RELAP5 assessment: semiscale Mod-3 small-break tests. [PWR]

Technical Report · Fri Jul 01 04:00:00 EDT 1983

OSTI ID:5620951

Summers, R M

The RELAP5 independent assessment project at Sandia National Laboratories is part of an overall effort funded by the NRC to determine the ability of various systems codes to predict the detailed thermal-hydraulic response of LWR's during accident and off-normal conditions. The RELAP5/MOD1 code is being assessed at SNLA against test data from various integral and separate effects test facilities. As part of this assessment matrix, a series of small break experiments performed at the Semiscale Mod-3 facility have been analyzed. The results show that RELAP5/MOD1 will predict reasonably well many aspects of the four small break transients analyzed. Many problems were encountered in matching the initial primary and secondary steady state conditions, which in turn affected the transient calculations. Although the calculations predicted the relative severity of the experiments in terms of mass inventories and distribution, quantitatively they generally predicted a more severe transient than was observed experimentally.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5620951
• Report Number(s): NUREG/CR-3277; SAND-83-1038; ON: DE84000175
• Country of Publication: United States
• Language: English

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