Statistical Analysis of Loss of Offsite Power Events

Table 8

Plant-level LOOP frequencies assessed from US NRC database.

Mode	LOOP category	Number of events	Mean frequency	Frequency units
Critical operation	Plant	14		/rcry
Critical operation	Switchyard	42		/rcry
Critical operation	Grid	7		/rcry
Critical operation	Weather	12		/rcry
Critical operation	All	75		/rcry
Shutdown operation	Plant	13		/rsy
Shutdown operation	Switchyard	23		/rsy
Shutdown operation	Grid	4		/rsy
Shutdown operation	Weather	5		/rsy
Shutdown operation	All	45		/rsy