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          NRC Library  Document Collections  NUREG-Series Publications  Publications Resulting from International AgreementsRELAP5 Simulation of Darlington Nuclear Generating Station Loss of Flow Event (NUREG/IA-0247)

On this page: Publication Information AbstractDownload complete document NUREG/IA-0247 (PDF - 1.73 MB)Publication Information **Date Published:**February 2011 **Prepared by:** D. Naundorf1 J. Yin1 A. Petruzzi2 A. Kovtonyuk2 1AMEC NSS Limited 700 University Avenue Toronto, Ontario, Canada 2Nuclear Research Group San Piero A Grado University of Pisa Pisa, Italy A. Calvo, NRC Project Manager **Published by:** Office of Nuclear Regulatory Research U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 **Prepared as part of**: The Agreement on Research Participation and Technical Exchange Under the International Code Assessment and Maintenance Program (CAMP) Availability Notice Abstract The Darlington NGS consists of four 940 MWe CANDU reactors. A detailed RELAP5 model of a Darlington NGS reactor has been created for use with RELAP5/MOD3.3. The model includes the primary heat transport system, the steam generator feedwater and main steam supply systems, the pressure and inventory control system, and the emergency coolant injection system. The modeling of Darlington required the creation of new subroutines for RELAP5 to describe the functionality of the process control systems and emergency control systems with sufficient accuracy. These controller subroutines are standalone modules that are compiled and linked together with the RELAP5 source to facilitate integration with future revisions to the code. The November 25, 1993, loss-of-flow event at Darlington was simulated using this RELAP5 model. Excellent agreement was obtained between the RELAP5 predictions and station measurements. 
      
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