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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.
 
Abstract
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.
 
Keywords
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