切爾諾貝利核輻射英語(yǔ)演講第1頁(yè)/共14頁(yè)TheChernobyldisasterwasanuclearaccidentthatoccurredon26April1986attheChernobylNuclearPowerPlantintheUSSR.（蘇維埃社會(huì)主義共和國(guó)聯(lián)盟）Itisconsideredtheworstnuclearpowerplantaccidentinhistory,anditistheonlyoneclassified（被分類的）asalevel7eventontheInternationalNuclearEventScale.（規(guī)模）TheChernobyl（切爾諾貝利）NuclearAccident第2頁(yè)/共14頁(yè)MainCausesOperating（運(yùn)轉(zhuǎn)）instructionsanddesigndeficiencies（不足）

Operatorerror（失誤）initially（最初的）faulted①

Thereactorhadadangerouslylargepositivevoid（無(wú)效的）coefficient（系數(shù)）.②

Amoresignificantflaw（缺點(diǎn)）wasinthedesignofthecontrolrods（權(quán)）thatareinsertedintothereactortoslowdownthereaction.Thedevelopersofthereactorplantconsideredthiscombinationofeventstobeimpossibleandthereforedidnotallowforthecreationofemergencyprotectionsystemscapableofpreventingthecombinationofeventsthatledtothecrisis.（危機(jī)）第3頁(yè)/共14頁(yè)Theleakage（泄露）radiation（輻射）dustwithairblowingintothewesternregionofSoviet（蘇維埃）Union,EasternEuropeandTheNordicScandinavian（北歐斯堪納威亞半島）Peninsula.Ukraine,BelarusandRussiaaretheMostpolluted.Pollutionscales第4頁(yè)/共14頁(yè)Aftermath

1)Internationalspreadofradioactivesubstances2)Radioactiverelease3)Healthofplantworkersandlocalpeople4)ResidualradioactivityintheenvironmentMapofradiationlevelsin1996aroundChernobyl.第5頁(yè)/共14頁(yè)TheChernobylaccidentkilledmorethan30peopleimmediately,andasaresultofthehighradiationlevelsinthesurrounding20-mileradius（半徑）,135,000peoplehadtobeevacuated（疏散）.In2006,TheOtherReportOnChernobylpointedoutthereareabout4000peoplewilldiefromtheexcessiveradiation.第6頁(yè)/共14頁(yè)TheresultantreleaseofradioactivitythreatensmanythousandsofpeoplealloverEuropewithcancer.Uptonow,themalformationfetus(畸形兒)stillbirthduetothelong-termeffectsofradioactivematerial.第7頁(yè)/共14頁(yè)Theaccidentareaisstillcontaminated（污染）anduninhabitable（杳無(wú)人跡的）.第8頁(yè)/共14頁(yè)

Theonceprosperous（繁榮的）cityhasbecomea“ghostcity”第9頁(yè)/共14頁(yè)Actions

April26,1986,over8tonsleakageofstrongradiation.Unit4wassubsequentlyreinforcedconcreteseal,thename"sarcophagus（石棺）第10頁(yè)/共14頁(yè)Sarcophagus"hasbeeninusefornearly25years,nowithasbeentheappearanceofcracks.Ukrainehopesinthe"sarcophagus"ontheinstallationofa100-meterhighsteelarch石棺“已使用了近25年，現(xiàn)在它已經(jīng)出