The Unit 2 reactor at the PPL Susquehanna Steam nuclear power plant in Salem Township reconnected to the electrical grid Tuesday after a shut down last Thursday for a valve repair.
The reactor came back on line after a planned shutdown for routine maintenance when operators discovered a leak in what the company said was a non-safety-related water supply pump.
Unit 1 continued to operate at full power.
The Unit 2 reactor has been under increased scrutiny by the U.S. Nuclear Regulatory Commission (NRC) after four unplanned shutdowns, two with complications, since December 2012.
The reactor is one of six in the nation in NRC’s most serious category, “degraded cornerstone.” PPL is implementing a plan to address the issues under NRC oversight.