Three Mile Island Nuclear Generating Station is conducting a full-volume emergency warning test Thursday afternoon.

The Dauphin County plant will test its 96 sirens at 12:15 p.m. Thursday, Dec. 5, according to a tweet from owner Exelon Generation. A post from Middletown Area School District notes the sirens will sound for a full 3 minutes.

More: TMI shuts down, local officials predict economic hit

Although the plant shut down this September, officials are still running the semi-annual test, which will cover a 10-mile radius surrounding the plant, affecting parts of Cumberland, Dauphin, Lancaster, Lebanon, and York counties.

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