(AP) - The operator of the nation's oldestnuclear power plant has manually shut down its reactor afterequipment failed on one of its two transformers.

Officials at the Oyster Creek Nuclear Generating Station in NewJersey say Saturday night's shutdown occurred without incident. Butthey won't say how long it's expected to last or when repairs willbe completed at the facility in Lacey Township, about 60 miles eastof Philadelphia and 75 miles south of New York City.

Plant spokesman David Benson says the shutdown caused no risk tothe public and no radiation was released.

Oyster Creek opened in December 1969 and just received a new20-year operating license. It generates enough electricity to power600,000 homes a year.

Anti-nuclear and environmental groups say the plant is unsafe.