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김영환(Y. H. Kim),이재원(J. W. Lee),박근일(G. I. Park) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.10
The wet process shearer has problems such as mass oil waste when the simulated spent fuel rods are sheared by tools, and it has low product ability because of change time of oil and tools. Also, when spent fuel rod is sheared by shearer, round shape is crushed. In order to solve these problems, simulated spent fuel rods(rod-cuts: Zry-4 tube + Al pellet) were manufactured and shearing test was conducted. Also, we selected a method of liquefied nitrogen with a roller blade for a fine circular type, and consisted of shearing module, rotation module and cooling module. We selected a nozzle spray method of cryogenic coolant on the pipe for shearing test. In the results, the problems of wet process shearer such as oil contamination and low product ability were solved by the nozzle spray method of cryogenic coolant. Also, a circular shape of shearing section was maintained by the cutting blades, nozzle splaying and lever. In the case of high speed shearing, tool life was largely affected by tool cooling than pipe cooling, if low speed of shearing, highly effective by it.
김영환(Y. H. Kim),이재원(J. W. Lee),김인태(I. T. Kim),이정원(J. W. Lee),박근일(G. I. Park) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
In this paper, in order to cut spent rod, we manufactured the simulated rod-cuts (tube+pellets), and conducted test to gain the optimum gradient value of two cutting module with gradient variance(200, 133). In results, in case of 133 gradient value, the rod-cut was splitted perfectly within 5 min/4m rod, also, split force was 201 kg and split speed was 12.5 mm/s. We obtained the optimum angle of cutter roller in capable of splitting variable PWR(Pressure Water Reactor) spent fuel rods. For this, we selected the representative PWR spent fuel rod of 6 and produced an optimum angle (32.7°) of roller using the modeling and matching method. The capacity test was conducted by using the Zircaloy fuel tube for the improvement items such as guide and splitting part and a horizontal splitter was designed.
2차원 종형 언덕 주위의 유동 및 확산현상에 관한 수치해석 연구
박근(K. Park),박원규(W. G. Park) 한국전산유체공학회 1998 한국전산유체공학회지 Vol.3 No.1
The numerical simulations of flowfield and pollutant dispersion over two-dimensional hills of various shapes are described. The Reynolds-averaged Navier-Stokes equations and concentration diffusion equation based on the gradient diffusion theory have been applied to the atmospheric shear flow over the bell-shaped hills which are basic components of the complex terrain. The flow characteristics such as velocity profiles of the geophysical boundary layer, speed-up phenomena, mean pollutant concentration profiles are compared with experimental data to validate the present numerical procedure and it has been found that the present numerical results agree well with experiments and other numerical data. It has been also found that the distributions of ground level concentration are strongly influenced by the source location and height.
2차원 종형 언덕 주위의 유동 및 확산현상에 관한 수치해석 연구
박근(K. Park),박원규(W. G. Park) 한국전산유체공학회 1998 한국전산유체공학회지 Vol.3 No.1
The numerical simulations of flowfield and pollutant dispersion over two-dimensional hills of various shapes are described. The Reynolds-averaged Navier-Stokes equations and concentration diffusion equation based on the gradient diffusion theory have been applied to the atmospheric shear flow over the bell-shaped hills which are basic components of the complex terrain. The flow characteristics such as velocity profiles of the geophysical boundary layer, speed-up phenomena, mean pollutant concentration profiles are compared with experimental data to validate the present numerical procedure and it has been found that the present numerical results agree well with experiments and other numerical data. It has been also found that the distributions of ground level concentration are strongly influenced by the source location and height.