Abstract
The thermal conductivity of MOX fuel containing FP precipitates such as oxide and metallic inclusions was evaluated by using a finite element method. (U0.8Pu0.2)O2 and (M0.94Nd0.06)O2 (M: U0.8Pu0.2) were employed as the fuel matrix, and BaUO3 and Mo-Ru-Rh-Pd alloy as the inclusions. The dispersed phase size and concentration were determined from post irradiation examination results of about 10 at.% burnup MOX fuel. 2.5 vol.% of the spherical inclusions with the diameter of 25 μm were dispersed in the fuel matrix cube with a size of 400×400×400 μm. The effect of the inclusions on the thermal conductivity of the fuel pellet was calculated to be at most several percents, which is about one order lower than that of the dissolved FPs.
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