Abstract
Results of oxidation experiments on high-burn-up UO 2 are presented where fission-product vaporisation and release rates have been measured by on-line mass spectrometry as a function of time/temperature during thermal annealing treatments in a Knudsen cell under controlled oxygen atmosphere. Fractional release curves of fission gas and other less volatile fission products in the temperature range 800–2000 K were obtained from BWR fuel samples of 65 GWd t −1 burn-up and oxidized to U 3O 8 at low temperature. The diffusion enthalpy of gaseous fission products and helium in different structures of U 3O 8 was determined.
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