Computer simulation for short-term irradiation behavior of mixed oxide fuels containing Am in a fast reactor

Yokoyama, Keisuke ; Ikusawa, Yoshihisa   ; Uwaba, Tomoyuki ; Morimoto, Kyoichi ; Tanaka, Kosuke  ; Hirooka, Shun 

We have developed analytical models for describing the effects of MAs on fuel physical properties such as vapor pressure, thermal conductance and density. These models were incorporated into a computer simulation code CEDAR, which predicts mechanical and thermal behaviors of a fuel pin irradiated in FRs. CEDAR was applied to the short-term irradiation experiments of the fuel pins in the experimental fast reactor Joyo. Mechanisms of these behaviors were investigated through the comparison between the PIEs and simulations and analyzing them.