JPH0675114B2 - How to load and unload equipment into the cell - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention provides a temporary inside of a hot cell, a glove box, or the like (in this specification, these are collectively referred to as “cell”) that handles radioactive materials in a nuclear facility. TECHNICAL FIELD The present invention relates to a method for carrying in an instrument or the like to be used for a specific purpose into a cell and using it, and then carrying it out without directly contacting a contaminated atmosphere or contaminants inside the cell.

<Prior art> When the equipment that has been conventionally brought into the contaminated atmosphere inside the cell is taken out of the cell and then reused, put the contaminated equipment into a glove box or the like for decontamination work. There was a need.

On the other hand, when the dose in the cell is measured with a dosimeter or when the simple shield is carried into the cell, the dosimeter and the simple shield are sealed inside a bag made of polyvinyl chloride film, etc. The equipment in the bag is not contaminated because it can be carried in and used in the cell, and can be directly transported out of the cell. However, the work of collecting the equipment from the bag has to be performed in the glove box, and the equipment in the bag is also contaminated at this time.

<Problems to be Solved by the Invention> The decontamination work and the collection work of the equipment as described above take time, and the worker's exposure to the decontamination work and reduction work of the glove box and the like must be performed while paying attention. Instead, it was a work that needed improvement. Therefore, in the present invention, in a series of steps in which the equipment is temporarily used in the cell, then carried out of the cell and reused, the equipment does not directly contact the contaminated atmosphere or contaminants in the cell, and It was made for the purpose of providing a method of carrying in and out without causing contamination.

<Means for Solving the Problems> According to the present invention, the above object can be achieved by the following method.

When loading the equipment into the cell, first, the open end of the bottomed tubular bag made of the heat-fusible film is locked to the port portion of the cell. In this state, the bottom portion of the tubular bag is folded back into the tubular bag, and after inserting the sealed bag in which the equipment and the sheet piece for preventing fusion are sealed and sealed into the folded portion, the folded portion of the tubular bag is To seal.
Then, the bottom of the tubular bag is cut to take out the sealed bag, and the sealed bag is loaded into the cell.

When carrying out the equipment from the cell, put the sealing bag containing the equipment and the sheet piece for fusion prevention in the cylindrical bag remaining part that seals the port part, and double the bag parts. Overlap. Next, the double-sealed bag portion is fusion-sealed at the fusion-prevention sheet piece portion, and this fusion-sealed portion is cut together with the sheet piece. Thus, since the double bag portion which is not fused by the fusion preventing sheet piece becomes an opening, the equipment can be taken out through this opening.

<Operation> According to the above-described method of the present invention, since the loading of the equipment into the cell and the use of the equipment in the cell are performed in a state of being placed in a sealed bag, the equipment is contaminated in the cell. There is no direct contact with the equipment and therefore the equipment is not contaminated.

When the equipment is carried out of the cell, the bag portion is doubly overlapped and fused, so that the contaminated surface of the bag is not exposed to the outside, so there is no fear of contaminating the surroundings. Thus,
It is possible to collect the equipment without contaminating the equipment through the double bag partial opening which is not fused by the fusion preventing sheet piece.

<Examples> The present invention will be described in more detail below with reference to the examples shown in the drawings.

FIG. 1 shows a state in which a bottomed tubular bag 1 made of a heat-fusible film such as polyvinyl chloride or polyethylene is locked to a port portion 3 of a cell 2. The locking means 4 may be a conventional O-ring, packing, fastener or the like. In the figure, the right side of the cell 2 is the contaminated atmosphere inside the cell. Next, as shown in FIG. 2, the bottom portion 1a of the tubular bag 1 is folded back inwardly of the tubular bag, and the folded back portion is
A sealing bag 8 in which the equipment 5 and the fusion preventing sheet piece 6 are enclosed and sealed in advance is inserted. In this state, as shown in FIG. 3, the folded-back end portions of the four cylindrical bags 1 are welded and sealed (hatched portion A). Next, the bottom portion 1a of the tubular bag is cut along the dotted line a.

Thereby, as shown in FIG. 4, the sealed bag 8 including the equipment 5 and the sheet piece 6 can be carried into the cell 2. The device 5 is used in the cell 2 while being enclosed in the sealed bag 8. On the other hand, the remaining portion 1b of the tubular bag can seal the inside of the cell 2 by sealing the port portion 3 with the fusion sealing portion A, and the remaining portion 1c of the tubular bag extending inward from the fusion sealing portion A is , Welded part A
Cut near the.

When the device is used in the cell and then carried out from the cell, the sealed bag 8 is inserted into the remaining portion 1b of the tubular bag that seals the port portion 3, as shown in FIG. Next, these double-layered bag portions (four layers) are fusion-sealed at the portion of the fusion-preventing sheet piece 6 by high-frequency sealing (hatched portion B), and this fusion-sealing portion B is cut along the dotted line b.

The cross section taken along line VII-VII in FIG. 5 at this time is as shown in FIG. 7. That is, the outer surface of the sealed bag 8 and the inner surface of the remaining portion 1b of the tubular bag, which are contaminated with the contaminated atmosphere in the cell, are enclosed inside the double-layered bag portion, and therefore The outside of the balance 1b is not contaminated. Further, since the portion where the fusion preventing sheet piece 6 is sandwiched is not fused, an opening (number 7 in FIG. 6) is formed in the double bag portion by cutting along the sheet piece 6. It

Thus, as shown in FIG. 6, the equipment 5 in the sealed bag 8 can be recovered from the opening 7 without contamination. Further, since the remaining portion of the double bag portion remains locked in the port portion 3 of the cell 2, the inside and outside of the cell can be kept isolated.

The fusion-preventing sheet piece 6 used in the present invention may be made of any material that does not fuse to the heat-fusible bag portion when it is fused, and for example, polypropylene sheet or paraffin paper can be used.

<Effects of the Invention> According to the above-described invention, the following effects can be obtained.

1) Reduction of exposure dose by eliminating the need for decontamination work When handling the radioactive materials, etc., when the equipment once used inside the cell is to be used outside the cell, the equipment is conventionally removed from the cell. Decontamination work was required after the product was shipped. On the other hand, by using the method of the present invention,
Since the equipment can be collected without decontamination work, the labor and time have been shortened, and the exposure dose has been reduced (about half of the conventional level).

2) Reduction of radioactive waste Since equipment and the like are not contaminated during use inside the cell, they can be reused as they are after being carried out of the cell, and the generation of radioactive waste is greatly reduced.

[Brief description of drawings]

1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, and FIG. 6 are explanatory views showing each step of the embodiment of the method of the present invention in order, and FIG. FIG. 7 is a sectional view taken along the line VII-VII. DESCRIPTION OF SYMBOLS 1 ... Cylindrical bag with a bottom, 1a ... Cylindrical bag bottom part, 1b, 1c ... Cylindrical bag remainder, 2 ... Cell, 3 ... Port part, 5 ... Equipment, 6
… Sheets for fusion prevention, 7… Opening, 8… Sealing bag, A,
B: fusion-sealed part, a, b: cutting line.

Claims (1)

[Claims] 1. When loading equipment into a cell, the bottom of the tubular bag is made of a heat-fusible film with the open end of the tubular bag being locked to the port of the cell. The inside of the tubular bag is folded back, and after inserting a sealed bag in which the equipment and the heat-sealing preventing sheet piece have been sealed and sealed into the folded portion, the folded portion of the tubular bag is melt-sealed and then the tubular bag When the bottom of the bag is cut, the sealed bag is taken out and carried into the cell, and when the equipment is carried out from the cell, the equipment and the fusion prevention are put in the remaining cylindrical bag that seals the port. After putting the hermetically sealed bag containing the sheet pieces therein and overlapping the bag portions with each other, the bag portions overlapped with each other are melt-sealed at the sheet portion, and the sealed portion is replaced with the sheet piece. Cut with and do not fuse with the sheet pieces A method of loading and unloading the equipment into the cell so that the equipment can be taken out through the opening of the double bag part.