1、The Chernobyl disaster was a nuclear accident that occurred on 26 April 1986 at the Chernobyl Nuclear Power Plant in the USSR. （蘇維埃社會主義共和國聯盟）It is considered the worst nuclear power plant accident in history, and it is the only one classified（被分類的） as a level 7 event on the International Nuclear Eve

2、nt Scale.（規模） The Chernobyl（切爾諾貝利） Nuclear AccidentMain CausesOperating（運轉）（運轉） instructions and design deficiencies（不足）（不足） Operator error（失誤）（失誤） initially（最初（最初的）的） faulted The reactor had a dangerously large positive void（無效的）coefficient（系數）. A more significant flaw（缺點） was in the design of the

3、control rods（權） 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 of events that le

4、d to the crisis.（危機） The leakage（泄露） radiation（輻射） dust with air blowing into the western region of Soviet（蘇維埃） Union, Eastern Europe and The Nordic Scandinavian（北歐斯堪納威亞半島） Peninsula. Ukraine, Belarus and Russia are the Most polluted.Pollution scalesAftermath1)International spread of radioactive sub

5、stances2)Radioactive release3)Health of plant workers and local people4)Residual radioactivity in the environmentMap 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 surrounding 20-mile rad

6、ius（半徑）, 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 now, the malformation fe

7、tus (畸形兒) still birth due to the long-term effects of radioactive material.The accident area is still contaminated（污染） and uninhabitable（杳無人跡的）. The once prosperous（繁榮的） city has become a “ghost city”Actions April 26, 1986, over 8 tons leakage of strong radiation. Unit 4 was 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