INES-event
INES 2

Closed valves in the containment spray pumps' suction lines during the non-nuclear phase of start-up after refueling

During start-up procedures while the reactor temperaturewere still far below operational values it was detected that the valves at the containment spray pumps' suction were closed in contrary with their required open position. The testing instructions were not clear. A similar event occurred recently at unit 2.

Location: RINGHALS-4
Event date: Sat, 27-09-1997
Nuclear event report
Legenda & explanation