INES-event
INES 2

One of the emergency core cooling systems - the core spray system - was unavailable at Oskarshamn-2

During periodic testing on 13 November 1996 it was recognised that the core spray pumps were disconnected. The failure was remedied in ten minutes. Two weeks earlier, prior to start up after refuelling, all systems were checked and found o.k.. However, later an additional test was performed when the disconnectors to the pumps were opened and remained so until the first periodic test.
Rating:
Degradation of defence in depth without an initiator (INES users' manual page 28, Table 1)
Safety function availability: inadequate
Initiator frequency/initiator probability: low/unlikely (major LOCA, page 52)
Basic level: 1, additional factor: procedural inadequacy (page 38), final rating: level 2

Location: OSKARSHAMN-2
Event date: Fri, 01-11-1996
Nuclear event report
Legenda & explanation