[1I13-17] characteristics of fuel cladding

[1I14] The evaluation on the applicability of SiC composite fuel cladding for the Accident Tolerant Fuel to the existing PWR plants

(2)Evaluations of severe accident tolerance for SiC

*Yoshinori Yamakoshi¹, Manabu Miyata¹, Kazuki Kirimura¹, Masatsugu Mizokami¹, Shinya Kosaka¹, Shinichiro Yamashita², Fumihisa Nagase² (1. Mitsubishi Heavy Industries, ltd., 2. Japan Atomic Energy Agency)

Keywords:accident tolerant fuel, SiC composite, fuel cladding, PWR, severe accident

Evaluations were performed for severe accident tolerance when SiC composite fuel is applied as an accident tolerant fuel using severe accident analysis code. Intended accident sequences are large pipe break LOCA and SBO both of which lead to core melt. In both accident sequences, the timing of core melt and relocation of molten core is delayed in comparison with conventional fuel, which showed a possibility of core injection recovery. It was also confirmed that the amount of hydrogen generated is significantly reduced in comparison with conventional fuel.