JPS58798A - Method of processing radioactive contaminated material in atomic power plant - 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] There is a lot of fuss about nuclear power plants today, but 4
The first issue is the radiation exposure of workers and how to dispose of radioactive contaminants. There are countless amounts of contaminated dust floating inside the power plant, and this dust adheres to the walls and floors and accumulates little by little. . If cleaning tools are used, they become cross-contaminated. In addition, close attention must be paid to the amount of radiation that workers in the operator's cabin and other areas are exposed to. On the other hand, nuclear power plants use many pipes and tanks for steam and cooling water, and the inside surfaces of the pipes and tanks accumulate limescale and sediment, which are mostly pollutants. Traditionally, pipes and tanks are cleaned periodically by running high-pressure water through them or by sandblasting. However, the high-pressure water and sand used cannot be thrown away, so they must be further decontaminated through a filter. The current situation is that treating pollutants requires a lot of effort.

The present invention aims to simplify such complicated processing and provide a processing method that does not require washing water. Embodiments will be described in detail below with reference to the accompanying drawings. FIG. 1 is a simplified diagram of the operator's cab in a power plant. In this case, apply strippable paint 1 on one side of wall 2 or floor 3 in advance. Strippable paint can be easily applied with a brush or paint sprayer like paint, but after it dries, it can be applied with tape. It has the property of being easily peeled off. −
・After a period of time, most of the contaminants 4 will adhere to the surface of the paint l) After peeling off the coating as shown in Figure 2, All you have to do is fill drums with each pollutant and dump them into the deep sea.

This will make the troublesome cleaning of radioactive dust easier and prevent contamination of the building itself. Also, unlike regular cleaning work, there is no floating radioactive dust. Furthermore, as shown in FIG. 2, contaminants 4' that had adhered to the walls and floors before the paint 1 was applied are also removed. Third
The peelable paint 1 is also applied to the inner surfaces of the pipe 5 and tank 6 as shown in the figure. All contaminated limescale and sediment will adhere to the paint 1, so the rest can be treated in the same way as in the previous case. This eliminates the need for forceful decontamination of cleaning water and the process of extracting and solidifying contaminants. Since all pollutants are treated as solids, no pollutant runoff occurs. If the area where the paint is used is angular or the paint film is thin and there is a risk of it peeling off, the paint 11 and the reinforcing fibers 7 should be removed as shown in Figure 4.
Mix it with. For the reinforcing fibers 7, ordinary bandages, glass fibers, etc. can be used.For the removable paint, those commercially available under the trade name Kurivac are suitable.0As described above, the treatment method of the present invention (according to Work force: It has the advantage that it becomes extremely easy and there is no floating of radioactive chips at all.

[Brief explanation of the drawing]

Figure 1 is a simplified diagram of the driver's cab, Figure 2 is an enlarged view of the paint strip in one state, Figure 3 is a simplified diagram of the knob and tank, and Figure 4 is a simplified diagram of the driver's cab.
The figure is an enlarged view of the paint mixed with reinforcing fibers.

Claims (1)

[Claims] At a nuclear power plant, where peelable paint is applied in advance to walls, floors, pipes, tanks, etc. in buildings that may be contaminated by radioactivity, and the paint is periodically peeled off and disposed of. How to dispose of radioactive contaminants.