JPS5835498A - Method of storing high level radioactive solid waste in cask without contaminating cask surface - 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 Highly radioactive solid waste 1 For example, when equipment inside a nuclear reactor, spent nuclear fuel, etc. accompanying the decommissioning of a nuclear reactor are transferred outside the reactor for disposal, J! [Highly radioactive solid waste is stored in transport containers in the pool above the child reactor.] Therefore, since the transport container is also immersed in the pool, the surface of the transport container is also contaminated with radioactive materials. Therefore, after storing highly radioactive solid waste, it is necessary to clean the surface of the transport container.

This cleaning KFi requires a great deal of labor and is exposed to radiation during the process. In particular, when highly radioactive solid waste is spent nuclear fuel, a cooling piece is provided on the surface of the transport container to dissipate decay heat. The surface is.

The temperature has increased from 50℃ to 80℃, which requires a lot of effort.

In order to overcome these drawbacks, the present invention relates to a method for storing highly radioactive solid waste in a transport container without contaminating the surface of the transport container with radioactive substances.

The present invention will be explained with reference to the drawings.

B. The transport container 1 is immersed in a solution containing a synthetic resin, such as a vinyl copolymer, as the main component. The synthetic resin solution differs depending on the components of the synthetic resin, but if the main component is a vinyl copolymer, the solution is heated to 35°C to 45°C.

The transport container 1 is then taken out of the synthetic resin solution and its surface is dried, and the surface of the transport container 1 is then coated with the synthetic resin. Drying may be carried out naturally, and since the coated synthetic resin is peelable, the coated synthetic resin can be easily peeled off from the surface of the transport container 1 if necessary.

C. The transportation container 1 is immersed in the pool 3 in a state in which highly radioactive solid waste can be stored, for example, with the lid removed.

2. Inside the pool 3, the highly radioactive solid waste 2 taken out from the nuclear reactor 4 is stored in the transport container 1 using a crane.

E. Seal the transport container 1 with a lid or the like to prevent the highly radioactive solid waste inside the transport container 1 from being discharged to the outside.

Then, transport container 1 is taken out of pool 3.

First, the entire transport container 1 is washed with water to remove radioactive substances attached to the surface of the container. In this case, the surface of the coated synthetic resin can be removed by ordinary water spraying, and full-scale cleaning is not necessary.

First, the synthetic resin coated on the transport container 1 is peeled off.

In the present invention, since the highly radioactive solid waste 2 is stored in the transport container 1 using the above steps, the surface of the transport container 1 that comes into contact with the synthetic resin solution is coated, so that it does not come into direct contact with the pool water. Therefore, the surface of the transportation container 1 is not contaminated with radioactive materials, and the highly radioactive solid waste 2
There is no negative impact on storage. Therefore, it is not necessary to spend a lot of effort to clean the transportation container 1 after storing the highly radioactive solid waste 2, unlike in the past, and therefore, the radiation exposure of those engaged in the work can be reduced.

The synthetic resin after peeling is discarded, but the storage volume can be easily reduced by heating it.

[Brief explanation of the drawing]

The drawings show an example of a method of storing highly radioactive solid waste 2 in a transport container 1 without contaminating the surface of the transport container 1 according to the present invention. FIG. 1 is a block diagram showing the method of the present invention. FIG. 2 is a diagram showing a state in which highly radioactive solid waste 2 is stored in a transport container 1.

Claims (1)

[Claims] A method of storing highly radioactive solid waste in a transport container after immersing the transport container in a synthetic resin solution and drying it.