United States Nuclear Regulatory Commission - Protecting People and the Environment

Post-Test Analysis of Hot Leg 2x25% Break at PSB-VVER Facility Using TRACE V5.0 Code (NUREG/IA-0248)

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Publication Information

Date Published: February 2011

Prepared by:
P. Heralecky, M. Blaha

TES Ltd
Prazska 597
674 01 Trebic, Czech Republic

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 Thermal-Hydraulic Code Applications and Maintenance Program (CAMP)

Availability Notice

Abstract

The best estimate thermo-hydraulic computer code TRACE V5.0 has been assessed using Hot Leg 2x25% break experiment at the large-scale test facility PSB VVER. The PSB-VVER facility is a 1:3000 volume scaled model of VVER 1000 NPP located in Electrogorsk, Russia. An extensive TRACE input deck of PSB-VVER facility was developed including all important components of the PSB-VVER facility: reactor, 4 separated loops, pressurizer, break unit, main circulation pumps, steam generators, break section and important parts of secondary circuit. The TRACE (TRAC/RELAP Advanced Computational Engine) is the latest in a series of advanced, best-estimate reactor systems codes developed by the U.S. Nuclear Regulatory Commission in frame of CAMP (Code Application and Maintenance Program). The TRACE code is a component-oriented reactor systems analysis code designed to analyze light water reactor transients up to the point of significant fuel damage. The original validation of the TRACE code was mainly based on experiments performed on experimental facilities of typical PWR design. There are some different features of VVER design comparing to PWR. Therefore the validation of the thermo-hydraulic codes for VVER types of reactors is required by regulators. The purpose of performed analysis is to extend the validation of the TRACE code focused on VVER type of NPP′s. This work was performed in the frame of R&D project sponsored by The Ministry of Industry and Trade of Czech Republic.

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