• Workers at PPL's nuclear Susquehanna Unit 1 have traced a water leak in the containment structure to a joint weld in piping.
• The culprit was where a 4-inch blank-flanged pipe used in chemical decontamination meets a 28-inch pipe on the suction side of a recirculation pump.
• The plant, which puts 1,260 MW into the Pennsylvania grid, shut down Tuesday when workers spotted the leak.

From the article: "PPL Corp. (NYSE: PPL) said it has found the source of a leak inside the 1,260 MW Unit 1 containment structure at the Susquehanna nuclear power plant in Pennsylvania. The unit was shut down on June 19. ..."