(Londonderry Township) -- Three Mile Island nuclear power plant is scheduled to test its emergency warning sirens today.
The first test will be held at approximately 8 o'clock this morning.
The 96 sirens around the plant in Londonderry Township, Dauphin County, have recently been updated withimproved sound output and a battery back-up system.
The upgrades are part of a 13 million dollar project.
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