The hazard rate HR( hazard) may be defined in terms of the source reliability and the protection layer, as follows:
HR(hazard) = FailureRate( hazard) x [ 1 - PrRecovery( hazard) ]
where FailureRate( hazard) = 1 / MTBF( hazard)
and PrRecovery(hazard) = PrAlarming( hazard) x PrPerception( hazard) x PrTroubleshooting( hazard) x PrResumption( hazard)
where the probabilities are of successful operational activities.
Updated on 12 Oct 2016.