Uranium silicides have proven of interest as advancedtechnology reactor fuels due to their enhanced thermalconductivity and high uranium density (U_3Si and U_3Si_2)compared to traditional UO_2. However, susceptibility tooxidation and wash out, in the event of a cladding breech,could limit the potential for deployment of silicides asaccident tolerant fuels. Mitigating the water reaction forU3Si2 could enable its use as an accident tolerant, highuranium density fuel or as a composite fuel constituent.Presented are the fabrication methods, including meltsynthesis, as melted microstructures, and phasecomposition for U_3Si_2 alloyed with Cr, Y, and Nb rangingfrom 2-12 volume percent. Finally, the modified reactionkinetics for alloyed compositions will be presented andimpact to water-cooled reactor implementation discussed.
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