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Toward an Application Guide for Safety Integrity Level Allocation in Railway Systems

Author

Listed:
  • Kiswendsida Abel Ouedraogo
  • Julie Beugin
  • El‐Miloudi El‐Koursi
  • Joffrey Clarhaut
  • Dominique Renaux
  • Frederic Lisiecki

Abstract

The work in the article presents the development of an application guide based on feedback and comments stemming from various railway actors on their practices of SIL allocation to railway safety‐related functions. The initial generic methodology for SIL allocation has been updated to be applied to railway rolling stock safety‐related functions in order to solve the SIL concept application issues. Various actors dealing with railway SIL allocation problems are the intended target of the methodology; its principles will be summarized in this article with a focus on modifications and precisions made in order to establish a practical guide for railway safety authorities. The methodology is based on the flowchart formalism used in CSM (common safety method) European regulation. It starts with the use of quantitative safety requirements, particularly tolerable hazard rates (THR). THR apportioning rules are applied. On the one hand, the rules are related to classical logical combinations of safety‐related functions preventing hazard occurrence. On the other hand, to take into account technical conditions (last safety weak link, functional dependencies, technological complexity, etc.), specific rules implicitly used in existing practices are defined for readjusting some THR values. SIL allocation process based on apportioned and validated THR values is finally illustrated through the example of “emergency brake” subsystems. Some specific SIL allocation rules are also defined and illustrated.

Suggested Citation

  • Kiswendsida Abel Ouedraogo & Julie Beugin & El‐Miloudi El‐Koursi & Joffrey Clarhaut & Dominique Renaux & Frederic Lisiecki, 2018. "Toward an Application Guide for Safety Integrity Level Allocation in Railway Systems," Risk Analysis, John Wiley & Sons, vol. 38(8), pages 1634-1655, August.
    • Handle: RePEc:wly:riskan:v:38:y:2018:i:8:p:1634-1655
    DOI: 10.1111/risa.12972
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    References listed on IDEAS

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    5. Dutuit, Y. & Innal, F. & Rauzy, A. & Signoret, J.-P., 2008. "Probabilistic assessments in relationship with safety integrity levels by using Fault Trees," Reliability Engineering and System Safety, Elsevier, vol. 93(12), pages 1867-1876.
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