Indian Point spokesman Jim Steets says the third test is a "very positive indication that the sirens will perform as designed."
All but one of the 172 of the new sirens functioned properly during a four-minute, full-volume test on Thursday.
NRC spokesman Neil Sheehan says his agency will release a final report on the system in January.
Indian Point owner Entergy Nuclear missed three separate deadlines to test the system in 2007.
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