The Stoichiometry and the Oxygen Potential Change of Urania Fuels During Irradiation

Abstract

A defect model for irradiated UO₂ fuel solid-solution was devised based on the defect structure of pure urania Using the equilibrium among fuel solid-solution and fission-products and the material balance within the fuel, the stoichiometry change of the urania fuel was traced with burnup This tracing method was applied to high burnup fuels and DUPIC, and the implications were discussed.