Tritium permeation experiments using reduced activation ferritic/martensitic steel tube and erbium oxide coating |
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| Affiliation: | 1. The University of Tokyo, Tokyo, Japan;2. Idaho National Laboratory, Idaho Falls, ID, USA;3. National Institute for Fusion Science, Toki, Gifu, Japan;1. Scientific Technical Center SINTEZ, D.V. Efremov Institute, 196641 St. Petersburg, Russia;2. I.I. Polzunov Scientific & Development Association on Research and Design of Power Equipment, 191167 St. Petersburg, Russia;1. Korea Atomic Energy Research Institute, Daejeon, Republic of Korea;2. National Fusion Research Institute, Daejeon, Republic of Korea;1. Korea Atomic Energy Research Institute, Daejeon, Republic of Korea;2. National Fusion Research Institute, Daejeon, Republic of Korea;1. Technical University of Catalonia (UPC), Jordi Girona 1-3, 08034 Barcelona, Spain;2. Technology for Fusion (T4F) Research Group, GREENER, Department of Heat Engines, Spain;3. Technology for Fusion (T4F) Research Group, GREENER, Department of Physics and Nuclear Engineering, Spain;4. EURATOM-CIEMAT Association, 28040 Madrid, Spain |
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| Abstract: | Low concentration tritium permeation experiments have been performed on uncoated F82H and Er2O3-coated tubular samples in the framework of the Japan-US TITAN collaborative program. Tritium permeability of the uncoated sample with 1.2 ppm tritium showed one order of magnitude lower than that with 100% deuterium. The permeability of the sample with 40 ppm tritium was more than twice higher than that of 1.2 ppm, indicating a surface contribution at the lower tritium concentration. The Er2O3-coated sample showed two orders of magnitude lower permeability than the uncoated sample, and lower permeability than that of the coated plate sample with 100% deuterium. It was also indicated that the memory effect of ion chambers in the primary and secondary circuits was caused by absorption of tritiated water vapor that was generated by isotope exchange reactions between tritium and surface water on the coating. |
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| Keywords: | Tritium Permeation Coating Erbium oxide Memory effect |
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