Evaluation of the Effect of Linear Scattering Anisotropy and Boundary Shape on the Calculation of K∞ for VVER-1000 Cells with Mixed Uranium-Plutonium Power-Grade Fuel

Abstract

The method of surface pseudo sources for solving the multigroup neutron transport equation with scattering anisotropy and different boundary conditions by the operator splitting method was developed previously. The method was implemented in the RATsIYa option of the WIMS-SH-2.0 complex. The impact of scattering anisotropy and the form of the boundary conditions on K_∞ of VVER-1000 reactor cells with uranium-plutonium power-grade fuel was investigated. The calculations showed that the impact of each of these two effects is about 0.5%; they have different signs, as a result of which they largely compensate one another.