Abstract
The assessment of cladding degradation mechanisms under anticipated DBA LOCA conditions requires analytical tools capable of properly modelling the processes involved in clad deformation and burst. The present work proves that the deviations found in FRAPTRAN simulations of burst and LOCA tests, mostly concerning time to failure, come to a good extent from the high temperature creep law, whereas failure limits barely play any role in the deviations. According to an analysis conducted with an alternative model, one might conclude that a Norton-type formulation, once extended to irradiated conditions, might substantially enhance FRAPTRAN accuracy. Besides, this work shows how the formulation adopted to estimate plastic strains up to the instability strain also plays an important role in the time-to-failure prediction.
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