An alert at the San Onofre Nuclear Generating Station caused by an ammonia leak was canceled Tuesday evening, according to officials, but not before emergency centers in two counties were activated.
The leak in the steam system of one unit at the nuclear plant occurred at about 2:50 p.m. Workers in the unit were evacuated.
According to a plant statement, the public's safety was not threatened and no action was required of nearby residents.
At about 6:30 p.m., the San Diego County posted a notice on its Facebook page reporting the alert had been called off.
"The onsite emergency response team contained the release and cleaned up the hazardous material at the unit. The leak had no impact on radioactive material or cooling units," the county said.
The San Diego County and Orange County both activated emergency operating centers in response to the alert.
Approximately 30 gallons of leaked ammonia was being collected in a basin underneath a tank in the affected unit.
Because of the strong ammonia smell, there was a precautionary evacuation of some plant workers whose jobs are located close to where the leak was found, according to plant spokesman Scott Andresen.
No injuries were reported.
–City News Service contributed to this report.