Description
The risks generated by the plant – represented by accidental scenarios – are demonstrated upon performing risk assessment. For each of the scenarios, the safety functions are determined. These functions are fulfilled by safety barriers. The probability of an accident in a hazardous installation depends, i.e. on the performances of the safety barriers, i.e. their capability of efficiently fulfilling the safety function which is allotted to them. The development of the approach presented in this document was guided by the requirement of having tools with which the performance of human safety barriers may be evaluated and demonstrated. In present practices evaluation and management of risks are performed by « technicians » (notably engineers). The goal of the approach described in this report is especially to provide to non-specialist “risk technicians” of human factors, an evaluation method in order to characterize and evaluate the performance of human safety barriers.
