Practical sheet | REF: FIC0538 V1

LOPA: a risk analysis method

Author: Olivier IDDIR

Publication date: June 10, 2012 | Lire en français

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1. What is the aim of the LOPA method?

The LOPA method is a semi-quantitative method developed with a view to :

  • assess the adequacy between the barriers implemented and the level of risk targeted;

  • determine the need for new barriers;

  • define the minimum "requirements" for the probability of failure of the barriers to be put in place in the event that the existing barriers are unable to justify an acceptable risk;

  • assess the residual frequency of occurrence of an accident scenario.

The LOPA method allows you to :

  • complete the HAZOP analysis if the working group considers the scenario too complex or the consequences too significant;

  • determine the SIL levels required...

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