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The research on nuclear fuel includes experimental measurements of the thermochemical properties of fuels including fission products. These include non-oxide concepts such as uranium nitrides and silicides, and composite fuels as well. The measurements together with extant data are being used to generate accurate representations of the complex, multicomponent phases that make up fuel undergoing burnup. The models being used bridge the gap between atomistics which describe defect concentrations and the energetics that allow prediction of composition, solubilities, and chemical potentials. The work also includes determinations of compatibility of alternate clad materials in reactor systems coupled with thermochemical modeling of behavior. The research is being performed collaboratively with Oak Ridge National Laboratory, Los Alamos National Laboratory, and the Westinghouse Company.
