CHEMICAL DECONTAMINATION SYSTEM FOR DISSOLVING CHEMICALLY OXIDE LAYER FORMED ON SURFACE OF CONTAMINATED COMPONENT AND DECONTAMINATING METHOD THEREOF

摘要

PURPOSE: A chemical decontamination system for dissolving chemically an oxide layer formed on a surface of a contaminated component and a decontaminating method thereof are provided to enhance a dissolving rate and obtain decontamination performance equivalent to oxalic acid without performing a process or using a device for reducing trivalent iron ions into bivalent iron ions. CONSTITUTION: A decontaminating method includes a reducing and dissolving process and an oxidizing and dissolving process. The reducing and dissolving process is performed to bring a surface of a radioactive part into contact with reducing decontamination liquid including mono-carboxylic acid and di-carboxylic acid as dissolvent. The oxidizing and dissolving process is performed to bring the surface of the radioactive part into contact with oxidizing decontamination liquid including oxidizer.