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Additional resources for Fires in Nuclear Powerplants - Lessons Learned (IAEA TECDOC-1421)

Example text

The significance of the event therefore was low. Another arcing event resulting in a fire occurred during a regular in-service inspection of a 380V switchgear (1989, PWR). The small smouldering fire was directly signalled by the automatic fire detection system and immediately extinguished by on-site first aid fire fighters. The relevance of the event was low. 45 Only very few single fire events resulting from other than the above mentioned causes and/or affecting different equipment can be mentioned from the experience of reportable fire events at NPP in Germany.

For some time they succeeded to restore High Pressure Injection Pump 1APN-1 and the Service Water Pump. m. the personnel initiated the fire extinguishing in the cable compartments. Further attempts to use the foam fire extinguishers from the local control panels were unsuccessful. To the time of the fire brigade arrival the cable compartments 59a, switchgear 6/04kW, the cable compartment under the Main Control Room 1 were filled with smoke. m the electric shop personnel undertook actions to displace the hydrogen (dehydrogenises) from the turbine generators TG-1 and TG-2.

CONCLUSIONS The available data on fire events reported to the authorities from NPP in Germany give the result the amount of safety significant fire events is low. Nevertheless, several of the fire which occurred up to now at German NPP could have the potential under other boundary conditions to influence nuclear safety. However, it should be underlined that the necessary database still has to be improved and to be expanded for several fire protection features. Moreover, the influence of human actions is to be taken carefully in consideration.

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Fires in Nuclear Powerplants - Lessons Learned (IAEA TECDOC-1421)


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