This document describes the development of a 2D RZ VENTURE model for neutronic analysis of the Nigeria Research Reactor-1 (NIRR-1). Key regions of the reactor core were homogenized in the model. Neutronic calculations using the model generated parameters like excess reactivity, control rod worth, and shutdown margin that agreed well with experimental results and other calculations. The model provides an excellent simulation of NIRR-1 and will be useful for future analysis and developing a model to convert NIRR-1 from HEU to LEU fuel.