Unit 2

Ukraine / Kyyivska / Prypyat /
 nuclear reactor, 1979_construction
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Reactor type: RBMK-1000
Electrical power: 1000 MW
Construction start: February 1, 1973
Connected to the grid: December 21, 1978
Commissioned: May 28, 1979
Decommissioned: October 11, 1991

On October 11, 1991, during the reduction of turbine generator speed at Unit 2 for maintenance, an accident occurred due to a cable insulation failure. This led to unauthorized voltage being applied to the nearly stopped generator, causing it to enter an unplanned "motor" mode. This resulted in significant vibration, bearing and sealing system failure, and a hydrogen and oil fire in the generator bearing area. The reactor was shut down, and a fire broke out in the turbine hall, leading to roof collapse and equipment damage. The fire was extinguished by 2:20 AM on October 12, but turbine generator No. 4 was severely damaged.

The accident caused a loss of 180 tons of turbine oil, 500 m³ of hydrogen, and a roof collapse of 2,448 m². The radioactive aerosol release was 3.6×10 Ki, and the total release during the incident was 1.4×10 Ki, within the allowable limit. There were no radiation exposures above control levels for personnel or the public. 63 emergency responders received doses between 0.02 and 0.17 Sv. Despite significant system failures, the reactor remained in a controlled state.

Subsequent repair and recovery efforts were planned but not fully implemented due to the eventual decision to shut down the Chernobyl NPP.
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Wikipedia article: http://en.wikipedia.org/wiki/Chernobyl_accident
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Coordinates:   51°23'21"N   30°6'16"E

Comments

  • Two fires in three years at the same nuclear plant? Horrendous. At least this one was contained and didn't cause a meltdown like the saddening events at Reactor 4 in 1989...
  • My mistake, 1986 I meant not 1989. Doh!
  • You mean that it didn't cause a meltdown that you know of.
  • if the accident would have ocurred here, in reactor 1 or 2 all what happened wouldn't happen anyway pripyat would be not abandoned
  • Tere bhan di ghand.
  • There was a fire in the turbine hall not in reactor, 180 tons of turbine oil and about 500 cubical meters of hydrogen had burned out but reactor was in safe untouched by fire.
  • fedel+kpo actually units 3 and 4 and 5 and 6 (never finished) were 2nd gen and 1 and 2 were 1st gen if had happened in a 1st gen unit meaning blocks 1 or 2 it would have been EVEN WORSE believe it or not
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