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Just after getting Unit 1 at the Susquehanna nuclear power plant in Pennsylvania up and running, PPL Corp. shut down its 1,190-megawatt Unit 2 after a computer system that controls the reactor’s water level malfunctioned.

“Operators manually shut down the reactor when they identified the malfunction,” PPL said in a statement.

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During the outage, employees will address the control system malfunction and begin a previously scheduled turbine blade inspection, PPL said.

Unit 1 continues to operate.

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Unit 1 at Susquehanna resumed generating electricity Wednesday after completing a turbine blade inspection.

The inspection found signs of cracking on turbine blades, confirming data from diagnostic equipment installed in the spring of 2012. PPL ended up replacing those blades.

“The inspection was another step in what has been a very systematic approach to understand what’s causing the cracks,” said Timothy S. Rausch, PPL Susquehanna senior vice president and chief nuclear officer. “We now have a solid understanding of the cause and are finalizing short-term and long-term plans to resolve the issue.”

No that Unit 2 is shut down, PPL Susquehanna will conduct a similar inspection based on information provided by the diagnostic equipment installed on that unit, and will replace any cracked blades found on the turbine.

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