Solution of heterogenity problems in cylindrical nuclear reactor core containing assymetric array of cylindrical control rods, using factitious parameters of black bodies

This paper describes how the fictitious parameters of black bodies can be used to apply the continuity of thermal fluxes and currents at the surface of control rod. This leads to an easier method for describing the criticality condition of cylindrical core containing array of cylindrical control rods differ in material, location and size. Some special configurations for rods through bare or reflected core are tested to calculate the critical core radius, rod worth and flux distribution. Parameters of the ET-RR-1 reactor core are taken as a data for calculations, the rods are taken to be of boron carbide. A complete computer code is written on Fortran 4 language to calculate the above items