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사용후핵연료 저장 캐니스터 구조물인 바스켓 디스크간 간극의 매질 종류 및 크기에 따른 열전달 연구
강경욱(G.U. Kang),육대식(D.S. Yook),차정훈(J.H. Cha) 한국전산유체공학회 2018 한국전산유체공학회지 Vol.23 No.3
This study investigates numerically the heat transfer effects on gap media and size between the basket and disc in the spent fuel dry storage canister using Fluent 14.5 code. For helium gas, helium solid and stainless steel in media, maximum temperatures of fuel region were measured by varying the heights and width of gap, and the heat transfer phenomena in the gap were described in detail. It is found that the maximum temperature of fuel region is kept low in case the width of the gap is narrowed at the fixed heights of disc. Setting the medium to helium solid in the range of 2 to 10 mm leads to the similar results for the helium gas regardless of the disc heights, and the less time is required for convergence. From these results, it is considered that the medium of the gap may be applied as a helium solid rather than the helium gas in order to increase the efficiency of thermal analysis in terms of heat removal. The results of this study will be used as the theoretical basis for the thermal analysis methodology of the spent fuel dry storage system.
사용후핵연료 건식저장 캐니스터 내부 금속 구조물 설계특성에 따른 열전달 영향
강경욱(G.U. Kang),육대식(D.S. Yook) 한국전산유체공학회 2019 한국전산유체공학회지 Vol.24 No.3
Heat transfer influences by design characteristics of metal structures inside a spent fuel canister were numerically investigated using a FLUENT 14.5 code with a simplified thermal model. The maximum temperature at a fuel region became lower in case of small gaps, increasing the number of discs because the heat transfer inside the canister was dominated by the conduction between metals structures rather than the natural convection by a helium flow. When the number of discs increased, the similar results were obtained with helium, even if the gap media was applied with the stainless steel rather than helium. In addition, the time required for the analysis was effectively shorten. These results will be used as the theoretical basis in terms of the thermal design on structures inside the dry storage cask.