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Chernobyl Disaster
Transcript
On April 26, 1986, A major accident occurred at unit 4 nuclear plant in Chernobyl, Ukraine. The operating crew were planning to test whether the turbines could produce enough energy to keep the coolant pumps running in the event of no power until the emergency diesel generator was activated.
To prevent any interruptions to the power of the reactor, the safety systems were deliberately switched off. To conduct the test, the reactor had to be powered down to 25 percent of its capacity. This procedure did not go according to plan and the reactor power level fell to less than 1 percent. The power therefore had to be slowly increased. But 30 seconds after the start of the test, there was an unexpected power surge. The reactor's emergency shut down ,which should have halted a chain reaction, failed.
The reactor's fuel elements ruptured and there was a violent explosion. The 1000 tonne sealing cap on the reactor building was blown off. At temperatures of over 2000°C, the fuel rods melted. The graphite covering of the reactor then ignited. The graphite burned for nine days, churning huge quantities of radiation into the environment. Radioactive debris was buried at some 800 temporary sites,and later in the year the radioactive reactor was enclosed in a concrete and steel sarcophagus (which was later deemed unsound.) Within three months of the accident, 32 operators and firemen died, and also another result of this accident, some long term effects such as cancers and deformities have been reported. This disaster cost an estimated $15 billion in direct loss and it's estimated that the damages could accumulate to €235 billion for Ukraine and €201 billion for Belarus in the thirty years following the accident.
Article by:
Charessa Paulette Robinson
Sourses:
"Chernobyl Ventilation Stack Removed." Chernobyl. N.p., n.d. Web. 26 Jan. 2014.
"Backgrounder on Chernobyl Nuclear Power Plant Accident." NRC:. N.p., n.d. Web. 25 Jan. 2014.
"The Chernobyl Disaster: 25 Years Ago." The Atlantic. Atlantic Media Company, 23 Mar. 2011. Web. 27 Jan. 2014.
Lallanilla, By Marc. "Chernobyl: Facts About the Nuclear Disaster." LiveScience. TechMedia Network, 25 Sept. 2013. Web. 25 Jan. 2014.
"Fukushima Vs. Three Mile Island Vs. Chernobyl." Forbes. Forbes Magazine, n.d. Web. 27 Jan. 2014.
Calhoun County Print:
April 26 ,1986
Disaster At Chernobyl!
Chernobyl Nuclear plant
Chernobyl was the result of both human error and mechanical malfunction.
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