[2A15-21] Reactor Pressure Vessel Steels

[2A15] Prediction and Extension of Lifetime of Reactor Pressure Vessel

(1) Irradiation-induced Precipitate G-phase Ni₁₆Si₇Mn₆

*Yoshitaka Matsukawa¹, Daiki Watanabe¹, Sadahiro Tsurekawa¹, Nina Manon Abad¹, Hiroaki Muta², Kenta Yoshida³, Ryuta Kasada³, Masatake Yamaguchi⁴, Hideki Yuya⁵, Minako Endou⁵ (1. Kumamoto Univ., 2. Osaka Univ., 3. Tohoku Univ., 4. JAEA, 5. Chubu Electric Power)

Keywords:light water reactors, pressure vessel, embrittlement, trend curve, precipitates, compounds, dissolution, lifetime extension, annealing

In-depth analysis on atomic diffusion during dissolution of the G-phase Ni₁₆Si₇Mn₆ into the matrix of pressure vessel steels has been performed by means of diffusion couple.