Abstract
The elastic moduli of simulated dry process fuels with varying composition and density were measured in order to analyze the mechanical properties of a dry process fuel pellet. Resonant ultrasound spectroscopy(RUS) which can determine all elastic moduli with one set of measurements for a rectangular parallelepiped sample was used to measure the elastic moduli of UO<TEX>$_{2}$</TEX> and simulated dry process fuel. The simulated dry process fuel showed a higher value of Young's modulus than UO<TEX>$_2$</TEX> due to the presence of metallic precipitates and solid solution elements in the UO<TEX>$_{2}$</TEX> matrix. The correlation between Young's modulus and porosity(P) of simulated dry process fuel was found to be 231.4-651.8 P (GPa) at room temperature. Dry process fuel with a higher burnup showed higher Young's modulus because total content of fission product element was increased.
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