All Four Exelon Nuclear Mid-Atlantic Plants Operating Safely Following Regional Seismic Activity

Exelon Nuclear

FOR IMMEDIATE RELEASE

KENNETT SQUARE, PA. (August 23, 2011) - None of Exelon Nuclear's four Mid-Atlantic nuclear energy stations was affected by this afternoon’s seismic activity in Virginia, and all continue to operate safely at this time. An “Unusual Event” was declared at each of the stations following the seismic activity, in accordance with plant procedures: Peach Bottom Atomic Power Station, Three Mile Island Generating Station and Limerick Generating Station in Pennsylvania, and Oyster Creek Generating Station in New Jersey.

Plant equipment continued to function normally at each of the Exelon Nuclear stations. Operators are currently performing "walk-downs" to identify any potential affects from the seismic activity, but no damage to equipment or plant operations has been identified at this time. Each plant continued to operate at normal power level throughout the event and no evacuations or additional safety measures were required.

Nuclear energy plants are designed specifically to withstand the impact of earthquakes and other severe acts of nature. The earthquake, reported to be at a magnitude of 5.9 on the Richter Scale, did not challenge the engineered design of the Exelon facilities.

An “Unusual Event” is the lowest level emergency classifications as determined by the Nuclear Regulatory Commission.