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Science and Technology of Nuclear InstallationsVolume 2008 2008, Article ID 761897, 5 pages

Research Article

Westinghouse Electric Germany GmbH, Dudenstraße 44, 68167 Mannheim, Germany

EnBW Kernkraft GmbH, Rheinschanzinsel, 76661 Philippsburg, Germany

Received 16 April 2008; Accepted 23 June 2008

Academic Editor: Martina Adorni

Copyright © 2008 Ralf Obenland et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The German regulatory guide demands the performance of a probabilistic risk assessment PRA including external events. In 2005, a new methodology guideline Methodenband based on the current state of science and technology was released to provide the analyst with a set of suitable tools and methodologies for the analysis of all PRA events. In the case of earthquake, a multilevel verification procedure is suggested. The verification procedure which has to be used depends on the seismic risk at the site of the plant. For sites in areas with low seismic activity no analysis or only a reduced analysis is proposed. This paper describes the evaluation of safety margins of buildings, structures, components and systems for plants at sites with high seismic risk, corresponding to the German methodology guideline. The seismic PRA results in an estimation of core damage frequencies caused by earthquakes. Additionally, the described approach can also be adapted for the usage in a reduced analysis for sites with lower earthquake risks. Westinghouse has wide experience in performing seismic PRA for both BWR as well as PWR plants. Westinghouse uses the documented set of seismic design analyses dating from construction phase and from later updates, if done, as a basis for a seismic PRA, which means that usually no costly new structural mechanics calculations have to be performed.

Autor: Ralf Obenland, Theodor Bloem, Wolfgang Tietsch, and Jang-Bahadur Singh



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