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Failure Mode Reasoning (FMR) is a novel approach for analyzing failure in aSafety Instrumented System (SIS). The method uses an automatic analysis of anSIS program to calculate potential failures in parts of the SIS. In this paperwe use a case study from the power industry to demonstrate how FMR can beutilized in conjunction with other model-based safety analysis methods, such asHiP-HOPS and CFT, in order to achieve a comprehensive safety analysis of SIS.In this case study, FMR covers the analysis of SIS inputs while HiP-HOPS/CFTmodels the faults of logic solver and final elements. The SIS program isanalyzed by FMR and the results are exported to HiP-HOPS/CFT via automatedinterfaces. The final outcome is the collective list of SIS failure modes alongwith their reliability measures. We present and review the results from bothqualitative and quantitative perspectives.

Failure Mode Reasoning in Model Based Safety Analysis