Effect of dissolved oxygen on the corrosion behavior at the crevice surface in high temperature water under gamma-ray irradiation

Sato, Tomonori  ; Hata, Kuniki ; Kato, Chiaki   ; Igarashi, Takahiro  

To evaluate the effects of dissolved oxygen concentration to water quality within SCC crack and the distribution of water quality in the depth direction under irradiation, immersion tests of stainless steel specimens given a gap and water radiolysis calculations for the water quality in the crevice gap were performed. As a result, it was confirmed that FeO was formed in the entire area within the crevice regardless of the dissolved oxygen concentration. It was also estimated that under irradiation, the oxidant species produced directly by radiolysis in the crack are consumed by the oxide growth, and anion enrichment occurs in the crack even in the irradiation conditions.