6. Frequently asked questions
Is it possible to assign a high confidence level (NC) to a human MMR or SAMS?
The NC allocated to a MMR involving human action is generally limited to one level (NC = 2), and this level is generally associated with the upper limit of the probability of failure, i.e. 1E-2. In practice, to justify a NC = 2, the operator will be asked to provide detailed arguments, or, for example, to apply the OMEGA 20 method. As a general rule, MMRs involving human action are allocated a NC = 1, except in the special case of relatively simple actions and/or those for which the operator is trained and instructed (e.g.: switching on an AU in the control room in response to an alarm).
Is it possible to enhance the value of several man-made barriers in the same scenario?
Yes, provided that the independence of the barriers is verified....
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Frequently asked questions
Abbreviations and acronyms
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Bibliography
Iddir (O.), Principles for assessing the probability of failure of risk control measures [SE 4057].
Iddir (O.), Quantifying risk in hazard studies [G4218].
Mortureux (Y.), Human and organizational dimensions in feedback [SE3805].
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