Abstract
The BEATRIX-II, Phase II irradiation experiment was an in situ tritium recovery experiment that evaluated tritium release characteristics of Li2O thin-walled ring under a fast neutron irradiation up to 5% 6Li burnup. The primary emphasis of the Phase II test was to determine interrelationship of sweep gas composition and temperature on the tritium recovery from Li2O. Decreasing the temperature and the amount of hydrogen in the sweep gas resulted in an increase in the tritium inventory of the Li2O specimen. Hydrogen additions to the helium sweep gas had a significant effect on the response of the ionization chamber used for measuring the rate of tritium recovery. Correction procedures were developed to account for the effect of sweep gas compositions and ionization chamber backgrounds. Integration of the corrected tritium recovery over the duration of the experiment resulted in a net tritium mass balance within the experimental uncertainty.
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