United States Nuclear Regulatory Commission - Protecting People and the Environment

Assessment of the TRAC-M Codes Using Flecht-Seaset Reflood and Steam Cooling Data (NUREG-1744)

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Publication Information

Manuscript Completed: May 2001
Date Published: May 2001

Prepared by:
F. Odar

Division of Systems Analysis and Regulatory Effectiveness
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

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Abstract

This report presents the results of an assessment of the capabilities of the TRAC-M(F77), Version 5.5.2.A, and TRAC-M(F90), Version 3.580, codes to predict reflood and steam cooling phenomena that may occur during a postulated large-break loss-of-coolant accident (LOCA). The assessment is predicated on test data from Flecht-Seaset Runs 31504 and 32753. The assessment shows that predictions of the reflood phenomena derived using both codes are inaccurate; however, it is judged that they can conservatively predict peak clad temperatures in heated rods since the code model expels more water from the test section than measured. The predictions of steam cooling in single-phase flow conditions are acceptable.

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