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Additional info for Fires in Nuclear Powerplants - Lessons Learned (IAEA TECDOC-1421)
Example text
The following direct causes could be identified for the event: — — Short to ground at the MCP motor due to a tool forgotten chisel by a worker, MCP failure due to short circuit because of the missing automatic ground fault protection. However, The ground fault at the MCP motor is not of high significance, because only few equipment was affected and in case of an electrical detection of this ground short the event would have stopped without any fire occurring and without any consequences. The loss of MCP by short circuit is also not safety significant as it is considered in the plant design.
The fire was not safety significant. Furthermore, preventive measures against a repetition were easily possible (BWR, 1988). 44 A typical fire in the electronic equipment was observed when an electronic element (condensator of an electronic element for the reactor power I&C) started to smoulder (PWR, 1989). The small fire was detected by the automatic fire detection system, further electronic equipment in the close vicinity of the burning one were damaged by smoke and heat. There were no further consequences, the event was of low significance.
The fire self-extinguished. There were no consequences on the reactor safety. A short circuit in a 220kV/380kV high voltage system which resulting in a fire at the equipment has to be mentioned as another fire event of electric cause (PWR, 1988, see [5]) but also igniting lubrication oil. The turbine was stopped and the reactor had to be shut down, the emergency diesels were started, the residual heat had to be removed via the secondary relief valves. The fire itself was automatically detected and extinguished itself within a short time period.