United States Nuclear Regulatory Commission - Protecting People and the Environment

Assessment of RELAP5/MOD2, Cycle 36.04 Against LOFT Small Break Experiment L3-6 (NUREG/IA-0033)

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Publication Information

Date Published: July 1990

Prepared by:
John Eriksson

Swedish Nuclear Power Inspectorate
S-102 52 Stockholm, Sweden

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

Published by:
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555

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Abstract

The LOFT small break experiment L3-6 has been analyzed as part of Sweden's contribution to the International Thermal-Hydraulic Code Assessment and Applications Program (ICAP).

Three calculations, of which two were sensitivity studies, were carried out. The following quantities were varied:

  • the content of secondary side fluid and the feed water valve closure

  • the two-phase characteristics of the main pumps

All three predictions agreed reasonably well with most of the measured data. The sensitivity calculations resulted only in marginal improvements. The predicted and measured data are compared on plots and their differences are quantified over intervals in real time.

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