Program of in-pile IASCC testing under the simulated actual plant condition; Development of technique for in-pile IASCC initiation test in JMTR

Ugachi, Hirokazu ; Tsukada, Takashi ; Matsui, Yoshinori ; Kaji, Yoshiyuki  ; Tsuji, Hirokazu; Nagata, Nobuaki*; Dozaki, Koji*; Takiguchi, Hideki*

Irradiation assisted stress corrosion cracking (IASCC) is caused by the synergistic effects of neutron irradiation, stress and corrosion by high temperature water. It is, therefore, essential to perform in-pile SCC tests, which are material tests under the conditions simulating those of actual LWR operation, in order to clarify the precise mechanism of the phenomenon, though mainly out-of-pile SCC tests for irradiated materials have been carried out in this research field. This paper will describe the current status of the development of several techniques for in-pile SCC initiation tests in JMTR.