The document summarizes a catastrophic accident that occurred at the Sayano-Shushenskaya Hydroelectric Power Station in Russia in 2009. A sudden surge in water pressure caused turbine 2 to be ejected from its mounting, severely damaging turbines 7 and 9 as well. The accident resulted in the flooding of the powerhouse, an explosion in the transformers, and 76 deaths. It will take a long time and costly repairs to restore operations at the plant.

1. Accident at Russia’s Biggest Hydroelectric Sayano-Shushenskaya – 2009 August 17

6. Penstocks Spillway Powerhouse Dam Control Building 1 2 3 4 5 6 7 8 9 10 Units

9. General View

10. Penstocks Lines Spillway Powerhouse Transformers

12. The Accident – 2009 Aug 17

14. Before the Accident Power Units Sump Tank Air-Oil Tanks Governor Pumps Generators floor Crane

15. After the Accident Generator floor Air-Oil Tanks Sump Tank Crosshead – Unit 2 Colector Ring Unit 1 Unit 2 Floor

16. General View Floor

17. General View

18. Before the Accident Generator Runner Generator Rotor – Unit 5 The accident started here

19. Crosshead Sump Tank (turned) Air-Oil Tank

21. Unit 9: destroyed Unit 7: destroyed

22. Unit 9 Unit 7

23. The Powerhouse crane is above the assembly area

24. Generator Upper Bearing Generator rotor Destroyed column Enclosed Bus

25. The remains of the rotor spider

26. Water + Oil

27. Enclosed Bus

28. Assembly Area Smaller Runner Generator’s Poles Crosshead Crane Downstream crane rail

30. Transformer Roof Beams

32. Roof Roof

43. Unit 2 Units 7 and 9

44. Flood Flood

45. Seeking the victims Preliminary works

49. Situation on Saturday 2009 Aug 22

54. Aparently the water is already drained