A full-volume test of the Indian Point Energy Center siren system will be conducted between 10 and 11 a.m. Wednesday throughout the 10-mile Emergency Planning Zone surrounding the nuclear-power plant in Buchanan.

Sirens will sound simultaneously for four minutes, said officials in Orange County, part of the test zone. The sirens will sound at full volume for the entire duration of the test.

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No action on the part of the public is necessary or required for the drill.

If the sirens were sounded during an actual emergency, residents would listen to an Emergency Alert System (EAS) or tune in to a radio or television station for information and instructions about any action to be taken, officials said. Sounding the sirens is not a signal to evacuate.

The Indian Point nuclear reactors supply 25 percent of the electricity used in Westchester and New York City.