Chemical decontamination method and treatment method and apparatus of chemical decontamination solution
AssigneeKabushiki Kaisha Toshiba
InventorsMasami Enda, Yumi Yaita, Norihisa Saito, Hiromi Aoi, Ichiro Inami, Hitoshi Sakai, Satoshi Hiraragi, Yoshinari Takamatsu
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Abstract
Chemical decontamination method of dissolving oxide film adhered to contaminated component including, preparing decontamination solution in which ozone is dissolved and oxidation additive agent, which suppresses corrosion of metal base of the contaminated component, is added, and applying the decontamination solution to the contaminated component, thereby to remove the oxide film by oxidation.
Claims17
A chemical decontamination method of dissolving an oxide film of a surface of a contaminated component comprising:
- preparing a first decontamination solution in which ozone is dissolved and an oxidation additive agent for suppressing corrosion of a metal base of the contaminated component is added;
- and
- applying the first decontamination solution to the contaminated component to remove by oxidation the oxide film of the surface of the contaminated component.
A treatment method of chemical decontamination solution, comprising:
- preparing a chemical decontamination solution, in which organic acid is dissolved, for dissolving an oxide film adhered to a contaminated component;
- and
- electrolyzing the chemical decontamination solution to reduce Fe3+ ions in the chemical decontamination solution to Fe2+ ions at a cathode and to oxidize Fe2+ ions to Fe3+ ions at a anode and to adjust the valance of iron ions in the chemical decontamination solution.
A treatment method of chemical decontamination solution, comprising:
- preparing a chemical decontamination solution, in which organic acid is dissolved, for dissolving oxide film adhered to a contaminated component;
- electrolyzing the chemical decontamination solution to decompose the organic acid dissolved in the chemical decontamination solution at an anode;
- and
- adding ozone in the chemical decontamination solution to decompose the organic acid dissolved in the chemical decontamination solution.
A treatment apparatus comprising:
- a decontamination bath to contain a contaminated component;
- and
- a circulation system into which a chemical decontamination solution flows and from which waste fluid drains after the decontamination;
- the circulation system including an electrolysis device to electrolyze the chemical decontamination solution, an ion exchange resin column to collect ions generated by the electrolysis device, and a dissolution mixer of ozone gas to dissolve ozone into the chemical decontamination solution, wherein the electrolysis device, the ion exchange resin and the dissolution mixer are connected in series from an outflow side of the circulation system to an inflow side of the circulation system.
Dependencies are inferred from the claim text.