Science and Technology of Nuclear Installations

Research Article

Statistical Analysis of Loss of Offsite Power Events

Table 7

Plant-level LOOP frequencies assessed from GRS database.
ModeLOOP categoryNumber of eventsMean frequencyFrequency units
Critical operationPlant81/rcry
Critical operationSwitchyard2/rcry
Critical operationGrid16/rcry
Critical operationWeather3/rcry
Critical operationAll102/rcry
Shutdown operationPlant75/rsy
Shutdown operationSwitchyard1/rsy
Shutdown operationGrid9/rsy
Shutdown operationWeather3/rsy
Shutdown operationAll88/rsy