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Vol.9 No.2previous AASP17 (125-126-127-128-129-130-131-132-133-134-135-136-137-138-139-140-141-142) NT85

Academic Articles
Regular Paper Vol.9 No.2 (2017) p.60 - p.65
 

R&D of Multi-Frequency ECT Algorithms for FBR SG Tubes

 
Ovidiu MIHALACHE, Toshihiko YAMAGUCHI, Takuma SHIRAHAMA and Masashi UEDA
 

Japan Atomic Energy, Sector of Fast Reactor Research and Development, Monju Project Management and Engineering Center,1 Shiraki, Tsuruga-shi, Fukui-ken, 919-1279, Japan

 
Abstract
The adherence of sodium on the external surface of steam generator tubes of Fast Breeder Reactors adds an additional level of complexity in the in-service inspection of SGs using eddy current testing. The paper focusses on research and development of novel multi-frequency algorithms, based on eddy current signals, special developed and tuned to enhance the signal from defects located on external tube surface and to suppress electromagnetic noise from the conductive sodium and tube support plates. The application of the multi-frequency algorithm is investigated using both three-dimensional finite element simulations and experimental measurements from SG tubes soaked and then drained of sodium, in a sodium tank mock-up.
 
Keywords
eddy currents, multi-frequency, steam generator, fast breeder reactor, three dimensional finite element, sodium
 
Full Paper: PDF
Article Information
Article history:
Received 6 Novemver 2016
Accepted 27 April 2017