NRC cites Millstone Unit 2 nuclear power plant in Connecticut

Source: US Nuclear regulatory Commission

The Millstone Unit 2 nuclear power plant will receive additional oversight from the Nuclear Regulatory Commission as a result of a “White” (low to moderate safety significance) inspection finding that has now been finalized.

The inspection finding involves the failure of Millstone Unit 2 personnel to carry out their assigned roles and responsibilities and inadequate reactor power-level management during main turbine control valve testing. This contributed to an unanticipated reactor power increase, from 88 to 96 percent of rated thermal power, on Feb. 12, 2011.

An NRC team identified the finding during a Special Inspection conducted from Feb. 22 through April 14, 2011, at Millstone Unit 2, which is located in Waterford, Conn., and operated by Dominion Nuclear Connecticut, Inc. The Special Inspection was initiated in response to the unintended reactor power change.

“While the NRC did not identify any impacts on plant safety due to the Feb. 12th event, the agency holds control room operators to the highest standards,” NRC Region I Administrator Bill Dean said. “This inspection finding signals the need for plant personnel to step back and learn from this event in order to prevent it from occurring again.”

On July 19, NRC staff held a Regulatory Conference with Dominion to discuss the inspection finding. During that meeting, the company provided additional information for the staff’s consideration and described corrective actions taken or planned in response to the event. 

At a future date, the NRC will perform a supplemental inspection at Millstone Unit 2 to evaluate the company’s corrective actions.

Dominion’s Millstone Power Station is located in southeast Connecticut and generates 2,020 megawatts of nuclear power from two operational Units (2&3).

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