9. Glossary
Safe failure fraction (SFF)
Proportion of the overall rate of random hardware failures in a device that results in a safety-related failure or a detected hazardous failure, i.e. detected by a diagnostic test (based on report Ω 10 – INERIS).
Aussi bon que neuf; as good as new (AGAN)
Calculation assumption used in IEC 61508-6. After each periodic test, the PFD(t ) value is assumed to return to its initial value.
Safety Integrity Level; SIL level
IEC 61508 introduces four discrete levels whose function is to specify requirements (qualitative and quantitative) concerning the safety integrity of safety functions. Each SIL level has a corresponding risk reduction factor.
Probabilité de défaillance moyenne à la demande; Average of Probability Failure...
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