Abstract
Since tritium resources are very limited, not only for safety reason but also for tritium economy, tritium inventory in a reactor must be kept as small as possible. In the present tokamaks, however, hydrogen retention rate in their vacuum vessel is significantly large, i.e. more than 20% of fueled hydrogen is continuously piled up, which must not be allowed in a reactor. After the introduction of tritium as a hydrogen radioisotope, the paper summarizes present tritium issues in plasma wall interactions, in particular, fueling, retention and recovering, considering the handling of large amounts of tritium, i.e. confinement, leakage, contamination, permeation, regulations and tritium accountancy. Progress in overcoming such problems will be also presented.
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