ICMST-Tohoku 2018
Oct. 23 - 26, 2018
Sendai, Japan
ICMST-Shenzhen 2016
Nov 1 - 4, 2016
Shenzhen, China
ICMST-Kobe 2014
Nov 2(Sun) - 5(Wed), 2014
Kobe, Japan
Nuclear Regulation Authority Outline of the New Safety Standards for Light Water Reactors for Electric Power Generation
For Public Comment
Outline of New Safety Standard (Design Basis)
For Public Comment
New Safety Standards (SA) Outline (Draft)
For Public Comment
Outline of New Safety Standard(Earthquake and Tsunami)(DRAFT)

Vol.10 No.2(Aug)
Vol.10 No.1(May)
Vol.9 No.4(Feb)
Vol.9 No.3(Nov)

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Occasional Topics
OTjapan Measures for Tsunami Striking Nuclear Power Station in Japan
Special Article: The Great Tohoku Earthquake (1)
OTjapan The Tragedy of “To Be” Principle in the Japanese Nuclear Industry
EJAMOT_CN3_Figure1_The_outside_view_of_CEFR OTChinaPlanning and Consideration on SFR R&D Activities in China
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Featured Articles
EJAM7-3NT72 A New Mechanical Condition-based Maintenance Technology Using Instrumented Indentation Technique
EJAM7-3NT73 Survey robots for Fukushima Daiichi Nuclear Power Plant

(in English)


Vol.11 No.3previousAA SP21(AA163-164) NT95

Academic Articles
Vol. 11, No. 3 (2019) p.112-p.123

Special Issue 21

The 4th International Conference on Maintenance Science and Technology (ICMST-Tohoku 2018)


ICMST-Tohoku 2018, the 4th International Conference on Maintenance Science and Technology was held at "Sakura Hall" on Tohoku University Katahira campus in Sendai, Miyagi, Japan between the 23rd and the 26th of October 2018. ICMST-Tohoku 2018 was the latest of a highly successful series which started in Tokyo (Japan, 2012) and continued in Kobe (Japan, 2014) and Shenzhen (China, 2016).

Maintenance is still an uncharted area for humankind, and we have to study energetically. After the Fukushima accident, the credibility of nuclear safety has been an important issue worldwide. The conference continues to be the key forum for scientists and engineers interested in maintenance science and technology for nuclear power plants.

ICMST-Tohoku 2018 featured 101 presentations given to 209 attendees from nine countries. Publication in these special issues was voluntary and after peer review. This could not have been achieved without the very significant efforts of both reviewers and authors. Without this work, these special issues could not exist, and I would like to thanks them on behalf of the Publication Committee. I hope that all those who attended would share my opinion that ICMST-Tohoku 2018 was a vibrant, exciting and productive conference and that these special issues give some sense of the success of ICMST-Tohoku 2018 to the reader.

Finally, I would like to thank the members of the ICMST International Steering Committee, the Organizing Committee, the Local Organizing Committee and the Secretariat without whose tireless work ICMST-Tohoku 2018 would not have succeeded.

Guest Editor,
Kenji Suzuki

Daiki OSANAI, Tomohiro ICHIKAWA, Ken SATO, Wataru NISHIYA, and Masaki HOSOGOE

At the maintenance of hydraulic pipe system during continuous operation in many industrial plants, an ice plug technology for temporary partial isolation is generally applied. We have been developing ice plug technology in order to apply to nitric acid pipe systems. As chemical reagents such as nitric acid possess volume shrinkage characteristic in contrast to water, we implemented mock-up test in order to study specific freezing process of nitric acid and application ability of the ice plug technology.
Consequently, we confirmed nitric acid transferred completely to white solid phase around -60 °C to -70 °C. Furtehrmore, in mock-up test, approximate 40 °C of freezing point depression originated from freezing concentration process of nitric acid was observed. It did not affect ice plug formation, it was possible to form ice plug possessed sufficient pressure resistance performance with freezing completion time of estimated freezing process.

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Xiaodong ZHANG, Bin WU, Xiucheng LIU and Cunfu HE

The residual plastic strain in ferromagnetic structural components will affect the structural integrity, the mechanical properties of materials and even the service life. Therefore, accurately characterizing the degree of residual plastic strain is important to predict the service life time of components. The plastic deformation changes the dislocation density and the magnetic hysteretic properties of ferromagnetic materials. The variation in the shape of magnetic hysteresis curves will be suitable indicators for nondestructive evaluation of the residual plastic deformation in ferromagnetic steels. The core issue is to find stable magnetic parameters a that are sensitive to the changes of the residual plastic strain. In this study, the performances of the magnetic parameters (including coercive force Hc, maximum magnetic flux density Bmax, hysteresis loss WL and the harmonic amplitudes of magnetic flux density b1, b3) to the residual plastic strain in low carbon steel were investigated by experiments. Especially, the influences of excitation frequency on the performances of magnetic parameters in characterizing the residual plastic strain were analyzed. The results show that both the parameters of Bmax and b1 demonstrate linear dependency on the residual plastic strain εp even the frequency of the applied magnetic field changes. Therefore, the parameters of Bmax and b1 are preferred parameters to characterize the residual plastic strain in the tested low carbon steel.

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