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)

< Other Issues


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
< All Occasional Topics

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.12 No.1previousAA SP23 (AA172-173)-AA174 NT97

Academic Articles
Regular Paper Vol. 12 No. 1 (2020) p.1 - p.6

Development of a Pipe-Wall Thinning Inspection Method Based on a Wireless UT Sensor


Akinori TAMURA1, Masao ENDO1, Naoyuki KONO1, Shinobu OKIDO2, Chenghuan ZHONG3, Erik FABRE3, Maria KOGIA3, Anthony J. CROXFORD4 and Paul D. WILCOX4

1 Hitachi Ltd. R&D Group, 1-1 Omika-cho 7-chome, Hitachi, Ibaraki 319-1292, Japan
2 Hitachi GE Nuclear Energy Ltd., 1 1 Saiwai cho 3-chome, Hitachi, Ibaraki 317-0073, Japan
3 Inductosense Ltd, Unit DX, St Philips Central, Albert Road, Bristol BS2 0XJ, UK.
4 University of Bristol, University Walk, Bristol BS8 1TR, UK.

Aiming to reduce inspection time of pipe-wall thickness measurements in nuclear power plants, we have been developing a new inspection method based on a wireless UT sensing technology which was originally proposed by University of Bristol. Utilizing the characteristics of the wireless UT sensor, the new inspection method enables the pipe-wall measurement without removal of pipe insulation which is a time-consuming process in general. One of the issues which needs to be addressed is existence of a metal jacket covering the pipe insulator. Since the wireless UT sensor is based on electromagnetic induction between coils, a magnetic field between the coils is interruped by the metal jacket and the wireless UT sensor is not applicable in this case. In this study, we developed the intermediate coil system (PCT/JP2018/020043) as one of the options to overcome this issue. In this system, two coils and cables are added into the original wireless UT sensor. Firstly, we developed an electrical circuit model to optimize the system design, and confirmed that the developed electrical circuit model has sufficient accuracy by the comparison with the experiment result. Then we performed the feasibility test of the intermediate coil system in the pipe-wall thinning measurement by using the test apparatus which simulates the pipe in the actual nuclear power plant. From these results, we have confirmed the feasibility of the intermediate coil system in the pipe-wall thinning measurement. Further development and evaluation will be conducted to apply this system into the actual plant inspection in the future study.
Ultrasonic testing, wireless sensor, pipe-wall thinning, nuclear power plant, inductive coupling
Full Paper: PDF
Article Information
Article history:
Received 15 October 2018
Accepted 11 March 2020