MONTE-CARLO VERSUS DISCRETE ORDINATES CALCULATIONS OF THE KINETIC ANDCOUPLING PARAMETERS OF A PWR CORE WITH A MULTI-NODE REFLECTOR

A set of coupled kinetic equations is derived for the core and a multi -node reflector from the neutron transport and adjoint equations. The kinetic and coupling parameters joining this set are calculated using the scalar and angular fluxes and adjoints obtained by the Monte Carlo and the discrete ordinate (SN) methods. Based on the results obtained from the two methods, the gain and phase of the zero power transfer f unction are plotted for several reflector nodes. It is found that both methods agree when the core and the reflector are united in one node. Differences are noticed at the high frequency range when several node s are considered.