CELL GEOMETRY-EFFECTS ON NUCLEAR CHARACTERISTICS IN EQUILIBRIUM STATE

Effects of the cell geometry on core performance are investigated for a liquid sodium cooled MOX fuel fast reactor at the equibrium state. T he fuel pellet diameters and pin pitches are changed for a parametric study with Equilibrium Cell Iterative Calculation System (ECICS). The conventional fixed composition calculations are also performed to comp are with the results of ECICS. The nuclear characteristics such as the neutron spectrum, one-group nuclear constants, nuclide number densiti es and criticality are evaluated. The obtained results clarify the uni que property of the equilibrium state in the cell geometrical change. (C) 1998 Elsevier Science Ltd. All rights reserved.