The LEPRICON code system: Consolidation of transport analytical and unfolding procedures in LWR pressure vessel dosimetry

Conference · Fri Jan 01 04:00:00 EST 1988 · Transactions of the American Nuclear Society; (USA)

OSTI ID:5434202

Maerker, R E ^[1]

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1. Oak Ridge National Lab., TN (USA)

The LEPRICON (for {und L}east-Squares {und E}lectric {und P}ower {und R}esearch {und I}nstitute {und Con}solidation program) code system has been developed over the past 10 yr to provide a complete analysis of light water reactor (LWR) pressure vessel dosimetry. The system incorporates 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 to as spectral unfolding or the combining of integral and differential data. In terms of development, the adjustment module alone required {approximately}70% 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 in the pressure vessel. The complete LEPRICON methodology provides a comprehensive and accurate analysis of LWR dosimetry and, as a result, has been recommended as serving the needs of the US Nuclear Regulatory Commission for extended pressure vessel lifetime monitoring.

• OSTI ID: 5434202
• Report Number(s): CONF-881011--
• Conference Information: Journal Name: Transactions of the American Nuclear Society; (USA) Journal Volume: 57
• Country of Publication: United States
• Language: English

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