JPH0758348B2 - Long film curing film tube and method of using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when handling a long object (for example, a pipe, a cylindrical filter, etc.) whose outer surface is contaminated by radioactive substances, scatters pollutants to the surroundings, It is intended to prevent the adherence to the.

[0002]

2. Description of the Related Art Conventionally, for example, in the case of performing a long object exchange operation such as a condenser thin tube exchange operation in a BWR type nuclear power plant or a condensate purification system filter element exchange operation, the outer surface is Since it is polluted by the radioactivity of the primary system steam or condensate, the tip of a long object (hereinafter referred to as "cultivation organism") is attached as shown in Fig. 8 for the purpose of preventing diffusion to the non-contaminated area. Insert it into the film tube 12,
The film tube is covered by pulling the tube or pushing in the creature. In this case, the tube is often caught in a corner or a curved portion of the creature to be covered, which may prevent smooth coating.

As another method, as shown in FIG. 9, a belt-shaped film sheet 13 is wound around the to-be-cultivated organism 5, and further, as shown in FIG. There is a method of wrapping with 13.

[0004]

The above-mentioned conventional methods are all poor in workability, and there is a risk of contamination by radioactivity when there are a large number of creatures or a long one. , Safe and convenient method is required.

The present invention has solved the above-mentioned problems in the prior art.

[0006]

According to the present invention, a stretchable film tube having an opening at one end or both ends is provided, and a tubular material having a length substantially equal to or slightly longer than the compressed length of the tube is provided. , It is characterized in that it is inserted through a tube so that it can be inserted and removed freely, and the tube is intended to cover long-life creatures that may be contaminated in order to isolate it from the outside (curing). To do.

[0007]

FIG. 1 is an explanatory view showing an embodiment of the present invention.
Reference numeral 1 is a film tube having an opening at one end or both ends, and the whole is configured to be expandable and contractible in a bellows shape. Reference numeral 2 denotes a tubular material that serves as a core material when the tube 1 is reduced (stored). Further, FIG. 2 shows another embodiment of the present invention.
The cylindrical object in this case is configured in a rectangular shape.

An example of the case where the condenser tube in the BWR type nuclear power plant is replaced by using the tube of the present invention having the above-mentioned structure will be described with reference to FIGS. 3 to 5.

The condenser in the BWR type nuclear power plant is
As shown in FIG. 3, tens of thousands of thin tubes each having a length of about 15 m are arranged, and seawater flows inside. On the other hand, the outer surface is exposed to radioactive primary vapor.

By the way, when an abnormality is found in the thin tube during the periodic inspection, the thin tube is pulled out and replaced with a new one. However, since the old tube is contaminated, the pollution is scattered on the seawater side which is a non-contaminated area. We must take measures not to do so.

Therefore, in the present invention, as shown in FIG. 4, on the wall surface 4 at the tip of the thin tube (non-cultivation) 5 to be replaced,
The thin tube 5 is pulled out into the film tube 1 by pressing the film tube 1 which is still compressed.

At this time, as the thin tube 5 moves, the compressed film tube 1 gradually expands and is completely covered without exposing the thin tube 5 to the atmosphere in the non-contaminated area. (See Figure 5)

Therefore, if the thin tube 5 is completely housed in the film tube 1 and then the opening is closed, the thin tube 5 is cured and the non-contaminated area can be surely prevented from being contaminated.

FIG. 6 is an explanatory view showing a condensate purification system filter element, and 6 is dirty water on the outside of the filter 7. The filter 7 is attached to the wall surface 8 and serves to purify this dirty water. FIGS. 7A to 7F show the work of pulling out and replacing the filter (cultivation object).

That is, the film tube 1 having openings at both ends is attached to the filter suspension jig 11 [FIG.
Then, after the jig 11 is hung on the filter and connected to the filter 7, the film tube 1
The upper end of the film is temporarily sealed [see FIG. 7 (a)], and the film tube 1 is gradually extended as the filter 7 is lifted [see FIG. 7 (c)]. The lower end of the film tube 1 is sealed when it is housed in [see FIG. 7 (D)].

Then, the temporary seal 9 at the upper end of the film tube 1 is temporarily removed, and the hanging jig 11 is provided (see FIG. 7 (e)).
After removing from the filter 7, it is completely sealed.

Further, the sealing portion 10 at the lower end of the film tube 1 and the tubular member 2 are separated. [Refer to FIG. 7 (F)]

By the above operation, the filter can be easily removed.

[0019]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, in spite of an extremely simple structure, when handling a long-sized creature such as a pipe or a filter whose outer surface is contaminated by radioactive substances,
Since it is possible to prevent accidents where pollutants are scattered around or adhere to workers, it is extremely effective in terms of safety measures.

Even if the organism to be cultured has a bend or does not have rigidity like a cable, it can be easily aged.

When not in use, the volume can be reduced by compressing the film tube, so that it is easy to store, and at that time, by inserting the tubular object,
The effect is great such that there is no fear of deformation.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing another embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a configuration of a condenser thin tube of a BWR type nuclear power plant using the present invention.

FIG. 4 is an explanatory view showing a replacement work of condenser thin tubes according to the present invention.

FIG. 5 is an explanatory view showing a replacement work of condenser condenser tubes according to the present invention.

FIG. 6 is an explanatory diagram showing the configuration of a condensate purification system filter element of the BWR type nuclear power plant used in the present invention.

FIG. 7 is an explanatory view showing the replacement work of the condensate purification system filter shown in FIG. 6 in order (A) to (F).

FIG. 8 is an explanatory diagram showing a method of exchanging a long object according to a conventional technique.

FIG. 9 is an explanatory view showing a method of exchanging a long object according to a conventional technique different from that of FIG. 8;

FIG. 10 is an explanatory diagram showing a method of exchanging a long object according to a conventional technique different from FIGS. 8 and 9;

[Explanation of reference symbols] 1 film tube 2 tubular object 3 rectangular tubular object 4 wall surface 5 thin tube 6 dirty water 7 filter 8 wall surface 9 seal 10 sealing part 11 filter hanging jig 12 film tube 13 film sheet

Claims (3)

[Claims] 1. A stretchable film tube having an opening at one end or both ends is provided, and a tubular material having a length substantially equal to or slightly longer than the compressed length of the tube is removably inserted into the tube. A film tube for curing long objects characterized by the above. 2. The film tube for curing a long object according to claim 1, wherein the tubular object to be inserted into the tube has a cylindrical shape or a rectangular tubular shape. 3. An elastically formed film tube opening is applied to a pull-out position of a long-sized to-be-cultured object in a contracted state, and the to-be-cultured object is pushed into the film tube to move the to-be-cultivated object. Accompanied by extending the tube,
A method for using a film tube for curing a long object, which comprises covering the opening and sealing the opening.