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UPDATE: Prairie Island nuclear plant terminates "unusual event" notice

Prairie Island nuclear plant has terminated its "notification of unusual event."

The event was declared today at 6:24 a.m. and ended at 11:36 a.m. following "thorough assessment of plant conditions" and Unit 2's coolant system, Xcel Energy officials said.

The alert was triggered by an indication that there was a decrease in water levels in the reactor coolant system in Unit 2, which currently is shut down for refueling. Further investigation revealed there was no leak, officials said.

No radiation was released, there was no impact on the public or plant employees and plant operations were not affected by this event.

Unit 2 remains offline for its refueling outage, and Unit 1 is operating at full power.

The declaration is the lowest emergency level in the Nuclear Regulatory Commission's classification system, indicating potential reduction in the level of safety at the plant but no danger to public safety.