Abstract
Fuel pellets composed of 70 vol % BeO-30 vol % UO 2 have been irradiated to a burnup of 55 per cent of the U 235 atoms (corresponding to 3.7 × l0 20 fissions per cc). The peak fuel temperature was 1100° C. The experiment was designed to study the effect of UO 2-fuel particle size on the performance of fuel pellets at temperatures, heat flux conditions, and burnups that are of interest to the Experimental Beryllium Oxide Reactor program. The coarse particle pellets showed little change in dimension and remained intact. The fine particle pellets fractured into several pieces. The release of fission gases from the fine particle pellets was less than 0.1 per cent. No fission gas release data were obtained for the coarse particle pellets.
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