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Chernobyl - School Essays

Chernobyl


The nuclear power plant accident on April 26, 1986 in the former Soviet Union demonstrated for the first time that the effects of any nuclear accident are not localized, but rather spill over into neighboring countries and have global consequences. The accident harmed a lot of people in many ways and took years to clean up.
The power plant ran most of Ukraine’s power. The board of director of the plant wanted to run a test that would tell them whether or not the power plant could run on low power in case of a malfunction of the reactor. The plan went into effect and when Reactor 4 was on shutdown for routine maintenance on April 25, 1986 it was decided to run the test at this ...

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fell to about 30 MW where the positive void coefficient became a problem. The operators tried to raise the power by freeing all the control rods manually and at 01:00 hr. on April 26 the reactor stabilized at 200 MW. Within a short time, an increase in coolant flow and a drop in steam pressure required the operators to withdraw nearly all the rods. The reactor became very unstable and the operators had to make adjustments every few seconds to maintain a constant power. By this time, the operators reduced the flow of feedwater to maintain the steam pressure. Also, pumps that were powered by the slowing turbine provided less and less cooling to the reactor. This created additional steam in the cooling channels and the operators could not control a power surge estimated to 100 times the normal power. The sudden increase in temperature caused part of the fuel to rupture; fuel particles then reacted with the water creating a steam explosion, which destroyed the reactor core. A ...

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PAPER DETAILS
Added: 4/30/2005 07:31:33 AM
Category: World History
Type: Premium Paper
Words: 1037
Pages: 4

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