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Conference Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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ANS joins others in seeking to discuss SNF/HLW impasse
The American Nuclear Society joined seven other organizations to send a letter to Energy Secretary Christopher Wright on July 8, asking to meet with him to discuss “the restoration of a highly functioning program to meet DOE’s legal responsibility to manage and dispose of the nation’s commercial and legacy defense spent nuclear fuel (SNF) and high-level radioactive waste (HLW).”
D. R. Olander
Nuclear Science and Engineering | Volume 82 | Number 2 | October 1982 | Pages 190-205
Technical Paper | doi.org/10.13182/NSE82-A28701
Articles are hosted by Taylor and Francis Online.
A detailed model of the interaction of ruthenium and urania is developed and compared to experimental data. The mechanism involves physical solution of the metal in the grain boundaries of the ceramic followed by simultaneous diffusion and chemical reaction to produce URu3 intergranular inclusions. The process occurs only when the oxide is substoichiometric, the reduction being effected by oxygen absorption by the refractory metal crucible containing the specimen. Reaction ceases when the URU3 product in the grain boundary reaches a thickness that prevents removal of the other reaction product, oxygen. Fitting the model predictions to the isothermal ruthenium spreading data from a source plane of the metal held between oxide pellets provides quantitative estimates of the parameters of the model The theory also correctly predicts the shape and magnitude of ruthenium migration in UO2 in a temperature gradient, in which thermal diffusion does not appear to play a significant role.