Abstract
The intensification of strain in the cladding, caused by the expansion of cracked fuel pellets, was studied using the theory of plate bending. A simplified equation for evaluation of local strain in the cladding was derived which considers the effect of non-axisymmetric deformation in the cladding and the gap between fuel and cladding. Comparison was made with other theoretical analysis, based on the stress function and Fourier series technique. Circumferential strain distribution was also measured with wire strain guages plated on the Zircaloy-2 cladding, which was expanded by use of pre-cracked hollow pellets. Strain distribution data obtained from the proposed equation were found to agree with the experimental results.
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