Taking uncertainties into account
Fault tree - Temporal aspects

Article REF: SE4053 V1

Taking uncertainties into account
Fault tree - Temporal aspects

Author : Jean-Pierre SIGNORET

Publication date: December 10, 2017 | Lire en français

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2. Taking uncertainties into account

The data used for probabilistic calculations comes from the statistical processing of feedback from operating plants. Thus, from k observed failures over a cumulative observation time, T the failure rate can be estimated at $\hat{λ} = \frac{k}{T}$ . The accuracy of this estimate increases as k and T increase. It is generally estimated from the 90% confidence interval, $[\frac{1}{2 T} χ_{95 %,2 k}^{2}, \frac{1}{2 T} χ_{5 %,2 (k + 1)}^{2}]$ ...

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Bibliography

(1) - GONDRAN (M.), PAGES (A.) - Fiabilité des systèmes. - Collection de la direction des études et recherches d'électricité de France, Eyrolle (1980).
(2) - ERICSON (C.) - Fault Tree Analysis – A history - Proceedings of the 17th International...

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