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DEFENCE IN DEPTH
Defence in depth: reactors

STARTING WITH THE RIGHT QUESTION

 

Depending on whether or not an initiator has occurred, the questions you ask are slightly different. They may sound similar but having this clarity up front is essential to making the appropriate rating.

Initiator occurred?

Safety components found degraded?

Identify which initiator and then identify the safety systems that are needed to work

Identify the initiators that challenge the degraded components and the other safety systems that protect the safety function against the initiator.