INES-event
INES 2

Temporary Loss of the seawater cooling systems

When performing recurrent inspection of the system for auxiliary cooling, eight valves were manually closed by mistake. This caused cooling capacity unavailability during six minutes in the component cooling system. This in turn caused safety system unavailability, i.e. containment spray, residual heat removal and diesel generators manual scram was initiated and one minute later cooling capacity re-established.
Justification of the Rating:
Part III-2.4.1 Table I.
Safety function availability: Inadequate, Initiator frequency: high, Basic rating 3. Part III.2.7 Additional factors. Downgrading due to time factors: INES 2.
Final Rating INES-2.

Location: BARSEBECK-2
Event date: Tue, 25-05-1999
Nuclear event report
Legenda & explanation