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25日,福岛第一核电站运营方“日本东京电力公司”公布了水下机器人最新拍摄的一组视频。视频显示,核电站3号机组安全壳底部存在大量堆积物,“可能是堆芯熔化后形成的核残渣”——这是东电首次在3号机组内发现疑似核残渣。
日本东京电力公司于19号、21号和22号,对福岛第一核电站3号机组的情况进行了为期3天的调查。
东京电力公司向3号机组内部投放了水下机器人。机器人拍摄画面显示,安全壳底部存在大量堆积物,高约1米,堆积物中还混有核事故中被损毁的机组部件——这是首次在3号机组内发现疑似核残渣。
![](http://img3.utuku.china.com/450x0/news/20170728/904fbad6-91a2-4566-862d-905e6dda8cba.jpg)
由于这一机器人不带有核辐射检测设备,因此无法明确判断这些堆积物是否为核残渣,但结合此前的各种分析研究,东京电力公司认为这些堆积物是核残渣的可能性较大。
回收在核事故中熔化的核残渣是项没有先例的巨大挑战,日本政府和东京电力公司的目标是今年9月出台核残渣取出方案,2021年实施,整个核电站的报废作业可能需要四五十年时间。
2011年日本“3·11大地震”引发核泄漏事故后,福岛第一核电站1至3号机组发生堆芯熔化,压力容器内的核燃料高温熔化后可能泄漏到外面一层安全壳的底部,但东京电力公司至今未能掌握核残渣位置。目前1至3号机组仍被持续注水冷却,安全壳底部大量积水,其中3号机组安全壳内水深达6米。
责任编辑:韩佟 CL1368
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