JPH10142388A - Cask storage room - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cask storage room superior in moving workability and radiation management capability by moving the cask in a short distance in a reactor power plant with a cask dolly within a structure such as communication path in the case new fuel is mixed oxide fuel and contained in a cask. SOLUTION: In a reactor power plant placing a reactor building 3 setting reactor 2, a large body inlet building 10 for carrying in a large equipment in the reactor building 3 and a cask storage room 17 storing casks 20 containing mixed oxide fuel, the cask storage room 17 is placed nearby the reactor building 3 and in between the cask storage room 17 and the large body inlet building 10 of the reactor building 3, a communication path 18 connecting for delivering the cask is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to storage of nuclear fuel for a nuclear reactor installed in a nuclear power plant, and more particularly, to a cask storage for storing a cask containing new mixed oxide fuel.

[0002]

2. Description of the Related Art In a conventional light water reactor, enriched uranium is used as nuclear fuel for a reactor. As for this enriched uranium fuel, the reactor is usually shut down once every 12 months at the time of the periodic inspection. At this time, about one third of the core is replaced. Therefore, for this refueling, new fuel has been brought into the nuclear power plant in advance, and a new fuel storage has been provided and stored on the site of the nuclear power plant.

[0003] Since this conventional new fuel is enriched uranium fuel, unlike the spent fuel, the new fuel storage does not require special shielding for radiation. Facilities were not provided.
In addition, it was not necessary to store in a special shielding container (Cask, hereafter referred to as a cask) during transportation.

As shown in the plan view of FIG. 17, in a nuclear power plant, a reactor building 3 in which a reactor 2 is installed and a turbine building 4 in which a turbine generator is installed are used as nuclear power plants in a site 1 of the nuclear power plant. And an auxiliary equipment building 5 in which auxiliary equipment is installed, and a seawater pump room 6 for taking in seawater, which is a cooling source for cooling various parts in the plant, are installed as main facilities.

[0005] From the viewpoints of radiation management and protection management, these main facilities have a management area 7 set and arranged collectively in the management area 7 area. In addition, a new fuel storage 8 and a spent fuel cask storage 9 are installed at a location away from the main facility.

In the conventional new fuel storage 8, new fuel transported from outside the site 1 of the nuclear power plant is temporarily stored in the new fuel storage 8 and stored until fuel replacement. At the time of replacement, from the new fuel storage 8 to the reactor building 3, the truck is transported in the site 1 by truck, and is delivered to the first floor in the reactor building 3 from the large cargo entrance building 10 provided in the reactor building 3. You.

[0007] Conventionally, the reactor building 3 has an air-tight structure so as to prevent radioactive substances from being emitted to the outside. For this reason, also in the large cargo entrance building 10, an air lock is formed at the carry-in / out entrance of the large-sized facility equipment. The transported new fuel is removed from the container after the packing is released in front of the air-locked large cargo entrance building 10 or in the large cargo entrance building 10 with the reactor building 3 air-locked. The reactor 2 is loaded in the reactor building 3.

As shown in a plan view of FIG. 18 and a longitudinal sectional view taken along the line AA in FIG. 18 of FIG. 19, fresh fuel 12 loaded on a truck 11 After passing through the airlock door 13 and the airlock door 14 of the reactor building 3 sequentially, it is carried into the reactor building 3 and lifted to the operating floor 15 on the top floor by the reactor building ceiling crane 16, and the fuel (not shown) It is loaded on the reactor 2 by the exchanger.

[0009]

In a light water reactor, it is possible to use a mixed oxide fuel obtained by mixing enriched uranium and plutonium as a new fuel. In this case, however, the mixed oxide fuel must be a new fuel. Even if it is, it needs to be stored in a cask that shields radiation during movement and storage in order to emit some radiation.

The cask storage for storing the cask containing the new mixed oxide fuel needs to be a building having a radiation shielding function in consideration of the cask opening operation and the like. Further, since the cask has an extremely large shape and weight as compared with the contained fuel alone, there is a problem that a large-sized cask trailer is required exclusively for transporting the mixed oxide fuel.

In the case where the new fuel storage 8 is a cask storage and is provided with a radiation shielding function, the mixed oxidizer transported from outside the site 1 of the nuclear power plant by a large cask trailer. The cask containing the new fuel of the raw fuel is temporarily stored in the cask storage.

Thereafter, each time fuel is replaced in the reactor 2 in the reactor building 3, a large cask trailer is generally loaded a distance of about several hundred meters to 1 km from the cask storage to the reactor building 3 each time. And had to be transported. Further, in the reactor building 3, the cask is lifted to the operating floor 15 by a lifting machine such as a reactor building overhead crane 16 or the like. I have to.

Accordingly, the movement of the cask is a long distance,
It is necessary to construct various transport facilities such as cask trailers and pavement roads. Each time, in order to carry the casks out of the management area 7 from the new fuel storage 8 in the site 1, the air lock of each part In order to maintain the air conditioner, the air lock doors 13 and 14 are frequently opened and closed each time. As a result, in the reactor building 3 and the large cargo entrance building 10, due to the radiation control for the passage of the cask, the workability of moving the cask is poor, the burden on the workers is large, and the problem of increasing the exposure opportunity is raised. there were.

An object of the present invention is to move a cask within a nuclear power plant in a short distance within a building such as a communication passage when a new fuel is stored in a cask with a mixed oxide fuel. The object of the present invention is to provide a cask storage excellent in workability and radiation controllability.

[0015]

In order to achieve the above object, a cask storage according to the first aspect of the present invention comprises a reactor building in which a nuclear reactor is installed, and a large-sized building for carrying large-scale equipment into the reactor building. In the cask storage for storing the cask containing the mixed oxide fuel and the loading building, the cask storage is installed near the reactor building, and between the cask storage and the large loading building of the reactor building. A communication passage is provided for communicating the cask in and out.

The cask containing new mixed oxide fuel, which is carried in from the outside of the premises of the nuclear power plant and temporarily stored in the cask storage, is used for refueling in the nuclear reactor. It can be carried into the reactor building without going outside through the large cargo entrance building.

According to a second aspect of the present invention, there is provided a cask storage, comprising: a reactor building in which a nuclear reactor is installed; a large cargo entrance building for carrying large-scale equipment into the reactor building; and a cask containing mixed oxide fuel. In the cask storage for storing the cask storage, the cask storage is installed adjacent to the large cargo entrance building of the reactor building, and a communication opening for cask loading and unloading is provided between the cask storage and the large cargo entrance building. I do.

Since the cask storage is located adjacent to the large cargo entrance building of the reactor building, the cask stored in the cask storage can be moved outside by a short distance when refueling the reactor. Can be brought into the reactor building without being sent out to the reactor building.

According to a third aspect of the present invention, there is provided a cask storage, comprising: a reactor building in which a nuclear reactor is installed; a large cargo entrance building for carrying large-scale equipment into the reactor building; and a cask containing mixed oxide fuel. In the above-mentioned cask storage, the cask storage and the large cargo entrance building of the reactor building are integrated. Since the cask storage is integrated with the large cargo entrance building of the reactor building, the cask stored in the cask storage at the time of refueling of the reactor can be transported within a very short distance without having to go outside. It can be carried into the furnace building.

According to a fourth aspect of the present invention, there is provided a cask storage, wherein a trailer entrance / exit area and a large cargo entrance of a reactor building are also used. Since the trailer entrance / exit area of the cask storage and the large cargo entrance of the reactor building are also used, it is not necessary to secure a dedicated trailer entrance / exit area in the cask storage, and the cask storage can be made compact.

According to a fifth aspect of the present invention, there is provided a cask storage, comprising: a reactor building in which a nuclear reactor is installed; a large cargo entrance building of the reactor building for carrying large-scale equipment into the reactor building; In the cask storage for storing the cask storing the cask, the cask storage is integrally formed as an attached building of a reactor building. Casks containing mixed oxide fuel carried in from outside the premises of the nuclear power plant are stored in the cask storage of the annex building in the reactor building. Can be moved.

According to a sixth aspect of the present invention, there is provided a cask storage for storing two or more nuclear reactor buildings and a cask containing mixed oxide fuel, wherein the cask storage and large-scale loading of each reactor building are carried out. A communication passage for carrying in and out the cask is provided between the entrance buildings.

A cask containing new mixed oxide fuel used in a plurality of nuclear reactor buildings is carried in from outside the premises of the nuclear power plant and temporarily stored in a cask storage. At the time of refueling in the building, the cask storage can be brought into each reactor building without going outside through the cask carry-in / out passage communicating with each reactor building and the large cargo entrance building. .

According to a seventh aspect of the invention, there is provided a cask storage, wherein a cask cart in the cask storage is used for transporting the cask from the cask storage to the reactor building.

In the cask storage, the cask is stored and moved on a traversing child trolley, and the child trolley is mounted on a traveling parent trolley. When moving this cask into the reactor building, the child trolley must be traversed and placed on the parent trolley, and then the parent trolley must travel to move to the large cargo entrance building. The trolley is traversed to pull in.

The cask storage according to the invention of claim 8 is characterized in that an overhead crane of the reactor building is used for transporting the cask from the cask storage to the reactor building. By moving the operation range of the overhead crane of the reactor building from the cask storage to the reactor building, the cask can be moved by the overhead crane of the reactor building without the need for a dedicated cask lifting machine.

According to a ninth aspect of the present invention, there is provided a cask storage for storing a cask containing a spent fuel of enriched uranium fuel and mixed oxide fuel. Spent fuel of enriched uranium fuel generates radiation and heat,
As in the case of the new mixed oxide fuel, it must be stored in a cask for handling. Therefore, the cask containing the spent fuel can be stored in the cask storage and the cask can be moved to the reactor building in the same manner as the case of the mixed oxide fuel new fuel.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. Note that the same components as those of the above-described related art are denoted by the same reference numerals, and detailed description thereof will be omitted. The first embodiment relates to claim 1, claim 7, and claim 9, wherein the cask storage is a plan view of the first floor in the reactor building and the cask storage of FIG. 1 and an arrow in FIG. 1 of FIG. FIG. 1 is a longitudinal sectional view taken along line BB of FIG.
Is shown in a vertical sectional view taken along line CC in FIG.

The cask storage 17 is installed in the vicinity of the reactor building 3, and intersects at right angles with a communication passage 18 for loading and unloading the cask between the large building entrance building 10 provided in the reactor building 3. Is provided. In addition, the cask storage 17 and the large cargo entrance building 10 and the communication passage 18 are all formed of walls around which the radiation is shielded,
Airlock doors 13 and 14 for airlock are provided at the entrance of the large cargo entrance building 10 and the reactor building 3, and an airlock door 19 is provided at a connection portion between the large cargo entrance building 10 and the communication passage 18. Have been.

The cask storage 17 further includes a cask
A cask trailer entrance / exit area 22 where a cask trailer 21 for carrying 20 enters and exits, and a bogie passage 23 orthogonal to the cask trailer entrance / exit area 22 are formed in communication with the communication passage 18. In addition, a cascade hoisting machine 24 communicating with the trolley aisle 23 and the cask trailer access area 22 is installed above the trolley aisle 23, and the trolley aisle 23 and cask storage areas 25 on both sides of the trolley aisle 23 are provided. A cask 20 containing new fuel of mixed oxide fuel mounted on each of the carts 26 is stored (claim 1).

The bogie passage 23 is extended to the large cargo entrance building 10 together with the communication passage 18 and the cask 20
A parent carriage 27 carrying a child carriage 26 equipped with is configured to be able to run freely. In the cask storage 17, the spent fuel cask storing the spent fuel in the reactor 2 is also stored in the same manner as the cask 20 storing the new mixed oxide fuel together with the various facilities. (Claims 7 and 9).

Next, the operation of the above configuration will be described. First, a cask 20 containing fresh mixed oxide fuel transported by a cask trailer 21 from outside the site 1 of a nuclear power plant is placed in a cask trailer access area 22 in a cask storage 17 in a cask hoist 24.
Is lifted by the main bogie in the cask storage area 25
It is lowered onto the child carriage 26 on 27.

The sub-carriage 26 on which the cask 20 is mounted is moved to a predetermined cask storage position in the cask storage area 25 in the cask storage 17 by moving the main carriage 27 to the carriage passage 23. By stopping the parent bogie 27 at a predetermined cask storage position and then traversing the child bogie 26, the cask 20 mounted on the child bogie 26 can be stored at a predetermined location.

By repeating the above moving operation, a large number of casks 20 containing new mixed oxide fuel are stored in the cask storage 17. At this time, the reactor building 3 and the large cargo entrance Airlock door 13 in building 10,
14 and the air lock door 19 of the communication passage 18 is not opened and closed, so that the air lock in the reactor building 3 and the large cargo entrance building 10 is maintained, and since the movement of the cask 20 is a short distance, the work efficiency is improved. The burden and exposure of workers are reduced.

Next, at the time of refueling in the nuclear reactor 2 in the nuclear building 3, for the predetermined cask 20 in the cask storage 17, first, the main bogie 27 is moved to the bogie passage 23 and stopped at the predetermined position. After that, the child trolley 26 stored with the cask 20 mounted thereon is traversed and put on the main trolley 22. The parent bogie 27 is moved in the bogie passage 23 with the child bogie 26 equipped with the cask 20 mounted thereon, and is moved from the cask storage area 25 through the communication passage 18 to the large cargo entrance building 10 in which the airlock door 19 is opened. It enters and stops at the end of the bogie passage 23.

Here, the air lock door 19 is closed and the parent carriage is
27 The child carriage 26 carrying the cask 20 is traversed from above, and the airlock door 14 in the reactor building 3 is opened, and the cask 20 is carried into the nuclear building 3 from the large cargo entrance building 10. Close the airlock door 14.

In the atomic building 3, the overhead crane 16 of the atomic building
The cask 20 is lifted up to the operating floor 15 by using, and a new fuel of the mixed oxide fuel is taken out from the cask 20 and refueling is performed in the reactor 2 by a fuel exchanger (not shown). The child cart 26 returns to the cask storage 17 via the large cargo entrance building 10.

The spent fuel taken out of the reactor 2 at the time of refueling is stored and cooled in a spent fuel pool (not shown) constructed near the reactor 2 for a predetermined period, and then cooled. The new fuel can be stored in the cask storage 17 by being stored in the cask 20 or the like in the reverse process to the loading of the new fuel into the reactor building 3.

As described above, according to the first embodiment, the movement of the cask 20 from the cask storage 17 to the reactor building 3
Reactor building 3 without large cask trailer 21
Reactor building 3 from cask storage 17 installed near
Up to this point, it is possible to move without going outside by passing through the communication passage 18 and the large cargo entrance building 10 and the inside surrounded by the shielding wall.

Further, the moving distance of the cask 20 containing the new fuel of the mixed oxide fuel and the number of steps and the number of transshipment operations are small, so that the efficiency of the moving operation is improved and the burden and exposure of the workers are small. Further, the movement and storage of the spent fuel taken out of the reactor 2 can be carried out with high working efficiency in the same manner as the work for loading the new fuel, and the spent fuel stored in the cask can be transferred to the cask storage 17. Since the storage is easily possible, the operating rate of the cask storage 17 is high.

The second embodiment relates to the second, seventh and ninth embodiments, but the detailed description of the same configuration, operation and effect as those of the first embodiment will be omitted. The differences will be mainly described. The cask storage in the reactor building and the cask storage shown in FIG.
A plan view of the floor, a longitudinal sectional view along the line DD in FIG. 4 in FIG. 5, and a longitudinal sectional view along the line EE in FIG. 4 in FIG. 6 are shown.

The cask storage 28 is installed adjacent to the large cargo entrance building 10 provided in the reactor building 3, and an air lock for carrying in and out the cask 20 and the like at the boundary with the large cargo entrance building 10. A communication opening 29 with a door is provided (claim 2). In addition, a bogie passage 23 is provided between the cask storage 28 and the large cargo entrance building 10 so as to be orthogonal to the large cargo entrance building 10 with the communication opening 29 having the airlock door interposed therebetween. Is the cask trailer access area 22
To form a cask storage area 25.

Further, a cask hoist 24 communicating with a cask trailer access area 22 and a cask storage area 25 is provided above the cask storage 28, and the cask storage area 25 is provided on both sides of the bogie passage 23. A child carriage 26 equipped with a plurality of casks 20 is stored.

It is to be noted that a main bogie 27 on which a child bogie 26 carrying a cask 20 is mounted is provided in the bogie passage 23 so as to be able to run freely, and that a cask storage box 28 can be used for storing spent fuel cask. What is possible is the same as that described in the first embodiment (claims 7 and 9).

Next, the operation of the above configuration will be described. The cask 20 conveyed by the cask trailer 21 from outside the site 1 of the nuclear power plant is hung by the cask hoisting machine 24 on the child carriage 26 in the cask storage area 25 in the trailer access area 22 in the cask storage 28. Get down.

The child bogie 26 on which the cask 20 is mounted can be moved by moving the parent bogie 27 carrying the child bogie 26 in the bogie passage 23, stopping at a predetermined position and then traversing the child bogie 26. The cask 20 mounted on the carriage 26 can be stored in a predetermined storage location in the cask storage area 25. Further, by repeating this, a large number of casks
20 can be stored in a cask storage 28.

At the time of refueling in the atomic building 3, first, the child bogie 26 with the cask 20 mounted thereon is traversed in the cask storage area 25 in the cask storage 28, and
Put it on 27.

Next, the parent carriage 27 is caused to travel in the carriage passage 23,
From the cask storage area 25, through the communication opening 29 with the airlock door, enter the large cargo entrance building 10, stop at the end of the bogie passage 23, and move into the reactor building 3 by traversing the child bogie 26. Let it. In the reactor building 3, the cask 20 is lifted up to the operating floor 15 by the reactor building overhead crane 16 to perform a fuel exchange operation.

In the second embodiment, since the cask storage 28 is provided adjacent to the large cargo entrance building 10 of the reactor building 3, the moving distance of the cask 20 is short.
Therefore, the time required for the movement is short. In addition, the movement of the cask 20 is performed by the parent carriage 27 and the child carriage 26, and the cask trailer 21 is not required. The burden on staff and the exposure are reduced.

The third embodiment relates to the third, seventh and ninth aspects. However, the same components, functions and effects as those of the first embodiment will not be described in detail, and will not be described. The part to be performed is mainly explained. Fig. 7 Cask storage
8 is a plan view of the first floor in the reactor building and the cask storage, a longitudinal sectional view along the line FF in FIG. 7 of FIG. 8, and a line GG in FIG. 7 of FIG. FIG.

The cask storage 30 is formed integrally with the large cargo entrance building 10 provided in the reactor building 3 and an air lock for carrying in and out the cask 20 at the boundary with the large cargo entrance building 10. A communication opening 31 with a door is provided (claim 3). Therefore, the cask storage 30
Is the cask trailer access area 22 and the cask storage area
25 and the large cargo entrance building 10 are integrated and installed adjacent to the reactor building 3.

Further, a cask hoist 24 communicating the cask trailer access area 22 and the cask storage area 25 is provided at the upper part.
Is provided, and a bogie passage 23 is communicated with the cask trailer entrance / exit area 22 and the large cargo entrance building 10 at right angles.

In the carriage passage 23, a parent carriage 27 which can travel freely, and a child carriage 26 in which the cask 20 is mounted on the parent carriage 27.
On both sides of the bogie passage 23 in the cask storage area 25, the cask 20 is stored by arranging a number of child bogies 26 with the cask 20 mounted thereon.

The carriage passage 23 is provided with a parent carriage 27 on which a child carriage 26 having a cask 20 is mounted so as to be able to travel, and the cask storage 30 is used for storing spent fuel casks. What is possible is a configuration similar to that shown in the first embodiment (claims 7 and 9).

Next, the operation of the above configuration will be described. A cask 20 transported by a cask trailer 21 from outside the site 1 of the nuclear power plant is suspended by a cask hoisting machine 24 on a sub-carriage 26 in a cask storage area 25 in a trailer access area 22 in a cask storage warehouse 30. Get down.

The child bogie 26 equipped with the cask 20 allows the parent bogie 27 carrying the cask 20 to travel along the bogie passage 23,
After stopping at a predetermined position, the child trolley 26 is traversed, so that the cask 20 mounted on the child trolley 26 is stored in a predetermined storage location in the cask storage area 25. At the time of refueling in the atomic building 3, the child trolley 26 with the cask 20 mounted thereon is traversed from the cask storage area 25 in the cask storage 30, and is mounted on the parent bogie 27, and then travels along the bogie passage 23. Let it.

The main bogie 27 having passed through the communication opening 31 with the air lock door and entering the large cargo entrance building 10 is stopped at the end of the bogie passage 23 and the child bogie 26 is traversed so as to traverse the reactor building. Move into 3. In the reactor building 3, the cask 20 is lifted up to the operating floor 15 by the reactor building overhead crane 16, and fuel exchange for the reactor 2 is performed.

In the third embodiment, since the cask storage 30 is integrated with the large cargo entrance building 10 of the reactor building 3 and is installed adjacent to the reactor building 3, the cask storage Since the moving distance of the cask 20 from the storage 30 to the reactor building 3 is short, and the time required for the moving is short, the moving workability is excellent. In addition, the movement of the cask 20 is performed by the parent carriage 27 and the child carriage 26, and the cask trailer 21 is not required. The burden on staff and the exposure are reduced.

The fourth embodiment relates to claims 3 and 4, and claims 7 and 9, but has the same structure, operation and effect as those of the above-described first and third embodiments. In the following, the detailed description will be omitted, and the differences will be mainly described. The cask storage is a plan view of the first floor in the reactor building and the cask storage of FIG. 10, a longitudinal sectional view taken along the line HH in FIG. 11 of FIG. 10, and an arrow in FIG. 10 of FIG. This is shown in a vertical sectional view along the line II.

The cask storage 32 has a cask storage area 25.
Cask trailer for cask loading
An airlock door 34 is provided in a cask trailer access area / combined large cargo entrance building 33 communicating with the reactor building 3 and enabling access to the reactor building 3 and is divided by a shielding wall 35 (claims 3 and 4). ).

The cask storage 32 is installed adjacent to the reactor building 3, and an airlock hatch for carrying in and out the cask 20 and the like is provided on the ceiling of the cask trailer access area / combined large cargo entrance building 33. An attached communication opening 36 is provided. Furthermore, in the cask storage area 25,
The cask hoist 24 is installed at the upper part to the upper part of the communication opening 36 with the airlock hatch, and the center is the bogie passage.
At 23, both sides are configured as cask storage areas.

It is to be noted that a main bogie 27 on which a child bogie 26 carrying a cask 20 is mounted is provided in the bogie passage 23 so as to be able to run freely, and that a cask storage 32 is used for storing spent fuel cask. What is possible is a configuration similar to that shown in the first embodiment (claims 7 and 9).

Next, the operation of the above configuration will be described. The cask 20 conveyed from the outside of the site 1 of the nuclear power plant by the cask trailer 21 is connected to the cask trailer entrance / exit area combined large cargo entrance building 33 by the cask hoisting machine 24 with a connection opening 36 with an airlock hatch on the ceiling.
Is dropped onto the child carriage 26 in the cask storage area 25 through

The child trolley 26 on which the cask 20 is mounted can be moved by moving the parent trolley 27 carrying the child trolley 26 on the trolley passage 23 and stopping at a predetermined position and then traversing the child trolley 26. The cask 20 is stored at a predetermined storage location in the cask storage area 25 with the cask 20 mounted. At the time of refueling in the reactor 2 in the nuclear building 3, in the cask storage area 25 in the cask storage 32, the child bogie 26 with the cask 20 mounted thereon is traversed and put on the parent bogie 27. The parent carriage 27 is caused to travel in the carriage passage 23.

At the end of the bogie passage 23, a child bogie 26 with the cask 20 mounted thereon is lifted by a cask hoist 24, and the cask trailer entrance / exit area serving as a large cargo port is passed through a communication opening 36 provided with an airlock hatch on the ceiling. Building 33
Drop it in. Thereafter, the cask 20 is moved into the nuclear building 3 by the child trolley 26, and in the nuclear reactor building 3, the cask 20 is lifted to the operating floor 15 by the reactor building overhead crane 16, and fuel is exchanged for the nuclear reactor 2. .

In the fourth embodiment, the cask storage 32 is integrally formed with the cask trailer entrance / exit area large cargo entrance building 33 which also serves as the cask trailer entrance / exit area and the large cargo entrance building for the reactor building 3. Moreover, it is installed adjacent to the reactor building 3.

This eliminates the necessity of setting up the cask trailer access area and the compactness of the cask storage 32 including the cask trailer access area / combined large cargo entrance building 33. Therefore, the cask storage 32 and the reactor building 3
Since the moving distance of the cask 20 to the cask 20 is short, and the time required for the movement is short, the moving workability is excellent. In addition, since the movement of the cask 20 is performed by the parent carriage 27 and the child carriage 26, the cask trailer 21 is not required, and the cask 20 is carried out without leaving the cask 20, so that the movement work efficiency is improved, and The burden on staff and the exposure are reduced.

The fifth embodiment relates to claims 4 and 5, and claims 8 and 9, but the same configuration, operation and effect as those of the above-described first and fourth embodiments are described. In the following, the detailed description will be omitted, and the differences will be mainly described. The cask storage is a plan view of the first floor in the reactor building and the cask storage of FIG. 13, a longitudinal sectional view taken along line JJ in FIG. 13 of FIG. 13, and an arrow in FIG. 13 of FIG. This is shown in a vertical sectional view along the line KK.

The cask storage 37 is built in the reactor building attachment building 38 which is integrated with the reactor building 3, and is a large-scale combined with a cask trailer access area protruding to the first floor in front of the reactor building attachment building 38. The cabin storage area 25 is installed below the loading entrance building 33 and the internal operating floor 15 (claims 4 and 5).

Further, between the cask trailer entrance / exit area and large-size loading / unloading building 33, the cask storage area 25 and the operating floor 15, the operating range of the reactor building overhead crane 16 is defined as (Claim 8).

The place other than the cask storage 37 in the annex 38 of the reactor building is, for example, an auxiliary equipment room 39 for installing auxiliary equipment in the reactor building 3 and the like. Can be used for storing a spent fuel cask in the same configuration as that described in the first embodiment (claim 9).

Next, the operation of the above configuration will be described. The cask 20 conveyed by the cask trailer 21 from outside the site 1 of the nuclear power plant is carried into the reactor building 3 via the cask trailer entrance / exit area and large-size cargo entrance building 33. Cask 20 is a cask trailer
From the top of 21, the reactor building ceiling crane 16 is lowered into a predetermined storage place in a cask storage area 25 of a cask storage 37, which is installed in a reactor building attachment building 38, and stored.

At the time of refueling in the atomic building 3, the cask storage area 25 of the cask storage 37
The cask 20 is lifted by the overhead crane 16 of the reactor building and lowered onto the operating floor 15 in the reactor building 3. Thereafter, the new fuel in the cask 20 is refueled in the nuclear reactor 2 by a fuel exchanger (not shown).

According to the fifth embodiment, the moving distance of the cask 20 from the cask storage area 25 in the cask storage 37 to the reactor 2 can be set to be extremely short.
The cask trailer 21 is not required to move the cask 20,
In addition, it is possible to move the cask 20 without taking the cask 20 outdoors.

In addition, there is no need to install a dedicated cask hoist 24 for the movement of the cask 20. Further, in the annex 38 of the reactor building, a room other than the cask storage area 25 is used as an auxiliary machine room 39, By moving some or all of the auxiliary equipment installed in the auxiliary equipment building 5 to the auxiliary equipment room 39, the conventional auxiliary equipment building 5 can be reduced or deleted.

The sixth embodiment is based on claims 6, 7 and 9, but differs from the above-described first embodiment in the construction, operation and effect similar to those of the first embodiment by omitting detailed description. The explanation focuses on the parts that do.

As shown in the plan view of the arrangement of the reactor building and the cask storage in FIG. 16, the cask storage 40 is
It is installed near two reactor buildings 3a and 3b provided on the site 1 of the nuclear power plant. Also, the large cargo entrance buildings 9a, 9 provided in the respective reactor buildings 3a, 3b.
b, communication passages 18a and 18b for cask carrying in and out are provided so as to communicate with each other (claim 6).

The truck passages 23 (not shown) provided in the large cargo entrance buildings 9a and 9b and the communication passages 18a and 18b.
Has a parent bogie 27 carrying a child bogie 26 equipped with a cask 20
Is provided so that it can run freely, and the cask storage 40
Is also usable for storing the spent fuel cask in the same configuration as that shown in the first embodiment (claims 7 and 9).

The cask storage 40 and
The configuration of the large cargo entrance buildings 9a and 9b and the communication passages 18a and 18b is shown in the first embodiment. Further, turbine buildings 4a and 4b and auxiliary equipment buildings 5a and 5b are installed around the two reactor buildings 3a and 3b, respectively.

The operation of the above construction is as follows. In the two reactor buildings 3a and 3b, the large cargo entrance buildings 9a and 9b are communicated with the cask storage 40 through the communication passages 18a and 18b. The storage 40 can be shared. Therefore, the cask 20 transported from the outside of the site 1 to the large cargo entrance buildings 9a and 9b by the unillustrated cask trailer 21 is carried into the cask storage 40 via the communication passages 18a and 18b, and the child carriage 26 It is stored in a state of being mounted on.

At the time of refueling in the reactors 2 of the reactor buildings 3a and 3b, the communication passage from the cask storage 40
Via 18a, 18b and large cargo entrance buildings 9a, 9b,
The cask 20 is carried into the reactor buildings 3a and 3b. Thereby, in any case of loading and unloading the cask 20,
The movement of the cask 20 from the cask storage 40 to the reactor buildings 3a and 3b does not require the cask trailer 21 and can be carried out without taking the cask 20 out of the door. Burden and exposure can be reduced.

The above description is based on the two reactor buildings 3a and 3b.
As an example, the number of reactor buildings, the number of large cargo entrance buildings 9a and 9b and the cask storage 40, and the number of communication passages 18a and 18b provided between the reactor buildings 3a and
The number can be appropriately selected depending on the number of bases 3b, the number of cask storages 40, the arrangement on the site 1, and the like.

[0083]

As described above, according to the present invention, when a mixed oxide fuel is used in a nuclear power plant, a new fuel can be easily and safely stored in a cask storage while being stored in a cask. In addition, the transfer to the reactor building is performed by constructing a shield between the cask storage and the reactor building, or through a communication passage or the like that is integrated with the reactor building and is isolated from the outside.

Further, when the cask is moved to the inside of the cask storage and to the reactor building, the cask is mounted on the truck or the reactor building overhead crane, and the cask trailer is not used. Therefore, since the cask can be moved without taking it out, the work efficiency and the radiation controllability are improved, and the burden and exposure of the worker are reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a first floor in a reactor building and a cask storage according to a first embodiment of the present invention.

FIG. 2 is a view according to a first embodiment of the present invention, taken in the direction of arrow B- in FIG. 1;
FIG. 4 is a longitudinal sectional view taken along the line B.

FIG. 3 is a view according to a first embodiment of the present invention, taken along a line C- in FIG.
FIG. 4 is a longitudinal sectional view along the line C.

FIG. 4 is a plan view of a first floor in a reactor building and a cask storage according to a second embodiment of the present invention.

FIG. 5 is a view according to a second embodiment of the present invention, taken along a line D- in FIG.
FIG. 4 is a vertical cross-sectional view along the line D.

FIG. 6 is a view according to a second embodiment of the present invention, taken in the direction of arrow E- in FIG. 4;
FIG. 4 is a longitudinal sectional view taken along a line E.

FIG. 7 is a plan view of a first floor in a reactor building and a cask storage according to a third embodiment of the present invention.

FIG. 8 is a view according to a third embodiment of the present invention, taken along arrow F- in FIG. 7;
FIG. 4 is a longitudinal sectional view along the line F.

FIG. 9 is a view according to a third embodiment of the present invention, taken in the direction of arrow G- in FIG. 7;
FIG. 4 is a longitudinal sectional view along the G line.

FIG. 10 is a plan view of a first floor in a reactor building and a cask storage according to a fourth embodiment of the present invention.

FIG. 11 is a longitudinal sectional view taken along line HH in FIG. 10 according to a fourth embodiment of the present invention.

FIG. 12 is a longitudinal sectional view taken along a line II in FIG. 10 according to a fourth embodiment of the present invention;

FIG. 13 is a plan view of a first floor in a reactor building and a cask storage according to a fifth embodiment of the present invention.

FIG. 14 is a longitudinal sectional view taken along the line JJ of FIG. 13 according to a fifth embodiment of the present invention.

FIG. 15 is a longitudinal sectional view taken along the line KK of FIG. 13 in a fifth embodiment according to the present invention.

FIG. 16 is a plan view showing an arrangement of a reactor building, a cask storage, and the like of a nuclear power plant according to a sixth embodiment of the present invention.

FIG. 17 is a plan view showing an arrangement of a new fuel storage, a spent fuel cask storage, and the like of a conventional nuclear power plant.

FIG. 18 is a plan view of the first floor of a conventional reactor building.

19 is a view showing a conventional reactor building viewed from the direction of arrow A- in FIG. 18;
FIG. 4 is a vertical cross-sectional view along the line A.

[Explanation of symbols]

1: Nuclear power plant premises, 2: Nuclear reactor, 3, 3
a, 3b: Reactor building, 13, 14, 19, 34 ... Air lock door, 4, 4a, 4b ... Turbine building, 5, 5a, 5b ...
Auxiliary equipment building, 6 Seawater pump room, 7 Management area, 8 New fuel storage, 9 Spent fuel cask storage, 10, 10a,
10b: Large cargo entrance building, 11: Truck, 12: New fuel, 15
... Operating floor, 16 ... Reactor building overhead crane, 17,28,30,32,37,40 ... Cask storage, 18,18
a, 18b: communication passage, 20: cask, 21: cask trailer, 22: cask trailer access area, 23: bogie passage,
24… Cask hoisting machine, 25… Cask storage area, 26… Child bogie, 27… Parent bogie, 29, 31… Communication opening with airlock door,
33… Casco trailer access area combined large cargo entrance building, 35
... shielding wall, 36 ... communication opening with airlock hatch, 38 ... reactor building attached building, 39 ... auxiliary equipment room.

Claims (9)

[Claims] 1. A cask storage in a reactor building in which a nuclear reactor is installed, a large cargo entrance building for carrying large-sized equipment into the reactor building, and a cask storage for storing a cask containing mixed oxide fuel. A cask storage, characterized in that a storage is installed near the reactor building and a communication passage is provided between the cask storage and the large cargo entrance building of the reactor building for communicating casks in and out. 2. The cask storage in a reactor building in which a nuclear reactor is installed, a large cargo entrance building for carrying large-scale equipment into the reactor building, and a cask storage for storing a cask containing mixed oxide fuel. A cask storage, wherein a warehouse is installed adjacent to a large cargo entrance building of a reactor building, and a communication opening for cask loading / unloading is provided between the large warehouse entrance building. 3. The cask storage in a reactor building in which a nuclear reactor is installed, a large cargo entrance building for carrying large-scale equipment into the reactor building, and a cask storage for storing a cask containing mixed oxide fuel. A cask storage, characterized by the integrated structure of the warehouse and the large cargo entrance building of the reactor building. 4. The cask storage according to claim 3, wherein the cask storage serves both as a trailer entry / exit area and a large cargo entrance of a reactor building. 5. The cask storage in a reactor building in which a nuclear reactor is installed, a large cargo entrance building for carrying large-scale equipment into the reactor building, and a cask storage for storing a cask containing mixed oxide fuel. A cask storage facility characterized by the fact that the storage is integrated with the reactor building attached building. 6. A cask storage for storing a cask containing two or more reactor buildings and a mixed oxide fuel,
A cask storage, wherein a communication passage for carrying in and out a cask is provided between the cask storage and a large cargo entrance building of each reactor building. 7. The cask storage in the cask storage, wherein a cask cart in the cask storage is used for loading and unloading a cask from the cask storage to a reactor building. 6. Cask storage according to 6. 8. The cask storage, wherein an overhead crane of the reactor building is used for carrying in and out of the cask from the cask storage to the reactor building.
Cask storage as described. 9. A cask storing a spent fuel of enriched uranium fuel and mixed oxide fuel in said cask storage.
Cask storage as described.