SURFACE TREATMENT METHOD AND SURFACE TREATMENT SYSTEM OF HEAT TRANSFER PIPE OF STEAM GENERATOR

摘要

PROBLEM TO BE SOLVED: To provide a method and a system capable of suppressing Ni elution from inside a heat transfer pipe during PWR operation, and suppressing decline of AOA potential or rise of exposure dosage.SOLUTION: A surface treatment method of a heat transfer pipe of a steam generator comprising a Ni-based alloy includes steps for: conducting treatment liquid into the heat transfer pipe; adjusting pH of the treatment liquid to be 5.5 or higher and 6.5 or lower; and adjusting a surface potential of the heat transfer pipe to be 0 V.vs.SHE or higher. In the surface treatment method, a surface film comprising an oxide of Fe and/or a complex oxide of Cr and Fe is formed on the surface of the heat transfer pipe.