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

Mohamad, A. B.; 宇田川 豊; 根本 義之; 山下 真一郎

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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$$_{2}$$. 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$$_{2}$$. 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.

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