Which description best matches LOOP mitigation strategies?

Which description best matches LOOP mitigation strategies?

• A. Loss of offsite power is mitigated by operator actions only
• B. LOOP is mitigated by backup power limited to batteries
• C. LOOP is mitigated by external grid upgrades only
• D. LOOP is mitigated by on-site diesel generators, diverse power sources, and automatic transfer to backup while maintaining safe shutdown and cooling

Answer: (D)

When a loss of offsite power occurs, the plant must keep its essential safety systems energized and the reactor cooled without depending on the grid. The best description is to have on-site diesel generators ready to start automatically, provide diverse power sources so a single failure won’t disable critical equipment, and automatically transfer to backup power while maintaining safe shutdown and cooling. This combination ensures continuous, reliable power to pumps, valves, and cooling systems the moment grid power is lost, without relying on operator action or just one type of backup. Relying on operator actions alone isn’t enough because the response needs to be immediate and automatic to prevent rapid cooling loss. Batteries alone can bridge a short time but cannot sustain long-term safety cooling. Relying on external grid upgrades doesn’t guarantee power during an outage and misses the need for immediate, on-site power and automatic transfer.

When a loss of offsite power occurs, the plant must keep its essential safety systems energized and the reactor cooled without depending on the grid. The best description is to have on-site diesel generators ready to start automatically, provide diverse power sources so a single failure won’t disable critical equipment, and automatically transfer to backup power while maintaining safe shutdown and cooling. This combination ensures continuous, reliable power to pumps, valves, and cooling systems the moment grid power is lost, without relying on operator action or just one type of backup.

Relying on operator actions alone isn’t enough because the response needs to be immediate and automatic to prevent rapid cooling loss. Batteries alone can bridge a short time but cannot sustain long-term safety cooling. Relying on external grid upgrades doesn’t guarantee power during an outage and misses the need for immediate, on-site power and automatic transfer.