7. Glossary
BPCS ( Basic Process Control System )
Process supervision system.
Criticality
The criticality of a scenario corresponds to its probability/severity ratio. This pairing is generally reported in a matrix to assess the acceptability of the risk (such as the criticality matrix introduced in the circular of May 10, 2010).
LOPA
Layer Of Protection Analysis.
SIL level
A discrete level (of four possible) for specifying the safety integrity requirements of the safety functions to be allocated to safety-related E/E/PE systems. Safety integrity level 4 has the highest degree of integrity; level 1 has the lowest.
SIF ( Safety Instrumented System )
A safety instrumented function...
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