Abstract
Small constrained beryllium pebble beds as well as unconstrained beryllium pebbles have been irradiated within HIDOBE-01 experiment at HFR, Petten, the Netherlands. Beryllium pebbles with 1mm diameter produced by Rotating Electrode Method (REM) were investigated after irradiation at 630, 740, 873, and 948K up to helium production of 3000appm. Intensive pore and bubble formation occurs in beryllium after 873K irradiation. In the contact zones of the pebbles enhanced pore formation takes place. Oxidation of beryllium pebble external surfaces is accompanied by partial destruction of oxide layers owing to their high brittleness. Strong interactions between beryllium pebbles and platinum foil, as well as between beryllium and stainless steel at contact zones occur at 873 and 948K.
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