• 한국정밀공학회지
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• 제19권2호
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• pp.65-71
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• 2002

Turbine blade is subject to cyclic bending force by steam pressure. Stress analysis by fractography is already established technology as means far seeking cause of fracture and has been widely employed. In the X-ray frctography, plastic deformation and residual stress near the fracture surface can be determined and information of internal structure of material can be obtained. Therefore, to find a fracture mechanism of torsion-mounted blade in nuclear power plant, based on the information from the fracture surface obtained by fatigue test, the correlation of X-ray parameter and fracture mechanics parameter was determined and then the stress intensity factor to actual broken turbine blade was predicted.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1995년도 추계학술대회 논문집
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• pp.135-138
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• 1995

Recently, most of advanced materials used a wide industry field commonly have the characteristics of difficulty-to-cut materials. The cutting of difficulty-ro-cut materials have a variable optimum cutting conditions and methods according to materials. Above all,it is important of understanding to machinability of each materials. Especially, superalloy with Elevated Temperature Strength like as Incone1718 was used in nuclear power equipment and jet engine parts. This research shows a machining characteristics of Heat-Resistant alloy for high efficiency cutting through cutting force,tool wear and cutting temperature in SUS304 and Incone1718.

• 기계저널
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• 제18권4호
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• pp.13-19
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• 1978

산업계에서 용접의 역할은 근년에 와서 그 중요성이 날로 더해 가고 있다. 산업계의 발전과 동승 해서 용접이 차지하는 비중이 확대되고 여러 분야에서 금속을 결합하는 수단으로 응용되고 있는 것은 이미 알고 있는 것으로 매일매일 용접기술은 개발이 되여 현재 사용되고 있는 용접법만 하 더라도 30여종이나 된다고 하며 금속합금은 이 용접법에 의해서 만족하게 처리되고 있다고 보겠 다. 여기서 생각해 보고 싶은 것은 어떤 금속합금을 용접하여 접합할 때 여러가지 용접법중에서 어떤 방법을 어떻게 채용된 용접법의 장단점을 충분히 고려한 후에 용접작업에 들어가지 않으면 안된다. 그런데 비교적 역사가 짧은 원자력공업은 재료를 접합하는데 여러가지로 어려운 문제점 을 제공하고 있는데 이것은 비단원자력공업 뿐만이 아니고 사람들이 금속을 처음으로 만들기 시 작했을 때부터라고 생각이 든다. 이 산업의 발전은 용접기술자가 여러가지로 복잡한 문제를 어떻 게 빨리 안전하게 해결할 수 있느냐에 달려 있다고 본다. 그러므로 용접기술자는 신기한 특성을 가지고 있는 금속의 접합기술을 개발하지 않으면 안되겠지만 원자력공업에서 적용되는 아주 높은 온도에서도, 높은 압력에서도 견딜 수가 있고 중성자 충격에도 손상을 받지 않는 성질이 요구된 다. 또 실험장치등도 운전중에는 방사성이 강하기 때문에 용접의 완전성이 절실히 요구된다.

• 전기학회논문지
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• 제63권8호
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• pp.1152-1158
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• 2014

In Modern society, various important systems is operated such as nuclear plant, chemistry industry, railway system and so on. But these systems can cause high risky accidents. Hence, these systems are required to ensure the individual and societal risk criteria. In this paper, we reviewed EU risk criteria which is already operated in UK and Netherlands, then we proposed acceptable risk criteria and estimated risk of oil immersed transformer for subway with FN curve.

• 시스템엔지니어링학술지
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• 제8권2호
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• pp.47-55
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• 2012

Tsunami disaster, which ruined Japan Fukushima nuclear power plant sites in 2011 March, has raised not only the perception of that Tsunami and/or large scale flooding possibly surpass the design baselines for industry facilities and plants, but also the necessity to establish recovery system against flooding. This study suggests the framework for flooding and drainage system in compliance with flooding and drainage concept to define and identify requirements, functions, and components of the system with traceable relations. The framework with combination to CMMI engineering process is the base of corresponding high level system design.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국내학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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• pp.815-820
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• 1993

Robotic technology has been grown up conspicuously by its versatility. KAERI has been involved in one of facets of robot industry to keep abreast of rapid evolving technologies In robotic field and has launched long-term R&D plan to assure the stable nuclear energy. In this paper, the latest development status of teleoperated robot system has been presented with emphasis the configuration of overall control system with 3 dimensional graphic system that provides operators with tele-presence situation. This robot system under development, composed of master-slave arm with controller and graphic simulator, is operated by a master manipulator to enable an installation and removal operation of nozzle dam system for steam generator. Evaluation and analysis has been carried out to get optimal parameters of robot system.

• 한국생산제조학회지
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• 제22권2호
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• pp.337-341
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• 2013

In this study, fatigue crack propagation in composite material under fatigue is investigated by simulation result. When another material on the specimen exists vertically to the crack line, the phenomena that crack may go straight or propagate along the boundary face according to the elastic modulus ratio of another material to matrix are investigated with compact tension specimen by compliance method. Crack propagation direction is evaluated by compliance method. By arranging this study result systematically about the crack propagation behavior due to the stiffness of inhomogeneous material, high-tech material (automobile, aircraft and steel industry) can be improved. The estimation of safety design and life (construction & nuclear power station, etc.) will be of great value industrially.

• 산업경영시스템학회지
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• 제2권2호
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• pp.1-4
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• 1979

In order to cope with the violent environment of surrounding enterprises, development of new products, advance to other industry field, unification or abolition of factories and rationlization of labor are needed. But production process being made quality and using process after shipment are the things that we have to think about, first of all and to practice always. Insurance problem of reliability, that is, the positive quality maintenance that has being presented many debate issues recently, will be studied. The accident of nuclear power-plant in America, in connection with reliability maintenance and human engineering, will be analyzed. But as its accident details is not announced, in this study, it is a sort of method of methodology to be studied this paper rather than studying the fact of the accident. Therefore this study will be done as follows, For reliability study. 1. Investigation of problems. 2. Quality maintenance activity and reliability maintenance activity 3. Reliability acquisition in production process, 4. Reliability maintenance after shipment. 5. Conclusion. In addition to stating above, it is sure that liberalization of trade, interchange between nations and strengthening of international competition ability, etc. need high quality. But possibility that quality maintenance or reliability aquisition needs understanding and cooperation of consumer, will be stated.

• 한국전기전자재료학회논문지
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• 제20권5호
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• pp.467-470
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• 2007

Application field of neutron beam is very broad including industry, medicine and science. But the research and development and use of neutron beam is restricted within in narrow limits in this country, because neutron beam facility is insufficient - a big research facility of nuclear reactor(HANARO) and some small industrial facilities which use radioisotope neutron source are available. This paper compare and investigate the results of experiment and numerical analysis of the discharge in the spherically convergent beam fusion device which were expected as a portable neutron source. The spherically convergent beam fusion device will offer stability in neutron production, possibility of movement for convenience, low construction cost and higher neutron flux than radioisotope neutron source. The star mode discharge which efficiently generate neutron, were observed at both results.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.110-114
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• 2008

Determination of weld-induced residual stress has been an important issue in nuclear power industry because several failures were reported in dissimilar metal weld parts due to primary water stress corrosion cracking. In this context, a couple of remarkable round robin analyses were conducted to quantify the welding simulation variables and to establish optimized numerical analysis process. The purpose of the present research is to introduce welding simulation results for a safety and relief nozzle, which has a dissimilar metal weld part as well as a similar metal weld part. First, finite element analyses are carried out to calculate residual stresses at the inside of nozzle considering only dissimilar metal welding. Subsequently, residual stresses taking into account both the dissimilar and similar metal welding are computed. The similar metal weld effect is evaluated by compa