Upgraded TMI Emergency Warning Sirens to Be Tested

FOR IMMEDIATE RELEASE

Contact: Ralph DeSantis  Exelon Nuclear — Three Mile Island

717-948-8930

Upgraded TMI Emergency Warning Sirens to Be Tested

Exelon continues to invest in state-of-the-art emergency preparedness equipment

LONDONDERRY TWP., PA. (Jan 27. 2012) – Exelon Nuclear will begin testing the new sirens that are being installed in the area around the Three Mile Island Generating Station on Monday, Jan. 30. The new sirens use state- of-the-art technology and are part of a comprehensive emergency preparedness program designed to protect the health and safety of the public during all types of events. .

The tests will be conducted on individual sirens over the next three months. Exelon Nuclear is replacing all 96 emergency sirens in the 10 miles around TMI with sirens that include a redundant back-up power supply (batteries) to ensure they can operate even during a blackout condition. Personnel began installing the new sirens in October, 2011.

This $2.8 million investment around Three Mile Island is part of Exelon Nuclear’s commitment to replace and upgrade the emergency sirens at all of the sites in the mid-Atlantic including Limerick Generating Station, Peach Bottom Atomic Power Station, and Oyster Creek Generating Station. This project will involve a total investment of more than $9 million and the replacement of 400 sirens.

The typical duration of the siren testing around TMI will be between 30 and 60 seconds and could occur several times in a row at each siren. The siren acoustics will be similar to those of the current emergency sirens.

The testing is being coordinated with county emergency management officials. Residents may contact the counties at the following numbers if they have questions during the testing:

Cumberland County: (717) 238-9676 Dauphin County: (717) 558-6900 Lancaster County: (800) -808-5236 Lebanon County: (717) 272-7621 York County: (800) 427-8347

The new and existing sirens will operate concurrently for a period of time to ensure the new system is operating properly. Completion of the project and removal of the existing sirens is scheduled for 2013.

The upgraded warning sirens are one of several methods used by county emergency management authorities to provide notification of emergencies. The sounding of the sirens is not a signal to evacuate, but to tune to the local Emergency Alert Broadcast Station.