Dominion ended the alert at its North Anna Power Station in Virginia at 11:16 a.m. EDT on August 24 after starting a reactor cooling pump for each of the two units. The reactors were cooled by natural circulation and emergency pumps while the reactor coolant pumps were not operating.
The alert was issued following an earthquake that affected parts of the eastern U.S. on Aug. 23.
The station remains in a Notification of Unusual Event (NOUE), the least serious of four Nuclear Regulatory Commission emergency classifications, while the reactor cool-down and inspections of plant equipment and systems continues.
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