Abstract
The thermal diffusivity and the thermal expansion of simulated DUPIC fuel were measured using a laser flash apparatus in the temperature range from room temperature to 1473 K and dilatometer in the temperature range from room temperature to 1900 K, respectively. The relative density of simulated DUPIC fuel is lower than that of UO2 fuel. At a low temperature to 600 K, the difference of the relative densities is small and increases as temperature increases. As temperature increases to 1900 K, the relative density of the simulated DUPIC fuel decreases to 93.764 % of the initial density at 298 K. The thermal conductivity of simulated DUPIC fuel is lower than that of UO2 fuel. The difference of thermal conductivity between simulated DUPIC fuel and UO2 fuel is large at room temperature, and it decreases as the temperature increases. The thermal conductivity of simulated DUPIC fuel decreases from 5.77 W/m.K (78.12 % that of UO2) at 373 K to 2.35 W/nr K (87.79 % that of UO2) at 1473 K.
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