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안효준,박재형,송창현,이정익,김용희,김성중 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.3
In contrast to all-time flooded small modular reactor (SMR) systems, an in-kind flooding safety system (FSS) has been proposed as a passive safety system applicable to small modular reactors (SMRs) that adopt a metal containment vessel (MCV). Under transient conditions, the FSS can provide emergency cooling to dry reactor cavities and sustain long-term coolability using re-acquired evaporated steam in the reactor building on demand. When designing an FSS, the effect of the flooding flow area is vital as it affects the overall accident sequence and safety. Therefore, in this study, a MELCOR model of a reference SMR is developed and numerical analysis is performed under postulated accident scenarios. Without flooding, the MCV pressure of the reactor module exceeds the design pressure before core damage. To prevent core damage, an emergency flooding strategy is devised using various flow path parameters and requirements to ensure an adequate emergency coolant supply before the core damage is investigated. The results indicate that a flow area exceeding 0.02 m2 is required in the FSS to prevent MCV overpressure and core damage. This study is the first to report a strategic analysis for appropriately sizing an FSS flooding valve applicable to innovative SMRs.
안효준 국립경상대학교 공과대학 부설 첨단소재연구소 1993 尖端素材 Vol.3 No.-
In order to study the phase changes of ErFe₂by hydrogenation reaction, static and cyclic hydrogenation were performed. During the static isothermal hydrogenation, an amorphous hydride phase is observed at about 200℃, and phase decomposition of stable hydride, ErH₂and Fe at 350℃. Hydrogen absorption-desorption cycling results in a decrease in the reversible hydrogen content with increasing number of cycles. As a result of degradation, amorphous of mixed ErH₂and Fe phases are formed. The heat of hydrogenation and repetitive strain induce a phase decompositiobn. Amorphous hydride phase formation as wel as binary stable hydride is one of the possible degradation mechanism of the metal hydride during cyclic operation.
안효준 국립경상대학교 공과대학 부설 첨단소재연구소 1994 尖端素材 Vol.4 No.-
In recent years a small sealed Ni/MH battery for cordless appliances has been extensively studied. The MH electrode characteristics were dependent on the fabrication method of alloys. The hydrogenation behavior of Ti-Ni powders prepared by mechanical alloying in a high energy ball mill have been investigaed by P-C-Isotherm curves, DSC(Differential Scanning Calorimetry), X-ray diffractometer, SEM(Scanning Elertron Microscope). Amorphous TiNi phase was formed 10 milling hours. The hydrogen storage capacity gradually decreased as a function of mechanical alloying time. There appears the DSC endothermic peak due to hydrogen evolution of amorphous hydride phase.