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

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 struct...

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Hauptverfasser:	Fujii, Hirofumi, Hara, Kazuhiko, Hayashi, Kohei, Kakuno, Hidekazu, Kodama, Hideyo, Nagamine, Kanetada, Sato, Kotaro, Kim, Shin-Hong, Suzuki, Atsuto, Sumiyoshi, Takayuki, Takahashi, Kazuki, Takasaki, Fumihiko, Tanaka, Shuji, Yamashita, Satoru
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Schlagworte:	Physics - High Energy Physics - Experiment Physics - Instrumentation and Detectors
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creator	Fujii, Hirofumi Hara, Kazuhiko Hayashi, Kohei Kakuno, Hidekazu Kodama, Hideyo Nagamine, Kanetada Sato, Kotaro Kim, Shin-Hong Suzuki, Atsuto Sumiyoshi, Takayuki Takahashi, Kazuki Takasaki, Fumihiko Tanaka, Shuji Yamashita, Satoru
description	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.
doi_str_mv	10.48550/arxiv.2003.02057
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title	Investigation of Unit-1 Nuclear Reactor of the Fukushima Daiichi by Cosmic Muon Radiography
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