04/05/2010 UCS petitioned the NRC to require the owner of the Davis-Besse reactor to demonstrate how it would comply in the future with explicit terms of the operating license to shut down the reactor within six hours after reactor pressure. Download the pdf (819 kB)
03/12/2010 Workers discovered through-wall cracks in metal nozzles for control rod drive mechanisms in a replacement reactor vessel head. These cracks leaked because workers did not properly account for peak temperatures inside the vessel.
01/08/2008 UCS explained a weld leak discovered on a cooling water line during refueling. Download the pdf
06/18/2007 UCS met with the NRC regarding our petition seeking sanctions against FirstEnergy for the report the company submitted for an insurance claim that totally contradicted the information the company provided NRC on the cause of the reactor vessel head damage. Download the pdf
04/30/2007 UCS petitioned the NRC to sanction FirstEnergy regarding a report the company submitted for an insurance claim that totally contradicted the information the company provided NRC on the cause of the reactor vessel head damage. Download the pdf
09/18/2006 UCS documented the factors leading to the year-plus reactor outage that begin in February 2002 in this case study for our Walking a Nuclear Tightrope report. See details | Download the pdf
09/18/2006 UCS documented the factors leading to the year-plus reactor outage that begin in June 1985 in this case study for our Walking a Nuclear Tightrope report. See details | Download the pdf
01/26/2006 UCS rebutted NRC's charges that Andrew Siemaszko misled FirstEnergy and the NRC about the reactor vessel head cleaning conducted at Davis-Besse during its refueling outage in spring of 2000. See details
06/09/2005 UCS revisited the 20th anniversary of the loss-of-feedwater event that occurred at Davis-Besse on this date in 1985 by explaining what happened then and pointing out the ineffective steps taken to prevent future safety problems. Download the pdf
03/03/2003 UCS revisted the first anniversary of the discovery of the hole in the reactor vessel lid with a retrospective report detailing the chronology of failures leading to this near-miss. See details
08/05/2002 UCS and the Nuclear Information and Resource Service (NIRS) documented how the NRC first identified that Davis-Besse violated key safety regulations and then ignored those violations in allowing the reactor to continue operating. See details
03/2002 Fission Stories #131 chronicled the history behind the severely damaged reactor vessel head. So many opportunities existed for so many years by so many people that it’s hard to understand how they all failed.