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연구 리포트 - 직접 처분 방식의 후행 핵연료주기의 경제성
임만성,조석기,Im, Man-Seong,Jo, Seok-Gi 한국원자력산업회의 2016 원자력산업 Vol.36 No.2
탈원전, 원자력 에너지의 계속적인 이용, 한반도의 통일 등 다양한 변수들은 한국의 직첩 처분 기반의 후행 핵연료주기의 경제성에 영향을 미칠 수 있다.
변현호,임만성 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.12
A pool scrubber is often used as a wet-type design to mitigate the consequence of a severe nuclear accident. While studies indicated higher decontamination performance of a deeper pool, utilizing a very tall pool can be problematic due to potential structural stability and water backflow issues. This study proposes, as an alternative to a single pool system, a pool scrubber system composed of serially connected multiple pools with lower heights. Since large fraction of aerosol removal takes place in the injection region, serially connected pool scrubber system is expected to enhance the overall decontamination capability of a pool scrubber system. To support the analysis of the proposed system's decontamination capability, a new computer model was developed in the study to describe the bubble size dependent effect on aerosol removal including the effect of pool residence time. The accuracy of the new model was examined against experimental data for its validation. The proposed scrubber system composed of serially connected multiple shorter pools is found to have much improved decontamination performance over the current single pool system design.
김필서,조소빈,임만성 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.8
According to the Renewable Energy 3020 Implementation Plan announced in 2017 by the South Korean government, the electricity share of renewable energy will be expanded to 20% of the total electricity generation by 2030. Given the intermittency of electricity generation from renewable energy, realization of such a plan presents challenges to managing South Korea's isolated national electric grid and implies potentially large excess electricity generation in certain situations. The purpose of this study is: 1) to develop a model to accurately simulate the effects of excess electricity generation from renewables which would arise during the transition, and 2) to propose strategies to manage excess electricity generation through effective utilization of domestic electricity generating capabilities. Our results show that in periods of greater PV and wind power, namely the spring and fall seasons, the frequency of excess electricity generation increases, while electricity demand decreases. This being the case, flexible operation of coal and nuclear power plants along with LNG and pumped-storage hydroelectricity can be used to counterbalance the excess electricity generation from renewables. In addition, nuclear energy plays an important role in reducing CO2 emissions and electricity costs unlike the fossil fuel-based generation sources outlined in the 8th Basic Plan
정영은,안성규,임만성 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.2
During the pyroprocessing operation, various signals can be collected by process monitoring (PM). Thesesignals are utilized to diagnose process states. In this study, feasibility of using PM for nuclear safeguardsof electrorefining operation was examined based on the use of machine learning for detecting off-normaloperations. The off-normal operation, in this study, is defined as co-deposition of key elements throughreduction on cathode. The monitored process signal selected for PM was cathode potential. The necessary data were produced through electrodeposition experiments in a laboratory molten salt system. Model-based cathodic surface area data were also generated and used to support model development. Computer models for classification were developed using a series of recurrent neural network architectures. The concept of transfer learning was also employed by combining pre-training and fine-tuningto minimize data requirement for training. The resulting models were found to classify the normal andthe off-normal operation states with a 95% accuracy. With the availability of more process data, theapproach is expected to have higher reliability
AZNAN FAZLI ISMAIL,임만성 한국원자력학회 2015 Nuclear Engineering and Technology Vol.47 No.5
To support the use of nuclear power as a sustainable electric energy generating technology,long-term supply of uranium is very important. The objective of this research is toinvestigate the use of new adsorbent material for cost effective uranium extraction fromseawater. An activated carbon-based adsorbent material is developed and tested throughan electrosorption technique in this research. Adsorption of uranium from seawater byactivated carbon electrodes was investigated through electrosorption experiments up to300 minutes by changing positive potentials from þ0.2V to þ0.8V (vs. Ag/AgCl). Uraniumadsorption by the activated carbon electrode developed in this research reached up to 3.4 g-U/kg-adsorbent material, which is comparable with the performance of amidoxime-basedadsorbent materials. Electrosorption of uranium ions from seawater was found to be mostfavorable at þ0.4V (vs. Ag/AgCl). The cost of chemicals and materials in the presentresearch was compared with that of the amidoxime-based approach as part of the engineeringfeasibility examination.