Abstract
The BEATRIX-II irradiation experiment is an in situ tritium release experiment to evaluate the stability and tritium release characteristics of Li 2 O under fast neutron irradiation to extended burnups. A thin annular ring specimen capable of temperature changes was irradiated in phase I of the experiment to a lithium burnup of 5%, The primary emphasis of the test plan was to determine the effect and interrelationship of gas composition and temperature on the tritium recovery from Li 2 O. Temperature changes in the range from 500 to 650°C resulted in a decreasing tritium inventory with increasing temperature and a series of specific temperature changes were carried out at intervals throughout the experiment to characterize the effect of burnup. Decreasing the amount of hydrogen in the sweep gas resulted in an increase in the tritium inventory in the Li 2 O specimen. The tritium recovery during startup and shutdown was observed to be strongly influenced by the composition of the sweep gas.
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