IJS Procedure for Converting Input Deck from RELAP5 to TRACE (NUREG/IA-0408)

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Publication Information

Manuscript Completed: October 2012
Date Published: October 2012

Prepared by:
A. Prošek, O.A. Berar, B. Mavko

Jožef Stefan Institute
Jamova cesta 39
SI-1000 Ljubljana, Slovenia

A. Calvo, NRC Project Manager

Prepared as part of:
The Agreement on Research Participation and Technical Exchange
Under the Thermal-Hydraulic Code Applications and Maintenance Program (CAMP)

Published by:
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

Availability Notice


Much of efforts have been done in the past to develop the RELAP5 input decks. The purpose of this study is to present the RELAP5 to TRACE conversion procedure, developed at Institut “Jožef Stefan” (IJS). For demonstrating the conversion procedure the ACHILLES and BETHSY input decks (IJS legacy) were used using SNAP. The RELAP5 input decks of ACHILLES rig and BETHSY facility were developed in the frame of participation to international standard problem no. 25 (ISP-25) and international standard problem no. 27 (ISP-27). These RELAP5 legacy input decks were used for demonstration of the developed IJS conversion methodology, consisting of eleven steps. Besides demonstration of the methodology also the comparison between RELAP5 and TRACE has been done. It can be concluded that calculated results obtained by TRACE are as good as the results by RELAP5, thus suggesting that IJS conversion procedure may be used for conversion of separate and integral effect test legacy RELAP5 input decks to TRACE input decks.

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