Abstract
to minimize the damage of base metals by the corrosion in this study. Type 304 stainless steel (304SS) and Inconel-600 (I-600) that are major components of the primary coolant system in pressurized water reactor were tested. To improve the integrity of base metal to the corrosion, we tested Ni2+, Fe3+, Cr6+, or Cu2+ by adding in NP solutions as a corrosion inhibitor and found that general and local corrosions were suppressed by the addition of Cu2+ ion. Decontamination performance and corrosion tests for NP(Cu) process with HYBRID (HYdrazine Base Reductive metal Ion Decontamination) process as a multi-step process were carried out and compared with existing processes such as citric-oxalic acid and oxalic acid. Our tests revealed that NP(Cu)-HYBRID process greatly inhibited local corrosions such as pits and Intergranular Attack. Moreover the proposed process was assured by the decontamination performance equivalent to other conventional processes.
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