As reported by the Associated Press, a design flaw dating back to the early 1970s raises concerns about heavy equipment support structures at the Omaha Public Power District-owned/Exelon-operated Fort Calhoun atomic reactor in Nebraska. Both the utility, and the U.S. Nuclear Regulatory Commission (NRC), missed the flaw, both during initial licensing four decades ago, as well as during the rubberstamp of a 20-year license extension in 2003.
The article lists the many woes which have kept the reactor shutdown since before historic floods on the Missouri River in summer 2011, which inundated the Fort Calhoun site, doing untold damage to underground structures, systems, and components, including safety-significant electrical cables, as well as pipes which carry radioactive materials (see photo, left):
"...Among the violations cited by regulators was the failure of a key electrical part during a 2010 test, a small electrical fire in June 2011, several security issues and deficiencies in flood planning that were discovered a year before the river spilled its banks.
Still to be addressed: the repair of flood damage at the facility; the replacement of fire-damaged equipment; strengthening the management of the plant; improving the safety culture among workers; the removal of the Teflon insulation; and the strengthening of heavy equipment supports...".
As Arnie Gundersen of Fairewinds is quoted, "If Fort Calhoun were being run by a business, it would have been shut down a year ago."