Glossary
Instrumented risk control measures

Instrumented risk control measures

Safety barriers comprising technical and/or organizational elements involving safety instrumentation. A MMRI comprises an information input (sensor/detector), a processing system (PLC, relay system, etc.) and an action, which may be automatic or require human intervention to implement.

Instrumented risk control measures

A MMRIC is a MMRI integrated into the plant's control system.

Safety instrumented risk control measures

MMRI whose components are dedicated solely to safety. However, the elements of an MMRIS can also be used for plant operation, provided :

• they are not likely to lead to an initiating event at the origin of the accident scenario;

• that their safety activities take precedence over all their other activities;

• they are not already taken into account in a...