A fire ignited in switchgear building. It resulted in a loss of off-site power and reactor scram. All four diesel generators started as planned and all safety features functioned normally. The unit was 8.5 hours without off-site power. The event did not cause any radiation doses or radioactive releases. BASIS FOR RATING: Initiator: A long-term loss of off-site power caused by a fire(possible). Safety function availability: Full. Table A2: A2 -1. Level 2 is more appropriate because the event leadsto the re-evaluation of safty provisions. DIFFICULTIES IN RATING: