In the hierarchy of safety parameter limits, which item comes directly after "Normal Automatic Controls"?

• A. Alarms / Operator Action
• B. Automatic Trips / Relief
• C. Emergency Operating Procedure / Operator Action
• D. Tech Spec Limit

Answer: (A)

Layers of protection build safety progressively from automatic control to human action. After normal automatic controls keep the process within its intended range, the next safeguard is alarms that alert operators and prompt them to take action. This step gives a chance to correct drift without triggering automatic shutdown, maintaining safe operation while still involving human oversight.

If those alarms and operator actions don’t restore conditions, the system moves to automatic trips or relief—automatic interventions that shut down or reduce load to prevent unsafe states. For more severe or persistent abnormalities, emergency operating procedures guide operator actions under predefined steps. Tech Spec limits sit at the highest level, representing the most restrictive operating conditions with mandatory actions to restore safe conditions or safely shut down.

So the item that comes directly after Normal Automatic Controls is the alarms and operator action layer, because it’s the immediate next line of defense that involves human intervention before automatic trips.