Abstract
Efficient algorithms for pre-processing of eddy-current signals that are typical when inspecting the condition of metal in the heat-exchanger pipes of steam generators of NPPs with VVÉR-440 and VVÉR-1000 reactor facilities are described. Flaws in these pipes can be reliably detected and classified, with their geometrical parameters evaluated, if one can tune out from multiple interfering factors and disturbances that affect the signal and emerge due to a number of structural irregularities in the test object (geometrical noise (pilger noise), spacer and antivibration grids, bends), specific detector-design features, and noises in the measuring tract of eddy-current apparatus. The tuning-out algorithms have been tested with experimental signals and incorporated in the PIRATE (Program for Identification & Recognition of defects through signal Analysis in Testing by Eddy currents) software intended for analyzing multifrequency signals.
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Lukasevich, BI., Trunov, NB., Dragunov, Yu.G., and Davidenko, SE., Parogeneratory reaktornykh ustanovok VVER dlya atomnykh elektrostantsii (Steam Generators of VVÉR Reactor Facilities for Nuclear Power Plants), Moscow: Akademkniga, 2004.
www.areva.com/
Technical description of INETEK eddy-current equipment for testing steam generators at VVÉR 440/1000 power stations. http://www.inetec.com/
www.tecnatom.es/
www.metaltrade.ru/abc/p/prokatka.htm
Das, M, Ramuhalli, P, Udpa, L, and Udpa, S, An adaptive wiener filter based technique for automated detection of defect locations from bobbin coil eddy current data, Rev. Progr. Quant. Nondestr. Eval., Thompson, DO. and Chimenti, DE., Eds., Am. Inst. Phys., 2002, vol. 21, pp. 639–646.
Lopez, L, Ting, D, and Upadhyaya, B, Removing eddy-current probe wobble noise from steam generator tubes testing using wavelet transform, Prog. Nucl. Energy, 2008, pp. 1–8.
Grman, J and Ravas, R, Application of wavelet transformation in eddy current testing of steam generator tubes, IEEE Instrum. Meas. Technol. Conf., Budapest, 2001, pp. 392–396.
Shchukis, EG. and Lunin, VP., Applying discrete wavelet transform to isolate signals due to structural elements, in Trudy 18-i mezhdunar. nauch.-tekhn. konf. “Informatsionnye sredstva i tekhnologii” (Proc. 18th Int. Sci. Tech. Cond. “Computer-Based Means and Technologies”), Moscow, 2010, vol. 2, pp. 152–160.
Shchukis, EG., Improving reliability of eddy-current testing of heat-exchanger NPP steam generators based on wavelet analysis and fuzzy logic algorithms, Cand. Sci. (Tech.) Dissertation, 2010.
Udpa, S and Ramuhalli, P, Automated Analysis of Bobbin Coil Probe Eddy Current Data, Palo Alto, CA: EPRI, 2003.
Zhdanov, AG., Improving reliability of analysis of data of eddy-current testing of heat-exchanger pipes of NPP steam generators, Cand. Sci. (Tech.) Dissertation, 2014.
Lazutkin, DYu., Lunin, VP., and Zhdanov, AG., Suppressing signals due to interferences in eddy-current testing of steam-generator pipes, in 14-ya mezhdunar. nauch.-tekhn. konf. studentov i aspirantov “Radioelektronika, elektrotekhnika i energetika”. Tez. dokl. (Abstr. 14th Int. Sci. Tech. Conf. Stud. Post-Grad. Stud. “Radioelectronics and Electrical and Power Engineering”), Moscow: MÉI, 2008, vol. 1, pp. 392–394.
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Original Russian Text © A.G. Zhdanov, E.G. Shchukis, V.P. Lunin, A.A. Stolyarov, 2018, published in Defektoskopiya, 2018, No. 4, pp. 54–64.
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Zhdanov, A.G., Shchukis, E.G., Lunin, V.P. et al. Algorithms for Pre-Processing of Eddy-Current Signals when Inspecting Heat-Exchanger Pipes of NPP Steam Generators. Russ J Nondestruct Test 54, 283–293 (2018). https://doi.org/10.1134/S1061830918040113
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DOI: https://doi.org/10.1134/S1061830918040113