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September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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Deep geologic repository progress—2025 Update
Editor's note: This article has was originally published in November 2023. It has been updated with new information as of June 2025.
Outside my office, there is a display case filled with rock samples from all over the world. It contains a disk of translucent, orange salt from the Waste Isolation Pilot Plant near Carlsbad, N.M.; a core of white-and-bronze gneiss from the site of the future deep geologic repository in Eurajoki, Finland; several angular chunks of fine-grained, gray claystone from the underground research laboratory at Bure, France; and a piece of coarse-grained granite from the underground research tunnel in Daejeon, South Korea.
P. Schira, E. Hutter
Fusion Science and Technology | Volume 14 | Number 2 | September 1988 | Pages 608-613
Tritium Processing | Proceedings of the Third Topical Meeting on Tritium Technology in Fission, Fusion and Isotopic Applications (Toronto, Ontario, Canada, May 1-6, 1988) | doi.org/10.13182/FST88-A25201
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20 g of uranium powder was used in a laboratory setup at temperatures between 500 and 900 °C to study the retention of 1% each of O2, N2, NH3, CO2, and CH4 either as single impurities or three-component mixtures in H2. O2, NH3, and N2 as single impurities can be retained down to residual concentrations of 1 to 20 ppm at 500 °C. This is also true of CO2, but a large volume of CH4 is produced in this case. CH4 as a single impurity is not retained effectively below 900 °C. O2 redecomposes the uranium nitrides and carbides already formed. The achievable degrees of conversion are between 10% and 100 % for the reactions and increase as the temperature is raised.
