5. Glossary
Aussi bon que neuf; as good as new (AGAN)
Calculation assumption used in the standard IEC 61508-6 . After each periodic test, PFD(t) is assumed to return to its initial value.
Danger; hazard
Potential source of damage ( EC 61511 :2016 ).
Risk; risk
Combination of the probability of damage and its severity ( IEC 61511 :2016 ).
Safe failure fraction (SFF)
Proportion of a device's overall rate of random hardware failures that results in a safety failure or a detected unsafe failure (
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Glossary
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