INES-event
INES 1

INES-rating due to earlier event at Forsmark 1 - Two emergency DG did not start when the unit was disconnected from the ordinary off-site grid

Due to identical design and construction of the safety trains between Forsmark unit 1 and Forsmark unit 2, in particular the set points in the uninterrupted power supply systems and power supply to the speed measurement device on the diesel generators, the inverters and rectifiers of the UPS have been modified and the power supply of the speed measurement device on all diesel generators have been changed.

For further details on the actual occurred event please read the previously reported INES-event at Forsmark unit 1 "Two emergency diesel generators did not start when the unit was disconnected from the ordinary off site grid".

The event of July the 25th at Forsmark 1 has been rated INES 2. Since there was no initiating event at Forsmark 2 the rating has accordingly been determined to INES rating 1.

Location: FORSMARK-2
Event date: Tue, 25-07-2006
Nuclear event report
Legenda & explanation