Physics support analyses for full central-zone flux flattening for full-power (3000- to 4000-MW) operation

New neutronics analyses have been completed to provide the bases for new neutronics and thermal hydraulics related operating limits and limits correction factors. These new analyses incorporate the effects of flux and power profile changes in the N Reactor from the introduction of the Flux Flattening Program fuel charge designs and loading patterns. While the thermal hydraulics analyses are being documented separately (References 1 and 2), all neutronics calculations and a description of the methodologies for neutronics operating limits determination are included in this document. Both unflattened and full central zone flattened cases were evaluated with new and upgraded codes and methods. Most of the neutronics and thermal hydraulics operating limits changes are very small or insignificant when comparing the flux flattened core design to the unflattened core design. The largest changes between the new and the previous limits are all due to the use of improved computer codes and analysis which allow better simulation of operating conditions. 53 refs., 33 figs., 14 tabs.