[2K01-04] Evaluation of Safety in Accident

[2K04] Study on physical mechanism in aging phenomenon of fuel debris

(3)Transition of total crack length by cyclic temperature fluctuation under water in solidified molten materials.

*Seiya Suzuki¹, Yoichi Arai¹, Nobuo Okamura¹, Masayuki Watanabe¹ (1. JAEA)

Keywords:fuel debris, aging phenomenon, physical mechanism, crack, temperature shift

Clarification of aging phenomenon of fuel debris is one of the important issues because to evaluate that the safety during long term at defueling and storing. As a physical mechanism, we were investigated the effect of environmental temperature on the amount of cracks increased, and clarified the behavior of crack generation and propagation in submerged fuel debris.