Development of failure mitigation technologies for improving resilience of nuclear structures, 5; Resilience improvements of fast reactors by failure mitigation for beyond design high temperature accidents

Futagami, Satoshi  ; Ando, Masanori ; Yamano, Hidemasa   

To enhance resilience of next-generation nuclear structures, it is necessary to develop design methodology that mitigates impacts of failure caused by extremely high temperature conditions which might lead to a severe accident. In this study, structural analysis under extreme high temperature was conducted in a next-generation SFR with hanged reactor vessel (RV). This study has conducted the detailed structural analysis of the RV and GV in the loop-type SFR using the FINAS/STAR code. And CV was simply modeled to confirm the constraint effect on the deformation (expansion) of RV. From the structural analysis results under high temperature condition at LOHRS, deformation behavior and the areas that should be focused on to mitigate impacts of failure were understood. And CV constraint effect was confirmed to enhance the structural resilience.