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국외 원전 고장사례 분석을 통한 국내 비상디젤엔진계통 신뢰도개선 연구
조권희(Kwon-Hae Cho),최재성(Jae-Sung Choi),안수길(Soo-Kil Ahn),성게용(Key-Yong Sung),정연기(Yeon-Ki Chung) 한국마린엔지니어링학회 2004 한국마린엔지니어링학회 학술대회 논문집 Vol.2004 No.-
The reliability of Emergency Diesel Generator(EDG) System is considered one of the most important item linked directly with safety and reliability of nuclear power plants (NPPs). EDGs in NPPs adopt large medium-speed diesel engines, which were designed on the basis of marine's, and are in standby during normal plant operation. However, the failure rate of the EDGs in NPPs is not so much lower than that in the marine engines due to the peculiar operation condition such as fast start, frequent starting test, fast loading, high running load, etc. In this paper, the suggestion for reliability improvement of domestic EDGs were provided through the analysis of the failure cases in U.S.A
음향 방출에 의한 인코넬 600 합금의 응력 부식 균열 거동 평가
윤용구,김인섭,성게용 韓國非破壞檢査學會 1996 한국비파괴검사학회지 Vol.16 No.3
본 연구에서는 인코넬600 합금을 열처리 상태 및 변형속도 등이 서로 다른 SCC 발생 조건하에서 정변형 속도 시험법으로 인장시켜 그때 발생되는 AE신호와 균열 거동을 비교하므로서 SCC 발생 및 진전을 AE로서 적절히 탐지할 수 있는가를 연구하였고, AE로 탐지 가능한 초기의 최소 균열 크기를 측정하므로서 비파괴시험법으로서의 적용성을 평가하고자 하였다. 실험결과, IGSCC에서 발생되는 AE amplitude 준위는 연성파괴 및 기계적인 변형에서 발생되는 것들보다 큰 것으로 나타났으며, 이것은 AE amplitude 준위가 AE발생원을 식별할 수 있는 중요한 변수가 될 수 있음을 의미한다. IGSCC 미소균열의 성장 및 주균열의 형성으로부터 주균열의 성장으로 전환되는 시점을 AE로 적절히 감시할 수 있음을 보였으며, AE로 탐지 가능한 최소 균열 크기는 길이 200∼400㎛, 깊이 100㎛ 이하의 균열인 것으로 나타났다. 결론적으로 AE기술은 입계 응력 부식 균열의 진전을 조기 탐지할 수 있는 유용한 방법으로 평가되며 비파괴시험법으로서의 실제 적용 가능성도 높을 것으로 판단된다. Acoustic emission(AE) response during stress corrosion cracking(SCC) of Inconel 600 alloy has been monitored to study the AE detectability of crack generation and growth by comparing the crack behavior with AE parameters processed, and to evaluate the applicability as a nondestructive evaluation(NDE) by measuring the minimum crack size detectable with AE. Variously heat-treated specimens were tensioned by constant extension rate test(CERT) in various extension rate to give rise to the different SCC behavior of specimens. The AE amplitude level generated from intergranular stress-corrosion cracking(IGSCC) is higher than those from ductile fracture and mechanical deformation which means the AE amplitude can be a significant parameter for distinguishing the AE source. AE can also provide the effective means to identify the transition from the small crack initiation and formation of dominant cracks to the dominant crack growth. Minimum crack size detectable with AE is supposes to be approximately 200 to 400㎛ in length and below 100㎛ in depth. The test results show that AE technique has a capability for detecting the early stage of IGSCC growth and the potential for practical application as a NDE.
구동 전동기 입력 전류 및 전력신호에 의한 전동 게이트밸브 진단연구
박종호,이성노,성게용,조두연 충남대학교 산업기술연구소 1999 산업기술연구논문집 Vol.14 No.2
The motor-operated valves are used extensively within nuclear power plants in safety-related and balance-of-plant systems and located in almost all plant fluid systems. Their failures have resulted in significant plant maintenance efforts. More important, the operational readiness of nuclear plant safety-related systems has often been affected by MOV degradation and failure. The performance of motor-operated valves should be evaluated to ensure the nuclear safety. It will be accomplished by understanding the state of the art of the diagnostic method and developing the appropriate new methodology to evaluate the measuring parameters to predict the valve performance Measured and evaluated were the changes of the motor current signature taken by simulating the abnormal conditions on the gate MOVs used extensively in the nuclear power plants. Based on the evaluation results, the conclusion can be as follows: 1.The DC signature of motor power shows more sensitive than the current. Both of them have similar behavior during the simulation. 2.The changes of the valve stroke and magnitude with appropriate management of the signature occured during the stroke can be used as an index showing the valve failure and degradation. 3.The diagnosis of valve by simultaneous use of the valve current and power is more useful than the method using the motor current only.