Risk Analysis Method of Human Deviation in Operational Situations

摘要

Different sets of conditions of use of a machine are defined: the Boundary Conditions unacceptable by Designers (BCD) or unacceptable by Users (BCU), the Conditions Tolerated by Users (CTU), and the Boundary Conditions Tolerated by Users (BCTU) which are conditions acceptable by users but unacceptable by designers. Undesirable events occur on the BCD set or on the BCU set. The paper proposes a risk assessment method of operational situations that are occurring on the BCTU set. Even if those situations appear to control an undesirable event or to optimise system performance, they may cause the occurrence of an undesirable event. The assessment of risks associated to the BCTU related situations considers several dependability criteria and focuses on qualitative immediate and probable consequences. Examples on an industrial field illustrate such an assessment.