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

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

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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.