Abstract
The MFPR/R code designed for mechanistic modelling of irradiated UO2 fuel, was further developed for characterization of the rim zone and high burnup structure (HBS) evolution in UO2 fuel pellets. The application of the MFPR/R semi-empirical criterion for fuel restructuring, related to the dislocation density threshold, allows calculating the penetration depth of HBS as a function of burnup, in a reasonable agreement with observations. For modelling of the porosity evolution in HBS at the UO2 fuel pellet periphery, the MFPR/R model for coalescence of randomly distributed immobile pores owing to their growth and impingement was further developed and validated. The advanced model considering multiple collisions provides a reasonable consent with experimental data, thus demonstrating the validity of the proposed pore coarsening mechanism in HBS.
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