[en] The purpose of this study is to examine the storage proplem of spent fuel at nuclear power plants which may occur sometime in early 1990's and to fine out the best option for spent fuel management by the evaluating both technical and ecomomical aspects. In this study 3 scenaios have been evaluated: 1) once-through fuel cycle, 2) reprocessing outside our country and 3) reprocessing inside our country. Spent fuel arisings from nuclear power plants by 2000 have been calculated by using SCENARIOS program which was obtained from IAEA. Various storage options inculding rod consolidation at reactor and away from reactor storage have been analyzed mainly based on information which has been supplied U.S. DOE and Pacific Northwest Lab(PNL). This study has been performed as a part of U.S./Korea Joint Spent Fuel Study which was agreed between MOST of Korea and U.S. DOS/DOE in June, 1982. As an agreement, U.S. PNL and KAERI will primary carry out joint study under the guidance of both governments by the end of 1983. As a result of first yesr study, thermal recycle option with domestic reprocessing at around 2000 will be economically feasible comparing with once-through option. Due to the uncertainties and storage of reprocessing facilities in the world, thermal recycle option will toll reprocessing will not be feasible and most expensive, according to examination carried out by KEPCO and KAERI through this year. (Author)