Fuel performance analysis by using FEMAXI code for the fuel samples (HBC4, XM3) burned up to different level

異なる燃焼度の燃料試料(HBC4, XM3)についてのFEMAXIコードによる燃料ふるまい解析

Mohamad, A. B. ; 宇田川 豊  ; 根本 義之  ; 山下 真一郎   

Mohamad, A. B.; Udagawa, Yutaka; Nemoto, Yoshiyuki; Yamashita, Shinichiro

This work investigated the impact of fuel burnup on the fuel performance behavior by comparing the analytical results. The fuel performance behaviors were studied by using a fuel performance tool FEMAXI-8, which was established by JAEA. The simulation had been calculated under steady state as well as transient conditions: base and ramp irradiations. The melted radius was estimated from the interpolation of pellet center temperature and melting temperature of UO. The estimated melted radius of the HBC4 sample (burnup: 48 GWd/tU) was corresponded to the PIE data. However, for the XM3 sample (burnup: 27 GWd/tU), the estimated melted radius was underestimated than PIE values. It is expected that the fuel start to melt when the fuel center temperature was exceeded the melting temperature of UO. Even though further improvement seems to be required, our works revealed that FEMAXI-8 can reproduce well the experimental data of transient. The authors will discuss necessary improvement of the code, and influence of burnup level in the workshop.