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Report No.

Research for the improvement of SCC evaluation method including the effect of radiation on water, 3; Influence of materials and dissolved oxygen related to oxide film structures on stainless steel under $$gamma$$-ray irradiation in high temperature water

Yamamoto, Masahiro ; Nakahara, Yukio ; Kato, Chiaki   ; Tsukada, Takashi ; Suzuki, Kazuhiro; Hatakeyama, Yuichi; Watanabe, Atsushi*; Fuse, Motomasa*

It is well known that the decomposition of water by irradiation results in the formation of oxidants, such as hydrogen peroxide (H$$_{2}$$O$$_{2}$$) and radical species. The oxidant such as H$$_{2}$$O$$_{2}$$ promote nobler electrochemical corrosion potential (ECP) of stainless steels (SSs) and change oxide instructors as corrosion products on stainless steels surface. In this work, the effects of $$gamma$$-ray irradiation and structure on the corrosion of Type 316L SS and 304L SS in high-temperature water of 288C were examined. We also consider structures of the oxide film on the stainless steel using transmission electron microscope (TEM) and Raman spectroscope in order to show the differences made by the irradiation and structure. In addition, the effect of diffusion restriction and surface reactions may become more significant Inside crevices, so that the environments are expected to be different from those in the outsides.



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