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염학기,박만흥,Yeom, Hak-Gi,Park, Man-Heung 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.2
In this paper, the unsteady state calculational model is proposed for the thermal stratification analysis in the feedwater line of the PWR plant. By defining dimensionless parameters in the two-dimensional polar coordinate system and applying SIMPLE algorithm, the temperature and flow profiles due to the thermal stratification are obtained. Base on the fact that the most significant condition occurs when the fluid temperature difference between the piping ends reaches as high as 166.deg. C, the present result shows that max. Dimensionless temperature difference of 0.6 (about l00.deg. C) obtained between hot and cold sections of pipe wall at dimensionless time 47.0.
정일석,김유,염학기,박만흥,Jung, I,S,,Kim, Y.,Youm, H.K.,Park, M.H. 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.4
In this paper, the unsteady two dimensional model for the thermal stratification in the pressurizer surge line of PWR plant has been proposed to numerically investigate the heat transfer and flow characteristics. The dimensionless governing equations are solved by using the Control Volume Formulation and SIMPLE (Semi-Implicit Method for Pressure Linked Equations) algorithm. The temperature profile of fluids and pipe wall with time are shown when the thermal stratification occurs in the horizontal pipe. The numerical result shows that the maximum dimensionless temperature difference is about O.514 between hot and cold section of pipe wall at dimensionless time 1,632.
이강용,김종성,배정일,진태은,염학기,홍승열,정일석,김유,Lee, Kang-Yong,Kim, Jong-Sung,Bae, Jung-Il,Jin, Tae-Eun,Youm, Hak-Ki,Hong, Seong-Yul,Jeong, Il-Suk,Kim, Yoo 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.8
The procedure for the determination of the residual life of the pressurizer surge line nozzle in the nuclear plant is developed. The design fatigue life for the 1800 $ft^3$ pressurizer surge line nozzle in cast head design is compared with that of Westinghouse stress report, and the percentage difference between two results is less than 9%. The design fatigue life evaluation of the 1000 $ft^3$ pressurizer surge line nozzle in fabricated head design is carried out, and the consuming rate and residual life are estimated using the operating data.