[2G08-12] Fukushima Daiichi NPS Accident

[2G09] Estimation of the In-Depth Debris Status of Fukushima Unit-2 and Unit-3 with Multi-Physics Modeling

(4)Consideration on possible RPV-boundary failure modes of Unit 2

*IKKEN SATO¹, Akifumi Yamaji², Masahiro Furuya², Yuji Ohishi³, Xin Li², Hiroshi Madokoro¹, Hirofumi Fukai² (1. Japan Atomic Energy Agency, 2. Waseda University, 3. Osaka University)

Keywords:RPV failure modes, Fuksushima Daiichi NPP Unit 2, relocation to pedestal, reactor interior observation results, internediate work stage

As part of the combined effort to reveal in-depth fuel debris status of the damaged Fukushima Unit-2 and Unit-3 reactors, possible RPV-boundary failure modes of Unit 2 have been considered. Three possible RPV-boundary failure modes are proposed based on information from internal investigations on this unit. It is intended in our future research to confirm and/or modify this assumption with analyses and experiments where appropriate.