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김광표,김현석,Kim, Kwang-Pyo,Kim, Hyun-Seok 한국진공학회 2017 진공 이야기 Vol.4 No.1
Recently, KSTAR, Korea's superconducting fusion energy research and development device, has succeeded in driving the high performance plasma for 70 seconds for the first time in the world. Continuous plasma operation technology is an essential factor for commercialization of fusion energy power generation. Therefore, this achievement is expected to play a major role in the research of fusion technology required for future fusion power plants. In order to operate the KSTAR, the discharge process in which the neutral gas is turned into the plasma should be preceded in the start-up (breakdown) phase of tokamak operation. This process essentially involves the vacuum environment in the tokamak device. KSTAR has successfully operated a vacuum pumping system to achieve the target level of the vacuum environment through a high temperature baking operation, a discharge cleaning process and boronization.
김광표,이원근,김종수,윤여창,윤석철,Kim, Kwang-Pyo,Lee, Won-Keun,Kim, Jong-Su,Yoon, Yeo-Chang,Yoon, Suk-Chul 대한방사선방어학회 1996 방사선방어학회지 Vol.21 No.1
중성자 및 전자 그리고 광자 수송코드인 MCNP 4A코드를 이 용하여 ANSI N13.32에 제안된 말단팬텀과 한국원자력연구소 제작한 말단팬텀 각각에 대하여 감마선량당량환산인자를 커마근사법에 근거하여 계산하였다. 본 계산은 $15keV{\sim}1.5MeV$ 에너지영역에 대해 단일광자에너지 선원을 고려하였으며 이러한 단일광자에너지함수로서 계산한 공기커마에 대한 선량당량의 비로서 선량당량환산인자를 이론적으로 도출하였다. 본 연구에서 이론적 방법으로 도출한 ANSI와 KAERI의 말단팬텀 각각에 대한 광자선량당량환산인자를 ANSI N13.32의 실험적 방법에 의해 제시된 값들과 비교한 결과 50keV 이상의 단일 광자에너지영역에서는 실험적 방법에 의한 값들과 최대차이 5.7% 내에서 잘 일치함을 보였다. 그러나 40 keV 이하의 에너지영역에서는 본 연구의 계산 결과가 최대 13.6%까지 낮게 평가됨을 알 수 있었으며, 이러한 차이는 낮은 에너지영역에서 두드러지는 단일에너지의 생성과 관련된 실험의 불확실성과 MCNP코드에서 모사한 Geometry의 영향에 기인하는 것으로 사료된다. In this study, the theoretical calculation of the air kerma-to-dose equivalent conversion factors was performed with a Monte Carlo N-Particle transport code for the two types of extremity phantom of the ANSI and the KAERI, respectively. Considering the distribution of absorbed dose due to the interaction of homogeneous Parallel broad beam of monoenergetic primary photons in the range between 15keV and 1.5MeV, the air kerma-to-dose equivalent conversion factors based on the kerma approximation were calculated. It is showed that all the theoretical conversion factors of the two types of the extremity phantom for the ANSI and the KAERI agree well with the experimental values of the ANSI N13.32 draft(1995) for each energy within 5.7%, maximum difference ratio, except for 13.6%, difference ratio in the case for the energy of less than 40keV. It is due to uncertainties of experiment occurred in the low X-ray energy range and geometry considered in the MCNP code.
KSTAR PFC GN<SUB>2</SUB> BAKING SYSTEM 의 최적설계와 운전결과에 관한 연구
김상태(Kim Sang Tae),김영진(Kim Young Jin),정남용(Jung Nam Yong),임동석(Im Dong Seok),김광표(Kim Kwang Pyo),방은남(Bang Eun Nam),김경민(Kim Kyung Min),김양수(Kim yang Su),권면(Kwon Myeun),유성연(Yoo Seong Yeon) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
PFC nitrogen gas (GN<SUB>2</SUB>) baking system is a closed-loop system and consists of a compressor (nitrogen gas), a electric heater, a pre-cooler (gas vs. gas), a cooler (gas vs. water), a vacuum pump, etc. The system has the following characteristics: 1)Because the compressor cannot be operated at 350℃, the cooler is installed at its suction pipe in order to keep its suction gas temperature below 90℃; 2) The high temperature nitrogen gas fed into the PFC source an energy from compression heat of the compressor and heat retrieved of the pre-cooler to reduce the heaters capacity and those become saving operational energy highly; 3) The heater power is regulated by the temperature of the heater outlet gas through feedback control. For the heating operation in the fourth campaign, the temperature of GN<SUB>2</SUB> supplied was raised to 300℃; PFC temperature reached 250℃. This paper describes the optimum design of PFC GN<SUB>2</SUB> baking system and its operating results.
리포트 - 원전 주변 주민과 갑상선암 발생에 관한 과학적 분석
김교윤,강건욱,금동권,김봉환,김광표,김병일,서성원,진영우,김수근,김현정,안형식,조건우,박우윤,Kim, Gyo-Yun,Gang, Geon-Uk,Geum, Dong-Gwon,Kim, Bong-Hwan,Kim, Gwang-Pyo,Kim, Byeong-Il,Seo, Seong-Won,Jin, Yeong-U,Kim, Su-Geun,Kim, Hyeon-Jeong,An 한국원자력산업회의 2015 원자력산업 Vol.35 No.8
원전 주변 주민의 갑상선암 발생에 원전의 영향이 있다는 부산지법 동부지원의 판결(2014.10.17.) 이후 원자력학회와 방사선방어학회는 학술적 사실에 입각한 보고서를 작성하기로 하고 금년 1월부터 과학계와 의학계의 전문 학자로 구성된 보고서 발간위원회(공동위원장 김교윤, 박우윤)를 구성하여 6월에 '원전 주변 주민과 갑상선암 발생에 관한 보고서'를 발간하였으며, 보고서의 내용을 쉽게 일반 국민에게 설명할 기회가 필요하다는 의견에 따라 지난 9월에는 보고서 설명회를 개최한 바 있다. 설명회에서 보고서 발간 참여 전문가들은 방사선 과학 및 의학과 역학 전문 연구분야에서 학술적인 접근을 통해 방사선과 갑상선암과의 상관 관계를 진단한 결과 정상적으로 운영되고 있는 원전과 주변 주민의 갑상선암 발생 사이에는 인과 관계가 없다고 판단했다고 강조했다. 본고는 보고서의 내용을 요약한 것이다.
전자기적 발열에서의 KSTAR In-Vessel Control Coil의 열 및 기계적 거동
강진구(Jin Gu Kang),박성현(Sunghyun Park),장민용(Minyoung Jang),이현정(Hyunjung Lee),김현욱(Hyun Wook Kim),이근수(KunSu Lee),김광표(Kwang Pyo Kim),박갑래(Kaprai Park),김범석(Beom Seok Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
To settle fusion technology, technical- and engineering challenges should be solved to control unstable fusion plasma. In-vessel control coil (IVCC) in Korea Superconducting Tokamak Advanced Research (KSTAR) has been implemented for plasma control. We characterize the mechanical behaviors of IVCC under high heat-generation environments due to electrically induced eddy currents. Numerical evaluations reveal electromagnetic-, thermal- and mechanical responses under operating conditions. Thermal stability is assessed in terms of transient temperature variations and consequent thermal stress distributions. Experimental approaches using IVCC mock-up models are employed to validate the numerical results. We suggest candidates reduce eddy current and guarantee heat-dissipating performance via tailored methods with an upgrade of the IVCC case. The preliminary results will be the fundamental data for feasible upgrade of IVCC in KSTAR.
전자기적 발열에서의 KSTAR In-Vessel Control Coil의 열 및 기계적 거동
강진구(Jin Gu Kang),박성현(Sunghyun Park),장민용(Minyoung Jang),이현정(Hyunjung Lee),김현욱(Hyun Wook Kim),이근수(KunSu Lee),김광표(Kwang Pyo Kim),박갑래(Kaprai Park),김범석(Beom Seok Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
To settle fusion technology, technical- and engineering challenges should be solved to control unstable fusion plasma. In-vessel control coil (IVCC) in Korea Superconducting Tokamak Advanced Research (KSTAR) has been implemented for plasma control. We characterize the mechanical behaviors of IVCC under high heat-generation environments due to electrically induced eddy currents. Numerical evaluations reveal electromagnetic-, thermal- and mechanical responses under operating conditions. Thermal stability is assessed in terms of transient temperature variations and consequent thermal stress distributions. Experimental approaches using IVCC mock-up models are employed to validate the numerical results. We suggest candidates reduce eddy current and guarantee heat-dissipating performance via tailored methods with an upgrade of the IVCC case. The preliminary results will be the fundamental data for feasible upgrade of IVCC in KSTAR.