Modifications and applications of the mechanistic gaseous swelling model for UMo fuel

Modifications are introduced to the mechanistic gaseous swelling model for UMo fuel. Analytical expressions are formulated to lower the computation cost. Parametric studies have been carried out to reveal the influence of intergranular resolution rate, hydrostatic pressure, and grain-boundary diffusion enhancement factor. The modified mechanistic swelling model is incorporated to perform the finite element (FE) simulation. This mechanistic model demonstrates comparably high efficiency toward the empirical swelling model. The simulated results by the mechanistic swelling model yield good agreement with the measured data.