transportation.
(2) Accept the fuel cask from the nuclear power plant into the storage building of the radioactive material storage facility.
(3) After receiving the canister, the canister is taken out of the fuel cask for transportation, and the canister loaded with the spent fuel assembly is loaded into the fuel storage pipe using a fuel loading machine.
[0007]
For this reason, the storage building is equipped with a trailer area for receiving a trailer equipped with a fuel cask, a fuel cask pit for removing canisters containing spent fuel assemblies from the fuel cask, and a trailer that has entered the trailer area An overhead crane that lifts and lowers the fuel cask and transports the fuel cask to the fuel cask pit, and a self-propelled type that loads the fuel storage room and the canister taken out of the fuel cask pit into the fuel storage tube of the fuel storage room. And a fuel loading chamber in which a fuel loading machine that moves on the rail is installed.
[0008]
An object of the present invention is to provide a radioactive substance storage facility that can be made compact.
[0009]
[Means for Solving the Problems]
A feature of the present invention that achieves the above object is that an air supply-side cask transport passage formed by connecting air supply passages provided corresponding to the respective radioactive substance storage chambers to each other, There is provided at least one of an air discharge side cask transfer passage formed so as to communicate with an air discharge passage provided corresponding to the chamber.
[0010]
The air supply passages that are provided for each radioactive material storage chamber and supply cooling air are connected to each other to interconnect the air supply side cask transport passage, and the cooling air that is provided for each radioactive material storage room. The air supply passages and the air supply side cask transfer passages, or the air discharge passages and the air discharge side cask transfer passages are formed in order to mutually connect the air discharge passages to be discharged to form at least one of the air discharge side cask transfer passages. And can be shared. Therefore, a space for forming the air supply side cask transfer passage or the air discharge side cask transfer passage becomes unnecessary, and the radioactive substance storage facility can be made compact.
[0011]
In particular, by forming both an air supply side cask transfer passage interconnecting each air supply passage and an air discharge side cask transfer passage interconnecting each air discharge passage, a cask that can access each radioactive substance storage chamber is formed. Since two routes can be formed in the transport passage, the cask storing the radioactive material can be easily carried in and out of each radioactive material storage room, and the time required for carrying in or out can be reduced. By forming both cask transport passages, the radioactive material storage facility can be made compact.
[0012]
Preferably, a first opening is formed in a side wall that defines the radioactive material storage chamber, and has a first opening through which a cask is inserted into and out of the radioactive material storage chamber from the air supply passage, and a radioactive material storage chamber formed in the side wall thereof from the air discharge passage. Since the second opening for taking in and out the cask is not arranged to face each other, the cask can be easily carried into different positions in the radioactive substance storage chamber from both openings. More preferably, the side wall portion where the first opening is formed and the side wall portion where the second opening is formed are opposed to each other, and the openings are displaced from the positions of the side wall portions. Have been.
[0013]
Preferably, an air supply-side cask transfer passage formed by connecting the air supply passages provided corresponding to the respective radioactive substance storage chambers to each other, and air provided corresponding to the respective radioactive substance storage chambers At least one of the air discharge side cask transfer passages formed by mutually communicating the discharge passages, the paired radioactive substance storage chambers are arranged in series, and the radioactive substance storage chambers are sandwiched by the corresponding air discharge passages. And the respective exhaust passages leading to the paired radioactive material storage rooms are connected to a common exhaust tower.
[0014]
As a result, the air supply passage and the air supply-side cask transfer passage, or the air discharge passage and the air discharge-side cask transfer passage, can be shared, and the exhaust tower can be shared. Can be
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
The spent fuel storage facility 1 of the present invention temporarily stores the fuel cask 2 in the storage building 30 regardless of the presence or absence of the plurality of trailer areas 3 and the storage of the spent fuel assemblies into which a trailer equipped with the fuel cask 2 enters. There are three areas, a fuel cask storage area 4 for temporarily storing a fuel cask 2 storing a canister loaded with spent fuel assemblies therein, and a fuel storage area 5 for storing a canister loaded with spent fuel assemblies.
[0016]
The fuel storage area 5 has a plurality of fuel storage chambers 11 arranged on both sides of the building central wall 13 along the building central wall 13. Each fuel storage chamber 11 is partitioned by a partition 21 arranged at right angles to the center wall 13 of the building. The partition 21 is attached to the floor slab 9 and the ceiling slab 10, as shown in FIG. On the building central wall 13 side of each fuel storage room 11, an exhaust side wall 24 is connected to the partition 21 and provided in parallel with the building central wall 13. The exhaust passage 12 is formed between the exhaust side wall 24 and the center wall 13 of the building. The fuel storage chamber 11 and the exhaust passage 12 communicate with each other through an opening 19 formed in the exhaust side wall 24. The respective exhaust passages 12 formed on one side of the center wall 13 of the building communicate with each other through openings 23 a formed in the respective partition walls 21. Each exhaust passage 12 formed on the other side of the center wall 13 of the building communicates with an opening 23 b formed on each partition 21. The openings 19, 23a, 23b extend upward from the floor surface. Each exhaust passage 12 is connected to an exhaust tower 8 installed on the center side of the storage building 30, and communicates with an outlet 32 that opens to the outside. In the exhaust tower 8, a shielding structure 14 extends upward from an upper end of the center wall 13 of the building.
[0017]
On the building exterior wall 17 side opposite to the building center wall 13 with the fuel storage room 11 interposed therebetween, an air supply side wall 25 is connected to the partition 21 and provided in parallel with the building exterior wall 17. An air supply passage 31 is formed between the air supply side wall 25 and the building outdoor wall 17, respectively. The fuel storage chamber 11 and the air supply passage 31 communicate with each other through an opening 20 formed in the air supply side wall 25. Each of the air supply passages 31 formed on one of the building outdoor walls 17 communicates with an opening 22 a formed in each partition 21. The air supply passages 31 formed on the other building exterior wall 17 side communicate with each other by openings 22 b formed in the partition walls 21. The openings 20, 22a, 22b extend upward from the floor surface (the upper surface of the floor slab 9). A plurality of outside air intakes 7 that are open to the outside are provided in both building exterior walls 17. Each outside air intake 7 is connected to a corresponding air supply passage 31. The cask carrying-in / out passage 18 is formed by a plurality of air supply passages 31 connected by the opening 22a (or the opening 22b). The other cask carrying-in / out passage 15 is formed by a plurality of exhaust passages 12 connected by the opening 23a (or the opening 23b).
[0018]
Each fuel storage chamber 11 is defined by a partition 21, a floor slab 9 and a ceiling slab 10 as shown in FIG. 3, and is located between a supply side wall 25 and an exhaust side wall 24 as shown in FIG. 1.
[0019]
The fuel cask storage area 4 is arranged on one end side of the center wall 13 of the building. Trailer areas 3 are provided at three locations and are connected to a fuel cask storage area 4. An auxiliary facility room 6 and the like necessary for operation and management of the storage building 30 are provided.
[0020]
The spent fuel assemblies stored in the storage pool in the nuclear power plant are loaded in the canister, and the canister is stored in the fuel cask. The fuel cask is mounted on a trailer and transported from the nuclear power plant to the spent fuel storage facility 1. The truck enters the trailer area 3. Here, the fuel cask 2 on the trailer is transported by the overhead crane 33 and is temporarily stored in the fuel cask storage area 4. The fuel cask 2 in the fuel cask storage area 4 is mounted by an overhead crane 33 on an air pallet (not shown) that is a transport means. The fuel cask 2 is transported by the air pallet through the cask carry-in / out passage 18 (or the cask carry-in / out passage 15) to the vicinity of the corresponding fuel storage chamber 11. Further, the air pallet enters the corresponding fuel storage chamber 11 through the opening 20, and the mounted fuel cask 2 is lowered from the air pallet and stored in the fuel storage chamber 11. Even when the fuel cask 2 in the fuel storage chamber 11 is carried out of the storage building 30, the fuel cask 2 is mounted on an air pallet (not shown), passes through the cask carry-in / out passage 18 (or the cask carry-in / out passage 15), and has a trailer area. 3 are carried out.
[0021]
The air (outside air) taken in from the outside air inlet 7 reaches the fuel storage chamber 11 through the air supply passage 31 and the opening 20. This air flows out of the opening 19 into the exhaust passage 12 through the cooling air passage 34 formed between the fuel casks 2 in the fuel storage chamber 11. The air in the exhaust passage 12 is exhausted from the exhaust port 32 of the exhaust tower 8 to the outside. The air cools the fuel cask 2 while passing through the cooling air passage 34. As a result, the spent fuel assembly in the fuel cask 2 is cooled.
[0022]
In the present embodiment, an air supply passage 31 for each fuel storage chamber 11 is communicated by an opening 22a (or an opening 22b) to form a cask carry-in / out passage 18, and an exhaust passage 12 for each fuel storage area 5 is opened to an opening 23a. Since the cask carrying-in / out passage 15 is formed by communicating with each other (or the opening 23b), the air supply passage 31 (or the exhaust passage 12) for each fuel storage area 5 can be shared with the cask carrying-in / out passage. For this reason, the floor area and volume of the storage building 30 can be significantly reduced, and the storage building 30 can be made compact.
[0023]
The fuel cask 2 can be moved into and out of one fuel storage chamber 11 from both the air supply passage side and the exhaust passage side, so that the fuel cask 2 can be carried in and out efficiently. In particular, since the opening 20 on the supply passage 31 side and the opening 19 on the exhaust passage 12 side are provided not in opposition but in positions, the fuel cask 2 is stored using the openings 19 and 20. It can be easily transported to the storage position in the chamber 11. Conversely, when the fuel cask 2 in the fuel storage chamber 11 is carried out, it can be easily performed.
[0024]
In this embodiment, since the fuel cask 2 containing the canister is stored in the fuel storage chamber 11, there is no need to remove the canister from the fuel cask 2 as in the conventional case, and the spent fuel assembly is transported to the fuel storage chamber 11. Procedure can be simplified. Further, in the present embodiment, the cask pit conventionally required for performing the operation of removing the canister from the fuel cask 2 becomes unnecessary. Further, a self-propelled fuel loading machine that moves on a rail is not required to transport the canister taken out of the cask pit to the canister storage area, so that the height of the storage building 30 can be reduced.
[0025]
In the present embodiment, since the exhaust tower 8 is arranged on the center side of the storage building 30, the exhaust tower 8 discharges the air discharged from the pair of fuel storage chambers 11 to the respective exhaust passages 12 to the outside. Can be shared as an exhaust tower.
[0026]
In the above-described embodiment, the fuel storage chamber 11 can be accessed from both the cask carry-in / out passages 15 and 18. However, even when only one of the cask carry-in / out passages 15 and 18 is provided, the spent fuel storage facility can be accessed. Storage building can be made compact.
[0027]
In the above-described embodiment, the case where the spent fuel assembly is stored as the radioactive material is described. However, a solidified radioactive waste (for example, a vitrified high-level radioactive waste as a reprocessing waste liquid) is stored. The present invention is also applicable to the case where the cask is stored in a radioactive substance storage chamber (fuel storage chamber in the above embodiment).
[0028]
【The invention's effect】
According to the present invention, the radioactive substance storage facility can be made compact.
[Brief description of the drawings]
FIG. 1 is a horizontal sectional view of a storage building of a radioactive material storage facility according to a preferred embodiment of the present invention.
FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 3 is a sectional view taken along line BB of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Spent fuel storage facility, 2 ... Fuel cask, 3 ... Trailer area, 4 ... Fuel cask storage area, 5 ... Fuel storage area, 7 ... Outside air intake, 8 ... Exhaust tower, 11 ... Fuel storage room, 12 ... Exhaust passage, 13: Building central wall, 15, 18: Cask carry-in / out passage, 17: Building outdoor wall, 19, 20, 22a, 22b, 23a, 23b: Opening, 21: Partition wall, 24: Exhaust side wall, 25: Air supply Side walls, 30: storage building, 31: air supply passage.

Claims (3)

A plurality of radioactive substance storage chambers that are arranged in parallel and store a cask containing radioactive substances therein, and are provided for each of the radioactive substance storage chambers to take in external air and supply the air to the radioactive substance storage chambers An air supply passage and an air discharge passage provided for each of the radioactive substance storage chambers and discharging air discharged from the radioactive substance storage chamber to the outside,
An air supply-side cask transport passage formed in communication with the air supply passages provided for each of the radioactive substance storage chambers, and the air supply-side cask transfer path provided for each of the radioactive substance storage chambers; A radioactive substance storage facility comprising at least one of an air discharge side cask transfer passage formed by connecting air discharge passages to each other. A plurality of radioactive substance storage chambers that are arranged in parallel and store a cask containing radioactive substances therein, and are provided for each of the radioactive substance storage chambers to take in external air and supply the air to the radioactive substance storage chambers An air supply passage, an air discharge passage that is provided for each of the radioactive substance storage chambers and discharges air discharged from the radioactive substance storage chamber to the outside, and is provided corresponding to each of the radioactive substance storage chambers. The air supply passages formed in communication with each other are formed so as to communicate with each other, and the air discharge passages provided corresponding to the respective radioactive substance storage chambers are formed in communication with each other. An air discharge side cask transfer passage,
A first opening formed in a side wall that defines the radioactive material storage chamber and for taking the cask in and out of the radioactive material storage chamber from the air supply passage; and a first opening formed in the side wall and receiving the radioactive material from the air discharge passage. A radioactive substance storage facility, wherein the second opening for taking the cask in and out of the substance storage chamber is not arranged to face each other. A plurality of radioactive substance storage chambers that are arranged in parallel and store a cask containing radioactive substances therein, and are provided for each of the radioactive substance storage chambers to take in external air and supply the air to the radioactive substance storage chambers An air supply passage and an air discharge passage provided for each of the radioactive substance storage chambers and discharging air discharged from the radioactive substance storage chamber to the outside,
An air supply-side cask transport passage formed in communication with the air supply passages provided for each of the radioactive substance storage chambers, and the air supply-side cask transfer path provided for each of the radioactive substance storage chambers; At least one of an air discharge side cask transfer passage formed by communicating the air discharge passages with each other,
The paired radioactive substance storage chambers are arranged in series, the radioactive substance storage chambers are arranged with the corresponding air discharge passages interposed therebetween, and the respective exhaust passages connected to the paired radioactive substance storage chambers Is connected to a common exhaust tower.

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