Abstract
The pellet cracking and relocation recovery is an important physical phenomenon for LWR fuel and also is an indispensable model for the fuel performance analysis code. During rise to power, there exists a large temperature gradient within the pellet from the centerline to the cooler periphery and it is enough to induce cracking to release the thermal stress. Simultaneously, the pellet diameter increases rapidly. Once the fuel rod gap is closed, the cladding constraint produced by pellet-cladding interaction plays an important role in the process of relocation recovery. In this paper, a new relocation recovery model as a function of power, contact pressure and time is established. The new model has been successfully implemented in the fuel rod performance analysis code JASMINE. Based on comparisons between code predictions and experimental measurements, the results indicate that the newly developed relocation recovery model has an excellent predictive ability.
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