The control of tritium inventory and permeation is crucial for the safe operation of fusion reactors. To measure these phenomena, a novel tritium experiment is introduced and used to measure tritium permeation through Eurofer97 at room temperature, with several possibilities for the downstream conditions: air or water and overhead air. A pre-loading condition was shown to be required for this experiment. This direct comparison revealed that tritium is preferentially found in the water phase and secondarily in the air phase.
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