[3F05-09] Light Water Reactor Materials

[3F07] Evaluation of irradiation embrittlement of a harvested reactor pressure vessel material from a domestic PWR plant

(1) Investigation of solute atom cluster formation

*Toru Oumaya¹, Terumitsu Miura¹, Katsuhiko Fujii¹, Koji Fukuya¹ (1. Institute of Nuclear Safety System, Incorporated)

Keywords:Reactor pressure vessel, Irradiation embrittlement, Harvested material, Solute atom cluster

Solute atom cluster formation of a harvested RPV material (A533B Cl.1, Cu 0.12wt.%, 2.9×10¹⁹ n/cm²) was investigated by 3D atom probe tomography. Cu rich solute atom clusters were observed and its volume fraction was within the data band of domestic surveillance specimen. Comparison with surveillance specimen of the same RPV revealed that both specimen had similar characteristics regarding solute atom cluster formation.