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http://dx.doi.org/10.7779/JKSNT.2013.33.5.465

Electrical Characteristics Measurement of Eddy Current Testing Instrument for Steam Generator in NPP  

Lee, Hee-Jong (KHNP Central Research Institute)
Cho, Chan-Hee (KHNP Central Research Institute)
Yoo, Hyun-Joo (KHNP Central Research Institute)
Moon, Gyoon-Young (KHNP Central Research Institute)
Lee, Tae-Hun (KHNP Central Research Institute)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.33, no.5, 2013 , pp. 465-471 More about this Journal
Abstract
A steam generator in nuclear power plant is a heatexchager which is used to convert water into steam from heat produced in a nuclear reactor core, and the steam produced in steam generator is delivered to the turbine to generate electricity. Because of damage to steam generator tubing may impair its ability to adequately perform required safety functions in terms of both structural integrity and leakage integrity, eddy current testing is periodically performed to evaluate the integrity of tubes in steam generator. This assessment is normally performed during a reactor refueling outage. Currently, the eddy current testing for steam generator of nuclear power plant in Korea is performed in accordance with KEPIC & ASME Code requirements, the eddy current testing system is consists of remote data acquisition unit and data analysis program to evaluate the acquired data. The KEPIC & ASME Code require that the electrical properties of remote data acquisition unit, such as total harmonic distortion, input & output impedance, amplifier linearity & stability, phase linearity, bandwidth & demodulation filter response, analog-to-digital conversion, and channel crosstalk shall be measured in accordance with the KEPIC & ASME Code requirements. In this paper, the measurement requirements of electrical properties for eddy current testing instrument described in KEPIC & ASME Code are presented, and the measurement results of newly developed eddy current testing instrument by KHNP(Korea Hydro & Nuclear Power Co., LTD) are presented.
Keywords
Eddy Current Testing; Eddy Current Signal Generation; Electrical Characteristic Measurement;
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  • Reference
1 ASME B&PV Code Sec. V(Nondestructive Examination), 2010 Edition Article 8, "Eddy current examination of nonferromagnetic heat exchanger tubing"
2 KEPIC MEN A8, "Eddy current examination," App. II "Eddy current exam. of nonferromagnetic heat exchanger tubing"
3 ASME B&PV Code Sec. XI(Rules for Inservice Inspection of Nuclear Power Plant), 2010 Edition App. IV, "Eddy current examination"
4 KEPIC MI(Rules for Inservice Inspection of Nuclear Power Plant), App. IV, "Eddy current examination"
5 EPRI SGMP, "Pressurized water reactor steam generator examination guidelines," Revision 7, EPRI-TR 1013706, 2007
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