Three Mile Island Nuclear Generating Station

Three Mile Island Nuclear Generating Station is located on Three Mile Island in the Susquehanna River about a mile east of the west shore town of Goldsboro, foreground, in Newberry Township.

(PAUL CHAPLIN, The Patriot-News/file)

Do not be alarmed if you see a lot of emergency vehicles setting up at Three Mile Island Tuesday afternoon.

Also, don't be concerned if you hear announcements from the nuclear power plant's public address system. It's all part of a drill.

Counties, municipalities and school districts within a 10-mile radius of the plant will take part in the drill, which simulates a variety of emergency scenarios. It's part of a plan to ensure emergency workers on and off site can be ready to respond in the event of a real emergency.

Federal officials will evaluate the responders' performances.

The offsite emergency sirens will not be used during the drill. If you hear them, pay attention.