Effect of water radiolysis on surface oxide film formed on SUS316L in -ray irradiated high temperature water

Yamamoto, Masahiro ; Kato, Chiaki   ; Sato, Tomonori  ; Nakahara, Yukio ; Tsukada, Takashi ; Watanabe, Atsushi*; Fuse, Motomasa*

Major corrosion problems of light water reactor (LWR) which are represented by stress corrosion cracking are affected by dissolved oxygen (DO) concentration in feed water. Many corrosion tests were conducted with the parameter of DO values. Oxygen source of an actual LWR is radiolysis of cooling water and also HO is generated. The effect of these species created by water radiolysis to corrosion of structural material was not sufficiently examined. -ray irradiated experiments were conducted in high temperature water condition using type 316L stainless steels with crevice. The calculation of radiolysis products was not estimated by the effect of radiolysis products. From these results, much complicated reaction seemed to occur at the -ray irradiated crevice portion.