Distinguish between automatic reactor trip setpoints and manual reactor operator actions.

Distinguish between automatic reactor trip setpoints and manual reactor operator actions.

• A. Automatic trip setpoints are operator-triggered; manual actions are automated shutdowns.
• B. Automatic trip setpoints trigger SCRAM when parameters exceed limits; manual actions are operator-initiated shutdowns.
• C. Manual actions are automatic safety features; automatic trips are user-initiated shutdowns.
• D. Trip setpoints are chosen after an event.

Answer: (B)

Automatic reactor trip setpoints are fixed safety thresholds in the plant’s monitoring system. When parameters such as power, temperature, pressure, or flow cross these limits, the safety logic automatically initiates a rapid shutdown (a SCRAM) without human input. Manual reactor operator actions are actions taken by trained staff to shut the reactor down according to procedures, based on judgment or planned operations, and do not rely on automatic triggers to occur. This distinction is captured by saying automatic trip setpoints trigger SCRAM when limits are exceeded, while manual actions are operator-initiated shutdowns. Trip setpoints are predefined safety boundaries, not chosen after an event.

Automatic reactor trip setpoints are fixed safety thresholds in the plant’s monitoring system. When parameters such as power, temperature, pressure, or flow cross these limits, the safety logic automatically initiates a rapid shutdown (a SCRAM) without human input. Manual reactor operator actions are actions taken by trained staff to shut the reactor down according to procedures, based on judgment or planned operations, and do not rely on automatic triggers to occur.

This distinction is captured by saying automatic trip setpoints trigger SCRAM when limits are exceeded, while manual actions are operator-initiated shutdowns. Trip setpoints are predefined safety boundaries, not chosen after an event.