ROD-BY-ROD DETAILED MONTE CARLO METHOD OF COFRENTES NPP AS A COMERCIAL CORE CRITICAL

摘要

The detailed rod-by-rod three dimensional modeling of large cores such as the commercial reactors is now possible. The simultaneous improvement in fuel depletion systems based on Monte Carlo codes allows using the criticality of first and reload cores as critical experiments, usually defined as commercial core criticals (CCC). The interest of such critical configurations for reload cores is evident for the validation of codes and cross-sections used for burn-up credit. Nevertheless other areas of the fuel management can benefit from this capabilities since the realistic rod-by-rod detailed modelling of fuel assemblies can provide valuable help in the optimization of reload patterns and in the licensing of other production-oriented calculation tools In this presentation the results obtained in reactivity and power distribution in the analysis of Cofrentes NPP first criticality and of a low-burnup xenon-equilibrium state-point and its comparison with in-core instrumentation measurements are presented. The plan for development of a local rod-by-rod Monte Carlo fuel depletion capability is presented as well.