Fission-gas release from fuel at high burnup

Abstract

The release of fission gas from fuel pellets at high burnup is reviewed in the context of the safety analysis performed for reactor license applications. Licensing actions that were taken to correct deficient gas release models used in these safety analyses are described. A correction function, which was developed by the Nuclear Regulatory Commission staff and its consultants, is presented. Related information, including some previously unpublished data, is also summarized. The article thus provides guidance for the analysis of high-burnup gas release in licensing situations.