Calculating importance measures in PSA at different levels

Nicolas Duflot (1) , Christophe Bérenguer (2) , Laurence Dieulle (1) , Dominique Vasseur (3)

1 LM2S - Laboratoire Modélisation et Sûreté des Systèmes
2 STMR - Sciences et Technologies pour la Maitrise des Risques
3 EDF R&D MRI - Management des Risques Industriels

In PSA (Probabilistic Safety Analysis) applications, importance measures like Vesely-Fussel factor, RAW or RRW are well known and used to estimate the importance regarding risk (or safety) of an event. These importance measures are usually applied to study the importance of basic events in PSA, i.e. importance of a single component failure mode. However, importance measures can not only be applied to study elementary events, but can also be extended to study more complex events like system failure or function failure. In this paper, we define "extended importance measures" for different kind of events. Then we present their interpretation and their potential applications. Along the paper, an example is developed to illustrate the differences between these measures

Domains: Performance [cs.PF]

Nicolas Duflot, Christophe Bérenguer, Laurence Dieulle, Dominique Vasseur. Calculating importance measures in PSA at different levels. European safety and Reliability Conference - ESREL'06, Sep 2006, Estoril, Portugal. pp.2405-2412. ⟨hal-02593412⟩