Abstract
Out-of-reactor tritium release from well-characterized solidified melt particles of lithium oxide is investigated for dependence on temperature, sweep gas flow rate, effect of hydrogen addition to the processing gas, and particle size. Solid-phase diffusion, characterized by diffusion coefficient in D(cm 2/s) = −(13.2 ± 3.7) − (27.6 ± 12 kJ/mol)/RT , is shown to control long-term escape for temperatures 673 K – 923 K. Admixture of 2.4 vol. % H 2 to the sweep stream appears to promote initial tritium release.
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