SAN ONOFRE (CBS) — Southern California Edison has contained an ammonia leak at the San Onofre nuclear power plant in San Diego County.

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Orange County Sheriff’s officials say that the leak was detected at about 3:10 p.m. Tuesday, prompting officials to issue an alert.

The leak occurred in a steam system used to drive the station’s turbines, SCE said.

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SCE reported that “the approximately 30 gallons of leaked ammonia is being collected in a basin underneath the tank that was designed for that purpose.”

No radiation is currently escaping from the power plant, Lt. Roland Chacon said.

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No evacuations have been ordered and there is no danger to the public, SCE said.