Abstract
BEATRIX-II Phase I and II were in-situ tritium recovery experiments to characterize the behavior of ceramic breeders irradiated to high burn-up using the fast flux test facility (FFTF). A thin-walled, Li 2O-sintered ring specimen and single crystals specimen were irradiated to total lithium burn-ups of about 5 at%. Scanning electron microscopy of the ring specimen in Phase II revealed a substantial increase of open porosity and platelet-shaped grains and a decrease in grain size for most parts of the specimens. At the top end of the specimen hexagonal-shaped bubbles were observed in addition to the increase of porosity and the decrease of grain size. The increase of open porosity and the decrease of grain size were considered to arise from a significant link-up of the bubbles. Such increase of open porosity led to volumetric swelling in the order of 20%. Fracture surfaces of the single crystals exhibited morphological changes resembling blisters.
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