Akron-based FirstEnergy says workers have found more cracks in the concrete building housing the reactor of the Davis-Besse nuclear power plant near Toledo.
Concrete sampling also shows three cracks first detected in the shield building have grown larger. But the company and the Nuclear Regulatory Commission say the structure is safe. The company says high-definition cameras now used for inspecting core samples identified the previously unseen cracks. Hairline cracks were found in the 2.5-foot thick concrete in 2011. FirstEnergy determined they were caused by wind-blown moisture seeping into the concrete and freezing. FirstEnergy has since weatherproofed the building.