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도의순(Euisoon Doh),조윤호(Younho Cho),이재선(Jaesun Lee),김윤원(Yoonwon Kim),도화식(Hwasik Do) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
This Article describes the Inspection Technologies of main Nuclear Facility in Domestic and Foreign Country. The Inspection of Reactor Vessel has been applying PDI for UT examination since 2005 in Korea. And the Reactor Upper Head has been inspected since 2003 in Korea influenced by the Penetration Nozzle degradation at Oconee NPP in USA. The Inspection of Bottom Head also has been applying since 2006 in Korea influenced by the Leakage of Penetration Nozzle at South Texas Project unit I in USA. The inspection techniques of both Upper head and Bottom head are applied Eddy current Testing for ID surface, and conventional and TOFD Ultrasonic testing for weld and material itself. The Dissimilar Metal Weld Inspection has been issued and performing with conventional UT or Phased Array UT with EPRI POI system for PZR, RCS Piping welds and other welds since 2007 in accordance with MRP-139. The DM welds in PZR at Kori unit 1 were carried out Overlaid welds and inspected using Phase Array UT in 2010, and other DMW using Alloy 600 at PZR will be performed Weld overlay in short future.
초음파 DAC 기법을 이용한 압력용기 용접부의 지시 크기측정 정확도 평가
김재동,임형택,도의순,Kim, Jae Dong,Lim, Hyung Taik,Doh, Eui Soon 한국압력기기공학회 2015 한국압력기기공학회 논문집 Vol.11 No.2
During refueling Outage, In-service inspections(ISIs) for the Nuclear Power Plant components are mandatory requirement in accordance with ASME Code Sec. XI. Especially, in current ultrasonic testing is one of the most important NDT techniques that are used for volumetric examination methods for nuclear power plant components, and accurate sizing of flaw indication by UT is essential to assure the integrity of the components. However, ASME code specifies minimum requirement for vessel examination procedure, and so far many different flaw sizing approaches have been tried to apply. Through the Round Robin Test(RRT), the accuracy of ultrasonic flaw sizing using DAC techniques was measured with the mock-ups simulating typical pressure vessel welds. These mock-ups contain artificially introduced flaws of known size and location. This paper shows experimental comparison data on the accuracy of techniques using such as 6dB drop, 50%DAC, 20%DAC and 20%DAC with beam spread correction, and also shows that diverse DAC techniques can be effectively applied to the assessment of the flaw sizing for pressure vessel welds in the stage of welding and fabrication.