Loss Of Offsite Power
The availability of ac power to commercial nuclear power plants is essential for safe operations and accident recovery. A loss of offsite power (LOOP) event, therefore, is an important contributor to total risk at nuclear power plants. In 1988, the NRC published NUREG-1032 to report on an evaluation of the risk from actual LOOP events that had occurred at nuclear power plants within the United States up through 1985. NUREG/CR-5496 documents a similar study whose primary objective was to update the LOOP model parameters, frequency, and recovery time, using plant event data from 1980 - 1996. An additional objective was to re-examine the engineering insights concerning LOOP events. These studies were followed by NUREG/CR-6890 which evaluated data from 1986 through 2004. The update studies provided here represent annual updates to NUREG/CR-6890.
Current Results:
Supporting Information:
Historical Results:
- Loss of Offsite Power (LOOP) 2021 Summary Update
- Loss of Offsite Power (LOOP) 2020 Summary Update
- Loss of Offsite Power (LOOP) 2019 Summary Update
- Loss of Offsite Power (LOOP) 2018 Summary Update
- Loss of Offsite Power (LOOP) 2017 Summary Update
- Loss of Offsite Power (LOOP) 2016 Summary Update, Rev. 1
- Loss of Offsite Power (LOOP) 2015 Summary Update
- Loss of Offsite Power (LOOP) 2014 Summary Update
- Loss of Offsite Power (LOOP) 2013 Summary Update
- Loss of Offsite Power (LOOP) 2012 Summary Update
- Loss of Offsite Power (LOOP) 2011 Summary Update
- Loss of Offsite Power (LOOP) 2010 Summary Update
- Loss of Offsite Power (LOOP) 2009 Summary Update
- Loss of Offsite Power (LOOP) 2008 Summary Update
- Loss of Offsite Power (LOOP) 2007 Summary Update
- Loss of Offsite Power (LOOP) 2004 Summary Update
- "Reevaluation of Station Blackout Risk at Nuclear Power Plants" (NUREG/CR-6890)
- "Evaluation of Loss of Offsite Power Events at Nuclear Power Plants: 1980 - 1996"
(NUREG/CR-5496)
Page Last Reviewed/Updated Monday, March 25, 2024