Radiation effects of ADS target window materials on liquid metal corrosion

Okubo, Nariaki   ; Kondo, Keietsu  ; Kitamura, Akane; Okuno, Yasuki

Research and development of ADS and TEF-T have been done by JAEA. ADS and TEF-T adopt liquid lead bismuth eutectic (LBE) for both spallation target and coolant for the non-critical core. Irradiation and corrosion behaviors of steel materials in LBE are one of the important issues. High energy proton beam and spallation neutron irradiation will cause high dose of displacement damage and high concentration of transmutation gas, helium and hydrogen, simultaneously, in the target window material. At once, the materials will be influenced by the corrosion and erosion, which depends on the irradiation temperature and oxygen concentration in LBE, under LBE flow. Then, the irradiation data for material properties of corrosion/erosion and mechanical changes in flowing LBE is necessary to design and evaluate lifetime of ADS components. It is possible that the TEF-T facility will achieve the irradiation, which covers the ADS conditions of temperature from 450 to 550 and the displacement damage up to 20 dpa as designed for ADS target window. Material issues for the target window, irradiation plan of TEF-T, and the present activities for material test proceeded in static LBE pot and LBE loop systems will be presented.