Cell calculations of the reactor Maria by the S-Wims code

A set of group material data for global diffusion calculations of the MARIA research reactor at zero power is obtained. The data are given by the S-WIMS code for 2 and 5 neutron energy groups respectively. The heterogeneities in the core, such as channels filled with water or absorbing boral rods were taken into account. The results of cell calculations were related to the experiment by means of overall reactor calculations for known, from the critical experiments, material configurations of the core. An influence of various assumptions concerning physical and geometrical cell models on the group constants is discussed. Optimal calculational models for the reactor cells were chosen. (author)