Isotopic Bias and Uncertainty for Burnup Credit Applications

[摘要] The application of burnup credit requires calculating the isotopic inventory of the irradiated fuel. The depletion calculation simulates the burnup of the fuel under reactor operating conditions. The result of the depletion analysis is the predicted isotopic composition, which is ultimately input to a criticality analysis to determine the system multiplication factor (k{sub eff}). This paper demonstrates an approach for calculating the isotopic bias and uncertainty in k{sub eff} for commercial spent nuclear fuel burnup credit. This paper covers 74 different radiochemical assayed spent fuel samples from 22 different fuel assemblies that were irradiated in eight different pressurized water reactors (PWRs). The samples evaluated span an enrichment range of 2.556 wt% U-235 through 4.67 wt% U-235, and burnups from 6.92 GWd/MTU through 55.7 GWd/MTU.

[发布日期] 2002-08-19 [发布机构] United States. Department of Energy. Yucca Mountain Project Office.

[关键词] Criticality;Multiplication Factors;Pwr Type Reactors;11 Nuclear Fuel Cycle And Fuel Materials;Nuclear Fuels