JPS5934996B2 - Dripping liquid collection and processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for cleaning a receiver that collects liquid dripping from a contaminated object, and in particular to a device for cleaning and treating a receiver that collects liquid dripping from a contaminated object, and in particular, to a device for cleaning and treating a receiver that collects liquid dripping from a contaminated object, and in particular to a device for cleaning and treating a receiver that collects liquid dripping from a contaminated object. Apparatus suitable for collecting and cleaning collected sodium and collection containers.

Hereinafter, the case where the contaminated object is spent nuclear fuel with adhering sodium will be explained as an example, but the same can be considered when the contaminated object is other things, such as laboratory instruments.

The device for transferring spent fuel with adhering sodium contains the spent fuel from below into the transfer device using a transportation mechanism consisting of a spent fuel gripping device and its driving part, and the device is kept airtight by a door valve. It has become.

In such a transfer device, a saucer is placed on the door valve to collect sodium dripping from the spent fuel.

By the way, spent fuel needs to be forcibly cooled with inert gas to remove decay heat, but as a result of this, the sodium adhering to the fuel is scattered.

For this reason, the tray needs to be larger than the guide tube through which the fuel and its gripping device pass, making it difficult to handle the tray with the gripping device.

Conventionally, a worker directly removes the sodium-filled saucer from the side of the door valve and cleans it.

As described above, with the conventional method, it is not easy to maintain the tray by removing it, cleaning it, and installing it, and since sodium is radioactive, such operations must be avoided from the standpoint of radiation exposure.

SUMMARY OF THE INVENTION An object of the present invention is to provide a dripping liquid collection and processing device that can transport, clean, and replace liquid dripping from a contaminated object and its receiver by remote control, and has excellent maintainability. be.

That is, the present invention is equipped with a conveying mechanism consisting of a gripping device for a contaminated object and a driving section thereof, a storage section that can accommodate the contaminated object through a lower end opening by the conveying mechanism, and an upper end opening by the conveying mechanism. a cleaning section capable of housing therein a receiver for dripping liquid from a contaminated object through an opening, and comprising an introduction pipe for a cleaning treatment medium for the liquid and a drain pipe for waste gas or waste liquid; The accommodating section is movable to a position where the lower end opening of the accommodating section communicates with the upper end opening of the washing section, and a door valve is installed at each of the openings, and at least the door valve of the accommodating section can be moved to a position where the lower end opening of the accommodating section communicates with the upper end opening of the washing section. In any case, said liquid receiver is mountable, said receiver being provided with a handling head that engages said gripping device, said liquid receiver being capable of handling dripped liquid collected in said receiver in said receptacle by means of a conveying mechanism. This is a dripping liquid collection and processing device in which the container is transported to a cleaning section and cleaned there, allowing the container to be reused.

Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is an explanatory diagram showing one embodiment of the present invention, and shows a case where the invention is applied to a dripping sodium collection and processing device.

The dripping sodium collection and processing device consists of a spent fuel transfer device 1, which is a contaminated object storage section, and a dripping sodium tray cleaning device 2.

Spent fuel from fast reactors is extracted from the sodium coolant and transported to a fuel cleaning facility where it is cleaned.

Spent fuel has sodium attached to it, and this spent fuel also has radioactivity and decay heat, so when transporting spent fuel, it must be forcibly cooled by creating an inert gas atmosphere, and a shield must be installed. It needs to be covered with.

The spent fuel transfer device 1 includes a lead cask 5 mounted on a cart 4 equipped with wheels 3, and a lower end opening 6 of the cask 5.
is provided with a first door valve 7, which can be opened and closed by a first door valve drive section 8.

A gripping device 10 for the spent fuel 9 and a drive section 11 thereof are provided on the upper part of the cask 5, and a cooling system in which a cooler 12 and a blower 13 are connected via piping is further provided in the cask 5.

Therefore, the spent fuel transfer device 1 can freely transfer the spent fuel 9 contained therein to any desired location.

The lead cask 5 shields radiation from the spent fuel 9,
A cooling system consisting of a cooler 12 and a blower 13 removes the decay heat of the spent fuel 9 by forcibly circulating inert gas.

The interior of the lead cask 5 can be maintained in an inert gas atmosphere by a door valve 7.

The conveying mechanism consisting of the gripping device 10 and its driving section 11 is as follows:
It performs the operations of grasping, lifting, holding, suspending, and releasing the spent fuel 9.

A sodium tray 14 is placed on the upper surface of the door valve 7 to collect the dripping sodium.

This sodium saucer 14 can be left in place regardless of whether the door valve 7 is opened or closed.

An example of this sodium saucer 14 is shown in FIGS. 2 and 3.

The sodium saucer 14 consists of an outer drip saucer 15 and an inner drip saucer 16 that is locked on the inside of the outer drip saucer 15. On the upper periphery of the inner drip saucer 16, a thin plate is formed to accumulate sodium in the direction of the upward force. It has a structure in which a handle 17 is provided, and a handling head 18 that can be attached to the gripping device 10 is provided at the center of the upper part.

The outer diameter of the outer drip tray 15 is larger than the outer diameter of the guide tube 19 inside the cask 5.

This was done in consideration of the scattering of the dropped sodium due to the forced circulation of inert gas.

Although a larger amount of sodium from the spent fuel 9 drips into the inner drip tray 16 than the outer drip tray 15, the amount of sodium dripped into the inner drip pan 16 is further increased by the sodium accumulator 17, and the outer drip pan 15 is cleaned.・Replacement operations can be omitted.

In addition, the guide tube 1 inside the cask 5 is attached to the inner drip tray 16.
Key grooves 20 are provided in two directions so as to be easily guided by the keys 9.

Next, the dripping sodium tray cleaning device 2 will be explained. This device mainly consists of a cask 25 made of lead and a cask lifting device 30 located below the cask 25.

A second door valve 27 is provided in the upper end opening 26 of the lead cask 25, which is connected to a second door valve drive 28.
It can be opened and closed freely.

Furthermore, a steam/inert gas supply line 3 is provided for replacing the inside of the cask 25 with inert gas and cleaning the dripping sodium tray.
1, a desalinated water supply line 32, and a waste gas/waste liquid drain line 33 are connected.

A plurality of used inner drip trays 16 can be stored in the cask 25, and the inner drip tray 16 can also be placed on the second door valve 27.

When transferring the spent fuel 9, only the spent fuel transfer device 1 is required as in the conventional case, and the dripping sodium tray cleaning device 2 is not required at all.

The spent fuel 9 is accommodated and held in a lead cask 5 by a gripping device 10 and its drive unit 11, and is held by a door valve 7.
It is transported with the door fully closed.

As previously mentioned, a dripping sodium receptacle 14 is located on the door valve 7, by which the dripping sodium is collected.

Once the spent fuel 9 has been transferred to a predetermined location, the door valve 7 is opened by the door valve and drive unit 8, and the spent fuel 9 is transferred to the predetermined location.
The operation of suspending and releasing is performed.

The spent inner drip tray 16 is taken out and cleaned after such spent fuel 9 is handled.

First, after positioning the spent fuel transfer device 1 on the dripping sodium tray cleaning device 2, the cask lifting device 30 raises the lead cask 25 of the dripping sodium tray cleaning device 2 to connect the two.

A gasket 35 is provided in advance at the connection portion, and the gasket 35 seals the connection portion.

The operation of storing the used inner dripping tray 16 containing sodium into the dripping sodium tray cleaning device 2 is carried out by the gripping device 10.
This is performed by the drive unit 11 thereof.

That is, with both door valves 7.27 fully closed, the used inner drip tray 16 is grabbed by the gripping device 10, and
After rising along the guide tube 19, the double door valve 7.2
7 are fully opened, the gripping device 10 is lowered into the lead cask 25 of the dripping sodium tray cleaning device 2, and the used inner drip tray 16 is stored in the cask 25.

The gripping device 10 is placed again on the cask 5 of the spent fuel transfer device 1.
After storing the dripped sodium tray in the container, the door valve 27 of the dripped sodium tray cleaning device 2 is fully opened, and the new circle side drip tray 16a prepared above the door valve 27 is grabbed and lifted up by the gripping device 10.

Next, the door valve 7 of the spent fuel transfer device 1 is fully closed, and the new (cleaned) fuel is lifted by the gripping device 10.
The inner drip pan 16a is suspended into the outer drip pan 15 above the door valve 7 of the spent fuel transfer device 1.

Thereafter, the gripping device 10 is raised to the upper limit.

The above-described operations complete the exchange of the used inner drip tray 16 with the new inner drip tray 16a.

On the other hand, the used inner drip tray 16 accommodated in the dripping sodium pan cleaning device 2 is transferred to the steam/inert gas supply line 3.
1. Steam/desalted water cleaning is performed using the desalted water supply line 32 and waste gas/waste liquid drain line 33 to dispose of accumulated sodium.

The used inner drip tray 16 after cleaning is the new circle side drip tray 16
Reuse as a.

Note that it is preferable to place the new circle side drip tray 16a on the door valve 7 of the dripping sodium tray cleaning device 2 as in this embodiment, since the time for replacing the used inner drip tray 16a can be shortened. .

If the structure of the dripping sodium saucer 14 is separated into the outer dripping saucer 15 and the inner dripping saucer 16 as in the above embodiment, and the sodium accumulator 17 is provided on the inner dripping saucer 16,
Most of the sodium from the spent fuel 9 can be stored in the inner drip pan 16, and the outer drip pan 15 can require almost no maintenance.

An embodiment in which the contaminated object is spent fuel with adhering sodium has been described above, but as mentioned above, the present invention is not limited to this, but can also be applied to the collection and treatment of liquid dripping from other contaminated objects. can also be applied.

The present invention is a dripping liquid collection and processing device configured as described above, in which the dripping receiver is provided with a handling head and can be freely transported by a gripping device and its drive unit, so that it is free from contamination. It is possible to transport, clean, replace, etc. smoothly and easily by remote control the liquid dripping from an object that is dripping, and the container for the same. This greatly improves the maintainability of the drip tray and allows work to be carried out safely. It has excellent effects such as

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an explanatory diagram showing one embodiment of the apparatus according to the present invention, Fig. 2 is a longitudinal sectional view of the dripping sodium receiving tray, and Fig. 3 is a plan view thereof.

1...Spent fuel transfer device, 2...Dripping sodium tray cleaning device, 5...Lead cask, 6...Lower end opening, 7. ...First door valve, 9...Spent fuel, 10...
...Gripping device.

11... Gripping device, drive unit, 14...
Dripping sodium saucer, 15...Outer dripping saucer,
16, 16a...Inner drip pan, 17...
...Sodium accumulator, 18...Handling head, 25...Lead cask, 26...
...Top opening, 27...Second door valve,
30... Cask lifting device, 31...
Steam/inert gas supply line, 32... Desalinated water supply line, 33... Waste gas/waste liquid drain line.

Claims (1)

[Scope of Claims] 1. A container equipped with a conveying mechanism consisting of a gripping device for a contaminated object and a driving part thereof, and a storage section in which the contaminated object can be accommodated through a lower end opening by the conveying mechanism, and the conveying mechanism A cleaning section capable of housing therein a receiver for dripping liquid from the contaminated object through the upper end opening, and comprising an inlet pipe for a cleaning treatment medium for the liquid and a drain pipe for waste gas and waste liquid. The accommodating section is movable to a position where the lower end opening of the accommodating section communicates with the upper end opening of the washing section, and both openings are provided with door knobs and lubricants, respectively. The door valve is capable of carrying the liquid receiver regardless of whether the door valve is open or closed, and the liquid receiver is provided with a handling head that engages with the gripping device, and the liquid is collected in the receiver in the receiving part. A dripping liquid collection and processing device in which dripped liquid is carried into a washing section for each receiver by a transport mechanism and cleaned there, so that the receivers can be reused. 2. The device according to claim 1, wherein the door valve of the washing section is also structured so that a liquid receiver can be placed therein regardless of whether the door valve is opened or closed, so that a plurality of liquid receivers can be used alternately. 3. The apparatus according to claim 1 or 2, wherein the contaminated object is a nuclear reactor fuel assembly to which liquid sodium has adhered.