福岛第一核电站1号机组Nuclear Reactor的宇宙μ子射线照相研究
Investigation of Unit-1 Nuclear Reactor of the Fukushima Daiichi by Cosmic Muon Radiography
摘要：
我们采用宇宙μ子射线照相法对福岛第一核电站1号反应堆核燃料组件的状态进行了调查。在这项研究中，μ子跟踪探测器被放置在反应堆建筑物的外面。通过反应堆厂房的混凝土墙，我们成功地识别了反应堆安全壳、压力容器等反应堆厂房的内部结构。我们发现，在压力容器内的原燃料装载区，有大量的燃料组件丢失。可以很自然地解释为，大部分核燃料都融化掉了，落到了压力容器的底部，甚至更低。
英文摘要：
We have investigated the status of the nuclear fuel assemblies in Unit-1 reactor of the Fukushima Daiichi Nuclear Power plant by the method called Cosmic Muon Radiography. In this study, muon tracking detectors were placed outside of the reactor building. We succeeded in identifying the inner structure of the reactor complex such as the reactor containment vessel, pressure vessel, and other structures of the reactor building, through the concrete wall of the reactor building. We found that a large amount of fuel assemblies was missing in the original fuel loading zone inside the pressure vessel. It can be naturally interpreted that most of the nuclear fuel was melt and dropped down to the bottom of the pressure vessel or even below.
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