Spatial discretization in LWR cell calculations with HELIOS 1.9: influence on kinf and flux distribution

Cell calculations are the fundament for all deterministic static and transient 3D full core calculations. The spatial discretization used for the cell calculations influences the results for these transport solutions significantly. The arising differences in the neutron flux distribution due to different spatial discretization are demonstrated. These differences in the flux distribution cause significant changes in the kinf value. Different optimized schemes for economic cell calculations are developed.