MOSCOW, Russia, 10/26/11 (PennWell) -- RusHydro announced it completed construction of an onshore spillway at the 6,400-MW Sayano-Shushenskaya hydroelectric project in the Russian Far East.
The onshore spillway, in addition to the project's existing dam spillway, was initiated in 2005 to increase the reliability and safety of power plant structures during periods of extreme floods. It is designed to allow flows of up to 4,000 cms.
A 2009 accident at the plant, on the Yenisei River in the remote region of Khakassia, flooded the powerhouse, damaging equipment and killing 75 people.
Commissioning of the spillway was preceded by pre-operational tests of the facility from September 28-October 1. Tests included step-by-step opening of segmental gates at the inlet crown until fully opened 9.5 meters, enabling water to pass through spillway elements including two tunnels and a tailrace.
In September, Russian equipment manufacturer Power Machines shipped a second consignment, including three sets of 145-ton turbine runners, generator bearing oil baths, and a 13-ton rotor frame, for rehabilitation of Sayano-Shushenskaya.