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1、,Make peace with the planet.,The Chernobyl disaster was a nuclear accident that occurred on 26 April 1986 at the Chernobyl Nuclear Power Plant in the USSR. （苏维埃社会主义共和国联盟）It is considered the worst nuclear power plant accident in history, and it is the only one classified（被分类的） as a level 7 event on
2、the International Nuclear Event Scale.（规模）,The Chernobyl（切尔诺贝利） Nuclear Accident,Main Causes,Operating（运转） instructions and design deficiencies（不足）,Operator error（失误） initially（最初的） faulted, The reactor had a dangerously large positive void（无效的）coefficient（系数）., A more significant flaw（缺点） was in th
3、e design of the control rods（权） that are inserted into the reactor to slow down the reaction.,The developers of the reactor plant considered this combination of events to be impossible and therefore did not allow for the creation of emergency protection systems capable of preventing the combination
4、of events that led to the crisis.（危机）,The leakage（泄露） radiation（辐射） dust with air blowing into the western region of Soviet（苏维埃） Union, Eastern Europe and The Nordic Scandinavian（北欧斯堪纳威亚半岛） Peninsula. Ukraine, Belarus and Russia are the Most polluted.,Pollution scales,Aftermath,1)International sprea
5、d of radioactive substances2)Radioactive release3)Health of plant workers and local people4)Residual radioactivity in the environment,Map of radiation levels in 1996 around Chernobyl.,The Chernobyl accident killed more than 30 people immediately, and as a result of the high radiation levels in the s
6、urrounding 20-mile radius（半径）, 135,000 people had to be evacuated（疏散）. In 2006, The Other Report On Chernobyl pointed out there are about 4000 people will die from the excessive radiation.,The resultant release of radioactivity threatens many thousands of people all over Europe with cancer. Up to no
7、w, the malformation fetus (畸形儿) still birth due to the long-term effects of radioactive material.,The accident area is still contaminated（污染） and uninhabitable（杳无人迹的）.,The once prosperous（繁荣的） city has become a “ghost city”,Actions,April 26, 1986, over 8 tons leakage of strong radiation. Unit 4 was
8、subsequently reinforced concrete seal, the name sarcophagus（石棺）,Sarcophagus has been in use for nearly 25 years, now it has been the appearance of cracks. Ukraine hopes in the sarcophagus on the installation of a 100-meter high steel arch,石棺“已使用了近25年，现在它已经出现裂缝，乌克兰希望在”石棺“上安装高100米的钢拱。,Make peace with the planet.,Thanks!,
