Breaking: Alert at PPL Nuclear Plant --19 municipalities involved in Level 2 alert 10 Aug 2010 (PA) An alert has been issued at PPL's Susquehanna Nuclear Power Plant near Berwick after a leak inside one of the buildings. PPL officials said no radiation was involved. PPL officials said Freon is leaking from a cooling system inside the Unit 1 reactor building. PPL said the Freon is still leaking and crews are trying to determine if it is safe for workers to stop the leak or if special teams using oxygen suits will be needed to stop the flow of Freon. The Freon supplies a cooling system in Unit 1. The alert system has four stages; four being the highest alert.