The siren alert system will be tested Tuesday at the Fort Calhoun Nuclear Power Station in eastern Nebraska.
Omaha Public Power District says the radio-controlled sirens are placed within 10 miles of the plant. The plant sits on the southeast side of Blair, across from Iowa on the Missouri River and about 20 miles north of Omaha.
OPPD says the sirens will sound for four minutes sometime between 9 and 10 a.m. The annual test may be delayed if the weather is severe.
If something that posed a danger to the public were to occur at the plant, the sirens would sound to signal people that they should tune into local broadcast media and follow Emergency Alert System guidance.