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강경준(Kyung Jun Kang),김영인(Kim Young In),김긍구(Kim Keung Koo) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The SCS(Shutdown Cooling System) plays a role to cool down the reactor from the hot shutdown condition to the refueling temperature, and maintains the RCS(Reactor Coolant System) refueling condition. The SCS consists of two independent trains with a 100% capacity each, and each train is designed to be sufficient to remove the decay heat from reactor. This study is to evaluate capacity of the heat exchanger of shutdown cooling system.
이재선(Jae-Seon Lee),김종인(Jong-In Kim),김지호(Ji-Ho Kim),박홍윤(Hong-Yune Park),김긍구(Keung-Koo Kim) 한국트라이볼로지학회 2004 한국트라이볼로지학회 학술대회 Vol.38 No.-
Water-lubrication ball bearings are. required to install in aqueous medium where water is used as coolant or working fluid. However water-lubricated frictional characteristics of stainless steel ball bearing is not well known compared to oil-lubricated frictional characteristics. Furthermore study on friction at high temperature is rare because bearing maintenance strategy for water-lubricated or chemicals-lubricated bearings of equipment is mostly based on change of failed bearings and parts. Ball bearings and ball screws are installed on the power transmission for a developing integral reactor and these are lubricated with high temperature and high pressure chemically-controlled water. Bearings and power transmitting mechanical elements for an atomic reactor needs high reliability and high performance during estimated lifetime, and their performance should be verified. In this paper, experimental research results of frictional characteristics of water-lubricated ball bearing are reported.
Static Instability of a Once-Through Steam Generator with a Modular Feedwater Line
Jae-Kwang Seo(서재광),Han-Ok Kang(강한옥),Juhyeon Yoon(윤주현),Keung-Koo Kim(김긍구) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Static flow instability of a once-through steam generator (OTSG) with a modular feedwater line is an instability related to the change of a flow direction in individual steam generating U-shaped channels operating at a given pressure difference. The nature of the static instability is close to a Ledinegg instability [1] related to the presence of multiple flows at the full hydraulic curve of a U-shaped channel. In this paper, the conditions for a reverse flow for the OTSG with a U-shaped modular feedwater line (MFL) are studied. From the results of the studies, it is revealed that the change of a flow direction in the MFL is due to a boiling of the feedwater in the downcomer branch of the U-shaped MFL and that multiple flows start in an area of the extremes corresponding to the minimum pressure difference of the hydraulic curves. Calculation models for predicting a threshold of a static instability for the OTSG of interest is proposed and the analysis results are compared with the experimental data.