Effect of different reflector materials on core neutronics of LEU cores of MTR type research reactor

Effect of different reflector materials like light water, heavy water, graphite, beryllium, and beryllium oxides on core excess reactivity and multigroup neutron fluxes have been studied using standard computer codes WIMS-D and EXTERMINATOR-II. Three energy groups, X-Y calculations have reflected on two opposite faces by single row/double row of the reflector material followed by light water The core reflected by single row of light water, heavy water, graphite, beryllium and beryllium oxide has a percentage excess reactivity of 7.38, 10.03, 9.82, 11.93 and 11.67, respectively. Total excess reactivity of the core becomes 7.38, 10.63, 12.86 and 12.54 percentage respectively, when the second row of the reflector material is introduced. (author)