[1I01-06] Fundamental property

[1I06] Development of accident tolerant control rod

(2)Reaction of candidate neutron absorber with high-temperature steam

*Kinya Nakamura¹, Hirokazu Ohta¹, Takanari Ogata¹ (1. CRIEPI)

Keywords:neutron absorber, accident tolerant control rod, light water reactor, high-temperature steam, rare-earth oxide

Reaction of candidate neutron absorber materilas, such as rare earth oxide RE₂O₃ (RE: Sm, Eu, Gd) and mixed oxide containing rare earth element, with high-temperature steam was investigated for development of accident tolerant control rod for light water reactors. As a result, (RE,Zr)O₂ and (RE,Hf)O₂ solid solution revealed high thermochemical and dimensional stability up to 1200C at least.