JPH02287298A - Solidification treatment for radioactive waste - Google Patents

Abstract

PURPOSE:To reduce an amount of a waste, and to diminish a facility size and a required labor by adding a dispersion material to a liquid component of a wasting water which is separated from an aggregate component contained in a waste washing water, and by reusing the liquid component as a kneading water. CONSTITUTION:A solidification material and kneading water sent to a mixer 3 are mixed together and are filled in a waste treatment container 6 as a solidifying filler material. After completion of this solidification treatment work, a specific amount of a washing water in a washing water hopper 7 is sent to the mixer 3, the solidifying filler material sticking to the mixer 3, is removed and the waste washing water is separated into an aggregate component and a liquid component of a washing water by a separator 9. Then, a specific amount of the separated liquid component is returned to the hopper 7 after being measured and is reused as kneading water for a next solidification treatment work after being mixed with a specific amount of a dispersion material sent from a dispersion material hopper 11, and water 13. Meanwhile, the aggregate component separated by the separator 9, is sent to a treatment mechanism 14 as a radioactive waste. Accordingly, the discharged waste consists of the aggregate component only and therefore an amount of the waste can be reduced and a facility size of a waste washing water treatment and required labor can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention (Field of Industrial Application) The present invention relates to a radioactive waste solidification device.

(Prior art) Conventionally, as a method for processing radioactive waste such as radioactive concentrated waste liquid generated in facilities handling radioactive materials such as nuclear power plants and nuclear fuel reprocessing facilities, this radioactive waste is stably solidified. Solidification treatment methods are being considered.

This solidification treatment method is a method in which radioactive waste such as pellets is stored in a processing container, and a solidification filler consisting of a solidification material, a dispersion material, etc. is filled into the processing container and solidified.

Conventionally, the supply device for the solidified filler used in such a solidification method includes a solidification material hopper section, a hopper section for kneading water made of water and dispersed snow, and a hopper section for mixing these solidification materials and kneading water to supply the solidified filler. A mixer is known that includes a mixer that produces and supplies waste into a waste storage container.

In this solidification treatment method, by using a solidification material containing a hydraulic inorganic compound, an aggregate, an inorganic fluidizing agent, a reaction inhibitor, etc., the filling rate is particularly high, and long-term stability, durability, and It is possible to dispose of radioactive waste with excellent fire resistance.

(Problems to be Solved by the Invention) By the way, in the solidified filler supply device in the solidification apparatus described above, after the solidification and filling operation is completed, the solidified filler remaining attached to the mixer is cleaned with a cleaning liquid.

In this way, waste liquid generated in facilities that handle radioactive materials such as nuclear power plants is treated as radioactive waste l[k, so such waste liquid must be treated as radioactive waste, and the amount of waste liquid must be reduced. This is advantageous from the viewpoint of lower equipment costs and work efficiency.

However, in conventional solidification processing equipment, the waste liquid from cleaning the mixer is discharged as waste liquid, so
In long-term use, the amount of waste liquid becomes enormous, and there is a problem in that a lot of money and time are spent on equipment and processing operations for waste liquid treatment.

The present invention was made in order to solve these conventional problems, and is a solidification method for radioactive waste that can reduce the cleaning waste liquid from the mixer and minimize the equipment and labor involved in cleaning waste lfM treatment. 1] The purpose is to provide a device.

[Structure of the Invention] (Means for Solving the Problems) The radioactive waste solidification apparatus of the present invention includes a mixer that mixes a solidification material and kneading water to create a solidified filler, and a a cleaning mechanism that supplies a cleaning liquid into the mixer to clean and remove solidified filler adhering to the mixer;
In an apparatus that performs solidification treatment of radioactive waste by adding pre-filling material to radioactive waste, the cleaning waste liquid from the mixer is combined with the cleaning water component and the aggregate component in the solidification). The present invention is characterized by comprising a separation mechanism for separating into two, and a cleaning water component reuse mechanism for adding a predetermined amount of dispersing material to the separated cleaning water component to create the mixed wire material.

(Function) The present invention separates the aggregate component and the washing water component contained in the washing waste liquid after washing the mixer, adds a dispersant to this washing water liquid component, and uses the mixture as kneading water. By configuring it to be reused, the waste discharged from the solidification treatment equipment is only the aggregate component, making it possible to significantly reduce the amount of waste and downsizing the equipment and labor involved in processing cleaning waste liquid. becomes.

(Example) Hereinafter, an example in which the present invention is applied to a radioactive waste cement filling and solidification processing apparatus installed in a nuclear power plant will be described with reference to the drawings.

FIG. 1 is a diagram showing the configuration of the solidified filler supply mechanism in the solidification processing apparatus of the embodiment, in which the solidified material accommodated in the solidified material hopper 1 is measured in a predetermined amount by a measuring device 2 and then transferred to a mixer 3. Sent. On the other hand, a predetermined amount of kneading water made up of a dispersant, water, etc. contained in the kneading water hopper 4 is also measured by a measuring device 5 and sent to the mixer 3. The solidified material and kneading water thus sent into the mixer 3 are mixed and filled as a solidified filler into a waste treatment container 6, such as a drum, containing waste.

After the solidification process is completed, a predetermined amount of the cleaning water contained in the cleaning water hopper 7 is measured by the measuring device 8 and sent to the mixer 3 to remove the solidified filler that has adhered to the inside of the mixer 3. The washing waste liquid after washing is sent to the separation device 9, where the aggregate component and the washing water component are separated.

The cleaning water component separated by the separator 9 is measured in a predetermined amount by a measuring device 10 and sent to the cleaning water hopper 7. The cleaning water component sent to the cleaning water hopper 7 is mixed with the dispersion material and water 13 that have been metered in a predetermined amount by the measuring device 12 from the dispersion material hopper 11 and fed therein, and then used again during the next solidification process. The water is sent into the mixer 3 as kneading water.

On the other hand, the aggregate components separated by the separation device 9 are sent to the processing mechanism 14 and processed as radioactive waste.

In this way, the aggregate component and the cleaning water component contained in the cleaning waste liquid after cleaning the mixer 3 are separated, and the dispersant is added to this cleaning water component to be reused as kneading water. With this configuration, the waste discharged from the solidification treatment device is only aggregate components, and the amount of waste can be significantly reduced, making it possible to downsize the equipment and labor involved in processing cleaning waste liquid.

[Effects of the Invention] As explained above, according to the radioactive waste solidification treatment apparatus of the present invention, the amount of waste discharged during solidification treatment can be significantly reduced, and the equipment and labor involved in cleaning waste liquid treatment can be reduced. It becomes possible to downsize.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a solidified filler supply mechanism in a radioactive waste solidification processing apparatus according to an embodiment.

Claims (1)

[Scope of Claims] A mixer that mixes a solidifying material and kneading water to create a solidified filler, and a cleaning liquid that is supplied into the mixer at the end of solidification work to clean the solidified filler that has adhered to the inside of the mixer. an apparatus for solidifying radioactive waste by adding the solidified filler to the radioactive waste, wherein the cleaning waste liquid from the mixer is combined with the cleaning water component and the aggregate in the solidifying material. Radioactive waste comprising: a separation mechanism that separates the separated cleaning water components; and a cleaning water component reuse mechanism that adds a predetermined amount of dispersion material to the separated cleaning water components to create the mixed wire component. Material solidification processing equipment.