The effects of neutron irradiation on microstructural evolution and tritium retention of beryllium are being studied by post irradiation long term annealing experiments and by optical microscopy. The long-term tritium annealing tests of beryllium, irradiated in the so-called EXOTIC capsules, showed after a few hundred hours at 600℃, tritium is still released by burst release by the interconnection of bubbles and pores. The long-term irradiation exposure of the beryllium pebbles with stainless steel showed interaction at pebble-wall interfaces. The detailed metallographic analyses are presented and discussed.
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