JPS61160095A - Reactor spent fuel transfer equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed description of the invention [Technical field to which the invention pertains] The present invention relates to a nuclear reactor facility in which spent fuel taken out from a nuclear reactor is transferred to a cleaning tank for cleaning, and after cleaning is transferred to a water pool. - Concerning spent fuel transfer equipment for nuclear reactors that are stored therein.

[Prior art and its problems]

At nuclear reactor facilities, spent fuel taken out of the reactor is stored in an ex-core fuel storage tank for a certain period of time, cooled, and then taken out from the ex-core fuel storage tank, undergoes processes such as washing the fuel, and is stored in a storage water pool. After being sufficiently cooled here, it is placed in a cask and transported outside the facility.

On the other hand, new fuel brought in from outside the plant undergoes a predetermined inspection at the new fuel receiving and storage facility, and when the spent fuel is removed, it is transferred and loaded into the reactor to replace it. For this purpose, an extra-core fuel storage layer is provided between the reactor vessel and the above-mentioned fuel reception and fB output storage facilities that communicate with the outside.

Fuel handling equipment is installed in which various types of fuel equipment, such as fuel cleaning equipment, are installed, and fuel is transferred between these equipment using a fuel transfer machine.

Next, FIG. 1 shows the conventional configuration of the above-mentioned fuel handling equipment. In the figure, 1 is the reactor vessel installed in the reactor containment vessel 2, 3 is the spent fuel storage facility inside the fuel storage seat leading to the outside, and 4 is the fuel storage water pool. Along the fuel handling path connecting the container 1 and the fuel storage water boule 4, there is an extra-core fuel storage tank 5, a fuel cleaning device 7 disposed in a cleaning viate 22 in an inert gas atmosphere, An underground truck 8 and the like for carrying in new fuel is installed to connect the new fuel receiving and storage facility (not shown). Note that 9 is a fuel IvJf port with a floor door valve that connects each of the above-mentioned equipment and the floor.

On the other hand, on the side of the storage facility mentioned above, there is an underwater trolley 1 inside the water pool.
0. Storage 11. A fuel transfer machine, cask cleaning equipment 15, etc., which run while covering the cask loading pit 12 with a water pool, are provided.

Note that 16 indicates a spent fuel transport cask loaded on a truck.

Further, the fuel transfer between the reactor vessel l and the ex-core fuel storage layer 5 described above is carried out by a fuel transfer cell 17 constructed as a hot cell with an inert gas atmosphere in the containment vessel 2. This is done by the transfer machine 18. On the other hand, the transfer of fuel between the fuel facilities outside the containment vessel is performed by a cask car field running in the cask car passage of the transfer vehicle 4 which is in an air atmosphere. The cask cars that travel along the cask car path are equipped with a fuel container cylinder called a coffin, which has a function to absorb radiation.

As mentioned above, the fuel receiver of the spent fuel submersible cart 10 is transferred to the ferry port and loaded onto the submersible cart 10, and the submersible cart 10 transfers the fuel to the pool transfer device 13 as a fuel transfer device. The receiver travels to the crossing point and is stored in the storage basin 11 of the water pool 4 by the pool transfer machine 13.

The spent fuel transfer equipment described above requires complicated procedures such as passing an underwater trolley between the fuel cleaning equipment and the storage tank in the water pool, and therefore requires a large number of equipment. There is also the problem that it takes a long time to transfer the fuel.

[Purpose of the invention]

In view of the above-mentioned points, an object of the present invention is to rationally simplify the fuel handling procedure from the spent fuel cleaning equipment to the water pool, and to provide a simple and compact spent fuel transfer equipment. .

[Summary of the invention]

According to the present invention, the spent fuel taken out from the nuclear reactor is transferred to the transfer chamber arranged along the fuel handling path and the fuel receiver arranged in the cleaning pit, which is connected via the transfer port. In a spent fuel transfer facility in which fuel is transferred to a cleaning device, and after cleaning is transferred to a water pool in a water pool room for storage, and separate fuel transfer devices are provided for these transfers, the fuel cleaning device is pivoted in the vertical direction. The cleaning tank is provided along the rotation axis on an arm provided laterally from the rotation axis.
This fuel cleaning device is arranged below the bottom of the water pool and so as to span the transfer chamber above and the water pool,
A first passage is provided that vertically penetrates between the ceiling of the washing pit and the floor of the air chamber.

A first gate valve is provided at the opening of the transfer base of the first passage, while the opening of the washing pit ceiling is opposed to the fuel inlet/outlet of the washing tank, and further between the washing pit ceiling and the bottom of the water pool. a second passage vertically penetrating the
This is accomplished by providing a second gate valve at the opening of the upper valve for cleaning the passageway, and a retractable pipe that can be watertightly connected to the fuel inlet/outlet of the cleaning tank below the gate valve.

[Embodiments of the invention]

The present invention will be described in detail below based on the drawings.

FIG. 1 is a structural layout diagram of a spent fuel transfer facility according to an embodiment of the present invention. In FIG. 1, the same parts as in the conventional example shown in FIG. 2 are given the same reference numerals.

In FIG. 1, a cask car I serving as a fuel transfer device is installed in a transfer chamber 21 in an air atmosphere to transfer spent fuel taken out from a nuclear reactor. The fuel cleaning device 7 constitutes a rotary transfer type fuel cleaning device in which a cleaning tank 7 is provided along the rotating shaft 7a on an arm 7b provided laterally from a rotating shaft 7a supported in the vertical direction. It is arranged in an atmospheric cleaning pit 4. In the water pool room B, there is a water pool 4 in which a storage tank 11 for storing spent fuel is installed underwater.
A pool transfer machine 13 is provided as a fuel transfer machine that travels covering the water pool 4 and transfers the spent fuel.

The fuel cleaning device 7 is located below the bottom of the water pool 4.
In addition, a cleaning pit η is provided so as to straddle the upper transfer chamber 21 and the water pool 4. A first road is provided that vertically penetrates the ceiling of the washing pit 22 and the floor of the transfer chamber 21, and a first gate valve is installed at the fuel delivery port, which is an opening in the floor of the transfer chamber 21 in the first passage. As a floor door pulp δ is provided, while a cleaning pit or a ceiling opening 24b is provided.
is opposed to the fuel inlet/outlet lower d of the cleaning tank 7c. NaS
A guide pipe is inserted into the first passage U, and the opening M30Y is provided near the fuel inlet/outlet lower d.

On the other hand, a second passage station is provided that runs vertically between the bottom of the water pool 1 and the ceiling of the cleaning pit n, and an M2 gate valve is installed at the opening in the ceiling of the cleaning pit 22 where the second passage is connected. A door valve 27 is provided as a door valve 27, and a bellows row consisting of a telescopic pipe, for example, a double bellows, is attached below the door valve 27, and a sealing material is interposed on the lower end face of the bellows row at the fuel inlet/output lower d of the cleaning tank 7C. I try to make it watertight. Then, pressure is applied between the double bellows to extend the bellows row, and the sealing material brings the bellows path into contact with the fuel inlet/outlet lower d to make it watertight. Further, the pressure is reduced between the two l bellows to retract the bellows, thereby separating the bellows row from the fuel inlet/outlet lower d, etc., thereby making it possible to rotate the rotating shaft of the dJa rough washing # device 7.

A door valve 29 is also provided at the bottom opening of the water pool 4 in the second passage A, and a door valve 26. 4 prevents a large amount of water from leaking out of the water pool 4 even if one of the door valves is damaged.

In addition, the water pool section and storage section connected to the second passage A,
1 is connected to the water pool part where the water passage 4a is arranged,
A water gate 4b is provided in the water passage 4a.

Even if a failure occurs in the above-mentioned door valve, etc., the water gate 4b can be closed and this area partitioned off to remove water, making it possible to carry out repairs, etc., as well as a water pool equipped with a storage well 11. The tank is filled with water and can maintain spent fuel cooling and radiation shielding functions.

Next, the spent fuel transfer procedure will be explained.

The cask car 20, which runs with spent fuel stored in the coffin, stops at the position of the floor door pulp δ, and after joining the floor door valve δ and the coffin of the cask car, opens the floor door valve δ and waits at the opening 24b. Cleaning tank 7CIC
The spent fuel is suspended and transferred through the first road.

After the transfer is complete, close the floor door valve. And cleaning tank 7
After the spent fuel has been cleaned at step C, the door valve is kept watertight with the fuel inlet/outlet lower d by the rotation of the rotary shaft 7a, and the water passage 4a has a water gate 4b which is always open.
, and is placed on storage rack 11 and stored. After the transfer is completed, the door valve n, 29 is closed, the bellows row is retracted, and the rotating shaft of the fuel cleaning device can be rotated.

Then, by rotating the first road, another opening is cleaned 41y.
7c and the above transfer process is repeated.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the fuel cleaning device is a rotary transfer type fuel cleaning device, which is installed below the lower surface of the water pool and spanning the upper transfer chamber and the water pool. The rotation axis of the fuel cleaning device is easily This makes it possible to transfer spent fuel from the transfer room to the water pool room, eliminating the need for the underwater trolley of the prior art.This also eliminates the need for cask cars to transfer the spent fuel to the underwater trolley, greatly streamlining the fuel handling equipment. This has the effect of significantly shortening the spent fuel handling procedure and therefore the handling time.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a spent fuel transfer facility according to an embodiment of the present invention, and FIG. 2 is a configuration diagram of a fuel handling facility equipped with a conventional spent fuel transfer facility. 4: Water pool, 7: Fuel cleaning device, 7a: Rotating shaft, 7h
: Arm, 7C: Cleaning tank, 13: Pool transport machine as a fuel transfer machine, 20: Cask car as a fuel transfer machine,
21: Transfer chamber, 22: Washing pit j1゜23: Water boule display, 24: First passage, 25: First gate valve, 26: Second passage, 27: Second gate valve, Fig. 1

Claims (1)

[Claims] The spent fuel taken out from the reactor is transferred to a fuel cleaning device installed in a cleaning pit that is connected via a fuel delivery port to a transfer chamber arranged along a fuel handling path, and after cleaning is transferred to the transfer chamber. In a spent fuel transfer facility for a nuclear reactor, in which the spent fuel is transferred to a water pool in an adjacent water pool room and stored, and each fuel transfer device is provided for the transfer, the fuel cleaning device has a rotary shaft supported in a vertical direction. A washing tank is provided along the rotation axis on an arm provided laterally from the fuel washing device, and the fuel washing device is placed below the bottom of the water pool and straddles the transfer chamber above and the water pool. A first passage vertically penetrating between the ceiling of the washing pit and the floor of the transfer chamber is provided, and a first gate valve is provided at an opening in the transfer chamber floor of the first passage. furthermore, a second passage is provided that vertically penetrates between the ceiling of the cleaning pit and the bottom of the water pool, and the opening of the cleaning pit ceiling is opposed to the fuel inlet/outlet of the cleaning tank; A nuclear reactor characterized in that a second gate valve is provided at the opening in the ceiling of the cleaning pit in the passageway, and an expandable pipe that can be connected watertightly to the fuel inlet/outlet of the cleaning tank is provided below the gate valve. spent fuel transfer equipment.