Unit 2 at the Susquehanna nuclear power plant, in Luzerne County, Pennsylvania, is in the process of being taken offline.
Operators at the PPL Corp. (NYSE: PPL) site say the turbine blades need to be inspected after data from the extensive vibration monitoring equipment shows that a few turbine blades may have developed small cracks.
"We have been monitoring turbine performance closely for the last several years, and continue to work with the manufacturer to address conditions that are associated with cracks developing," said Timothy S. Rausch, senior vice president and Chief Nuclear Officer. "We continue to take appropriate actions based on the monitoring data we are collecting to ensure long-term safety and reliability. That's why we decided to shut down Unit 2 now to inspect blades and replace any that are found to have developed cracks."
Workers will also perform additional maintenance while Unit 2 is offline.
Unit 1 was recently modified with new blades, designed to reduce vibration, and will continue to operate. PPL plans to install the newly designed blades on Unit 2 during its next scheduled refueling outage in the spring of 2015.
Susquehanna nuclear power plant is jointly owned by PPL Susquehanna LLC and Allegheny Electric Cooperative Inc.