IJS Animation Model for Krško NPP (NUREG/IA-0227)

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Publication Information

Manuscript Completed: October 2009
Date Published: May 2010

Prepared by:
Andrej Prošek, Borut Mavko

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

A. Calvo, NRC Project Manager

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

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This report presents the developed animation model for Krško nuclear power plant (NPP). For animations the Symbolic Nuclear Analysis Package (SNAP) was used. Krško NPP, which is a two-loop pressurized water reactor, Westinghouse type, before modernization in 2000 obtained plant specific full scope simulator. In the present study reference design basis calculations for Krško full scope simulator validation were analyzed with the latest RELAP5/MOD3.3 Patch 03 code to get the source data needed for development of animation model. In total six scenarios were analyzed: two scenarios of the Small Break Loss-of-Coolant Accident (LOCA), two scenarios of the Loss of Main Feedwater (LOFW), scenario of the Anticipated Transient Without Scram (ATWS), and scenario of the Steam Generator Tube Rupture (SGTR). Animation masks were created for the primary and the secondary system, important plant systems, the plant signals and the control systems. The use of SNAP for animation of Krško nuclear power plant analyses showed several benefits, especially better understanding of the calculated physical phenomena and processes. It can also be concluded that the use of such support tools to system codes significantly contributes to better quality of safety analysis.

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