0 votes

1 Answer

0 votes
answered Mar 28, 2014 by odadmin (21,030 points)

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.