核辐射英语演讲PPT

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1、Even the spectacular nuclear disasters at Three-Mile Island and Chernobyl were far less serious as technical failures than they were in their ecological effects.即使三里岛和切尔诺贝利的核灾难在技术上的失败比起它们对于生态系统所造成的影响也小得多。The Chernobyl Nuclear AccidentThe Fukushima Daiichi nuclear disasterThe Three Mile Island Accide

2、ntThe Three Mile Island AccidentThe Chernobyl Nuclear AccidentThe Fukushima Daiichi nuclear disasterThe Three Mile Island AccidentThe Chernobyl Nuclear AccidentThe Fukushima Daiichi nuclear disasterThe Three Mile Island AccidentThe Chernobyl Nuclear AccidentThe Fukushima Daiichi nuclear disasterThe

3、Three Mile Island AccidentThe Three Mile Island accident was a partial nuclear meltdown which occurred in one of the two Three Mile Island nuclear reactors in Dauphin County, Pennsylvania, United States, on March 28, 1979. It was the worst accident in U.S. commercial nuclear power plant history. The

4、 incident was rated a five on the seven-point International Nuclear Event Scale: Accident With Wider Consequences.1.The Three Mile Island AccidentThe power plant was owned and operated by General Public Utilities and Metropolitan Edison (Met Ed). The reactor involved in the accident, Unit2, was a pr

5、essurized water reactor manufactured by Babcock & Wilcox.Main Causes当天凌晨4时0分0秒，三哩岛核电站95万千瓦压水堆电站二号反应堆一回路的给水主泵停转，汽轮机停机。备用泵按照预设的程序启动，但是由于辅助给水系统中隔离阀在此前的例行检修中没有按规定打开，导致辅助给水系统没有投入运行。 Consequences of stuck valve(隔离阀隔离阀) The design of the PORV(减压阀) indicator light was fundamentally flawed .And the opera

6、tors had not been trained to use it. The operators did not correctly diagnose the problemNuclear leak alarm did not attract the attention of operatorsHuman factors Emergency MeasuresSchools were closed and residents were urged to stay indoors.Pregnant women and pre-school age children were emergency

7、 evacuation.Farmers were told to keep their animals under cover and on stored feedCleanup started in August 1979 and officially ended in December 1993, with a total cleanup cost of about $1 billion Fifty miles around Three Mile Island nuclear power plant, none of the 2200000 residents had the acute

8、radiation reaction. 在以三哩岛核电站为圆心的50英里范围内，220万居民中无人发生急性辐射反应。The average radiation dose to people living within ten miles of the plant was eight millirem. Eight millirem is about equal to a chest X-ray. 周围居民所受到的辐射相当于进行了一次胸部X光照射的辐射剂量。 The accident has had no observable long term health effects 三哩岛核泄漏事故对

9、于周围居民的癌症发生率没有显著性影响。Disease rates in areas further than 10 miles from the plant were never examined 三哩岛附近未发现动植物异常现象,当地农作物产量未发生异常变化。But the leak accident of nuclear power plant reactor No. two was seriously damaged, the direct economic loss one billion. 但是泄漏事故造成核电站二号堆严重损毁，直接经济损失达10亿美元之巨。 AftermathThe