The latter involves precipitation and growth of micron-size lenticular gas bubbles at the grain faces, and subsequent gas transfer to coalesced bubbles along GB triple junctions, through which release to the fuel rod free volume takes place. Diffusive transport of the gas generated within the fuel grains to the grain boundaries (GBs) is described along with intricate GB processes. Among the various issues involved in nuclear fuel analysis, modeling of fission gas release (FGR) in light water reactor (LWR) oxide fuel calls for the treatment of a complex combination of multiple concomitant processes,.
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