SIEMENS' INTEGRATED CODE SYSTEM CASCADE-3D FOR CORE DESIGN AND SAFETY ANALYSIS

摘要

This work presents the development, verification and application of the new program systemrnCASCADE-3D which links Siemens' advanced code packages for in-core fuel management,rncore monitoring, and accident analysis. Direct coupling of these large code systems reducesrnthe effort required to transfer information as well as eliminates the chance for errors to occur.rnThe in-core fuel management code uses state-of-the-art technology including discontinuityrnfactors, nodal expansion and pin power reconstruction. The core monitoring system utilizesrnthe same core physics code and reports monitored data based upon the reactor measurements.rnThe 3D transient code uses the same core physics models as the fuel management systemrnincorporating the same highly optimized flux solver. Each of these systems has beenrnextensively benchmarked against plant operating data as well as experimental results. Somernof these comparisons are presented here as representative examples. By using the capabilitiesrnof CASCADE-3D the potential of modern fuel assemblies and in-core fuel managementrnstrategies can be much better utilized because safety limits which had been reduced due tornconservative methods are now predicted more accurately. Due to the enhanced integration ofrnthe code packages used in core design and safety analysis a new extended code system isrnavailable for consistent analyses of the reactor core and the entire nuclear power plant.