The formulation of empirical swelling and irradiation creep equations from their respective independent data bases is reviewed. These equations are not inclusive of all reactor operating conditions, and the use and applicability of these equations is discussed. The application of swelling and irradiation creep equations in the design of core components is illustrated for both primary and secondary loading situations. The primary (external) loading illustrations include fuel pin performance and duct dilation. The agreement between measurements and predictions using swelling and irradiation creep equations indicates that these equations adequately describe available component performance data. Secondary (internal) loading is illustrated by duct bowing. The necessary component performance and model test data to determine the applicability of swelling and irradiation creep equations are currently in-progress in EBR-II or planned for early FFTF tests.

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