2. Distinguish between the different ways of controlling risks

As a reminder, the function of safety barriers, or risk control measures, is to reduce the probability of risk occurrence and/or minimize its consequences.

They present a material element, or a procedure, designed to interrupt or modify the accident scenario in such a way as to reduce either the frequency (prevention barrier) or the consequences (protection barrier).

They include :

• engineered safety barriers (EBS), which are a material element, a safety device or an instrumented safety system set up to reduce both the probability and the consequences ;

• and organizational safety barriers, i.e. a human activity (operation or procedure) that counteracts the chain of events likely to lead to an accident, or reduces its consequences.

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