Sister Rod Destructive Examinations (FY2021) Appendix J: Leaching of High Burnup Used Nuclear Fuel in De-ionized Water

Abstract

have FNU values very close to unity under the respective relative errors. These nuclides generally form stable oxides in solid solutions with the UO2 matrix and are released when the uranium dissolves [21].Radionuclides 101 Ru, 103 Rh, and 140 Ce show lower than matrix dissolution, as seen from the ≤ 1 FNU values. The trends observed for Ru and Rh release were consistent with other leaching studies since they had lower mobilities within the ɛ phases and were dependent on the dissolution of the surface uranium atoms to be leached out [22]. Table J-6. FNU values for sample FHT-C as a function of time.