Thermodynamic behavior of (U,Pu) mixed-oxide fuels |
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Authors: | N.A. Javed |
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Affiliation: | Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA |
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Abstract: | Transpiration experiments were performed at temperatures between 1000 and 1700°C to study the thermodynamics and defect structure of hypostoichiometric UO2-20 wt % PuO2 solid-solution systems. The oxygen partial pressures were established by using flowing mixtures. After equilibration, the quenched products were analyzed by chemical, X-ray, neutron-diffraction and metallographic techniques. The versus temperature curves for the mixed oxide with different oxygen-to-metal ratios were plotted.Based on X-ray, neutron diffraction and metallographic data, it was concluded that the 20 wt % PuO2 mixed oxide exists as a single phase under normal conditions, even at an oxygen-to-metal ratio as low as 1.92.The data from density measurements and neutron-diffraction analysis indicated that the predominant defects in the hypostoichiometric UO2-20 wt % PuO2 are anion vacancies. |
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