Influence of the Spatial Grid Type on the Result of Calculating the Neutron Fields in the Nuclear Power Plant Shielding

Abstract

Purpose. The paper considers the influence of the spatial grid type on the result of solving the equation of neutron transport in the nuclear power plant (NPP) shielding.Method. Neutron fields have been calculated in a realistic model of a liquid metal cooled fast neutron tank reactor with an integral equipment layout. Structured cubic and unstructured hexahedral grids (PMSNSYS and FRIGATE codes) and unstructured tetrahedral and prismatic grids (RADUGA T code) are used. Limiting values of the group fluxes averaged