LEPRICON (Least-Squares Electric Power Research Institute Consolidation) Code System: Consolidation of Transport Analytical and Unfolding Procedures in LWR (Light Water Reactor) Pressure Vessel Dosimetry

摘要

The LEPRICON (for Least-Square Electric Power Research Institute Consolidation program) code system has been developed over the past ten years to provide a complete analysis of Light Water Reactor (LWR) pressure vessel dosimetry. The system incorporated nine modules. All but one of the modules treat various aspects of neutron transport from the core through the reactor internals to dosimetry locations in the downcomer and/or reactor cavity regions and to critical fluence locations in the pressure vessel. The LEPRICON adjustment module, on the other hand, performs a state-of-the-art least-squares analysis of the results from the transport modules, a procedure often referred as spectral unfolding or the combining of integral and differential data. In terms of development, the adjustment module alone required about 70 percent of the total effort, for reasons that soon will become apparent. The results from the LEPRICON system thus represent prior and adjusted fluences in each of 38 groups from 0.1 to 20 MeV, along with their corresponding standard deviations, at critical locations on the pressure vessel. 7 refs., 1 fig. (ERA citation 13:053600)