Safety systems and safety functions need to provide the necessary functionality in all foreseen circumstances. In the vulnerability analysis safety systems are assessed for relevant scenarios and accidental events to ensure that the systems will provide protection of personnel, environment and assets as assumed.

The vulnerability analyses are performed as a workshop with participants from a limited group of relevant personnel.

These assessments are performed systematically, system by system in sequence. The analysis should be performed at a stage when the design of the safety systems are sufficiently detailed, however not too late to incorporate changes as a result of findings in the analysis.