Method for cleaning and decontaminating inside structure contaminated by radioactive substance, and cleaning and decontamination device vehicle

Abstract

Provided is a method for decontaminating the inside of a structure contaminated by radioactive substances, that removes contamination of floor and wall surfaces and ceilings, etc., inside the structure contaminated by the radioactive substances, using reduced water as cleaning water, and purifies and makes reusable waste water used in the decontamination. The method has: a cleaning stage in which the reduced water negatively charged at a potential of negative 400 - negative 600 mV is scattered on the decontamination-target object contaminated by the radioactive substances and brushing occurs; a cleaning waste water recovery stage in which the cleaning waste water is recovered; a filtration stage in which the cleaning waste water is sent to a filter and the coarse-grained solid component thereof is filtered; a first adsorption stage in which the cleaning waste water is caused to pass through a column filled with a mixture of hydrogen ion-saturated clay and alum or a column filled with a hydrogen ion-saturated cation-exchange resin, and cationic radioactive substances in the cleaning waste water are adsorbed and removed; a second adsorption stage in which the cleaning waste water is caused to pass through a column filled with a hydroxide ion-saturated anion-exchange resin and anionic radioactive substances in the cleaning waste water are adsorbed and removed; a third adsorption stage in which the cleaning waste water is caused to pass through a column filled with zeolite and residual radioactive substances in the cleaning waste water are removed; and a microbubble processing stage in which the cleaning waste water is processed using air microbubbles and returned to water having high biological activity.

Description

technical field [0001] The present invention relates to a cleaning and decontamination method and a cleaning and decontamination device inside a structure contaminated by radioactive substances. A method of cleaning and decontaminating the interior of a structure contaminated by radioactive substances and cleaning and decontaminating vehicles that have been purified to become reusable water. Background technique [0002] In nuclear power plants, due to prolonged exposure to high temperatures, the concrete surface or exposed metal surface of the inner wall is oxidized, and high levels of radioactive substances are adsorbed at the end of the oxidized substance on the concrete surface or exposed metal surface during the oxidation stage , Radioactive substances enter the interior of oxidizing substances as time goes by, therefore, high concentrations of radioactive substances are accumulated on the walls or metal surfaces of nuclear power plants. Such contamination by radioacti...

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Problems solved by technology

[0010] The above-mentioned prior art relates to the content of pollution removal in nuclear power plants, the content of the surface of iron and steel materials, and the content of simple air cleaning, and cannot fully meet the pollution of the general living environment caused by the accident of the nuclear power plant. Removed content

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