Statistical Analysis of Loss of Offsite Power Events

Table 6

Plant-level LOOP frequencies assessed from IRSN database.

Mode	LOOP category	Number of events	Mean frequency	Frequency units
Critical operation	Plant	110		/rcry
Critical operation	Switchyard	26		/rcry
Critical operation	Grid	3		/rcry
Critical operation	Weather	6		/rcry
Critical operation	All	145		/rcry
Shutdown operation	Plant	71		/rsy
Shutdown operation	Switchyard	11		/rsy
Shutdown operation	Grid	1		/rsy
Shutdown operation	Weather	0		/rsy
Shutdown operation	All	83		/rsy