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서영수(Y. S. Seo),임우섭(W. S. Lim),정희택(H. T. Chung) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This study introduces the seismic qualification of safety related equipments for nuclear power plants to verify the possibility of resonance and the structural integrity due to external piping nozzle loads as well as seismic dynamic loads using El-Centro earthquake, which was occurred in the 1940's previously. As a first step, it is necessary to investigate the natural frequency of the mixed flow pump in order to determine whether static or dynamic equipment comparing with seismic cut-off frequency, 33hz. Also the normal mode analysis was carried out with the introduction of seismic restraint at the middle of vertical pump to increase natural frequency. In terms of design structural integrity, the application of static analysis with normal, upset and faulted nozzle loads event was presented for the comparison of material allowable stress. Also the dynamic analysis was performed to show the investigation of design adequacy when the effects of application on east-west, north-south, vertical El-Centro earthquake.
최재욱,하동명,목연수,임우섭,최일곤,조태제 한국산업안전학회 1999 한국안전학회지 Vol.14 No.3
This study was accomplished by measuring the lower and upper flash point with air blowing method and grasping the characteristics of flammability for the three component systems, which are made up of the Benzene-Toluene-o-Xylene and Methylethylketone-Toluene-o-Xylene. These three component systems are widely used in the various industrial fields together with the development of industry. The results are as follows ; 1) Isothermal line is plotted on the triangular diagram for flash points determined in each solutions. From this line, the mixed compositions which indicated the same lower and upper flash points in each different composition could be read on this diagram, if the composition of mixtures are known. 2) Lower and upper explosion limits obtained from the flash points determined for the three component solution are compared with the value calculated from Le Chatelier's law. Especially the lower explosion limits are in a good agreement with the calculated values.