accident at russia s biggest hydroelectric
TRANSCRIPT
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Accident at Russia’s Biggest Hydroelectric
Sayano-Shushenskaya – 2009 August 17
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1- Main Characteristics
Number of Units: 10
Turbine Type: Francis (16 blades)
Rated Power: 650 MW each
Rated Discharge per Unit: 358,5 m³/s
Nominal Speed: 142,86 rpm
Net Head: 194 m
Operation Date: 1978
Runner Weight: 156 ton
Runner Diameter: 6,77 m
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2 - Main CharacteristicsOne of the world's largest hydro-electric plants, its dam is
245 m (800 ft) high and stretches 1 km (0.6 miles)
across the Yenisei river.
Opened in 1978, the station provides a quarter of RusHydro output and is a major power supplier to at
least two smelters owned by United Company RUSAL,the world's largest aluminium producer.
The hydroelectric power station is located on the YeniseiRiver, near Sayanogorsk in Khakassia, Russia. Beforethe accident, it was the largest power plant in Russia andthe sixth-largest hydroelectric plant in the world.
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PenstocksSpillway
Powerhouse
Dam
Control
Building
12345678910Units
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Penstocks
Lines
Spillway
P o
w e r h o u s e
Transformers
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The Accident – 2009 Aug 17
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The accident
At 08:13 local time (00:13 GMT) on 17 August 2009, the station suffered acatastrophic "pressure surge" in turbine known as a water hammer. Thesudden water pressure surge resulted in the ejection of turbine 2 with allequipment, a total weight some 900 tons, from its seat.
Turbines 7 and 9 also suffered from severe damage, while the turbine roomroof fell on and damaged turbines 3, 4 and 5. Turbine 6, which was inscheduled repair at the time of accident, received only minor damage as itwas the only one of the station's 10 turbines that did not receive electricaldamage due to shorting of transformers, and it will be restarted as soon aspossible.
Water immediately flooded the engine and turbine rooms and caused atransformer explosion.
On 23 August 2009, authorities said 69 people were found dead while 6people are still listed as missing. Efforts to pump flood water from theengine room and complete a search for the missing workmen are expectedto take 3 to 8 days.
http://en.wikipedia.org/wiki/2009_Sayano%E2%80%93Shushenskaya_hydroelectric_power_station_accident
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Before the Accident
Power Units
Sump Tank
Air-Oil Tanks
Governor
PumpsGenerators floor
Crane
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Generator floor
After the Accident
Air-Oil Tanks
Sump Tank
Crosshead –
Unit 2
Colector Ring
Unit 1
Unit 2
Floor
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General View
Floor
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General View
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Before the Accident
Generator Runner
Generator Rotor – Unit 5
The accident started
here
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Unit 9: destroyed
Unit 7: destroyed
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Unit 9
Unit 7
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The Powerhouse crane is
above the assembly area
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Generator Upper
Bearing
Generator rotor
Destroyed column
Enclosed Bus
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The remains of the rotor spider
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Water + Oil
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Assembly Area
Smaller Runner
Generator’s Poles
Crosshead
Crane
Downstream crane rail
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Transformer Roof Beams
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Roof
Roof
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Consequences
76 people dead.
Question: By this number, maybethere was approx. 100 peoplein the Powerhouse. Normally,
even during maintenanceworks, there aren't so manypeople. Why was there somany people?
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Consequences
It will cost at least $310 million.
A long time to repair the damages.
The production of more than500,000 tons of aluminum will belost.
Oil slick is travelling down theriver.
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Consequences
•It is not clear how many peoplewere potentially affected by the
accident.
• The plant satisfied 10% of Siberia’s energy needs.
• Aluminum smelters consumedover 70% of the energy
generated by the power plant.
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Our main hypotheses about the sequence of the disaster:
(Attention: Preliminary hypotheses based only on the pictures)
Sudden closing of the Unit 2 wicket gates.
Heavy waterhammer in the spiral case and penstock, causing theircollapse.
Upward force, resulted from the waterhammer, destroying the civil
structure over the spiral case and penstock.
Pressure of the upstream water causing elevation of structures andpeaces.
Heavy reverse waterhammer (draft tube) causing elevation of the
turbine cover, shaft, etc.
Rapid flooding of the Powerhouse.
Units 7 and 9, without closing, in runaway speed with the generatorsinside the flood water.
1 - Causes
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Unit 2
Units 7
and 9
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FloodFlood
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Seeking the victims
Preliminary works
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Aparently thewater is already
drained
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Continuing the seeking of victims.
and
Finishing the cleaning of the debris.
Completing the drainage of the water.
Constructing a temporary roof (one week) and then a better one(two months or less) to protect against the winter (this will prevent
new photos…).
Recover the columns and beams supporting the rails of thePowerhouse Crane, to allow its use.
Some Next Steps
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News – August 21
NOVOSIBIRSK, August 21 (Itar-Tass) - The water level in the inundatedturbine room of Sayano-Shushenskaya hydropower plant where the waterpumping out was started on Thursday, decreased by 2 meters by Fridaymorning
A total of more than 30 thousand cubic meters of water have been pumpedout. It is necessary to pump out a total of 250 thousand cubic meters of water.
Minister Sergei Shoigu earlier set the task to install additional pumps and
thereby increase the volume of pumped out water to 4 thousand cubicmeters per hour. “By increasing the capacity we will fulfill this task (waterpumping out) in 32 hours,” the minister said.
Thirteen pumps have been put into operation in the water pumping efforts at
the plant. The debris clearing operation continues. According to latestreports, 4,650 cubic meters of reinforced concrete structures have beenmoved out from the hydroelectric station.
At present, about 2 thousand people and 116 machinery units are engagedin the Sayano-Shusehnskaya HPP catastrophe liquidation efforts.
http://itar-tass.com/eng/level2.html?NewsID=14255520&PageNum=0
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Some References
http://www.dailymail.co.uk/news/worldnews/article-1207093/Accident-
Russias-biggest-hydroelectric-plant-leaves-seven-workers-dead.html
http://www.newsdaily.com/stories/tre57h1qb-us-russia-dam/
http://news.bbc.co.uk/2/hi/europe/8204860.stm
http://englishrussia.com/?p=4853
http:// www.1tv.ru