Search

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

Information
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)
Issues
  Vol.5 No.4(Feb-25)
Vol.5 No.3(Nov-25)
Vol.5 No.2(Aug-26)
Vol.5 No.1(May-27)
< Other Issues

Featured Articles
EJAM5-3NT58 "Development of Future Prediction of Animation by coupling of Principle Component Analysis and Singular Spectrum Analysis"
EJAM5-3NT58 Validation of Multifrequency and Window-Multifrequency Techniques using Remote Field Eddy Currents for ISI of FBR Tubes
EJAM5-3NT59 Remote Controlled Robot with expandable features

JSM
Contacts
(EJAM): ejam@jsm.or.jp
(JSM): secretariat@jsm.or.jp
HP: http://www.jsm.or.jp
(in English)

 
Vol.1 No.1 ← GA 5 - AP 6 - 7 - NT 7 - 7(1)- 7(2) - 8 - 9Vol.1No.4
Academic Articles
(Contributed Paper) Vol.1 (2009) p.68 - p.76
 
Investigations of Multi-frequency Algorithms for Detection of Defects in FBR Magnetic Steam Generators Tubes Covered with Sodium
 
Ovidiu MIHALACHE, Shinya MIYAHARA, Toshihiko YAMAGUCHI, Takuya YAMASHITA
 
1 Japan Atomic Energy Agency, Fast Breeder Reactor Plant Engineering Research Center, 1 Shiraki, Tsuruga-shi, Fukui-ken, 919-1279, Japan
 
Abstract
In the present paper it is presented the performance of multi-frequency eddy currents algorithms to cope with the eddy current signal from both sodium structures located on the outer surface of magnetic steam generator tubes surface as well as support plates of steam generator tubes. The algorithm improves the signal to noise ratio of defects detection even when these are located under steam generator support plates. Experimental measurements of defects signals using eddy currents, when there is or there is no sodium on the outer tube surface, are used to validate reliable computer simulation models in order to investigate and optimize the multi-frequency algorithms. The parameters of the most reliable multi-frequency algorithm, based on two or three excitation frequencies and using both simulated and experimental remote field eddy current signals, are found out for both cases when sodium adhere or not to the SG tube surface and a defect is placed or not under sodium bands or SG supports plates.
 
Keywords
steam generator, fast breeder reactor, multi-frequency, remote field eddy current, sodium, support Plate, finite element method
 
Full Text: PDF
 
(Received: January 20th, 2009)