高考英语 考前突破阅读理解能力 国际时事要闻 福岛核电站地下水受到放射污染.doc

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1、福岛核电站地下水受到放射污染HighlevelsofatoxicradioactiveisotopehavebeenfoundingroundwateratJapan'sFukushimanuclearplant,itsoperatorsays.福岛核电站附近的地下水中发现高剂量有毒的放射性同位素。 TokyoElectricPowerCompany(Tepco)saidtestsshowedstrontium-90waspresentat30timesthelegalrate. Theradioactiveisotopetritiumhasalsobeendetectedate

2、levatedlevels. Theplant,crippledbythe2011earthquakeandtsunami,hasrecentlyseenaseriesofwaterleaksandpowerfailures. Thetsunamiknockedoutcoolingsystemstothereactors,whichmelteddown.  WaterisnowbeingpumpedintothereactorstocoolthembutthishasleftTepcowiththeproblemofhowtosafelystorethecontaminatedw

3、ater.  Therehavebeenseveralreportsofleaksfromstoragetanksorpipes.  Seasamples Strontium-90isformedasaby-productofnuclearfission.TestsshowedthatlevelsofstrontiumingroundwaterattheFukushimaplanthadincreased100-foldsincetheendoflastyear,ToshihikoFukuda,aTepcoofficial,toldmedia. MrFukudasaidTepco

4、believedtheelevatedlevelsoriginatedfromaleakofcontaminatedwaterinApril2011fromoneofthereactors. "Asit'snearwheretheleakfromreactornumbertwohappenedandtakingintoaccountthesituationatthetime,webelievethatwaterleftoverfromthattimeisthehighestpossibility,"hesaid. Tritium,usedinglow-in-the-darkwat

5、ches,wasfoundateighttimestheallowablelevel. MrFukudasaidthatsamplesfromtheseashowednoriseineithersubstanceandthecompanybelievedthegroundwaterwasbeingcontainedbyconcretefoundations.  "Whenwelookattheimpactthatishavingontheocean,thelevelsseemtobewithinpasttrendsandsowedon'tbelieveit'shavinganef

6、fect."  2Butthediscoveryisanotherset-backforTepco'splantopumpgroundwaterfromtheplantintothesea,correspondentssay. NuclearchemistMichiakiFurukawatoldReutersnewsagencythatTepcoshouldnotreleasecontaminatedwaterintotheocean. "Theyhavetokeepitsomewheresothatitcan'tescapeoutsidetheplant,"hesaid."Te

7、pconeedstocarryoutmoreregulartestinginspecificareasanddiscloseeverythingtheyfind." TheFukushimapowerplanthasfacedaseriesofproblemsthisyear.Earlythismonth,radioactivewaterwasfoundleakingfromastoragetank. Theplantalsosufferedthreepowerfailuresi