MOSAR - Method presentation

Analyzing the risks of an industrial facility is a complex process, because the facility itself is a complex structure made up of machines and storage facilities, interacting with each other, with operators and with the environment. To maximize the chances of identifying the majority of a facility's risks, a logical method has been proposed: the Organized Systemic Risk Analysis method, or MOSAR. This method is based on systemic modelling . After breaking down the facility into sub-systems and systematically identifying the hazards presented by each of them, these sub-systems are linked together to reveal major risk scenarios. This part of the analysis is an advanced PRA (Preliminary Risk Analysis), as it does more than simply sift through pre-established grids derived from experience feedback. Rather, it uses the MADS model (Méthodologie d'analyse de dysfonctionnement des systèmes) to model the various types of hazards and build up possible scenarios. These scenarios are ranked by negotiating objectives. Barriers are systematically sought to neutralize these scenarios, and their qualification over time ensures their durability. The process can be continued with a detailed analysis of the operational safety type, using tools such as FMEA (Failure Mode, Effects and Criticality Analysis) (see article FMEA-Medium [AG 4 220] in the Industrial Enterprise treatise), fault trees (see article Fault, Cause and Event Trees), etc. (see article FMEA-Medium in the Industrial Enterprise treatise). in this treatise), HAZOP (Hazard and Operability study) .

Its modular structure makes it highly flexible in use. It ends with the construction of intervention plans.

The MADS model, developed in the 1980s by a group of engineers from the...