• Title, Summary, Keyword: 초음파검사

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Development of Ultrasonic Testing System for Piping Welds (배관 용접부 초음파검사 시스템 개발)

  • Choi, Sung-Nam;Kim, Hyung-Nam;Yoo, Hyun-Ju;Cho, Hyun-Jun;Hwang, Won-Gul
    • Journal of the Korean Society for Nondestructive Testing
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    • v.28 no.4
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    • pp.331-338
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    • 2008
  • Ultrasonic testing for welds is widely used to ensure the integrity of facilities in NPPs. Automated ultrasonic testing(AUT) is more consistent than the manual ultrasonic testing(MUT). It can scan welded parts, examines the scanned images, and saves the results as data files. AUT in NPPs is making use of commercial systems, and there has been some difficulties in calibration of the system. An AUT system is developed. It comprises of pulser/receiver, scanner and a control program(SonicWizard). The performance demonstration for piping welds in NPPs and the piping wall thickness measurement on site were conducted to verify this system. The test results of the ultrasonic testing system developed is satisfactory and effective.

Procedure Development and Qualification of the Phased Array Ultrasonic Testing for the Nuclear Power Plant Piping Weld (원자력발전소 배관 용접부 위상배열 초음파검사 절차서 개발 및 기량검증)

  • Yoon, Byung-Sik;Yang, Seung-Han;Kim, Yong-Sik;Lee, Hee-Jong
    • Journal of the Korean Society for Nondestructive Testing
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    • v.30 no.4
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    • pp.317-323
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    • 2010
  • The manual ultrasonic examination for the nuclear power plant piping welds has been demonstrated by using KPD(Korean Performance Demonstration) generic procedure. For automated ultrasonic examination, there is no generic procedure and it should be qualified by using applicable automated equipment. Until now, most of qualified procedures used pulse-echo technique and there is no qualified procedure using phased array technique. In this study, data acquisition and analysis software were developed and phased-array transducer and wedge were designed to implement phased array technique for nuclear power plant in-service inspection. The developed procedure are qualified for performance demonstration for the flaw detection, length sizing and depth sizing. The qualified procedure will be applied for the field examination in the nuclear power plant piping weld inspection.

Qualification Requirements of Ultrasonic Examination Personnel for Preservice/Inservice Inspection of Nuclear Power Plant Components (원전(原電) 가동(稼勳) 중검사(中檢査) 초음파탐상검사(超音波探傷檢査) 요원(要員)에 대한 자격인정(資格認定) 요건(要件))

  • Lee, Jong-Po
    • Journal of the Korean Society for Nondestructive Testing
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    • v.13 no.1
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    • pp.29-39
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    • 1993
  • 초음파탐상검사는 그 검사결과가 여타 비파괴검사법에 비해 검사자, 검사장비, 절차서 등 검사 시스템에의 의존도가 높으며, 이중에서도 특히 검사자의 능력과 숙련도에 크게 좌우된다. 따라서 검사결과의 신뢰도를 높이기 위해서는 무엇보다도 검사자에 대해 엄격한 자격인정(Qualification)이 필요하다. 초음파탐상검사는 원자력 발전소 기기의 가동전중검사시 가장 많이 적용하는 체적검사법으로써, 결함검출 및 평가의 신뢰도를 확보하기 위하여 최근 관련 기술기준에서는 검사자에 대해 보다 엄격한 자격인정을 요구함과 아울러 초음파탐상검사 시스템(검사자, 장비, 절차서)에 대한 기량검증(Performance Demonstration)까지를 요구하고 있다. 위의 두 가지 요건을 성공적으로 충족시킬 수 있다면, 초음파탐상기술의 신뢰도는 크게 향상될 것이다. 본고에서는 최근 보다 강화된 원전 가동전중검사 초음파탐상검사 요원의 자격인정요건에 대해 자세히 알아봄으로써 관련 국내 기술기준의 제정과 앞으로 국내 원전 초음파탐상 검사요원에 대한 본 자격인정요건의 적용에 대비코자 하였다. 한편, "초음파탐상검사 시스템에 대한 기량검증 요건"은 초음파탐상 검사요원의 자격인정 요건과 밀접한 관계가 있으므로 다음에 별도로 기술코자 한다.

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Non-destructive Test for Advanced Composite Structures (첨단복합재 구조물에 대한 비파괴 검사)

  • 진양준;한중원;김윤해
    • Journal of the Korean Society of Marine Engineering
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    • v.26 no.2
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    • pp.165-173
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    • 2002
  • 복합재부품의 제작후 검사로 적용될수 있는 방법은 방사선 투과검사와 초음파검사가 있으며, 전자는 특정 검사시에 국한되어 사용되며 그외의 검사에는 후자가 적용되는 것이 일반적이다. 복합재부품의 검사를 원활하게 수행하기 위해서는 초음파검사의 기본이론과 적용가능한 기법에 대한 이해가 필수적이다. 따라서 아래에서 초음파검사의 기본원리에 대해 간략하게 설명하고 그 실제 제작되고 있는 복합재부품에 대한 검사예를 살펴보고자 한다.

경수로형 원전의 초음파 검사 기술현황

  • 홍순신
    • Nuclear Engineering and Technology
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    • v.26 no.2
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    • pp.306-311
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    • 1994
  • 경수로형 원전의 NSSS 및 2 차계통의 주요부품에 대한 가동전. 중 검사로 수행되는 초음파 검사에 관한 내용을 수록하였다. 경수로형 원전에 적용하고 있는 초음파 검사 기술요건으로 ASME Sec. V및 XI 의 과거 10여년간의 변경과정과 검사기술, 강화된 검사 결과 기록 기준, 검사대상 및 범위에 관하여 언급하였다. 초음파검사의 신뢰성 제고를 위한 신기술의 실제 검사 적용을 유도하는 규격화의 조짐이 89년 ASME Sec. V 및 XI 규격에서 나타나고 있으며, 검사 결과의 평가 해석을 정확히 할 수 있도록 컴퓨터 화한 신호 처리 개념이 수록되어 그 요건을 살펴보았다.

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Carcinoma of the Colon and Rectum : Sonographic Findings and usefulness (Cases Review) (결직장암의 초음파검사 소견 및 유용성(증례 중심으로))

  • Jung, Hong-Ryang;Kim, Myeong-Soo;Sim, Hyun-Sun
    • Journal of radiological science and technology
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    • v.26 no.2
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    • pp.43-47
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    • 2003
  • Colorectal cancer produce focal mass or segmental thickening which can be detected with sonography. The purpose of this study was to describe sonographic findings of colorectal cancer. we reviewed sonograms of 51 patients with colorectal cancer in whom sonography was performed before colon study. In 51 patients who had more common coloretal cancer 27cases(53%) had 40 to 50 years of age(60%). Sonographic findings included segmental thickening 42cases, or irregular mass 9 cases. With careful examination, these findings can be detectable, and therefore bowel should be carefully examination in patients with sign and symptoms suggesting carcinoma of the colon and rectum.

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Performance Demonstration for Ultrasonic Examination Systems of Nuclear Power Plant Components (원전(原電) 기기(機器)의 초음파탐상검사(超音波探傷檢査) 시스템에 대한 기량(技量) 검증(檢證))

  • Lee, Jong-Po
    • Journal of the Korean Society for Nondestructive Testing
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    • v.13 no.2
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    • pp.48-60
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    • 1993
  • 1974년에 유럽에서 시작된 PISC(Program for the Inspection of Steel Components ; PISC-I, II, III) 수행결과나 1980년대초 실시된 미국의 BWR 원전 배관계통의 입계응력부식균열(IGSCC ; Intergranular Stress Corrosion Cracks)검사결과에서 나타난 바와 같이 기존의 규격 요건과 절차에 따른 원자력발전소 기기에 대한 초음파탐상검사는 그 실효성에 많은 문제점이 제기되었다. 따라서, 원전기기의 건전성 및 초음파탐상검사 결과의 신뢰도를 보증하기 위한 각종 연구가 진행되고 여러 방안이 모색되어 왔다. 그 결과, 원전 가동중검사 규격에 "초음파탐상검사자 자격인정 요건"과 "초음파탐상검사 시스템(검사자, 장비 및 절차서)에 대한 기량검증 요건"이 새로이 부가되었다. 본고에서는 초음파탐상검사 결과의 신뢰도 확보에 있어 필수불가결한 요건인 원전기기 초음파 탐상검사 시스템에 대한 기량검증 요건을 자세히 기술한다.

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A Study on the Illumination Environment of Ultrasound Examination Room (초음파 검사실의 조도 환경에 관한 연구)

  • Im, In-Chul;Lee, Hyo-Yeong;An, Hyun
    • Journal of the Korean Society of Radiology
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    • v.11 no.4
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    • pp.213-219
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    • 2017
  • The purpose of study is provide the basic data for set up proper illuminance of examination room that put purpose of an empirical study basic data about examination environment setting of the ultrasonic examination on design the examination environment of a new ultrasonic examination. As a method, to investigate the ultrasonic environment related to illumination to take a survey on the ultrasonic examination about test object to 48 parts of six units of general hospital in Busan. As a result, All Door + Curtain showed high scores in analyzing the gender, age, examination part in the case of ultrasonic examination room shielding and LED and light source control is required in the case of kind of light source. In the ultrasonic examination environment survey, the illuminance brightness is average 10 Lux which is included illuminance brightness range recommended the WHO and CEC and illuminance brightness of ultrasonic examination waiting room(ultrasonic examination waiting room, corridor) indicate average 300~800 Lux and it satisfied hospital illumination environment more than 300 Lux recommended by KSA 3011. In conclusion, Basic data suggested that improved future ultrasonic examination environment or designed new examination room on the basis of analysis result of general background and ultrasonic examination related to environment factor.

Evaluation of sonography and skin test in diagnosis of clonorchiasis at the Hyongsan-gang (River) area (형산강 유역 포항 통합시 근로자들에 있어서 간흡충 감염상 및 초음파검사와 피내반응검사의 정확도)

  • 이현경
    • The Korean Journal of Parasitology
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    • v.33 no.2
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    • pp.117-124
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    • 1995
  • This study was performed to evaluate diagnostic sensitivity and specificity of sonography on clonorchiasis. During the 9 months from March to November 1994, sonography skin test, stool examination, and medical examination were performed to 609 volunteers of Pohang which is located along the Hyongsan-gang (Rivers and is one of well-known endemic areas of clonorchiasis. The sensitivity of sonography was either 21% if the intrahepatic ducts dilatation was assumed to be the only positive anding or 52% if the periductal echogenicity was also included as one of positive findings. The sensitivity of skin test was 62%. The sensitivity was 46% if the diagnostic criteria were arbitrarily assumed as being positive in skin test and having either sonographic findings. The sonographic finding of fusiform, non-shadowing, weakly echogenic foci in gallbladder or in billiaiy tree indicating the flukes or aggregates of flukes was not obvious in this study. The specificity of sonography was either 95% if the intrahepatic ducts dilatation was assumed to be the only positive finding or 82% if the periductal echogenicity was also included as one of positive findings. The specificity of skin test was 52%. The specificity was 90% if the diagnostic criteria was arbitrarily assumed as being positive in skin test and having either sonographic findings.

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A Study on a Crack Evaluation Technique for Turbine Blade Root Using Phased Array Ultrasonics (위상배열 초음파를 이용한 터빈 블레이드 루트부내 결함평가 기법 연구)

  • Cho, Yong-Sang;Jung, Gye-Jo;Park, Sang-Ki;Kim, Jae-Hoon
    • Journal of the Korean Society for Nondestructive Testing
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    • v.24 no.2
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    • pp.151-157
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    • 2004
  • Ultrasonic testing is a kind of nondestructive test to detect a crack or discontinuity in materials or on material surfaces by sending ultrasound to it. This conventional ultrasonic technique has some limitations in reliably detecting crack or accurately assessing materials in the case of complex-shaped power plant components such as a turbine blade root. An alternative method for such a difficult inspection is highly needed. In this study, application of a phased array ultrasonic testing (UT) system to a turbine blade, one of the critical power plant components, has been considered, and the particular incident angle has been determined so that the greatest track detectability and the most accurate crack length evaluation nay be achieved. The response of ultrasonic phased array was also analyzed to establish a special method to determine the track )ength without moving the transducer. The result showed that the developed method for crack length assessment is a more accurate and effective method, compared with the conventional method.