RELAP5/MOD3.3 RELEASE Pre & Postprocessor (NUREG/IA-0433)

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Publication Information

Manuscript Completed: April 2013
Date Published: December 2013

Prepared by:
Dr. W. Tietsch

Westinghouse Electric Germany GmbH
Dudenstrasse 44
68167 Mannheim

K. Tien, NRC Project Manager

Division of Systems Analysis
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)

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

Availability Notice


Since the introduction of the 32-Bit Windows Operating System technology for Personal Computers with INTEL CPU architecture Relap has been migrated from mainframe computers and UNIX workstations to the desktop personal computers. Due to the general structure of Relap the user interface however did not change in the course of this migration. Relap running on PCs still is command line driven and does not take advantage of the benefits of the windows environments. Inputs to the program and outputs have the same structure as the UNIX or mainframe versions. Therefore the classic way of performing analyses with Relap which consist of several, mostly iterative and consecutive steps did not change with PC installations of the program.

Westinghouse Reaktor mid of the 90th developed several tools running on the PC to support the analysts retrieving and documenting results of Relap analyses. Based on these tools and using the power of the object oriented technology and third party functionality for the graphics generation a Graphical Users Interface has been developed by Westinghouse Reaktor which integrates all steps of a typical Relap analysis process. This Pre & Postprocessor has been designed to run in all known Windows environments (Windows95/98, ME, NT4, 2000 and XP). It has the feel and look of typical Windows software and an intuitive users interface which only requires a minimum of training. The actual version 3.3.0 of the Pre & Postprocessor cooperates with the Intel Relap5Mod3.3Release version

The present report describes the general features of the Pre & Postprocessor, the installation, the typical analysis process including restarts and strip cases and the data retrieval and visualization process. Additionally the Restart Postprocessor, which is a FORTRAN program with command line control, which is used by the Pre & Postprocessor running in the background is described and a source code listing of this program is added.

The Pre & Postprocessor currently is used at Westinghouse Reaktor GmbH as a standard tool and has proven to support the Relap analysis process and to enhance the efficiency of the analysts.

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