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김지현

Kim, Ji Hyun
UNIST Nuclear Innovative Materials Lab.
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Online monitoring method using Equipotential Switching Direct Current potential drop for piping wall loss by flow accelerated corrosion

Author(s)
Ryu, Kyung HaLee, Tae HyunKim, Ji HakHwang, Il SoonLee, Na YoungKim, Ji HyunPark, Jin HoSohn, Chang Ho
Issued Date
2010-03
DOI
10.1016/j.nucengdes.2009.11.036
URI
https://scholarworks.unist.ac.kr/handle/201301/18416
Fulltext
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=74849102279
Citation
NUCLEAR ENGINEERING AND DESIGN, v.240, no.3, pp.468 - 472
Abstract
The flow accelerated corrosion (FAC) phenomenon persistently impacts plant reliability and personnel safety. We have shown that Equipotential Switching Direct Current Potential Drop (ES-DCPD) can be employed to detect piping wall loss induced by FAC. It has been demonstrated to have sufficient sensitivity to cover both long and short lengths of piping. Based on this, new FAC screening and inspection approaches have been developed. For example, resolution of ES-DCPD can be adjusted according to its monitoring purpose. The developed method shows good integrity during long test periods. It also shows good reproducibility. The Seoul National University FAC Accelerated Simulation Loop (SFASL) has been constructed for ES-DCPD demonstration purposes. During one demonstration, the piping wall was thinned by 23.7% through FAC fora 13,000 min test period. In addition to the ES-DCPD method, ultrasonic technique (UT) has been applied to SFASL for verification while water chemistry was continually monitored and controlled using electrochemical sensors. Developed electrochemical sensors showed accurate and stable water conditions in the SFASL during the test period. The ES-DCPD results were also theoretically predicted by the Sanchez-Caldera's model. The UT, however, failed to detect thinning because of its localized characteristics. Online LIT that covers only local areas cannot assure the detection of wall loss.
Publisher
ELSEVIER SCIENCE SA
ISSN
0029-5493

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