NRC CAL – NOV (White)

On February 19, 2009, Duke Power Company, LLC was issued a White Significance Determination Finding which involved the performance of a maintenance procedure that was inadequate. Specifically, the maintenance procedure failed to identify and electrically isolate all main generator automatic voltage regulator trip outputs to the main generator lockout relay. This deficiency caused a main generator lockout which resulted in a loss of power event to the site which ultimately led to a loss of reactor coolant inventory while the reactor was shutdown.