Abstract
A kinetic model for the oxidation of a UO₂ pellet to U₃O? powder has been suggested by considering the mass transfer and the diffusion of oxygen molecules. The kinetic parameters were estimated by a fitting of the experimental data. The activation energies for the chemical reaction and the product layer diffusion were calculated from the kinetic model. The oxidation conversion of a UO₂ pellet was simulated at various operating conditions. The suggested model explains the oxidation behavior of UO₂ well.
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