JPH0333240B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD OF THE INVENTION The present invention relates to an agitator handling device for a radioactive waste liquid storage container.

[Technical background of the invention and its problems]

Generally, radioactive waste liquid storage containers (hereinafter referred to as storage containers) store waste fats and waste liquids such as radioactive waste resins and powdered fats generated during the operation of nuclear reactors.

This waste liquid is gradually stored for 20 to 30 years until the storage container is full.

When disposing of the waste liquid that has become full in this manner, the waste liquid is gradually removed from the storage container and subjected to radioactivity reduction treatment using a radioactive waste liquid treatment device over a period of about half a year.

On the other hand, due to the difference in weight, waste fat and waste liquid accumulate in the storage container in two layers: at the bottom and at the top. Therefore, during the radioactive waste liquid treatment time, a stirrer is inserted into the storage container to uniformly mix the waste liquid, waste fat, etc., and the waste liquid, etc. is taken out.

Conventional methods for stirring waste liquid, etc. in storage containers include Japanese Patent Application Laid-Open No. 56-109000;
The methods described in Japanese Patent Application Laid-open No. 53-34100 and Japanese Patent Publication No. 58-23600 have been proposed.

However, in the method described in JP-A-56-109000, the stirrer is immersed in waste liquid, etc., and is taken out and stored outside the storage container without being washed. Therefore, it is necessary to shield the stirrer from radiation. Therefore, a large-scale operation trolley was required. In addition, the above-mentioned Japanese Patent Publication No.
In the method described in Japanese Patent No. 53-34100, the stirrer taken out of the storage container is cleaned by directly spraying cleaning water, which has the disadvantage that radioactive materials are scattered. In addition, the above-mentioned special public service 1983-
The method described in Japanese Patent No. 23600 cleans the storage container by spraying washing water onto the agitator, but it is necessary to attach a cleaning device to each of the many storage containers.

In addition, conventionally, a device has been proposed in which a stirrer storage cask is provided that stores and covers the stirrer outside the storage container and is moved together with the stirrer. This requires additional equipment and is expensive.

In addition, the stirrer must be inspected periodically during long-term operation over half a year, but since the stirrer storage cask cannot be disassembled, it is difficult to clean the internal stirrer at an inspection and cleaning site. In order to facilitate this cleaning and inspection work, a large work space should be provided between the agitator and the agitator storage cask, but on the other hand, the agitator storage cask is very large, for example at least twice the size of the agitator. It was impossible to effectively utilize the space in the reactor building. There was also the possibility that workers would be exposed to radiation.

[Purpose of the invention]

The present invention has been made in view of these points, and it is possible to reliably clean the stirrer with one cleaning device without providing cleaning devices in each of a large number of storage containers, and the cost is low. This agitator handles radioactive waste liquid storage containers, which can prevent radioactive contamination, and can be disassembled and reassembled to reduce the size of the entire device, make effective use of space, and facilitate cleaning and inspection work. The purpose is to provide equipment.

[Summary of the invention]

The stirrer handling device for a radioactive waste liquid storage container of the present invention includes a stirrer that performs a stirring action in the radioactive waste liquid storage container, and a bottom lid that houses the stirrer so as to be freely accessible through a lower opening that can be opened and closed. an agitator storage cask that can be placed on a pedestal formed around the opening of the upper lid of the storage container; and an agitator storage cask that is provided within the agitator storage cask and that is connectable to an external cleaning liquid supply section. A cleaning mechanism for cleaning the machine, a stirring machine housed in the stirring machine storage cask, and moving the stirring machine in the horizontal and vertical directions together with the stirring machine storage cask,
The apparatus is provided with a transport mechanism that can lower the agitator from within the agitator housing cask or pull it up into the agitator housing cask when the agitator housing cask is placed on the pedestal.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows a storage container section equipped with the device according to the invention, and FIG. 2 shows details of the device according to the invention.

In the figure, reference numeral 1 indicates a concrete frame, and a large number of storage containers 2, 2 are arranged in parallel inside the concrete frame. An inner lining 2a is attached to the inner surface of the storage container 2, and an opening 2c is provided in the center of the upper lid 2b, which is formed around a pedestal 3. Further, the opening 2c of the concrete frame 1
An opening 1a is bored directly above the concrete hatch 4, which allows the agitator storage cask 10 to pass therethrough. A transport mechanism 6 is provided on the ceiling 5 above the opening 1a. This transport mechanism 6 is formed by a monorail 7 attached to the ceiling and a crane 8 that moves along this monorail 7, and a wire 8a suspended from the crane 8 is connected to the top wall of the agitator storage cask 10. It is inserted through a hole 10a formed in the hole 10a, and its lower end is attached to the stirrer 9 so as to be connectable thereto. Therefore, when the agitator 9 is lifted by the crane 8, the agitator 9 and the wire 8a
The connecting portion engages with the top wall of the agitator storage cask 10, and the two become one, so that the agitator storage cask 10 can be moved horizontally and vertically together with the agitator 9 by operating the crane 8. On the other hand, when the stirrer 9 is lowered together with the stirrer storage cask 10 and the stirrer storage cask 10 is placed on the pedestal 3 as shown by the solid line in FIG. separated from Therefore, only the agitator 9 can be lowered further or the agitator storage cask 10 can be accessed from below.
can be raised to

Guide rollers 9a, 9a are protruded from the top, bottom, left and right of the stirrer 9, respectively. Guide rails 11, 11 guide the guide rollers 9a, 9a to allow the stirrer 9 to move up and down in a stable manner.
are provided in the storage container 2 directly below the opening 2c in the vertical direction. Each guide rail 11 has extension members 12, 1 stretched between them and the inner wall surface of the storage container 2.
It is held in position by 2. Further, the stirrer storage cask 10 has a square box shape that covers the stirrer 9 and can be placed on the pedestal 3,
When the stirrer storage cask 10 is placed on the pedestal 3, when the bottom cover 13 at the lower end is opened, the stirrer 9 is inserted into the guide rail 11 from the lower opening 10b.
It is designed to guide you in the direction of. Additionally, inside the agitator storage cask 10, there is a cleaning mechanism 1 consisting of cleaning piping, nozzles, etc. that sprays cleaning water at two locations, upper and lower, toward the agitator 9 housed inside.
4 is provided. This cleaning mechanism 14 is formed so as to be freely connectable to a cleaning liquid supply section 15 consisting of piping and the like provided outside the agitator storage cask 10.

Next, the operation of this embodiment will be explained.

In the storage container 2, as shown in FIG. 1, waste fat 16 is stored in the lower layer and waste liquid 17 is stored in the upper layer.
To perform waste liquid treatment, first, the wire 8a of the crane 8 is tied to the concrete hatch 4, the concrete hatch 4 is lifted by the crane 8 and placed on the concrete frame 1, and the opening 1a is opened.

Next, the wire 8a of the crane 8 is removed from the concrete hatch 4, and the stirrer 9 placed in the storage position is
pass through the hole 10a of the agitator storage cask 10, and lift the agitator 9 and the agitator storage cask 10 together with the crane 8, directly above the opening 1a along the monorail 7 as shown by the solid line in Figure 1. move to position. After that, the wire 8a of the crane 8 is operated to create the agitator 9 and the agitator storage cask 10.
is lowered and placed on the pedestal 3 with the bottom surface of the stirrer storage cask 10 (solid line in FIG. 2).

Thereafter, the bottom cover 13 is pulled out automatically or manually to open the lower opening 10b. Thereafter, when the wire 8a of the crane 8 is paid out, only the agitator 9 is lowered, and the guide rollers 9a, 9a are further lowered while rolling on the guide rails 11, 11, and are stopped at a predetermined position.

In this state, the stirrer 9 is operated to uniformly mix the waste fat 16 and the waste liquid 17, and the waste liquid 17 is used for waste liquid treatment.

After that, if you want to pull out the agitator 9 after periodic inspection or waste liquid treatment, wind up the wire of the crane 8 and move the agitator 9 to the agitator storage cask 1.
Raise it to within 0. Thereafter, cleaning is performed by spraying cleaning liquid toward the agitator 9 from the cleaning mechanism 14, which is connected to the cleaning liquid supply section 15 in advance. Furthermore, a suitable drying mechanism (not shown) provided in the stirrer housing cask 10 blows warm air onto the stirrer 9 to dry it.

Thereafter, the bottom cover 13 is inserted to close the opening 10b of the stirrer storage cask 10, to isolate it from the storage container 2, and to remove the cleaning mechanism 14 from the cleaning liquid supply section 15.

Next, the stirrer 9 is completely reversed to the case of the insertion described above.
The agitator storage cask 10 is then taken out of the concrete frame 1 and placed on a washing tray (not shown) in a washing area. At the same time, the concrete hatch 4 is returned to its original position to close the opening 1a.

During this movement, the stirrer storage cask 10 is
3, which prevents the radioactive materials inside from leaking to the outside and eliminates the possibility of exposure to radiation.

Next, the outside of the agitator housing cask 10 on the cleaning liquid receiving tray is covered with an appropriate working space, and the outer periphery thereof is cleaned. Thereafter, the agitator storage cask 10 is disassembled and the internal agitator 9 is cleaned again. After that, the stirrer 9 is inspected. This inspection is conducted under conditions free of radioactive materials, thus preventing radiation exposure to workers.

Stirring of the waste liquid 17 and the like is resumed in the same manner as described above after the stirrer housing cask 10 is assembled.

Further, the number of agitators 9 may be plural depending on the size of the storage container 2.

In addition, when storing the agitator 9, after cleaning is completed on the cleaning tray, the agitator storage cask 1
0 may be moved to a storage position while disassembled, or may be moved after being assembled.

Since this agitator storage cask 10 can be disassembled, there is no need to provide a working space between it and the agitator 9, as in the conventional case, so that it is much smaller than the conventional one. Therefore, the space occupied at the storage location is reduced.

〔Effect of the invention〕

Since the agitator handling device for radioactive waste liquid storage containers of the present invention is constructed and operates as described above, it is possible to install the agitator in the agitator storage cask without installing cleaning devices in each of a large number of storage containers as in the past. By providing a single cleaning mechanism, the agitator can be reliably cleaned, the overall configuration of the device is simple, the cost is low, and radiation contamination can be prevented. By being able to be disassembled and reassembled, the entire device can be made smaller, space can be used more effectively, and cleaning and inspection work can be easily performed.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional side view of a storage container section using the inventive device, and FIG. 2 is a longitudinal sectional side view of the inventive device. 2...Radioactive waste liquid storage container, 6...Transportation mechanism, 9...
Stirrer, 10... Stirrer storage cask, 10a...
Hole, 10b...Opening, 13...Bottom cover, 14...Cleaning mechanism, 15...Cleaning liquid supply section.

Claims (1)

[Scope of Claims] 1. A stirrer that performs a stirring action in a radioactive waste liquid storage container, and a bottom lid that allows the stirrer to be stored in and out through a lower opening that can be opened and closed, and a top lid of the storage container that has a bottom lid. an agitator storage cask that can be placed on a pedestal formed around the opening; and a cleaning mechanism that cleans the agitator, which is provided within the agitator storage cask and can be freely connected to an external cleaning liquid supply section. , moving the agitator housed in the agitator storage cask in the horizontal and vertical directions together with the agitator storage cask;
A radioactive waste liquid characterized by having a transport mechanism capable of lowering the stirrer from inside the stirrer storage cask or pulling it up into the stirrer storage cask when the stirrer storage cask is placed on the pedestal. Agitator handling equipment for storage containers. 2. The agitator handling device for a radioactive waste liquid storage container according to claim 1, wherein the agitator storage cask is formed so as to be freely disassembled and assembled.