A liquid-metal reactor for burning minor actinides of spent light water reactor fuel - II: Nuclear data uncertainty analysis

A comprehensive sensitivity and uncertainty analysis was performed on a 120 0-MW (thermal) minor actinide burner designed for a low burnup reactivity s wing, negative Doppler constant, and low sodium void worth. Sensitivities o f the performance parameters were generated using depletion perturbation me thods for the constrained closed fuel cycle of the reactor. The uncertainty analysis was performed using the sensitivity and covariance data taken fro m ENDF/B-V and other published sources. The uncertainty analysis of a liqui d-metal reactor for burning minor actinides has shown that uncertainties in the nuclear data of several key minor actinide isotopes can introduce larg e uncertainties in the predicted performance of the core. The relative unce rtainties in the burnup swing, Doppler constant, and void worth were conser vatively estimated to be 220, 120 and 59%, respectively. An analysis was pe rformed to prioritize the minor actinide reactions for reducing the uncerta inties.