• 한국건설관리학회논문집
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• 제19권6호
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• pp.34-45
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• 2018

원자력발전소는 총 사업비 약8.6조, 사업기간 10년 이상이 소요되는 대형 국가기반사업이며, 60년 이상 운영되는 국가경제 및 국민의 안전과 밀접한 시설이다. 따라서 설계, 건설, 운영 등 프로젝트 일련의 과정에서 정확하고 경제적 의사결정이 가능하도록 정확한 정보와 일관된 물리적 형상이 유지되어야 한다. 하지만 원전산업은 다른 산업에 비해 복잡하고 규제가 많아 일찌감치 형상관리의 중요성이 널리 인식되어왔지만, 목적과 주체가 명확하지 않아 체계적인 형상관리에 한계가 있었다. 따라서 본 논문은 많은 격실로 이루어진 APR1400을 설계요건과 형상정보를 반영한 실(Room)기반 데이터베이스 구축 방안을 제시하였다. 실 속성을 구분하는 4가지 요소를 선정하였으며, 이를 기반으로 한 데이터베이스를 활용하여 완성도 높고 체계적인 원자력발전소의 형상관리 체계 활용에 일조하고자 한다.

• Journal of Radiation Protection and Research
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• 제27권2호
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• pp.111-120
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• 2002

IAEA가 제시한 중 저준위 방사성폐기물 천층처분시설 기준 안전성평가 사례에 대해 MASCOT 프로그램을 이용하여 안전성평가를 수행하였다. 이를 위해 기준시나리오에 대한 개념 모델을 개발하였다. 지질계와 생태계의 연결매체인 우물을 동한 지하수 이동경로에 대한 평가를 수행하였고 생태계 모델에서는 구획모델을 적용하여 인간활동을 통한 최종 방사선적 영향을 평가하였으며, 다른 평가 결과와의 비교를 통해 기준시나리오에 대한 개념모델의 적합성을 조사하였다. 본 연구 결과는 구획모델을 이용한 지하수 유동경로에 대한 대표적인 개념모델을 총체적인 처분시스템의 안전성평가에 만족스럽게 이용할 수 있다는 것을 보여주었다. 또한 MASCOT 프로그램을 이용하여 복잡하고 다양한 이동경로를 통한 천층처분시설의 방사선적 안전성평가가 가능함을 보였다.

• 에너지공학
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• 제7권1호
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• pp.96-102
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• 1998

원자력 안전계통의 일부분인 컴퓨터의 사용은 일반 산업분야에서 명시되지 않은 부가적인 요건 즉 소프트웨어의 확인 및 검증, 하드웨어의 품질요건이 요구된다. 원자력 발전소에서 사용되는 컴퓨터는 컴퓨터 하드웨어, 소프트웨어, 펌웨어 및 연계장치를 포함하는 시스템이다. 원자력 안전등급을 갖는 컴퓨터 시스템을 개발하기 위해서는 우선적으로 개발환경이 요구되고 개발된 소프트웨어는 원자력 코드 및 표준에 따라 확인 및 검증되어야 한다. 이러한 요건 때문에 원자력 발전소 안전계통의 하나인 부적절노심감시계통에 대한 시험설비가 개발되었다. 시험설비는 입출력 모의설비, 자료수집계통 케비넷 및 감시컴퓨터의 3부분으로 구성된다. 이 시스템의 성능을 수동시험절차에 따라 검증되었다.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2008년도 춘계학술대회 논문집
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• pp.309-312
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• 2008

In this paper, we investigated electric safety manager's PL recognition and accident occurrence of electric power facilities(power cable, transformer, circuit breaker) in electric installation for private use. The target of questionnaire survey is 450 electric installations for private use, 154 responded the questionnaire among these and it occupied 35.8%. Most of receiving voltage were 22.900kV. The questionnaire survey says that 58% of electric safety manager knew well about PL contents and 42% of them did not recognize about PL contents, About the PL application of electrical facility accidents, 82.4% of them must applied PL law, 5.8% of them did not need the PL law. Reason of PL application occupied 64% for stability of electrical facility and product, 19% for prevention of same accident. The accident of transformer occupied most and the power cable accident were much next. The questionnaire survey results, electric safety managers are interested in PL content. thev expected necessity of PL application about electrical accident strongly.

• 한국산업융합학회 논문집
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• 제25권3호
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• pp.433-441
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• 2022

In general, in an emergency generator system for an electric facility including an induction motor load, an emergency power generation facility larger than the facility load capacity is built due to the initial starting current of the induction motor. In order to reduce this economic burden, various methods to reduce the inrush current of induction motors are applied to suppress the additional expansion of generators due to the reduction of power generation facilities and the increase in electrical facilities. Among these methods, when a system with a built-in soft start function of an induction motor using an inverter is built, it is the best way to reduce the inrush current of the induction motor to less than the rated current. However, in this case, the installation cost of the inverter to drive the induction motor increases. This paper proposes a soft start method of an induction motor by expanding the frequency and voltage control operation area of an emergency generator. In addition, proposed a speed calculation method based on power factor information, which is essential information for stable soft start of an induction motor, and a method for generating a speed command value of the governor for starting with maximum torque.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2011년도 전력전자학술대회
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• pp.504-505
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• 2011

Decreasing actual greenhouse gas will be difficult if it is not solved addressed in architectural fields. Zero emission building or zero energy building, maximize the efficiency of energy, which means the building can operate by their own renewable energy facility without any other supplying. To be a zero emission building, a building needs realization of high efficiency low energy consumption, construction of building its own energy production facilities and lastly a power grid connection. According to increasing of DC load about TV, LED lighting, computer, IT in building for living and business, it is expected the save of energy when the system of AC power distribution change into the system of DC power distribution. Renewable energy exists a big different rate produced by outside environment. When electrical power overproduce, it can supply for system. Otherwise, if electrical power produce less, it can receive supply from system. Send and receive power can lead to zero to annual standard. This paper shows the simulation about efficient control of power conversion which is related to DC power distribution of architecture and DC output of renewable energy by using L-type converter.

• 전기학회논문지
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• 제59권6호
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• pp.1011-1016
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• 2010

It is an important issue to electric power system operations that it can reliably supply large-capacity power to consumption area as due to increasing power demand growth. For this purpose, The FACTS equipment based on Power IT technology with the existing mechanical compensators has been applied to power system. Therefore we suggest on this paper that a plan for coordination control of multiple power compensation equipment in order to increase the utilization of each facility and secure operation margin capacity. As the result of simulation, it is possible to cope actively with a suddenly changed power system. This helps greatly for the voltage stability and supply reliability in a suddenly changed power system.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2001년도 추계학술대회 논문집
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• pp.343-349
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• 2001

In this study we examined the method to estimate numerically the amount of the regenerated power and the excess regenerated power produced in the DC electric power supply system for the urban light rail transit system. And their economic feasibilities are also studied. For this study DC electric power supply system is simulated and the numerical analysis of the regenerated power and the excess regenerated power are conducted. The study result on the sample system shows that the facility to consume the excess regenerated power or the inverting equipment to reuse the excess regenerated power in the electric substation is feasible economically.

• KIEE International Transactions on Power Engineering
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• 제4A권2호
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• pp.51-57
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• 2004

This paper describes the dynamic performance of a variable speed wind turbine system responding to a wide variety of wind variations. Modeling of the wind generation using power electronics interface is proposed for dynamic simulation analysis. Component models and equations are addressed and their incorporations into a transient analysis program, PSCAD/EMTDC are provided. A wind model of four components is described, which enables observing dynamic behaviors of the wind turbine resulting from wind variations. Controllable power inverter strategies are intended for capturing the maximum power under variable speed operation and maintaining reactive power generation at a pre-determined level for constant power factor control or voltage regulation control. The components and control schemes are modeled by user-defined functions. Simulation case studies provide variable speed wind generator dynamic performance for changes in wind speed

• Corrosion Science and Technology
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• 제4권6호
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• pp.242-249
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• 2005

A lot of parts in FGD (Flue Gas Desulfurization) systems of fossil-fuel power plants show the environments in which are highly changeable and extremely acidic corrosive medium according to time and locations, e.g. in duct works, coolers and re-heaters etc. These conditions are formed when system materials are immersed in fluid that flows on them or when exhausted gas is condensed into thin layered acidic medium to contact materials of the system walls and roofs. These environments make troublesome corrosion and air pollution problems that are occurred from the leakage of the condensed solution. To cathodically protect the metallic structures in extremely acidic fluid, the properties of the protective coatings on the metal surface were very important, and epoxy Novolac coating was applied in this work. On the base of acid immersion tests, hot sulfuric acid decreased the hardness of the coatings and reduced greatly the content of $Na_2O$, $Al_2O_3$, and $SiO_2$ among the main components of the coating. A special kind of CP(Cathodic Protection) system has been developed and tested in a real scale of the FGD facility. Applied coating for this CP system was peeled off and cracked in some parts of the facility. However, the exposed metal surface to extremely acidic fluid by the failure of the coatings was successfully protected by the new CP system.