United States Nuclear Regulatory Commission - Protecting People and the Environment

Preliminary Assessment of PWR Steam Generator Modelling in RELAP5/MOD3 (NUREG/IA-0113)

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Publication Information

Date Published: July 1993

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

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

A preliminary assessment of Steam Generator (SG) modelling in the PWR thermal-hydraulic code RELAP5/MOD3 is presented. The study is based on calculations against a series of steady-state commissioning tests carried out on the Wolf Creek PWR over a range of load conditions. Data from the tests are used to assess the modelling of primary to secondary side heat transfer and, in particular, to examine the effect of reverting to the standard form of the Chen heat transfer correlation in place of the modified form applied in RELAP5/MOD2. Comparisons between the two versions of the code are also used to show how the new interphase drag model in RELAP5/MOD3 affects the calculation of SG liquid inventory and the void fraction profile in the riser.

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