What is the role of alarm annunciations during a core protection event?

• A. Alarms are disabled during a core protection event to avoid confusion.
• B. Alarms alert operators to underlying fault conditions, aiding post-trip analysis and situational awareness without delaying protective actions.
• C. Alarms replace protective actions.
• D. Alarms are used to override protective actions.

Answer: (B)

Alarms during a core protection event are there to provide a real-time picture of what happened, signaling underlying fault conditions that contributed to the event. This information supports situational awareness and post-trip analysis by showing which sensors or channels annunciated and how the event evolved, helping identify root causes and guide corrective actions after the system has protected the core. The alarms are informational and designed not to delay protective actions, which are automatic or rapid by design; they do not replace or override those protections. In practice, alarms help the operator understand the sequence, verify that protection acted as expected, and document the event for post-event review.