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http://dx.doi.org/10.20466/KPVP.2019.15.1.040

A Study for Flaw Detection of 3/4″ Pipe by Using Guided Wave  

Chung, Woo Geun (한국수력원자력 중앙연구원)
Kim, Jin-Hoi (한국수력원자력 중앙연구원)
Cheon, Keun Young (한국수력원자력 중앙연구원)
Publication Information
Transactions of the Korean Society of Pressure Vessels and Piping / v.15, no.1, 2019 , pp. 40-45 More about this Journal
Abstract
Unlike the welded pipes in the primary system of light water nuclear power plants being periodically inspected with in-Service inspection program, relatively small pipes with the outer diameter less than 2 inch have not been regularly inspected to date. However, after several failure reports on the occurrence of critical crack-like defects in small pipes, inspection for the small pipes has been more demanded because it could cause the provisional outage of nuclear power plants. Nevertheless, there's no particular method to examine the small pipes having access limitations for inspection due to various reasons; inaccessible area, excessive radiation exposure, hazardous surrounding, and etc. This study is to develop a reliable inspection technique using torsional and flexural modes of guided wave to detect defects that could occur in inaccessible area. The attribute of guided wave that can travel a long distance enables to inspect even isolated range of the pipe from accessible location. This paper presents a case study of the evaluation test on 3/4" small-bore pipes with guide wave method. The test result demonstrates the crack signal behavior and assures possibility to detect the crack signal in a flexural mode, which is clearly distinguishable from the symmetric structure signal in a torsional mode.
Keywords
Guided Wave; Torsional Mode; Flexural Mode; Small-bore Piping;
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