The Nuclear Regulatory Commission is satisfied with the results of concrete tests done on the Davis-Besse nuclear plant in Ohio despite not being able to validate the cause of the cracks in the reactor's shield building. Area residents were assured that the building underwent a "vigorous inspection," according to Cynthia Pederson, a regional director of the NRC. FirstEnergy, the operator of the plant, has until the end of February to determine the cause of the cracks.

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