Les Probabilit\'es D\'efaillance comme Indicateurs de Performance des Barri\`eres Techniques de S\'ecurit\'e - Approche Analytique

TL;DR

This paper introduces an analytical approach to evaluate failure probabilities as key indicators of safety barrier performance, aiding risk assessment in industrial safety under French environmental regulations.

Contribution

It proposes generic formulas for calculating failure probabilities considering barrier architecture and testing, enhancing safety performance evaluation methods.

Findings

Failure probabilities effectively indicate safety barrier performance.

Formulas incorporate failure rate, architecture, and testing procedures.

Results facilitate direct assessment of safety confidence levels.

Abstract

French environmental laws require industrialists to include probability criteria in risk assessments, especially to define confidence levels for risk management measures. This paper presents the failure probabilities as efficient indicators for technical safety barrier performances. Generic formulas are proposed to evaluate these probabilities, including failure rate, barrier architecture, full and partial proof tests. In many cases, these results can be directly used to assess safety barrier confidence levels.