Colloquium of NH group, Kyoto Univ. Toshiyuki Gogami 2015/2/23 Paper introduction of: Cosmic-ray...
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Transcript of Colloquium of NH group, Kyoto Univ. Toshiyuki Gogami 2015/2/23 Paper introduction of: Cosmic-ray...
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Colloquium of NH group, Kyoto Univ.
Toshiyuki Gogami
2015/2/23
Paper introduction of:
Cosmic-ray muon radiography of UO2 fuel assembly
T.Sugita et al., Journal of Nuclear Science and Technology 51, 7-8 (2014) 1024-1031
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再稼働しつつある原発
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3.11 The accident of Fukushima NPP
①②③④
Need information of melted fuel for decommissioning of reactor
Difficult to access due to too high radiation level
Muon radiography
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ミュオン透過法による炉内調査の開始‼
IRID ( 技術研究組合 国際廃炉研究開発機構 ) R&D topics; 2015/2/12
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Muon radiography
1. Transmission method[ Energy loss Stop ]Mane, Egyptian pyramid, temple gate, volcano, caverns etc.
2. Scattering (displacement) method[ Coulomb scattering Scattering angle (displacement) ]Invented at Los Alamos National Laboratory
H.K.M.Tanaka et al., Earth Planets Space 62 (2010) 119-129
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Transmission method
K.Takamatsu et al., Annals of Nuclear Energy 78 (2015) 166-175
At High-Temperature engineering Test Reactor (HTTR)
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Transmission method
K.Takamatsu et al., Annals of Nuclear Energy 78 (2015) 166-175
At High-Temperature engineering Test Reactor (HTTR)
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Scattering method
𝐿𝑖=𝑑𝑖 tan 𝜃𝑖(1+ tan❑𝜃𝑖0)
Depending on the radiation length !!
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Paper which will be introduced
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Toshiba Nuclear Critical Assembly
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Experimental setup
Mini Muon Tracker (MMT) system576 sealed drift tubes (5 cm diameter, 0.9 mm aluminum wall)1.2 m lengthxxyyxxyyxxyy (12 layers)
MMT1MMT2
C.L.Morris et al., Applied Physics Letters 104 (2014) 024110
30 days of data taking
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Cross section of NCA obtained by the scattering method
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Results
4 cm40 cm
20 cm
4 cm
±2 cmで一致
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Result comparison with Geat4 simulation
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Application for Fukushima Daiichi
Geant4 simulation model
10 m
10 m
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Challenge for the high rate gamma-ray background
Geant4 simulation model
10 m
10 m
20 μSv/h1000 μSv/h
FPGA trigger 50 μSv/h
7.5 cm thickness steel expects to be needed.
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Results of the simulation
50% melted core + 60 cm diameter debris Clearly seen !!
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Summary
Muon radiography
• Can be used for nuclear reactor investigation with resolution of 3 cm.
• Investigation of Fukushima Daiichi • Transmission method (1号機、 2015/2-)• Scattering method (2号機、 2015/10-)