Diesel Generators Start at North Anna Nuclear Plant During Loss of Offsite Power Line

Virginia's North Anna nuclear plant briefly lost one off-site power line Thursday, causing two emergency diesel generators to start automatically.

At 7:20 p.m., a 34.5 kilovolt line connected to a reserve station service transformer failed, deenergizing emergency busses at both reactors, according to a report filed with the Nuclear Regulatory Commission. The units at the Dominion plant were operating at full power and remained online throughout the event. Unit 2 dropped to 96 percent power at the time of the report but had returned to full power by Friday.

After about two hours, the affected emergency bus at unit 1 was restored and its diesel generator shut off. The second generator continued to operate at unit 2 while crews worked to restore the off-site power line, according to the NRC. On overnight storm in central Virginia where the plant is located had dropped 2.5 inches of rain and left more than 1,800 people without power Thursday night.

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