Assessment of RELAP5/MOD 2, Cycle 36, Against FIX-Il Split Break Experiment No. 3027 (NUREG/IA-0005)

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Publication Information

Date Published: September 1986

Prepared by:
J. Eriksson

Swedish Nuclear Power Inspectorate
P.O. Box 27106
S102 #52 Stockholm, Sweden

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

Availability Notice


The FIX-II split break experiment No. 3027 has been analyzed using the RELAP5/Mod2 code. The code version used, Cycle 36, is a frozen version of the code.

Four different prediction calculations were carried out to study the sensitivity on various parameters to changes of break discharge, initial coolant mass, and passive heat structures. 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 core inventory expressed by the differential pressure over the core was generally underpredicted. Dryout times were generally overpredicted, probably due to differences in the used dryout correlation.

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