LOS ANGELES (AP) — A federal report Tuesday concluded that the Nuclear Regulatory Commission missed opportunities to spot potential trouble with an equipment swap that led to the installation of faulty machinery in a Southern California nuclear power plant.

The San Onofre plant, located between Los Angeles and San Diego, was closed for good last year by Southern California Edison after a battle over whether it was safe to restart. The plant had been idle since January 2012, after a small radiation leak led to the discovery of unusual damage to hundreds of tubes inside virtually new steam generators.

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