Reward also given to them who dares to voice out their finding on safety issues, which proved to be helpful. They were used to those high levels of vibration and choose to ignore them. The technology has been well established for a century or more, there are few toxic substances or chemicals involved, pollution and other environmental problems are at a minimum, and all in all, hydropower is a pretty benign enterprise.
It is likely, therefore, that the head cover would not have lifted during operation even if the studs carried no load at all. The evidence from the photographs and video recorded sounds suggests that Units 7 and 9 were similarly forced upwards, but with less violence than in the case of Unit 2.
It was also found that at the moment of accident at least six nuts were missing from the bolts securing the turbine cover. In this case, the plant operators were clearly under pressure from the owners and grid operators to improve system frequency stability, and, therefore, load following capability.
In Marcha complete overhaul on turbine 2 was performed where cavities of 12 mm in depth and cracks up to mm in length found and repaired. Fortunately, they did not, due to adequate field testing and implementation of results. Although the rough operating zones of the Sayano Shushenskaya turbines were able to be identified in the laboratory, the problem of resonance in the penstocks as excited by draft tube pulsations at overload conditions could only be identified in the field under full scale operating conditions.
Moreover, wicket gates are usually designed to drift closed but not to slam upon complete loss of oil pressure. Rescue teams also used special chemical by helicopters to congeal industrial oil spread to the river, and removed them from water afterwards.
Judging from the photographs of the damaged machine after the pit was dewatered Figure 9the head cover flange was undistorted.
This compares with the machine weight of tonnes exerted downward. If the operation records can be reconstructed, we can eventually discover the cause of the fatal water hammer—whether it was a design flaw, an operator mistake, or a combination.
Kolesnikov  expanded on the Rostekhnadzor conclusions somewhat. As the water lever rose, employees stampeded toward the main entrance.
During operation, there would also be the significant hydraulic thrust downward on the runner tonneswhich would have been supported by the head cover. In the absence of any stud failure at Units 7 and 9, it is very difficult to envision what could have caused the damage that is clearly visible in the photographs Figures 10, 11, and Assuming the parts of the machine that were lifted weighed tonnes, this pressure spike could have lifted the machine a meter and a quarter during the tenth of a second duration.Consider how the human element affected the disaster that occurred at the Sayano–Shushenskaya hydroelectric power station in Khakassia, Russia, on August 17, First there was a loud bang from one of the operating turbines (Turbine 2).
ultimedescente.com - Download as PDF File .pdf), Text File .txt) or read online. RusHydro, the plant's owner and operator, was the second-largest hydropower producer in the world, with 25, MW of capacity. Sayano-Shushenskaya accounted for a quarter of that output. Before the accident, Sayano-Shushenskaya was the largest hydropower plant in Russia and the sixth largest in the world.
Rescue workers clear debris and search for victims near the wreckage of Sayano-Shushenskaya hydroelectric dam's Turbine 2. The ton piece of equipment exploded out of its seating and flew 50 feet in the air on Aug. A view from the dam of the Sayano-Shushenskaya hydroelectric power station on the Yenisei River, where a turbine failure killed 75 people and crippled the facility, leaving hundreds of thousands of people without power.
Aug 24, · But on Aug. 17, a week ago today, Russia's largest hydropower facility, the Sayano-Shushenskaya plant in Siberia, experienced a massive explosion and flood that at last report killed at least 69 people, knocked out the entire facility, and sent an oil slick down river for miles.Download