Dart model for irradiation-induced swelling of uranium silicide dispersionfuel elements

Models for the interaction of-uranium silicide dispersion fuels with an alu minum matrix for the resultant reaction product swelling, and for the calcu lation of the stress gradient within the fuel particles are described withi n the context of DART fission-gas-induced swelling models. The effects of a n aluminide shell on fuel particle swelling are evaluated. Validation of th e model is demonstrated by comparing DART calculations with irradiation dat a for the swelling of U3SiAl-Al and U3Si2-Al in variously designed dispersi on fuel elements.