The Davis-Besse Plant, outside Toledo, is one of two commercial nuclear power plants in Ohio (the other is the Perry plant, near Cleveland). Davis-Besse has been shut down for technical problems a few times since going on line in 1977. When it was shut down in February 2002 for refueling, operators discovered that boric acid had been dripping on the top of the reactor head, and had eaten away about 70 pounds of steel. The six inch deep hole, in the shell that holds the coolant layer around the reactor core, was 3/16ths of an inch from going all the way through, which, should it have ruptured due to the one ton per square inch pressure inside, would have produced a potentially catastrophic accident. The First Energy Company of Akron, which owns the plant, repaired the reactor head, and the plant went back online in 2004.