• Journal of the Korean Society for Nondestructive Testing
• /
• v.21 no.3
• /
• pp.319-329
• /
• 2001

• Journal of the Korean Society for Nondestructive Testing
• /
• v.15 no.3
• /
• pp.491-501
• /
• 1995

• Journal of the Korean Society for Nondestructive Testing
• /
• v.34 no.2
• /
• pp.184-189
• /
• 2014

• Journal of the Korean Society for Nondestructive Testing
• /
• v.3 no.2
• /
• pp.28-35
• /
• 1984

• Journal of the Korean Society for Nondestructive Testing
• /
• v.3 no.1
• /
• pp.31-35
• /
• 1983

AE technology developments directed at nuclear power plant application are reviewed and related activities in Korea are also briefly introduced.

• Journal of the Korean Magnetics Society
• /
• v.16 no.6
• /
• pp.305-308
• /
• 2006

Magnetic flux leakage (MFL) pigs are traditionally used for the detection of gross corrosion on steel pipelines used for the transmission of natural gas. Alternative nondestructive evaluation (NDE) modalities are required for the detection of stress corrosion cracking (SCC) which tends to exist in colonies oriented axially along the length of the pipeline. This paper describes the use of multiphase rotating magnetic fields in the remote region of the probe as a possible SCC detection mechanism. Details of a prototype pig and test rig are given and the challenges associated with the finite element modeling of the device are discussed. Initial experimental results show that this novel NDE modality is sensitive to axially oriented tight cracks.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.14 no.1
• /
• pp.39-47
• /
• 1994

원자력발전소의 상온수압시험에는 여러가지 목적이 있으며 그 중에서 가장 중요한 것 중 하나는 원전 주요 기기로부터의 누설여부를 알아내는 것이다. 동 시험에서 누설 여부를 알아내기 위해 현재 국내에서는 미국 규격에 따라 육안검사를 수행하고 있으나 프랑스의 경우, 음향방출 누설시험과 육안검사를 수행토록 하고 있다. 저자는 1992년과 1993년 중국 광동 원전 1, 2호기의 가동전검사에 참여하여 프랑스의 RSEM 규격에 따라 실시된 상온수압시험시의 음향방출 누설시험과 누설 육안검사에 대하여 기술 지원 업무를 수행하였다. 동시험에서는 시험 최고 압력인 228bar에서는 음향방출 누설 감시시험과 누설 육안검사를, 감압단계인 155bar 에서는 누설 육안검사를 수행하였다. 본고에서는 동 규격에 따라 최초로 수행된 중국 광동 원전 가동전검사 수압시험시의 음향방출에 의한 누설감시와 누설 육안검사에 대해 검사 기술, 검사 방법, 검사 절차, 그리고 검사 대상부위 등을 기술하였다.

• The Science & Technology
• /
• v.30 no.2 s.333
• /
• pp.75-77
• /
• 1997

구랍 8일부터 6일동안 인도 뉴델리에서 열린 제14차 세계 비파괴검사 학술대회는 30여개국에서 1천5백여명이 참석하였으나 외국인의 참석이 적었고 대회운영도 미숙했다. 우리나라에서는 8명의 발표자를 포함하여 모두 11명이 참석, 필자는 12일 논문을 발표하였고 캐나다 등 참석자들과 AE시험방법에 관한 토론을 했다.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.34 no.3
• /
• pp.254-259
• /
• 2014

A pressurized heavy water reactor (PHWR) core has 380 fuel channels contained and supported by a horizontal cylindrical vessel known as the calandria, whereas a pressurized water reactor (PWR) has only a single reactor vessel. The pressure tube, which is a pressure-retaining component, has a 103.4 mm inside diameter ${\times}$ 4.19 mm wall thickness, and is 6.36 m long, made of a zirconium alloy (Zr-2.5 wt% Nb). This provides support for the fuel while transporting the $D_2O$ heat-transfer fluid. The simple tubular geometry invites highly automated inspection, and good approach for all inspection. Similar to all nuclear heat-transfer pressure boundaries, the PHWR pressure tube requires a rigorous, periodic inspection to assess the reactor integrity in accordance with the Korea Nuclear Safety Committee law. Volumetric-based nondestructive evaluation (NDE) techniques utilizing ultrasonic and eddy current testing have been adopted for use in the periodic inspection of the fuel channel. The eddy current testing, as a supplemental NDE method to ultrasonic testing, is used to confirm the flaws primarily detected through ultrasonic testing, however, eddy current testing offers a significant advantage in that its ability to detect surface flaws is superior to that of ultrasonic testing. In this paper, effectiveness of flaw detection and the depth sizing capability by eddy current testing for the inside surface of a pressure tube, will be introduced. As a result of this examination, the ET technique is found to be useful only as a detection technique for defects because it can detect fine defects on the surface with high resolution. However, the ET technique is not recommended for use as a depth sizing method because it has a large degree of error for depth sizing.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.6 no.2
• /
• pp.57-70
• /
• 1987