Abstract
A theoretical model currently developed for the prediction of spatial distribution of inert gases near open surface or grain boundaries of reactor materials has been used for the description of fission gas disposition in single grains of oxide nuclear fuel. The central concept of the model follows from the assumption that bubble migration and coalescence is a main mechanism of bubble nucleation and growth. Both bubble random motion and bubble migration due to the thermal gradient are considered. From the comparison between model calculations and available electron probe microanalysis (EPMA) results, it was concluded that the spatial xenon profile and its temperature dependence in the temperature interval considered (1573–1873 K) may be satisfactorily reproduced by model results. It was established that under the conditions discussed the main cause of spatial inhomogeneity of fission gas is an action of the thermal gradient.
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