• Nuclear Engineering and Technology
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• 제41권6호
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• pp.813-820
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• 2009

A rapid pneumatic transfer system (PTS) for an instrumental neutron activation analysis (INAA) is developed as an automatic irradiation facility involving the measurement of a short half-life nuclide and a delayed neutron counting system. Three new PTS designs with improved functions were constructed at the HANARO research reactor in 2006. The new system is composed of a manual system and an automatic system for both an INAA and a delayed neutron activation analysis (DNAA). The design and basic conception of a modified PTS are described, and the functions of system operation and control, radiation protection and emissions of radioactive gas are improved. In addition, a form of capsule transportation of these systems is tested. The experimental results pertaining to the irradiation characteristics with variation of the neutron flux and the temperature of the irradiation position with the irradiation time are presented, as is an analysis of the reference material for analytical quality control and uncertainty assessments.

• 대한토목학회논문집
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• 제29권5D호
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• pp.627-634
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• 2009

최근 국내에서 많이 시행되고 있는 BTL(Build Transfer Lease)사업은 수익성이 낮은 문화, 교육, 복지부문의 사회기반시설을 조기에 확충함으로써 국민들의 삶의 질을 높여주는 역할을 한다. 그러나 현재까지 BTL사업의 공사비는 초기공사비에 중점을 두고 있으며, 상대적으로 운영비 산정에 대한 합리적 기준이 정해져 있지 않아 비효율적인 낮은 운영비 관리체계가 되고 있다. 저가 운영비는 사업완공 후 시설 운영시 서비스의 질을 저하할 수 있고, 사업의 성과에도 큰 영향을 미친다. 따라서 본 연구에서는 기존 하수처리시설의 운영부문에 대한 실적자료를 이용하여 사업계획 초기에 운영비와 운영인력을 산정하는 방안을 제시한다. 이러한 연구는 향후 BTL사업으로 시행되는 하수처리시설의 계획시 시설 규모에 따른 개략적인 운영비 산정에 활용성을 갖을 것으로 기대되며, 타 시설물의 BTL사업 운영비 산정체계 구축시 참고 자료가 될 수 있다.

• 대한토목학회논문집
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• 제28권4D호
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• pp.533-538
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• 2008

KTX(Korea Train Express)의 도입은 우리나라 교통시스템 전반에 획기적인 변화를 가져왔다. 특히 고속철도역은 단순한 철도역이 아닌 통합적인 대중교통 환승센터로 그 의미가 확장되고 있다. 그러나 그동안 고속철도역에 대한 평가가 제대로 이루어지지 못한 것이 사실이다. 고속철도역의 평가는 출발지에서 고속철도역까지의 연계와 내부의 환승 서비스에 대한 평가가 매우 중요하다. 본 연구에서는 고속철도역 내부 환승시설의 서비스 평가를 위하여 표준화된 지표를 개발하였다. 서비스 평가지표는 환승시설의 서비스수준(LOS), 시설배치의 적정성, 정보수준으로 이루어진다. 서비스 평가지표를 활용하여 고속철도역 환승시설에 대한 평가지표별 평가 기준과 방법론을 제시하였다. 최종적으로, 현재 이용 중인 전국의 7개 고속철도역을 평가해 보았다.

• 교육녹색환경연구
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• 제14권1호
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• pp.1-9
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• 2015

정확한 공사비 추정은 성공적인 프로젝트의 개발에 필수적이다. BTL 사업과 같이 민간투자사업에 있어서 정확한 공사비 산정은 효과적인 예산확보와 파이낸싱에 필수적인 기본 정보가 된다. 공사비 견적의 정확도에 따라 입찰과 제안서의 정확도가 반영되므로 프로젝트를 통한 수익성 여부와 사업타당성을 확보할 수 있다. 본 연구는 정확한 공사비 분석과 활용을 위한 기초적인 연구로써 10년 정도 경과한 초 중등학교 민간투자사업(BTL)의 건축공사비를 분석하여 여러 참여주체들별로 공사를 할 수 있는 건축공사의 공종별 분포비율을 학교급별로 파악한다. 즉, 초 중등학교의 건축 공종별 구성비율을 전체 평균비율, 초등학교, 중학교, 고등학교별로 살펴보고 향후 유사한 공사를 수행하는 경우에 참여주체별로 활용할 수 있도록 하고자 한다.

• Nuclear Engineering and Technology
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• 제37권4호
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• pp.385-390
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• 2005

The effect of the Wolsong Tritium Removal Facility on the change of tritium concentration in the soil water was assessed by introducing a dynamic compartment model. For the mathematical modeling, the tritium in the environment was thought to come from two different sources. Three global tritium cycling models were compared with the natural background concentration. The dynamic compartment model was used to model the behavior of the tritium from the nuclear power plants at the Wolsong site. The source term for the dynamic compartment model was calculated with the dry and wet deposition rates. The area around the Wolsong nuclear power plants was represented by the compartments. The mechanisms considered in deriving the transfer coefficients between the compartments were evaporation, runoff, infiltration, hydrodynamic dispersion, and groundwater flow. We predicted what the change of the tritium concentration around the Wolsong nuclear power plants would be after future operation of the tritium removal facility to show the applicability of the model. The results showed that the operation of the tritium removal facility would reduce the tritium concentration in topsoil water quickly.

• Nuclear Engineering and Technology
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• 제55권9호
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• pp.3164-3182
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• 2023

The CRUD on the fuel cladding under the pressurized water reactor (PWR) operating condition causes several issues. The CRUD can act as thermal resistance and increases the local cladding temperature which accelerate the corrosion process. The hideout of boron inside the CRUD results in axial offset anomaly and reduces the plant's shutdown margin. Recently, there are efforts to revise the acceptance criteria of emergency core cooling systems (ECCS), and additionally require the modeling of the thermal resistance effect of the CRUD during the performance analysis. There is an urgent need for the evaluation of the effect of the CRUD deposition on the cladding heat transfer under PWR operating conditions, but the experimental database is very limited. The experimental facility called DISNY was designed and constructed to analyze the CRUD-related multi-physical phenomena, and the performance analysis of the constructed DISNY facility was conducted. The thermal-hydraulic and water chemistry conditions to simulate the CRUD growth under PWR operating conditions were established. The design characteristics and feasibility of the DISNY facility were validated by the MARS-KS code analysis and separate performance tests. In the current study, detailed design features, design validation results, and future utilization plans of the proposed DISNY facility are presented.

• International Journal of Naval Architecture and Ocean Engineering
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• 제7권6호
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• pp.964-978
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• 2015

Numerous experiments with a scaled pilot facility were carried out to compare the relative bulk transfer performance of three special devices for applications to drilling systems. The pipe diameter for bulk transportation was 3 in., which corresponds to around half of the actual system dimensions. Two different pressures, 3 and 4 bar, were considered to check the relative performance under different pressure conditions at a bulk storage tank. And to make a practical estimation method of the bulk transfer rate at the early design stages of the bulk handling system, a series of experiments were conducted for real scaled bulk handing systems of two drilling vessels. The pressure drops at each pipe element as well as the bulk transfer rates were measured under different operating conditions. Using the measured results, the friction factor for each pipe element was calculated and a procedure for transfer rate estimation was developed. Compared to the measured transfer rate results for other drilling vessels, the estimated transfer rates were within a maximum 15% error bound.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2004년도 추계학술대회
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• pp.1219-1224
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• 2004

The objective of this study is to propose an experimental calibration facility in which a heat flux sensor can be calibrated under conductive condition by using helium gas. The heat flux calibration facility was designed, simulated and manufactured for use in a high heat transfer condition. It delivers heat fluxes up to a maximum of 35 KW $m^{-2}$. A copper block heated electrically with 3.5 KW power is designed to produce uniform temperature up to 600 K across its face. High heat fluxes are provided between hot plate and cold plate by 1 mm height helium filled gap. A cold plate is maintained around 300 K through pool boiling using a refrigerant and water-cooled heat exchanger. A simulation was conducted to verify the design of the main test section. To verify the performance of calibration facility, a heat flux sensor was examined. The measured heat fluxes were compared to the calculated one.

• 대한안전경영과학회지
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• 제22권2호
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• pp.7-13
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• 2020

Sludge incineration facilities are socially recognized as a hate facility. Therefore, a careful deodorization plan must be established. Therefore, the incineration facility must conduct research on odor ventilation. In this study, a odor diffusion simulation in an incineration facility was conducted and analyzed. In particular, research was carried out on carry-in rooms, pre-treatment rooms, and storage facilities for crops, which are expected to rapidly spread odor. As a result, ammonia 1.62, hydrogen sulfide 0.63, and acetaldehyde 0.73 were found in the transfer room. In addition, pretreatment rooms and stencil storage facilities were found to be lower than regulatory standards.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2002년도 추계학술대회논문초록집
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• pp.364.2-364
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• 2002

Thermoacoustic oscillation, which stems from phase correlation between unsteady heat release and acoustic fluctuation, can cause severe vibration and incite the excessive local heat transfer inside the rocket engine. It is very important to understand and prevent this phenomenon in the way of rocket engine development. In this study, the propulsion test facility of KSR-III, which is the first liquid propellant rocket developed by KARI, will be introduced. and the characteristics of thermoacoustic ocillation occurred at the facility will be examined.