Can the severity of the consequence be reduced 100% by mitigation independent protection layer?

Asked by Normandy 7 years, 6 months ago | 1 Answers

1 Answer

odadmin 7 years, 6 months ago

No, each independent protection layer has a nonzero probability of failure on demand.

When it succeeds, a mitigation independent protection layer reduces the frequency of the severe consequence, and allows or generates a less severe consequence, therefore, constituting a different scenario and requiring a separate analysis. These are two separate scenarios for the purpose of LOPA.