Two nuclear power plant units shut down from storm

Constellation Energy Group (NYSE: CEG)’s 1,735 MWe Calvert Cliffs nuclear plant in Maryland was shut down after winds from Hurricane Irene August 27 blew a piece of aluminum siding into the main transformer at the site. The plant declared an unusual event, the lowest of four classifications, through the U.S. Nuclear Regulatory Commission (NRC). The unusual event was cancelled early August 29. Calvert Cliffs uses two Combustion Engineering pressurized water reactors.

Exelon Corp. (NYSE: EXE) shut down the 619 MWe Oyster Creek nuclear power plant in New Jersey as a precaution.

Bloomberg reported that Exelon was waiting to resume operations at Oyster Creek after on-site inspectors complete a safety assessment. Oyster Creek uses a General Electric (NYSE: GE) Type 2 boiling water reactor.

More than a dozen other nuclear plants in the path of the hurricane made it without losing power to their reactors, Bloomberg said.

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