JPS58109895A - Solidified material of radioactive waste - 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] The present invention is a solidification treatment body for treating radioactive waste generated at nuclear power plants, etc., and a solidification coating for radioactive waste inside a container has been modified. Concerning solidification of radioactive waste.

Conventionally, there is a technology to cover and store radioactive waste with assimilated substances such as κ cement in containers such as drums to improve the quality of the garden.
This cement cement is highly stable because it is mixed with an inorganic agent, but due to the poke-like nature of cement, the relative amount of solidified waste to cement is generally small in consideration of water permeability. It was something I had no choice but to do.

An object of the present invention is to provide a radioactive waste solidification treatment body that can expand the relative capacity of the radioactive waste solidified body contained in a container at low cost.

The present invention makes it possible to thin the solidified layer itself while reliably preventing the leakage of radioactive proboscis due to flooding by forming a water-permeable layer on the fitting surface of the assimilated layer. This is to achieve the above objectives.

In addition to cement, asphalt, plastic, and other materials have been considered as assimilating agents for this type of radioactive waste.9 In terms of volume reduction capacity, plastic is preferred;
In addition, in terms of stability, cement already has a proven track record in a wide range of fields. The present invention also enables the use of inorganic materials such as alkaline silicate solutions as an assimilating agent that is stable and has a large capacity for volume reduction, and prevents thickening due to porous properties, which is a problem in this case. This makes it possible to accommodate more efficiently.

The following is part 5j of the present invention! An embodiment will be described in accordance with the manufacturing procedure with reference to the drawings.

A drum 1 with an open end is rotated around its axis with the opening facing upward, and glass fibers 2 impregnated with an alkaline silicate solution are introduced into the drum 1 and tightly adhered to the inner surface of the drum 1 by centrifugal force. let At this time, the glass fiber 2 impregnated with the alkali silicate #I solution adheres to the inner wall of the drum and the harmful birds due to its viscosity based on the alkali silicate solution. In addition, on the inner peripheral side of the glass fiber 2 after being in close contact with each other, the alkali silicate S* flows down to the lower part due to gravity, and the inner iut surface of the glass fiber has a rough surface along the glass fiber itself. appear.

Next, two glass fibers are laid on the inner surface of the drum 1, and the bottom glass fiber is impregnated with the alkali silicate solution that has flowed down from the glass fibers on the side surface, and is dried and solidified together with the side surface.

As a water-impermeable substance, an inorganic double building material such as 8i0t61% is used.

B goose 0a14%* At1O@1 0%, N
O, 08%.

A water-impermeable layer 4t is formed by selecting a glaze containing 107% K and firing it on the rough inner surface of the glass fiber.

After inserting the pellet-shaped waste obtained by compression molding radioactive waste into the solidification container obtained in this way,
The alkaline silicate solution is injected so as to cover the entire pellet, and the glass fiber M5 is placed on the top surface, impregnated with the alkaline silicate solution and solidified, and a water-impermeable layer 4 is formed on the side and bottom surfaces as well. After firing, a layer 6 of an alkali silicate solution alone is provided on top of the firing, and finally the entire container is sealed with fl1A.

According to the radioactive waste solidified body thus formed, the glass fibers adhere to the drum 1 due to the alkaline silicate solution, and the water-impermeable layer 4 is formed in the rough areas along the surface of the glass fibers. It's like something that's in close contact with water glass.9
, a solidified material with high water resistance from the outside of the drum can is obtained.

Therefore, even if the solidified material layer is made relatively thin, sufficient water resistance can be obtained. The amount can be increased, making it possible to efficiently collect and dispose of waste.

If the above-mentioned material is used as the water-impermeable layer 4, the workability will be Vh4 due to its low melting point. Various water-resistant resins (including water-resistant paints, etc.), glazes, and ceramic materials can be used as long as they have good adhesion.

In addition, when glass fibers are used as the solidifying agent absorbing layer as in the above-mentioned embodiment, it is possible to obtain a reliable water-impermeable material with good workability while maintaining cost advantages. has advantages.

In the above embodiments, the waste was made into t-vets and stored, but the present invention is not limited to such 4 t-sized wastes, but the waste is not made into pellets, but after being pulverized, it is kneaded with water glass and stored in the same way. It may be solidified into a solidified material with high water resistance.

It goes without saying that the present invention can be implemented using any organic or inorganic material as the assimilation layer.

As described above, according to the present invention, by using a porous solidifying agent such as alkali silicate at which has been used successfully, it is possible to obtain a water-resistant assimilate with excellent economic efficiency. 4, which can expand the relative capacity of waste to assimilate.

[Brief explanation of drawings]

The figure is a sectional view showing one embodiment of the present invention.

Claims (1)

[Scope of Claims] 1. A radioactive waste solidification treatment body comprising a radioactive substance contained in a sealed container with the outer surface covered with a solidification layer made of an inorganic or organic material. -The solidified layer #l! A solidified body of radioactive waste characterized by having a water-impermeable layer in the garden part. 2. The radiation according to claim 1, wherein the water-impermeable layer is made of water-resistant resin, glaze, or ceramic! Solidification of waste. 3. The assimilation layer is made of glass fiber and is in close contact with the water-impermeable layer and the container through water glass. Solidified body.