2009 Sayano–Shushenskaya power station accident case study
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Sayano-shushenkaya Hydroelectric Power Station Disaster
1.1.Brief Dam Description
Sayano-Shushenskaya Hydroelectric Power Station was biggest hydroelectric power station ever built in Russia history, and also the sixth biggest in the worth, which is located on the Yenisei River, near Sayanogorsk in Khakassia.The plant operated ten hydro turbines, made total 6,400 MW of output, average annual produced 23.5 TWH,which peaked in 2006 at 26.8TWH. Its arch gravity dam is 246 meters high ,1,066 meters long, and 110 meters of base width. In addition, it was built strong enough to withstand earthquakes of up to 8 on Richter scale.
1.2.Regional Powerhouse Background
RusHydro…show more content… The work had been toughened where no keys available for head gates control room, so metal doors had to be smashed.
2.5.After The Disaster
Within first hours after accident, the Ministry of Russian Federation for Civil Defense directed rescuers from across the country to SSH for finding and rescuing survivors.Withing 24 hours, more than 1500 rescue workers arrived and began working. Fourteen survivors were rescued the operation. Rescue teams also used special chemical by helicopters to congeal industrial oil spread to the river, and removed them from water afterwards. Environmental damage caused by these oil spills was minimized.
3.Root Cause Investigation
3.1.Unit 2 Turbine Defects
After accident, Russia’s Federal Service for Ecological,Technologica, and Nuclear Supervision (Rostekhnadzor) launched an investigation. Official report was released on Oct.3.
According to the report, Unit 2 started having problems shortly after its installation due to defects in its seals and shaft vibrations. The cavities and crack on the turbine wheel were completely reconditioned in 2000. Nevertheless, it continued to have problems and underwent further repairs in 2005 and 2009.
From January to March 2009, repairs were conducted and new automatic control system was installed as well. On March 16, the repaired turbine