From today’s NRC Event Notification Report page:
1. The Fort Calhoun nuclear power plant in Nebraska began a controlled shutdown of the facility’s nuclear reactor as the National Weather Service issued a warning that the Missouri River would rise above the station’s allowable flood stage. The plant will get to zero power within 36 hours.
2. The Prairie Island nuclear power plant in Minnesota reported that the facility’s reactor failed a safety test due to a problem in the unit’s Safety Injection Automatic Actuation Relay. When the problem could not be resolved within six hours, operators began a Limiting Condition of Operation shutdown. As of the latest report, the reactor is at 55 per cent power and continuing to ramp down.
3. And the Comanche Peak nuclear power plant in Texas issued a 60-day report on an April 22 incident in which the Unit 2 reactor’s Emergency Diesel Generator started unexpectedly. Seems like a long time to issue a report that didn’t say exactly why the EDG started:
The specific train and system that actuated was the Unit 2, Train A, Emergency Diesel Generator. During the inadvertent EDG start the system started and functioned correctly, and the EDG only reached 300 RPM before it was shut down.