Patent ID: 7772451
Filing Date: 2010-08-10
Classification: G21F,Y10S

Abstract:
1. A system for chemically decontaminating radioactive material which forms a passage for liquid to flow through, the system comprising: a circulation loop connected to the passage for circulating a decontamination liquid, the circulation loop comprising: a decontamination agent feeder feeding the decontamination liquid that is reductive and that is an aqueous solution comprising a mono-carboxylic acid and a di-carboxylic acid to the decontamination liquid; a hydrogen peroxide feeder feeding hydrogen peroxide to the decontamination liquid; an ion exchanger for separating and removing metal ions in the decontamination liquid; and an ozonizer for injecting ozone into the decontamination liquid or an oxidizer feeder feeding permanganic acid or permanganate to the decontamination liquid; wherein the system comprises only one circulation pump, and the only one circulation pump is comprised in the circulation loop; wherein the mono-carboxylic acid is formic acid and the di-carboxylic acid is oxalic acid, wherein the mole fraction of the formic acid in the decontamination liquid is 0.9 or more, wherein the system does not contain a device for reducing trivalent iron atoms into bivalent iron atoms, and wherein any acid present in the system is an organic acid.