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Article | REF: SE4058 V3

Probability of failure of the safety function

Author: Olivier IDDIR

Publication date: September 10, 2024

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6. Method for assessing the probability of failure of a RIS

6.1 LEGO approach

The simplified analytical formulas are all based on a "LEGO" approach, which consists of estimating the PFDavg of the RIS by assembling (i.e. summing) the PFDavg averages for each block.

As previously explained and shown in figure 18 , a RIS generally comprises three subsystems.

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Method for assessing the probability of failure of a RIS
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