日本提高福岛核污水泄漏事故级别
<p>日本原子能规制委员会日前将福岛核电站核污水泄漏事故级别从一级提高至三级，形容其为“严重事件”，并对东电公司应对这一事故的能力表示担心。国际核辐射事件分级表根据泄漏事件严重程度将其分成0至7级，7级为最严重。本周一，东电公司发现福岛核电站一处高辐射性污水储罐发生泄漏，预计已有300吨高辐射性污水泄漏。东电公司最近的一份报告显示，部分污水已渗入地表，部分或已流入附近的太平洋海域。东电检测发现，已泄露污水每小时的辐射释放量为100毫希沃特，这意味着，按照国际安全标准，如果一个人站在那里一小时内所受的辐射量将是核电作业人员一年内所能承受辐射上限的5倍。</p><p>2011年地震海啸使福岛核电站三处核反应堆冷却系统失灵，需要将水泵入反应堆帮助其冷却，同时也需要大量的储罐来存储这些带有高辐射性的污水。此前也发生过核污水泄漏事故，但此次泄漏事件是至今为止最严重的一次。</p><p><span word="Japan">Japan</span>'<span word="s">s</span> <span word="nuclear">nuclear</span> <span word="agency">agency</span> <span word="has">has</span> <span word="upgraded">upgraded</span> <span word="the">the</span> <span word="severity">severity</span> <span word="level">level</span> <span word="of">of</span> <span word="a">a</span> <span word="radioactive">radioactive</span> <span word="water">water</span> <span word="leak">leak</span> <span word="at">at</span> <span word="the">the</span> <span word="Fukushima">Fukushima</span> <span word="plant">plant</span> <span word="from">from</span> <span word="one">one</span> <span word="to">to</span> <span word="three">three</span> <span word="on">on</span> <span word="an">an</span> <span word="international">international</span> <span word="scale">scale</span>.</p><p><span word="Highly">Highly</span> <span word="radioactive">radioactive</span> <span word="water">water</span> <span word="was">was</span> <span word="found">found</span> <span word="to">to</span> <span word="be">be</span> <span word="leaking">leaking</span> <span word="from">from</span> <span word="a">a</span> <span word="storage">storage</span> <span word="tank">tank</span> <span word="into">into</span> <span word="the">the</span> <span word="ground">ground</span> <span word="at">at</span> <span word="the">the</span> <span word="plant">plant</span> <span word="on">on</span> <span word="Monday">Monday</span>.</p><p><span word="It">It</span> <span word="was">was</span> <span word="first">first</span> <span word="classified">classified</span> <span word="as">as</span> <span word="a">a</span> <span word="level">level</span> <span word="one">one</span> <span word="incident">incident</span> <span word="on">on</span> <span word="the">the</span> <span word="International">International</span> <span word="Nuclear">Nuclear</span> <span word="and">and</span> <span word="Radiological">Radiological</span> <span word="Event">Event</span> <span word="Scale">Scale</span> (<span word="Ines">Ines</span>).</p>
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