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

Example text

Dubasov. 3. m. the engine-operator of Main Control Room -1 was ordered to start the service water pumps 2 NTV- 4 to the bus 6kW 1RB-2. There are 7 service water pumps at the ANPP. The 2 NTV- 4 service water pump is the reserve one and is to be connected to the corresponding vital bus 6 Kw during maintenance of any service water pumps of the unit 1 or unit 2 (look at fig. 1). 2NTV-4 service water pump was started from the Main Control Room -1 by the control switch. Having switched for the first time and noticing that the pump didn’t started, he made several attempts to start 2NTV-4 using the control switch.

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. Another short circuit induced pilot fire caused the failure of an emergency feedwater pressuriser valve in the turbine hall. Due to an electric fault the valve motor continuously closed the valve and overheated resulting in a small fire which was detected by the automatic fire detection system.

42 41. Characterise the extension of the fire (flames, hot gases): ‰ none ‰ part of a room ‰ 1 complete room ‰ more than 1 room (inside one fire cell or one fire compartment) ‰ between 2 (or more) fire cells ‰ between 2 (or more) fire compartments 30 30 42. : 43. : 44. : 45. : 46. : 47. : 48. If fire extended between 2 fire cells or 2 fire compartments due to failures in the fire barriers, specify the type of barrier concerned: ‰ 01 wall ‰ 02 ceiling ‰ 03 floor ‰ 04 damper ‰ 05 penetration closure device ‰ 06 door ‰ 07 none ‰ 08 other 49.

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


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