Abstract
Abstract The release of fission xenon from UO2 in the composition range between UO1.934 and UO2.250 has been studied during post-irradiation diffusion anneal experiments. The results are as follows: UO2−y: D0 = 4 × 102to 1.6 × 103cm2·s−1; ΔH = (6.0 ± 0.1) eV for 1400⩽T⩽2200°C. No correlation was found between D and O/U. UO2.000: D0 = 5 × 10−2to 5 cm2·s−1; ΔH = (3.9 ± 0.4) eV for 950⩽T⩽1700°C. UO2+x: D0= 1 × 10−8to 1 × 10−4cm2·s−1; ΔH = (1.7 ± 0.4) eV for 600⩽T⩽ 1300°C. No correlation was found between D and O U . Under an oxidizing atmosphere the gas release is characterized by an increase in the apparent D during an initial period, ti, which was found to be influenced by particle diameter and annealing temperature, but not by the initially existing O U ratio of the sample. Variations of the oxygen partial pressure in the course of several experiments were used to study this effect. The explanation which best fits the experimental observations is that the influence of the O U ratio on xenon diffusion occurs through an alteration of the trapping probability. The nature of the traps appears to be that of larger vacancy agglomerates.
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