The leak was discovered on June 15 and workers determined that the plant needed to be shut down. Steam was observed coming from a vent line that comes off the top of the recirculation flow control valve, according to Power Engineering. Workers with FirstEnergy said the steam appeared to be coming from a weld location where the vent line comes out of the flow control valve.
A FirstEnergy spokesperson told Reuters that the leak did not endanger the health of the public or of workers at the plant. The plant came back online in May after a maintenance and turbine upgrade outage.
The Perry nuclear power plant made headlines in May 2013 when two goldfish were discovered swimming in a pitched placed in a restricted area of the plant. An NRC investigation found that two contractors put the fish there as a joke.