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사용후핵연료 심층처분을 위한 지하연구시설(URL)의 필요성 및 접근 방안
배대석,고용권,이상진,김현주,최병일,Bae, Dae-Seok,Koh, Yong-Kwon,Lee, Sang-Jin,Kim, Hyunjoo,Choi, Byong-Il 한국방사성폐기물학회 2013 방사성폐기물학회지 Vol.11 No.2
사용후핵연료 최종처분을 위해 심층처분은 세계적으로 가장 선호되는 방법이다. 이를 위해 선진국들은 자국 여건에 가장 잘 부합되는 고유의 처분시스템 개발에 주력하고 있거나, 일부 확보하여 상용처분사업에 적용하고 있다. 현재까지 알려진 대부분의 심층처분시스템은 공학적 및 천연방벽으로 구성된 다중방벽시스템이다. 이들 처분시스템은 수 천 년 ~ 수 십만 년 이상의 성능기간이 대하여 성능 안전성의 입증이 확인되어야 후속 상용처분사업에 적용 가능하다. 입증 현안과제들은 처분시스템의 상능 안전성 확보를 위해 수행되는 모든 행위 즉, 조사, 분석, 해석, 평가, 설계, 건설, 운영 및 폐쇄에 이르는 전 과정에 있어서 추진 과정과 결과에 대한 실현 가능성과 실증에 필요한 내용들이 해당된다. 이를 위해 대부분의 선진국들은 자국내 분포하는 대표적인 선호암종 지역에서 지하연구시설(URL)을 건설하여 실증 시연프로그램을 수행하거나 완성단계에 있다. 이 과정과 결과들은 후속되는 최종처분장 부지선정 과정에 평가기준으로 활용될 것이며, 최종처분시설의 성능 안전성평가에 필수적으로 적용하게 된다. 지하연구시설은 또한 규제-일반대중-전문가 등 다양한 이해당사자들로 하여금 심층처분의 안전성 수준에 대한 이해제고와 토론의 마당으로서 핵심적인 역할과 기능을 할 것으로 기대된다. This study gives a conceptual and basic direction to develop a URL (underground research laboratory) program for establishing the performance and safety of a deep geological disposal system in Korea. The concept of deep geological disposal is one of the preferred methodologies for the final disposal of spent nuclear fuel (SNF). Advanced countries with radioactive waste disposal have developed their own disposal concepts reasonable to their social and environmental conditions and applied to their commercial projects. Deep geological disposal system is a multi-barrier system generally consisting of an engineered barrier and natural barrier. A disposal facility and its host environment can be relied on a necessary containment and isolation over timescales envisaged as several to tens of thousands of years. A disposal system is not allowed in the commercial stage of the disposal program without a validation and demonstration of the performance and safety of the system. All issues confirming performance and safety of a disposal system include investigation, analysis, assessment, design, construction, operation and closure from planning to closure of the deep geological repository. Advanced countries perform RD&D (research, development & demonstration) programs to validate the performance and safety of a disposal system using a URL facility located at the preferred rock area within their own territories. The results and processes from the URL program contribute to construct technical criteria and guidelines for site selection as well as suitability and safety assessment of the final disposal site. Furthermore, the URL program also plays a decisive role in promoting scientific understanding of the deep geological disposal system for stakeholders, such as the public, regulator, and experts.
과대팽창이 발생하는 초음속노즐의 충격파 구조와 추력성능에 대한 수치적 연구
배대석(Dae Seok Bae),최현아(Hyun Ah Choi),감호동(Ho Dong Kam),김정수(Jeong Soo Kim) 한국추진공학회 2014 한국추진공학회지 Vol.18 No.4
Overexpanded flow of an axisymmetric thruster nozzle is numerically simulated to investigate effects of nozzle pressure ratio (NPR) on the shock structure and thrust performance. The Reynolds-averaged Navier-Stokes equations with k- SST turbulence model are solved utilizing FLUENT solver. As the NPR is raised, thrust performance monotonically increases with the shock structure and flow-separation point being pushed toward the nozzle exit. It is also discussed that the flow structure at nozzle-exit plane which is immediately affected by a position of nozzle-interior shocks and expansion waves, has strong influence upon the thrust performance of thruster nozzle.
배대석,권오붕,김현호,Bae Dae Seok,Kwon Oh Boong,Kim Hyun Ho 한국마린엔지니어링학회 2005 한국마린엔지니어링학회지 Vol.29 No.2
In an inclined enclosure with the upper part cooled and the lower part heated, quantitative data of the temperature and velocity are obtained simultaneously using thermo-sensitive liquid crystals. Experimental results are Presented for Pr=909. aspect ratios of 1/14. 2/14 and 3/14, angle of inclination, 0$\leq$$\theta$$\leq$45 to the horizontal line. The numerical results are obtained in the same conditions as experiments by the finite volume method and its results are compared with experimental results. It is found that the number of cell is decreased with increasing the angle of inclination. and a unicell is formed at nearby 6=30$^{circ}$ which is not affected by the aspect ratio.
배대석,Bae, Dae-Seok 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.11
Particle Image Thermometry(PIT) with liquid crystal tracers is used for visualizing and analysis of the bubbly flow in a vertical temperature gradient. Quantitative data of the temperature were obtained by applying the color-image processing to a visualized image, and neural-network was applied to the color-to-temperature calibration. This paper describes the method, and presents the transient mixing temperature patterns of the bubbly flow.
정상초음파의 교란을 받는 메탄 - 공기 예혼합화염의 전파특성에 대한 초음파 구동 주파수의 영향
배대석(Dae Seok Bae),서항석(Hang Seok Seo),김정수(Jeong Soo Kim) 대한기계학회 2015 大韓機械學會論文集B Vol.39 No.2
정상초음파장의 구동 주파수가 메탄-공기 예혼합화염의 전파특성에 미치는 영향을 규명하고자 하는 실험결과를 제시한다. 고속카메라를 이용하여 화염의 전파영상을 획득하였으며, 영상 후처리를 통해 화염선단의 구조와 속도변이를 포함하는 화염의 거시적 거동을 상세히 관찰하였다. 정상초음파가 연소 반응을 촉진시켜 화염 전파속도의 증대와 화염선단 구조의 변이를 유발한다는 사실에 더하여, 초음파 구동 주파수와 당량비에 대한 화염거동의 종속성을 확인하였다. An experimental study was conducted to scrutinize the influence of the frequency of an ultrasonic standing wave on the variation in the behavior of a methane-air premixed flame. The evolutionary features of the propagating flame were captured by a high-speed camera, and the macroscopic flame behavior, including the flame structure and local velocities, was investigated in detail using a post-processing analysis of the high-speed images. It was found that a structural variation and propagation-velocity augmentation of the methane-air premixed flame were caused by the intervention of the ultrasonic standing wave, which enhanced the combustion reaction. Conclusive evidence for the dependency of the flame behaviors on the driving frequency of the ultrasonic standing wave and equivalence ratio of the reactants is presented.
배대석(Dae Seok Bae),김남식(Nam Shik Kim) 한국마린엔지니어링학회 2003 한국마린엔지니어링학회 학술대회 논문집 Vol.2003 No.-
The Particle Image Velocimetry(PIV) with liquid crystal tracers is used for visualizing and analysis of bubbly flow in a stratified temperature environment. This method allows full field temperature and flow analysis. In the present work, the temperature measurement of bubbly flow is studied by the application of liquid crystal thermometry. The performance of color-to-temperature transformation of the thermochromic liquid crystals is evaluated by using the calibration technique with neural networks. The measured temperature distributions indicate the temperature mixing characteristics of bubbly flow. This paper describes the neural network calibration method, and presents the transient temperature patterns of bubbly flow.