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Performance of U 3 Si – Al dispersion fuel at HANARO full-power condition
채희택,이춘성,박종만,김희문,김연수 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.6
The irradiation performance of U3Si dispersion fuel in an Al matrix, U3Si-Al, under the Hi-Flux AdvancedNeutron Application Reactor (HANARO) design full-power condition of 30 MW was tested for full-powerqualification of the fuel. A test assembly was fabricated containing 18 fuel rods made with atomized U3Sipowder manufactured at the Korea Atomic Energy Research Institute. The test assembly was irradiatedfor 188 full-power operation days in the HANARO subject to the normal fuel-loading scheme and achievedabout 60 at% U-235 average burnup and 75 at% U-235 peak burnup. The maximum linear power ofthe test assembly was 98 kW/m. Nondestructive and destructive postirradiation examinations wereconducted. The measured postirradiation examination data were compared with data from previousirradiations and the design criteria required for HANARO fuel. Consequently, it was concluded that in-pileperformance was acceptable and fuel integrity was maintained, and the behavior satisfied the fuel designrequirements.
연구용 원자로 유입 공동에서 다공형 차폐물에 의한 와류 감쇄효과 예측
박종학(J. H. Park),채희택(H. T. Chae),박철(C. Park),김헌일(H. I. Kim) 한국전산유체공학회 2004 한국전산유체공학회지 Vol.9 No.2
CFD analysis was performed to figure out flow behavior in the inlet plenum of new research reactor where coolant is injected to the flow tubes with the fuel assembly. The computation results showed that large-scale vortices are generated in the inlet plenum by flow stream injected from inlet pipe. These vortices are divided into small vortices and reversed their revolution. They may lead to flow-induced vibration of fuel assembly, moreover, which has been regarded as a cause of fretting wear of fuel assembly. Also there is an another important thing that average velocity of each flow-tube is uneven showing difference in maximum 18%, So it has been suggested that perforated baffle will be installed to prevent the formation of vortex in the inlet plenum. Two perforated baffles, one is flow skirt and the other is muffler type flow straightener, were proposed and their effect was evaluated using commercial CFD code, Fluent. According to CFD analysis for two perforated baffles, it was confirmed that both of them can prevent or reduce vortex formation in the inlet plenum and make average velocity of each flow tube more even.
조대성,OMAR S. AL-YAHIA,RAGA’I M. ALTAMIMI,박종학,채희택 한국원자력학회 2014 Nuclear Engineering and Technology Vol.46 No.2
Heat transfer characteristics in a narrow rectangular channel are experimentally investigated for upward and downwardflows. The experimental data obtained are compared with existing data and predictions by many correlations. Based on theobservations, there are differences from others: (1) there are no different heat transfer characteristics between upward anddownward flows, (2) most of the existing correlations under-estimate heat transfer characteristics, and (3) existing correlationsdo not predict the high heat transfer in the entrance region for a wide range of Re. In addition, there are a few heat transfercorrelations applicable to narrow rectangular channels. Therefore, a new set of correlations is proposed with and withoutconsideration of the entrance region. Without consideration of the entrance region, heat transfer characteristics are expressedas a function of Re and Pr for turbulent flows, and as a function of Gz for laminar flows. The correlation proposed forturbulent and laminar flows has errors of ±18.25 and ±13.62%, respectively. With consideration of the entrance region, theheat transfer characteristics are expressed as a function of Re, Pr, and z* for both laminar and turbulent flows. The correlationfor turbulent and laminar flows has errors of ±19.5 and ±22.0%, respectively.