Abstract
Samples of UO 2 doped with small amounts of Nb 2O 5 or La 2O 3, and having various grain sizes, have been irradiated at 1500°C to 0.1% FIMA. At this low burn-up, gas release and swelling measurements show no dependence on dopant, but the Booth model prediction of swelling proportional to reciprocal grain size has been verified. Gas release does not fit the simple Booth model at the low releases measured, and shows a dependence on sample density, and hence surface area only. A model has been derived to explain these results. The rare gas diffusion coefficient in UO 2 at 1500°C has been measured to be 1.6 × 10 −19 m 2/s.
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