Pisarev A.N., Kolesov V.V., Kotov Ya.A., Nevinitsa V.A., Fomichenko P.A.
National Research Center “Kurchatov Institute”, Moscow, Russia
The paper considers the possibility of transferring nuclear data uncertainties obtained by processing the evaluated nuclear data files using the NJOY software package to the nuclear concentrations of the WWER-SKD assembly. One-group constant errors were calculated by the ERROR module using 32 and 33 files of the JEFF-3.3 evaluated nuclear data library. Burnout calculations were carried out using the VisualBurnOut program, which works in conjunction with the MCNP program. The dependence of the uncertainties of nuclear concentrations of a number of actinides on the burn-up time is obtained. As the fuel burns up, the behavior of the root-mean-square deviations of nuclear concentrations of nuclides, due to uncertainties in neutron cross sections, is not always monotonous and depends on many factors. For the main isotopes of uranium, the concentration uncertainties do not exceed 2 %, for the isotopes of plutonium, no more than 3.5 %, while for the main actinides, the values are in the region of 10 %. For heavier actinides, the uncertainty values turn out to be even larger. The results indicate the need to intensify work to improve nuclear data. Using the proposed technique, it is possible to identify those neutron cross sections that, from the point of view of uncertainties, most affect the uncertainties in nuclear concentrations.
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