To provide a highly corrosion-resistant reactor core material having excellent corrosion resistance, swelling resistance and stress corrosion cracking resistance under radiation exposure and under a high-temperature and high-pressure water environment.
As a member subjected to neutron irradiation in high-temperature water, austenitic steel containing at least either of Ti and Zr is used. To be concrete, the steel has a composition consisting of 0.005 to 0.04% C, ≤1% Si, ≤2% Mn, 23 to 28% Cr, 16 to 25% Ni, 0.5 to 3% Mo, 0.1 to 2% of at least either of Ti and Zr and the balance ≥50% Fe and further containing, other than the above, 1.0%, in total, of at least one or more elements among Pd, Pt and Hf. The steel is used as a constituent material for a reactor core of a nuclear reactor.
KUNIYA JIRO
MATSUURA MASAYOSHI
