Unit 2 of PPL's Susquehanna nuclear power plant shut down automatically at 12:33 p.m. EDT Monday (6/6) because of a problem with the electric transmission network.

"The reactor shut down safely," said Lou Ramos, PPL's community relations manager for Susquehanna. "We are investigating the cause of the problem."

The plant's Unit 1 reactor continues to operate at 100 percent power.

The Susquehanna plant, which is operated by PPL and located in Luzerne County about seven miles north of Berwick, is owned jointly by PPL Susquehanna LLC and Allegheny Electric Cooperative Inc.