http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
High Cooling Water Temperature Effects on Design and Operational Safety of NPPs in the Gulf Region
김병구,정용훈 한국원자력학회 2013 Nuclear Engineering and Technology Vol.45 No.7
The Arabian Gulf region has one of the highest ocean temperatures, reaching above 35 degrees and ambient temperaturesover 50 degrees in the summer. Two nuclear power plants (NPP) are being introduced in the region for the first time, one atBushehr (1,000 MWe PWR plant from Russia), and a much larger one at Barakah (4X1,400 MWe PWR from Korea). Bothplants take seawater from the Gulf for condenser cooling, having to modify the secondary/tertiary side cooling systems designby increasing the heat transfer surface area from the country of origin. This paper analyses the secondary side of a typicalPWR plant operating under the Rankine cycle with a simplified thermal-hydraulic model. Parametric study of ocean coolingtemperatures is conducted to estimate thermal efficiency variations and its associated design changes for the secondary side. Operational safety is reviewed to deliver rated power output with acceptable safety margins in line with technicalspecifications, mainly in the auxiliary systems together with the cooling water temperature. Impact on the Gulf seawater as theultimate heat sink is considered negligible, affecting only the adjacent water near the NPP site, when compared to the solarradiation on the sea surface.
김병구 대한기계학회 1982 大韓機械學會誌 Vol.22 No.3
우리나라는 1978 년 고리 1호기의 가동을 효시로 고리, 월성, 영광, 울진에 8기의 원자력발전소를 건설중에 있고 앞으로도 후속기의 착공이 계속될 전망이다. 노형별로 보면 월성1호기가 카나다 에서 개발된 가압식중수로(pressurized water reactor, PWR형)이다. 이 두 노형의 가장 큰 차이 점은 천연우라늄과 농축우라늄을 각각 사용한다는 핵주기상의 차이에 있고 따라서 핵연료집합 체의 구조와 노심관리상에는 큰 차이가 있다. 본 해설을 현재 우리나라에서는 건설되고 있는 PWR형과 CANDU형 원자로 핵연료를 중심으로 이들 각각의 구조, 설계, 재질상의 특성과 지금 까지 밝혀진 핵연료 파혼현상을 고찰하고 이를 대비한 시험평가분야를 검토함으로써 앞으로 다 가올 핵연료 국산화 시대에 도움이 되리라 믿는다.
김병구,김기환,정한주,이경구,이태호 한국연초학회 1996 한국연초학회지 Vol.18 No.1
Flue-cured tobaccos(cv. NC82, grade AB3O-1) expanded by super steam, volatile organic solvents(tricuorofluoromethane, propane), carbon dioxide, nitrogen, and by freeze-drying were examined for their physico-chemical properties. The expanding rate by using the organic solvents or carbon dioxide at the impregnated pressure was 70% or more, whereas the rate by super steam and freeze-drying was 49.4 and 42.9%, respectively. The contents of total sugar, alkaloid and ether extracts of the expanded tobacco by organic solvents or carbondioxide were decreased to 27.6, 20% or more, and 13%, respectively, when compared to non-expanded one. The contents of citric acid of the tobacco expanded by using trichlorofluoromethane and carbon dioxide were increased to 19.1, 14.0%, respectively. Linoleic acid in the tobacco expanded by super steam or trichlorofluoromethane was also increased to 17.3%, but malonic acid in the tobacco expanded by super steam was 18.5% less than that in the non-expanded one. Nineteen essential oil among 22 assayed in this experiment were decreased in the expanded tobaccos. Key words : expanding method, tobacco, physico-chemical properties.