| 摘要 |
PROBLEM TO BE SOLVED: To make a chemical cleaning executable while maintaining a proper concentration of iron by elution of iron ions or increasing the iron ion concentration in a system when it becomes impossible to maintain the irreducibly minimal iron concentration during the chemical cleaning. SOLUTION: Where structures such as piping and equipment used in radiation handling facilities are set as objects to be cleaned 1, a cleaning liquid circulation system 4 is connected to the objects 1, and cleaning liquid 3 including chemical is circulated for chemically cleaning oxide film on the surface of the structure in this chemical cleaning device. A corrosion restricting line 21 for restricting corrosion of base metal of the subject 1 is provided in a part of the cleaning liquid circulation system 4. The corrosion restricting line 21 is composed as a line 23 including carbon steel or low alloy steel connected to cleaning liquid circulation piping 5 in the cleaning liquid circulation system 4, so that the carbon steel or low alloy steel can be brought into contact with the cleaning liquid.
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