Abstract
Electron probe microanalysis has been used to determine quantitative profiles of the fission products caesium, xenon and barium in the coatings of UO 2 HTR fuel particles irradiated for up to 140 days to burn-ups of between 5% and 11% heavy atom fission at temperatures of 1100–1500°C. The xenon profiles were typical of recoil. Barium profiles showed a peak due to recoil but also a low level ‘tail’ extending to the silicon carbide layer indicating a fast diffusing barium species. In contrast to barium, strontium profiles were not observed. Caesium was the most abundant fission product in the inner pyrocarbon coating. The profiles often extended to the silicon carbide layer where a marked fall in caesium concentration was observed. Some profiles displayed zones of fairly constant caesium concentration which it is suggested correspond to caesium/pyrocarbon ‘compound’ formation as opposed to physical aspects of the manufacturing process.
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