United States Nuclear Regulatory Commission - Protecting People and the Environment

Assessment of PWR Steam Generator Modelling in RELAP5/MOD2 (NUREG/IA-0106, TEC/L/0471/R91)

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Publication Information

Date Published: June 1993

Prepared by:
J. M. Putney, R. J. Preece

National Power
Technology and Environmental Centre
Kelvin Avenue
Leatherhead
Surrey, KT22 7SE
United Kingdom

Prepared as part of:
The Agreement on Research Participation and Technical Exchange
under the International Thermal-Hydraulic Code Assessment
and Application Program (ICAP)

Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

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Summary

An assessment of Steam Generator (SG) modelling in the PWR thermal-hydraulic code RELAP5/MOD2 is presented. The assessment is based on a review of code assessment calculations performed in the UK and elsewhere, detailed calculations against a series of commissioning tests carried out on the Wolf Creek PWR and analytical investigations of the phenomena involved in normal and abnormal SG operation. A number of modelling deficiencies are identified and their implications for PWR safety analysis are discussed - including methods for compensating for the deficiencies through changes to the input deck. Consideration is also given as to whether the deficiencies will still be present in the successor code RELAP5/MOD3.

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