The HEXAB-3D Three-Dimensional Few-Group Improved Coarse-Mesh Diffusion Code for Hexagonal-z Geometry

Abstract

HEXAB-3D is a three-dimensional few-group improved coarse-mesh diffusion code for hexagonal-z geometry useful for steady-state neutronics core analysis. The HEXAB-3D computer code determines the effective multiplication factor, the group neutron flux and power distributions, the peaking factors, the control rod worth, etc., in a nuclear power reactor with a hexagonal core configuration and a heterogeneous structure in the axial direction. There are two options for the diffusion equation solution in the horizontal plane: a 30-deg sector of the reactor core (with reflective conditions on the internal reactor boundaries) or the full core.