Deposition of radioactive corrosion products, such as Co-60, causes radiation field buildup in boiling water reactors (BWR) plants. In this study, deposition kinetics of Co-60 and elemental cobalt ions on stainless steels (SSs) and the effects of pre-oxidation on the suppression were evaluated in actual reactor water and laboratory autoclaves. Cobalt ions are incorporated as divalent cobalt oxides such as cobalt ferrite at the oxide/metal interface through corrosion. Therefore, a protective oxide film, which is preformed under suitable circumstances such as high temperature water with a certain amount of dissolved oxygen, can suppress the deposition. The oxide film containing aluminum has greater protectiveness.
National Association of Corrosion Engineers
1987
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