Method of chemical decontamination

Details Method of chemical decontamination Method of chemical decontamination

G - Physics

21

F

G21F 9/00 (2006.01) G21C 17/022 (2006.01)

Patent

CA 2317795

The object is to suppress a decrease of thickness due to corrosion of structural members and to achieve a removal of radionuclides with good efficiency in a nuclear power plant. Oxidation decontamination is first conducted. An aqueous potassium permanganate solution is supplied from a circulation line (3) to a reactor pressure vessel (36), which is a stainless steel structural member, and a reactor water cleanup system piping (40) and a drain piping (46), which are carbon steel structural members. These structural members are oxidation-decontaminated by the action of potassium permanganate. Then the above-mentioned structural members are reduction-decontaminated by using an aqueous oxalic acid solution. The aqueous oxalic acid solution contains hydrazine.

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