Investigation of Unit-1 Nuclear Reactor of the Fukushima Daiichi by Cosmic Muon Radiography release_6vdjmrimcjaxnijjfei2by43su

by Hirofumi Fujii, Hidekazu Kakuno , Shin-Hong Kim, Kazuki Takahashi and Satoru Yamashita University of Tsukuba

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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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Type  article
Stage   submitted
Date   2020-03-03
Version   v1
Language   en ?
arXiv  2003.02057v1
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