Off-Site Power Failure Shuts 2 CT Reactors

Wednesday, May 28, 2014 @ 05:05 PM gHale

An off-site electrical fault shut down the Millstone nuclear power plant’s number 2 and 3 reactors in Waterford, CT, early in the morning May 25.

All safety systems functioned as designed and that there were no health or safety issues to the public as a result, said Neil Sheehan, public affairs officer for the Nuclear Regulatory Commission (NRC).

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Sheehan said the plant’s emergency diesel generators activated and provided power to the safety systems until they could restore power.

The shutdown, which occurred at about 7:15 a.m., ended up classified by the NRC as an “unusual event,” the lowest of the agency’s four emergency classifications, Sheehan said.

Sheehan said initially no one really knew what caused the loss of off-site power, but added preliminary indications were that it came from the plant’s “switch yard” and the local power transmission company was working to restore electrical flow.

Off-site power ended up restored early Sunday afternoon and the cause was an electrical fault or short in a power line, Sheehan said.

The reactors remained shut down pending a review of the incident, Sheehan said.

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