Nuclear data uncertainties in intermediate neutron spectrum problems and the intermediate neutron spectrum experiment

摘要

During the investigation of various surplus fissile material disposition proposals, uncertainties in the data of SiO2/Pu mixtures were discovered. Additionally, it has been reported that metal/U-235 mixtures also have data uncertainties. We have identified two potential areas from which these uncertainties may arise. The first potential source of uncertainty in the nuclear data is due to fact that the cross-sections of the fissile material have not been tested in an intermediate energy spectrum. The second potential source of uncertainty is that the non-fissile material in the mixture may not have been appropriately tested in a critical experiment.