In this paper, a nondestructive testing system is proposed for inspecting heat exchanger tubes in the balance of plant of a nuclear power plant. A bobbin coil was used to excite an alternating elec-tromagnetic field in heat exchanger tubes, and a bobbin-type integrated hall sensor array (BIHaS) was used to measure the magnetic flux density distribution around discontinuities. The BIHaS was fabricated by arraying 30 hall sensor elements around the circumference of a probe. The system performance was verified by experiments conducted on three 304 stainless steel tubes with artificial circumferential groove, wear scar, axial/circumferential simulated crack, and flat-bottom hole discontinuities on the outer diameter surface. The proposed system showed potential for accurate detection and classification of disconti-nuity types. Furthermore, the discontinuity volume could be estimated.
ASME, 1998a, “ASME Section 5, Article 8: Eddy Current Examination of Tubular Products,” The American Society for Mechanical Engineers, New York, NY.
ASME, 1998b, “ASME Section 5, Article 26: Eddy Current Standards,” The American Society for Mechanical Engineers, New York, NY.
Drunen, G.V., and V.S. Cecco, 1984, “Recognizing Limitations in Eddy Current Testing,” NDT International, Vol. 17, No. 1, pp. 7–9.
EPRI, 1999, “Report TR-100385: Balance-of-Plant Heat Exchanger Condition Assessment Guidelines,” Electric Power Research Institute, Palo Alto, CA.
EPRI, 2002, “Report No.1003470, Feedwater Heater Maintenance Guide,” Electric Power Research Institute, Palo Alto, CA.
EPRI, 2008, “Report No. 1015126: Development of a Process for Deter-mining Examination Technique Equivalency,” Electric Power Research Institute, Palo Alto, CA.
Joubert, P.-Y., Y. Le Bihan, and D. Placko, 2002, “Localization of Defects in Steam Generator Tubes using a Multi-coil Eddy Current Probe Dedicated to High Speed Inspection,” NDT & E International, Vol. 35, No. 1, pp. 53–59.
Kurokawa, M., R. Miyauchi, K. Enami, and M. Matsumoto, 1999, “New Eddy Current Probe for NDE of Steam Generator Tubes,” Electromagnetic Nondestructive Evaluation (III), eds. D. Lesselier and A. Razek, IOS Press, Amsterdam, Netherlands, pp. 57–64.
Lafontaine, G., F. Hardy, and J. Renaud, 2001, “X-Probe® ECT array:
A High-Speed Replacement for Rotating Probes,” Third International Conference on NDE in Relation to Structural Integrity for Nuclear and Pressurized Components, Seville, Spain.
Le, M., J. Lee, J. Jun, and J. Kim, 2013, “Estimation of Sizes of Cracks on Pipes in Nuclear Power Plants using Dipole Moment and Finite Element Methods,” NDT & E International, Vol. 58, pp. 56–63.
Le, M., J. Kim, H. Vu, H.S. Do, and J. Lee, 2014, “Localization and Evalua-tion of Corrosion in a Small-Bore Piping System using a Bobbin-Type Magnetic Camera,” International Journal of Applied Electromagnetics and Mechanics, Vol. 45, Nos. 1–4, pp. 739–745.
Lee, J., J. Jun, J. Kim, H. Choi, and M. Le, 2012, “Bobbin-Type Solid-State Hall Sensor Array With High Spatial Resolution for Defects Inspection in Small-Bore Piping Systems,” IEEE Transactions on Magnetics, Vol. 48, No. 11, pp. 3704–3707.
Mihalache, O., T. Yamaguchi, and M. Ueda, 2012, “Multi-frequencies ECT Algorithms for ISI of Ferromagnetic SG Tubes of FBR using FEM Simula-tions,” International Journal of Applied Electromagnetics and Mechanics, Vol. 39, Nos. 1–4, pp. 347–353.
Obrutsky, L., J. Renaud, and R. Lakhan, 2007, “Steam Generator Inspec-tions: Faster, Cheaper and Better, Are We There Yet?” IV Conferencia Panamericana de END, Buenos Aires, Argentina, pp. 1–17.
Sadek, H.M., 2006, “NDE Technologies for the Examination of Heat Exchangers and Boiler Tubes – Principles, Advantages, and Limitations,” Insight, Vol. 48, No. 3, pp. 181–183.
Sim, S., M. Le, J. Kim, J. Lee, H. Kim, and H.S. Do, 2016, “Nondestructive Inspection of Control Rods in Nuclear Power Plants using an Encircling-Type Magnetic Camera,” International Journal of Applied Electromagnetics and Mechanics, Vol. 52, Nos. 3–4, pp. 1561–1567.
Uchanin, V., and V. Najda, 2011, “The Development of Eddy Current Technique for WWER Steam Generators Inspection,” Steam Generator Systems: Operational Reliability and Efficiency, ed. V. Uchanin, InTech, doi: 10.5772/16168, pp. 145–164.
Ye, C., Y. Huang, L. Udpa, and S. Udpa, 2016, “Novel Rotating Current Probe with GMR Array Sensors for Steam Generate Tube Inspection,” IEEE Sensors Journal, Vol. 16, No. 12, pp. 4995–5002.
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