Conformal mapped nodal simplified P 3 equations are derived and implemented for the two-dimensional neutronics analysis of fast reactor cores where hexagonal assemblies are loaded. The one-dimensional simplified P 3 equations are solved by using the nodal expansion method. The partial currents response matrices are constructed for the coupled simplified P 3 equations by applying the relationship between the partial currents and the surface-averaged fluxes. These matrices are then solved non-linearly.This method has been demonstrated for three two-dimensional fast reactor problems, and it was observed that the conformal mapped nodal simplified P 3 method can be effectively applied for the neutronics analysis of fast reactors with a substantial improvement in computational accuracy over the diffusion method.