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Fusion Science and Technology
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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.
S. Tanaka, D. Yamaki, M. Yamawaki
Fusion Science and Technology | Volume 19 | Number 3 | May 1991 | Pages 1018-1023
Blanket Technology | doi.org/10.13182/FST91-A29476
Articles are hosted by Taylor and Francis Online.
Modeling of the tritium reaction at the surface of Li2O was performed using data obtained in in-situ and out-of-pile tritium release experiments. In this model the effects of H2O and H2 in the sweep gas were considered. On the surface, recombination of -OT and dissociatively adsorbed -OH was considered to produce HTO. In addition to this, HT was considered to be produced by the reaction of surface tritium with dissociated hydrogen on the surface. On the surfaces of tubes and the solid breeder itself, conversion reactions of HTO to HT by H2 were also considered. Tritium inventory on the solid breeder surface and the released chemical form were calculated. They agreed fairly well with those of TTTEx in-situ tritium release experiments. It was found that H2O as well as H2 in the sweep gas affects tritium release behavior.