Authors:
Kwae Hwan Yoo
1
;
Ju Hyun Kim
1
;
Man Gyun Na
1
;
Jin Weon Kim
1
;
Kyeong Suk Kim
1
and
Chang-Doo Kee
2
Affiliations:
1
Chosun University, Korea, Republic of
;
2
Chonnam National Univ., Korea, Republic of
Keyword(s):
Infrared Thermography, Wall-thinned Defects, Infrared Camera, Cooling Device, Finite Element Analysis (FEA), Onpower Inspection.
Related
Ontology
Subjects/Areas/Topics:
Informatics in Control, Automation and Robotics
;
Intelligent Control Systems and Optimization
;
Intelligent Fault Detection and Identification
Abstract:
Wall-thinned defects, which are attributable to acceleration of corrosion that is occurred by fluid flow in the inner pipe, appear in various structures of the secondary system in nuclear power plants (NPPs), playing a role as a major factor to degrade integrity of pipes. It is required to manage wall-thinned defects not only when the NPP is under maintenance but also when the NPP is in normal operation. To this end, this paper developed a test technique to manage such wall-thinned defects based on temperature difference on surface
of hot pipe with use of infrared thermography and cooling device. Finite element analysis (FEA) was conducted to examine tendency of and test conditions for cooling experiment. Based on the FEA results, equipment was configured before the cooling experiment was conducted. Then, infrared camera was used to detect defects in the inner pipe of the pipe specimen that had artificially induced defects. The infrared thermography developed in this study is expecte
d to help resolve issues related to limitations on the nondestructive
inspection that is currently conducted for NPP’s secondary system and expected to be very useful on the NPP site.
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