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Three mile island meltdown

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by

Halen Thomas

on 18 May 2011

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Transcript of Three mile island meltdown

Three Mile Island Meltdown The accident happened around 4 am on March 28 1979. Where:
The Three Mile Island power station is near Harrisburg, Pennsylvania. Three Mile Island nuclear power plant a cooling malfunction caused part of the core to melt in the #2 reactor. This caused the temperature in the primary coolant to rise which automatically shut down the reactor. A relief valve failed to close, so much of the coolant drained away that the reactor core was not removed and suffered severe damage. Within seconds of the shut down the pilot-operated relief valve (PORV) on the cooling system opened like it was supposed to. About 10 seconds later it should have closed but it didn’t leaking vital cooling water to the coolant drain tank. The operators thought it had closed because the instruments showed them that a “closed” signal was sent to the valve they didn’t have instruments to show that it was actually open. This accident was the most serious U.S commercial nuclear power plant operating in history, even though no deaths or injuries had occurred. It did however change involving emergency response planning, reactor operating training, radiation protection, and many other areas of nuclear power plant operations. Unit 1 commercial operation date was September 2, 1974,
unit 2 December 2, 1978. The units are capable of generating enough
electricity to power over 800,000 American homes. The Chernobyl disaster was on April 26 of 1986 at the Chernobyl nuclear power plant in the Ukraine. An explosion and fire released large amounts of radiation in to the air, which spread over much of western Russia and Europe. It is considered the worst nuclear power plant accident in history and is classified as one of the two level 7 event on the international nuclear scale the other being the Fukushima nuclear incident which is considered far less serious and has caused no direct deaths. Fewer than 50 deaths had been directly caused by the radiation from the disaster, almost all being highly exposed rescue workers, many died within months of the accident but others as late as 2004. Work cited:
"Three Mile Island | TMI 2 |Three Mile Island Accident." World Nuclear Association | Nuclear Power - a Sustainable Energy Resource. Web. 26 Apr. 2011. <http://www.world-nuclear.org/info/inf36.html>.
"Japan Earthquake and Tsunami: Fukushima Nulear Plant Radiation Leak Could Kill People | Mail Online." Home | Mail Online. Web. 26 Apr. 2011. <http://www.dailymail.co.uk/news/article-1367684/Japan-earthquake-tsunami-Fukushima-nulear-plant-radiation-leak-kill-people.html>.
"Chernobyl Disaster." Wikipedia, the Free Encyclopedia. Web. 26 Apr. 2011. <http://en.wikipedia.org/wiki/Chernobyl_disaster>.
<http://en.wikipedia.org/wiki/Three_Mile_Island_Nuclear_Generating_Station>. Nuclear meltdown due to losses in cooling functions, after the coolant systems at Fukushima Daiichi went down, Japan declared an emergency at a second plant in Onagawa where excessive radiation levels were recorded. After the recent disaster in Japan it is reportedly on par with the Three Mile Island accident in Pennsylvania in 1979. Only the Nuclear explosion at Chernobyl in 1986 has topped the scale The Japanese nuclear safety agency rated the damage at a nuclear power plant at Fukushima at a four on a scale of one to seven, which is not quite as bad as the Three Mile Island accident in the United States in 1979, which registered a five.The Chernobyl explosion in the Ukraine in 1986, the worst nuclear power accident ever, was rated a seven. That was the only event classified as a major accident in nuclear power history, exploded due to an uncontrolled power surge that damaged the reactor core, releasing a radioactive cloud that blanketed Europe.
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