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Division Spotlight
Fuel Cycle & Waste Management
Devoted to all aspects of the nuclear fuel cycle including waste management, worldwide. Division specific areas of interest and involvement include uranium conversion and enrichment; fuel fabrication, management (in-core and ex-core) and recycle; transportation; safeguards; high-level, low-level and mixed waste management and disposal; public policy and program management; decontamination and decommissioning environmental restoration; and excess weapons materials disposition.
Meeting Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
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Latest News
WIPP’s SSCVS: A breath of fresh air
This spring, the Department of Energy’s Office of Environmental Management announced that it had achieved a major milestone by completing commissioning of the Safety Significant Confinement Ventilation System (SSCVS) facility—a new, state-of-the-art, large-scale ventilation system at the Waste Isolation Pilot Plant, the DOE’s geologic repository for defense-related transuranic (TRU) waste in New Mexico.
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.
