An activist group is questioning the soundness of a Northwest Ohio nuclear plant where a 30-foot hairline crack was recently discovered.
The crack was found in the thick concrete on the outside of the reactor containment building at the Davis-Besse plant in Oak Harbor outside Toledo.
The Plain Dealer of Cleveland reports that the Union of Concerned Scientists has written the U.S. Nuclear Regulatory Commission asking whether the concrete walls were built to adequate engineering specifications.
The NRC said Monday that the letter is being reviewed. Plant owner FirstEnergy Corp. responded by saying that the walls were designed properly and that the building has been inspected thoroughly.
The plant has been shut down for installation of a new 82-ton reactor head, replacing one that cracked.