System and method for chemical decontamination of radioactive material

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.