INES-event
INES 0

LOSS OF AC POWER DURING REFUELING WITH UNLOADED REACTOR

The plant was shut down and the fuel unloaded from the reactor and stored in the fuel pool. During tests of electrical equipments the only available offsite power supply was lost. Because the two available on-site diesel generator sets have to be started manually a total loss of AC power occurred. After 4.5 minutes offsite power supply was restored.
Basis for rating: According User Manual Section III.3.1.2
- Large water inventory in fuel pool gives enough time for corrective actions
- power supply restored in 4,5 minutes
- two diesel generator sets were available, which gives minor degradation of fuel pool cooling + level 0

Location: BEZNAU-2
Event date: Fri, 10-04-1992
Nuclear event report
Legenda & explanation