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Assessment of Pipe Wall Loss Using Guided Wave Testing  

Joo, Kyung-Mun (Korea Hydro and Nuclear Power Co., Ltd.)
Jin, Seuk-Hong (Korea Hydro and Nuclear Power Co., Ltd.)
Moon, Yong-Sig (Korea Hydro and Nuclear Power Co., Ltd.)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.30, no.4, 2010 , pp. 295-301 More about this Journal
Abstract
Flow accelerated corrosion(FAC) of carbon steel pipes in nuclear power plants has been known as one of the major degradation mechanisms. It could have bad influence on the plant reliability and safety. Also detection of FAC is a significant cost to the nuclear power plant because of the need to remove and replace insulation. Recently, the interest of the guided wave testing(GWT) has grown because it allows long range inspection without removing insulation of the pipe except at the probe position. If GWT can be applied to detection of FAC damages, it will can significantly reduce the cost for the inspection of the pipes. The objective of this study was to determine the capability of GWT to identify location of FAC damages. In this paper, three kinds of techniques were used to measure the amplitude ratio between the first and the second welds at the elbow area of mock-ups that contain real FAC damages. As a result, optimal inspection technique and minimum detectability to detect FAC damages drew a conclusion.
Keywords
FAC(Flow Accelerated Corrosion); Guided Wave Testing(GWT); Frequency Regime; Bulk Wave; dB(Decibel); Tone-Burst Wave; ECL(Estimated Cross-Section Loss);
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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