A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Treatment of Common Cause Failures. The Nordic Perspective
Abstract This paper presents current developments in Nordic countries within the area of treatment of Common Cause Failures (CCFs). The organisation and main findings of the recently performed Nordic Benchmark Exercise on CCF-data are described. The findings concern recommendations on suitable procedures for search of CCFs, suggestions for improvements of the current failure reporting system, merits and drawbacks of classification systems, most sensitive elements in the process of CCF-quantification, and evaluation of parametric models and use of direct assessment in the context of CCF-quantification. In the second part of this report the results from the first, qualitative phase of a project aiming at a systematic comparison of the treatment of dependencies (and CCFs in particular) in the Swedish Probabilistic Safety Assessments (PSAs), are summarized. A wide spectrum of differences has been observed between the analyses performed. These differences may concern level of ambition, degree of detail, scope, approach to modelling and quantification, and documentation of the studies. Generally, the Swedish PSAs have been successful in identification of various types of dependencies. The recommendations based on the qualitative analysis comprise a list of specific cases to be analysed in the planned sensitivity studies, proposals for future Nordic research projects and suggestions for improvements of/supplements to existing analyses.
Treatment of Common Cause Failures. The Nordic Perspective
Abstract This paper presents current developments in Nordic countries within the area of treatment of Common Cause Failures (CCFs). The organisation and main findings of the recently performed Nordic Benchmark Exercise on CCF-data are described. The findings concern recommendations on suitable procedures for search of CCFs, suggestions for improvements of the current failure reporting system, merits and drawbacks of classification systems, most sensitive elements in the process of CCF-quantification, and evaluation of parametric models and use of direct assessment in the context of CCF-quantification. In the second part of this report the results from the first, qualitative phase of a project aiming at a systematic comparison of the treatment of dependencies (and CCFs in particular) in the Swedish Probabilistic Safety Assessments (PSAs), are summarized. A wide spectrum of differences has been observed between the analyses performed. These differences may concern level of ambition, degree of detail, scope, approach to modelling and quantification, and documentation of the studies. Generally, the Swedish PSAs have been successful in identification of various types of dependencies. The recommendations based on the qualitative analysis comprise a list of specific cases to be analysed in the planned sensitivity studies, proposals for future Nordic research projects and suggestions for improvements of/supplements to existing analyses.
Treatment of Common Cause Failures. The Nordic Perspective
Hirschberg, S. (author)
1989-01-01
21 pages
Article/Chapter (Book)
Electronic Resource
English
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