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김경조,김진균,강성식,정명조 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.3
The Korea Institute of Nuclear Safety, as a representative organization of Korea, in February 2012 participated in an international Program to Assess the Reliability of Emerging Nondestructive Techniques initiated by the U.S. Nuclear Regulatory Commission. The goal of the Program to Assess the Reliability of Emerging Nondestructive Techniques is to investigate the performance of emerging and prospective novel nondestructive techniques to find flaws in nickel-alloy welds and base materials. In this article, Korean roundrobin test results were evaluated with respect to the test blocks and various nondestructive examination techniques. The test blocks were prepared to simulate large-bore dissimilar metal welds, small-bore dissimilar metal welds, and bottom-mounted instrumentation penetration welds in nuclear power plants. Also, lessons learned from the Korean roundrobin test were summarized and discussed.
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김경조,남태흠,김종민,김진겸,신호상 한국비파괴검사학회 2018 한국비파괴검사학회지 Vol.38 No.1
Leakage caused by the corrosion of buried and underground pipes has recently resulted in groundwater contamination incidents. Some of these groundwater contamination incidents attatched much interest USNRC and the public. The industry issued a guidance document Nuclear Energy Institute (NEI) 09-14, “Guideline for the Management of Buried Piping Integrity” to describe a licensee’s goals and required actions resulting from this underground piping and tank initiative. The NRC conducted inspections using TI 2515/173, “Review of the Implementation of the Industry Groundwater Protection Voluntary Initiative” to assess licensee response to these incidents and determine the extent of the industry’s voluntary groundwater protection initiative. According to NEI 09-14, utility-provided procedures, risk ranking, inspection plans and asset management plans, were evaluated by USNRC in accordance with TI 2515/173, which are the same evaluations and inspections required for aging degradation of Korea nuclear power plants (NPP). The purpose of this research is to develop regulatory techniques and guideline for aging management of buried and underground pipes and tanks in Korean NPP. For this purpose, aging management, direct and indirect inspection techniques and regulatory techniques for buried and underground pipes and tank will be evaluated and a database for the damage of buried and underground pipes and tanks will be developed. From these techniques and the database information, in-service inspection guidelines and review guidelines for aging management will be developed. 매설배관의 손상은 최근 원전 산업이 직면하고 있는 중요한 현안사항 중의 하나로 대두되고 있으며, 지상의 배관과는 달리 배관 내부의 유체로 인한 부식, 배관 외부의 토양으로 인한 기계적, 화학적 손상 그리고 중 하중에 의한 피로 등을 동시에 경험하고 있다. 매설배관에서 누설이 발생할 경우에는 누설의 원인을 찾기가 어려울 뿐만 아니라 접근도 용이하지 않아 적절한 시기에 정비하기란 매우 어렵다. 현재의 매설배관 건전성 관리는 누설 시 위치를 파악하고 임시보수 또는 경상정비를 통하여 사후처리를 진행하므로, 토양 또는 콘크리트에 매립된 매설배관의 잠재적인 손상징후 파악과 그에 대한 건전성 평가에 상당한 제한을 받고 있다. 이에 따라 국내 원전에 적용 가능한 매설배관 경년열화관리 프로그램의 구축 필요성이 대두되었으며, 이를 위해 국내 원전의 관리대상 매설배관 계통을 도출하고 그에 대한 체계적인 위험도 분석, 데이터베이스 구축, 상세 평가, 외부 및 내부 비파괴검사 기술개발 및 규제지침 개발 등이 필요하다. 본 연구에서는 원전 매설배관 및 탱크에 대한 규제지침을 개발하기 위해 국외에서 연구개발 또는 적용되는 규제요건, 사업자 문서와 국내 적용현황 등을 검토하여 매설배관 규제현황을 파악하였다. 규제현황을 파악하기 위하여 매설배관의 경년열화 관련 경험을 요약한 규제요건인 NUREG GALL 보고서, 미국 규제기관의 규제지침서(ISG), 규제기관에서 발행한 규제문서(TI), 개발 중인 ASME Code Case, 매설배관 미국 산업계 관리지침인 NEI 09-14 및 EPRI TR 1021175 등을 정리하였고 국내에 적용되고 있는 매설배관 경년열화 관리현황을 검토하였다. 이를 통해, 향후 국내 원전의 매설배관 규제에 적용될 수 있는 규제지침을 개발하여 원전의 가동중검사, 계속운전 심사 등 인허가를 위한 기술적 지침으로 활용할 예정이다.
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Detectability evaluation of the loose parts in steam generator by eddy current testing techniques
김경조,민경만,김창근,김진겸,정명조 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.7
Detectability of the loose parts (LPs) in steam generator (SG) was studied with eddy current testingtechnique such as X-probe, bobbin and rotating coils (MRPC®) as a function of LP size and spacing betweenLP and tube or between LP and support structures. SG mockup simulating SG tube and supportstructures with LP was fabricated. The X-probe showed slightly better detectability than MRPC® for LP offerrous (F-LP) material and vice versa for LP of nonferrous (NF-LP) material. In terms of feasibility, inspectionrate and other predictable features of the SG tubing inspections, X-probe can be used reliably formonitoring the LPs and the flaws formed by LPs on SG tube
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김경조,강성식,신호상,정구갑,송명호,정해동 한국비파괴검사학회 2009 한국비파괴검사학회지 Vol.29 No.3
After several damages by PWSCC were found in the world, USNRC and PNNL(Pacific Northwest National Laboratory) started the research on PWSCC under the project name of PINC. The aim of the project was 1) to fabricate representative NDE mock-ups with flaws to simulate PWSCCs, 2) to identify and quantitatively assess NDE methods for accurately detecting, sizing and characterizing PWSCCs, 3) to document the range of locations and morphologies of PWSCCs and 4) to incorporate results with other results of ongoing PWSCC research programs, as appropriate. Korea nuclear industries have also been participating in the project. Thermally and mechanically cracked-four mockups were prepared and phased array and manual ultrasonic testing(UT) techniques were applied. The results and lessons learned from the preliminary RRT are summarized as follows: 1) Korea RRT teams performed the RRT successfully. 2) Crack detection probability of the participating organizations was an average 87%, 80% and 80% respectively. 3) RMS error of the crack sizing showed comparatively good results. 4) The lessons learned may be helpful to perform the PINC RRT and PSI /ISI in Korea in the future.
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김경조,강성식,신호상,송명호,정해동,김용식 한국비파괴검사학회 2009 한국비파괴검사학회지 Vol.29 No.3
After several PWSCCs were found in Bugey(France), Ringhals(Sweden), Tihange(Belgium), Oconee, Arkansas, Crystal Fever, Davis-Basse, VC Summer(U.S.A.), Thuruga(Japan), USNRC and PNNL started the research on PWSCC, that is, the PINC project. USNRC required KINS to participate in the PINC project in May 2005. KINS organized the Korean consortium at March 2006 and Pre-RRT for RVHP were performed for the preparation of PINC RRT. Through these preliminary RRT, Korea NDE teams can learn and develop the detection and sizing technique for RVHP dissimilar metal weld. These techniques are now being prepared in Korea and need to be utilized for the In-service inspection of the RVHP and BMI of Korea Nuclear Power Plants. PINC RRT mock-ups will be helpful to training.
KCI
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