This study is an investigation on neutronics parameters for Nigeria Research Reactor-1 (NIRR-1) core, a low power Miniature Neutron Source Reactors (MNSRs) using VENTURE-PC and SCALE 6.1 codes in the 19.75% enriched uranium dioxide (UO2)-Zircaloy-4 material. The number of active fuel pins used for this analysis is approximate 200...