The accident occurred on 17 August 2009 at 08:13 local time (00:13 GMT).[5] There was a loud bang from turbine 2. The turbine cover shot up and the 920-tonne (910-long-ton; 1,010-short-ton) rotor then shot out of its seat.[4] After this, water spouted from the cavity of the turbine into the machinery hall.[6] As a result, the machinery hall and rooms below its level were flooded.[6] At the same time, an alarm was received at the power station's main control panel, and the power output fell to zero, resulting in a local blackout. The steel gates to the water intake pipes of the turbines, weighing 150 tonnes (150 long tons; 170 short tons) each, were closed manually by opening the valves of hydraulic jacks keeping them up[2][4] between 8:35 [2] and 9:20 hours[7] (9.30 by official report[2]). The operation took 25 minutes, which is near the minimum time (highest speed) allowed for this operation.[8] The emergency diesel generator was started at 11:32.[6] At 11:50, the opening of 11 spillway gates of the dam was started and was finished at 13:07.[7] 75 people were later found dead.[9]
Nine out of the ten turbines were operating at the time, with a total output 4,400 MW.[6] Turbine № 6 was undergoing scheduled maintenance, but was ready for a restart.[10]
Oleg Myakishev, a survivor of the accident, described it as follows:
The accident occurred on 17 August 2009 at 08:13 local time (00:13 GMT).[5] There was a loud bang from turbine 2. The turbine cover shot up and the 920-tonne (910-long-ton; 1,010-short-ton) rotor then shot out of its seat.[4] After this, water spouted from the cavity of the turbine into the machinery hall.[6] As a result, the machinery hall and rooms below its level were flooded.[6] At the same time, an alarm was received at the power station's main control panel, and the power output fell to zero, resulting in a local blackout. The steel gates to the water intake pipes of the turbines, weighing 150 tonnes (150 long tons; 170 short tons) each, were closed manually by opening the valves of hydraulic jacks keeping them up[2][4] between 8:35 [2] and 9:20 hours[7] (9.30 by official report[2]). The operation took 25 minutes, which is near the minimum time (highest speed) allowed for this operation.[8] The emergency diesel generator was started at 11:32.[6] At 11:50, the opening of 11 spillway gates of the dam was started and was finished at 13:07.[7] 75 people were later found dead.[9]Nine out of the ten turbines were operating at the time, with a total output 4,400 MW.[6] Turbine № 6 was undergoing scheduled maintenance, but was ready for a restart.[10]Oleg Myakishev, a survivor of the accident, described it as follows:
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