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

Sample text

The local feature of ANPP is the seismicity of magnitude 8 on MSK-64 scale. The ANPP Unit 1 was put into commercial operation in December 22, 1976, and Unit 2 - January 5, 1980. 5 MW (e). The main building of the ANPP includes: two reactor blocks with six steam generators and all auxiliary equipment, the turbine hall with 4 turbine generators located abreast (2 turbine generators for each unit), the cable tunnels, the switch board rooms, two main control rooms (MCR-1, MCR-2) in order to operate each unit separately and the central control room for measuring and monitoring the switchgear units (metering, signaling and alarms).

P. Berg Bundesamt für Strahlenschutz (BfS), Salzgitter, Germany Abstract. The operating experience from nuclear power plants (NPP) in Germany reveals only very few reportable fire events. However, the equipment affected as well as the plant locations, where these fire events occurred are typical and representative in comparison to the fires which occurred at NPP in other countries. Up to the time being, there was no severe fire reported from any NPP in Germany, none of the fire events reported to the German authorities was reportable to INES or IRS.

Another type of lubrication oil fire occurred at one of the most recent PWR-type reactor units in 1990. The bearing of a fan for the NH4-stripping system of the waste water system had been overheated. Due to the overheating of the bearing the wheel of the fan motor could not work anymore and the lubrication at the motor ignited at the hot component. The fire became visible by smoke and was detected by the automatic fire detection system and successfully extinguished by the on-site shift first aid team within a very short time period.

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