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Uranium mononitride, UN, is considered a potential accident tolerant fuel dueto its high uranium density, high thermal conductivity, and high melting point.Compared with the relatively inert UO2, UN has a high reactivity in water,however, studies have not considered the significant effect of radiation, whichis known to cause corrosion of UO2. This study uses 0.1 M H2O2 to simulate theeffects of water radiolysis in order to compare the radiolytic corrosion ratesof UO2, UN, and U2N3 thin films at room temperature. X-ray reflectivity wasused to investigate the changes in film morphology as a function of H2O2exposure time, allowing changes in film thickness and roughness to be observedon the Angstrom length-scale. Results showed significant differences betweenUO2, UN, and U2N3, with corrosion rates of 0.083(3), 0.020(4), and 0.47(8) A/s,respectively, showing that UN corrodes more slowly than UO2 in 0.1 M H2O2.

Comparing the Corrosion of Uranium Nitride and Uranium Dioxide Surfaces with H2O2