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US 7,622,627 B2Granted
System and method for chemical decontamination of radioactive material
AssigneeKabushiki Kaisha Toshiba
InventorsMasami Enda, Yumi Yaita, Mitsuyoshi Sato, Hitoshi Sakai, Takeshi Kanasaki, Ichiro Inami
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Abstract
A system for chemically decontaminating radioactive material.
Claims19
A system for chemically decontaminating radioactive material, the system comprising:
- a decontamination tank for containing radioactive material and decontamination liquid;
- a direct current power source for providing potential between the radioactive material and an anode;
- and
- a circulation loop connected to the tank for circulating the decontamination liquid, the circulation loop having:
- a decontamination agent feeder for feeding the decontamination liquid that is reductive and that is a mixture of mono-carboxylic acid and di-carboxylic acid into the decontamination liquid;
- a hydrogen peroxide feeder for feeding hydrogen peroxide into the decontamination liquid to decompose the mono-carboxylic acid in 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 to decompose the di-carboxylic acid in the decontamination liquid;
- wherein the mono-carboxylic acid is formic acid and the di-carboxylic acid is oxalic acid, and
- wherein a mole fraction of formic acid in the decontamination liquid is 0.9 or more.
8 more elements
A system for chemically decontaminating radioactive material, the system comprising:
- a decontamination tank for containing radioactive material and a decontamination liquid;
- a direct current power source for providing potential between the radioactive material and an anode;
- and
- a circulation loop connected to the tank for circulating the decontamination liquid, the circulation loop having:
- a decontamination liquid feed comprising a reductive mixture of formic acid and oxalic acid and a decontamination liquid feeder for feeding said mixture of formic acid and oxalic acid into the decontamination tank;
- a hydrogen peroxide feed and feeder for feeding hydrogen peroxide into the decontamination liquid to decompose the formic acid in 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 to decompose the oxalic acid in the decontamination liquid;
- wherein the mole fraction of formic acid in the decontamination liquid is 0.9 or more.
7 more elements
Dependencies are inferred from the claim text.