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Report No.

Model development and verifications for fission gas inventory and release from high burnup PWR fuel during simulated reactivity-initiated accident experiment at NSRR

Suzuki, Motoe; Udagawa, Yutaka  ; Sugiyama, Tomoyuki ; Nagase, Fumihisa 

Behavior of fission gas release (FGR) analysis is performed for the high burnup PWR fuels which are pulse-irradiated in the simulated Reactivity-Initiated Accident (RIA) experiment conducted at NSRR (Nuclear Safety Research Reactor) in Japan Atomic Energy Agency. The FGR model consists of two main parts: FEMAXI-7 calculates fission gas bubble growth in grain boundaries during base-irradiation, while RANNS performed the grain separation and burst release of gas from grain boundary inventory in the rapidly heated pellet in the RIA experiment. The calculated results are compared with the measured data, which resulted in a rough agreement for the amount of fission gas in pellet and burst FGR.



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