The tritium release from neutron-irradiated beryllium pebbles, irradiated under different helium production (0.5-1.0x10(3) appm He) and dpa (4.2-8.6) conditions, was studied. From these results, it was clear that the apparent diffusion coefficient at 600 degreesC was significantly affected by irradiation conditions, but returned to normal values at 900 degreesC, apparently due to thermal annealing. Multiple peaks in the tritium release curve at 900 degreesC were observed. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 12]
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