United States Nuclear Regulatory Commission - Protecting People and the Environment

Assessment of RELAP5/MOD2, Cycle 36.04 Against FIX-II Guillotine Break Experiment No. 5061 (NUREG/IA-0016)

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Publication Information

Date Published: July 1989

Prepared by:
J. 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 FIX-II guillotine break experiment No. 5061 has been analyzed using the RELAP5/Mod2 code. The code version used, Cycle 36.04, is a frozen version of the code.

Four different calculations were carried out to study the sensitivity of initial coolant mass, junction options and break discharge line .nodalization. The differences between the calculations and the experiment have been quantified over intervals in real time for a number of variables available from the measurements during the experiment.

The break mass flows were generally underpredicted at the same time as the depressurization rate was overpredicted.

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