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The operator of an Ohio nuclear plant near Toledo, OH, along Lake Erie found more cracks in the concrete building housing the reactor.

FirstEnergy Nuclear Operating Corp. said concrete sampling also showed three cracks first detected in the shield building of the Davis-Besse plant near Toledo in 2011 have grown a bit. But the company and the Nuclear Regulatory Commission (NRC) said Friday the findings don’t mean the structure is unsafe.

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The company says high-definition cameras now used for inspecting core samples identified the previously unseen cracks.

Plant officials first found hairline cracks in the 2.5-foot thick concrete in 2011. FirstEnergy determined the cracks were the result of wind-blown moisture seeping into the concrete and freezing.

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FirstEnergy has since weatherproofed the building.

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