United States Nuclear Regulatory Commission - Protecting People and the Environment

TRAC-PF1/MOD1 Post-Test Calculations of the OECD [Organisation for Economic Co-operation and Development] LOFT Experiment LP-SB-2 (NUREG/IA-0019)

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Publication Information

Date Published: December 1990

Prepared by:
F. Pelayo

United Kingdom Atomic Energy Authority
Winfrith, Dorchester
Dorset, England

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

An analysis of the OECD-LOFT-LP-SB-2 experiment making use of TRAC-PFl/MOD1 is described in the report.

LP-SB2 experiment studies the effect of a delayed pump trip in a small break LOCA scenario with a 3 inches equivalent diameter break in the hot leg of a commercial PWR operating at full power.

The experiment was performed on 14 July 1983 in the LOFT facility at the Idaho National Engineering Laboratory under the auspices of the Organisation for Economic Co-operation and Development (OECD). This analysis presents an evaluation of the code capability in reproducing the complex phenomena which determined the LP-SB-2 transient evolution. The analysis comprises the results obtained from two different runs. The first run is described in detail analysing the main variables over two time spans: short and longer term. Several conclusions are drawn and then a second run testing some of these conclusions is shown.

All of the calculations were performed at the United Kingdom Atomic Energy Establishment at Winfrith under the auspices of an agreement between the UKAEA (United Kingdom Atomic Energy Authority) and the Consejo de Seguridad Nuclear Espafol (CSN).

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