Assessment of the Reactivity Bias and Bias Uncertainty Due to WWEr‐440 Fuel Depletion Uncertainties
26th Symposium of AER on VVER Reactor Physics and Reactor Safety (2016, Helsinki, Finland)
Intermediate storage of spent fuel decommissioning and radwaste / Spent fuel disposal and actinide transmutation
Abstract
ASSESSMENT OF THE REACTIVITY BIAS AND BIAS UNCERTAINTY DUE TO WWER-440 FUEL DEPLETION UNCERTAINTIESN. Baghdasaryan, S. Bznuni, A. AmirjanyanNuclear and Radiation Safety Center,P. KohutBrookhaven National LaboratoryJ. RamsayUSA Nuclear Regulatory CommissionABSTRACTIn this paper, bias and bias uncertainty in the neutron multiplication factor due to biases and bias uncertainties in the calculated nuclide concentrations in the spent nuclear fuel of WWER- 440 type was assessed. To determine isotopic biases and bias uncertainties in the calculated nuclide concentrations, they were compared to the results of the measurements of isotopic compositions from destructive radiochemical assay of WWER-440 spent fuel carried out in the RIAR (Dimitrovgrad). By employing Monte Carlo uncertainty sampling method, the isotopic biases and bias uncertainties were applied to the spent fuel compositions of ANPP spent fuel transport cask model to determine bias and bias uncertainty values in keff.The MCNP 6.1 code and the ENDF/B-VII.1 nuclear data were used to assess keff bias and bias uncertainty results for ANPP spent fuel transport cask model.26th Symposium of AER on VVER Reactor Physics and Reactor Safety 54 10 – 14 October 2016, Helsinki, Finland