Essay about 2009 Sayano–Shushenskaya power station accident case study

2795 Words Nov 14th, 2013 12 Pages
Sayano-shushenkaya Hydroelectric Power Station Disaster

1.Introduction

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.[3]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. [10]In addition, it was built strong enough to withstand earthquakes of up to 8 on Richter scale.

1.2.Regional Powerhouse Background[3]
RusHydro
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The water flood pits of nearby units causing further turbine failures. Electrical short circuits forced all units to emergency shut down along with in house power supply system.
Due to power failure ,plant’s automatic safety system failed to shut down Units 7 and 9, for which still operated at full speed ,in excess of 142rpm, triggering the crackling short circuits and explosion in their vicinity. Related scene had been captured into cell phone camera video. 3
2.4.People On The Scene
Water was washing away people form turbine gallery into the Yenisei river. Some of them were later caught and rescued, but unfortunately some were not. [3]The staff later learned that proper emergency exits didn’t exist. Water continued to pour into the hall, flooding lower levels and eventually submerged other Units. As the water lever rose, employees stampeded toward the main entrance. Fearing a total collapse of the dam ,many phoned relatives downstream and urged them to seek shelters. [4]Even among the fleeing workers were supervisors in charge of safety and emergencies, which added to the confusion and chaos. Others led employees to safety using cell phones as flashlights.

Except for Unit 5 gate, the remaining 8 units ‘s wicket and head gates could not be closed remotely. SSH chief

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