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RISS 인기검색어
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- 저자 : 문성보 ( Sung Bo Moon ) (검색결과 6 건)
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발생인자 분석을 활용한 한국형 핵융합 실증로의 사고시 방사능 선원항 발생량 분석
문성보(Sung Bo Moon),김범석(Beom Seok Kim),홍석호(Suk-Ho Hong) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
Safety issues of every nuclear power plants are primary obstacle that engineers must hurdle to ensure the licensing phase in the plant design stages. After Fukushima accident, concerns about nuclear power plants make this safety obstacle harsher. To deal with this tendency, safety assessment should be done before it arises as main problem when it gets to the construction permission stage. As a first step of this safety assessment study, radioactive source term as accident occurs must be quantified in conservative way. Because the Korean fusion demonstration plant design is not confirmed, most of design features will use other DEMO references like EU DEMO. Radioactive dust and tritium are main source term in fusion reactor safety analysis. Multiplication factor is assumed to be proportional to the total amount of source term. Factors that affect to the amount of source term are defined and using this multiplication factor, total amount of radioactive dust and tritium are calculated.
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문성보 ( Sung Bo Moon ),박성대 ( Seong Dae Park ),방인철 ( In Cheol Bang ) 한국액체미립화학회 2014 한국액체미립화학회 학술강연회 논문집 Vol.2014 No.-
Graphene Oxide(GO) has benefit of high solubility with water base solutions because of chemical characteristics of GO. Through the process of heating graphene oxide nanofluid with electrically direct heating, GO is reduced to Reduced Graphene Oxide (RGO). The reduction process changes the characteristic of graphene oxide and affination between water and GO nanoparticle. The inherent chemical characteristics of GO makes different CHF values for different GO nanofluid pool boiling experiments. This research is a review of results show that CHF values of graphene oxide nanofluid experiment has twice bigger than pool boiling using distilled water. We analyzed and compared the CHF value, porosity, permeability (Liter & Kaviany CHF enhancement correlation) of surface coating and Scattering Electron Microscope (SEM) images to validate Liter-Kaviany CHF correlation. In the Liter & Kaviany CHF mechanism, the porosity and permeability affect the driving force to the liquid being supplied to the heater surface. The porosity value had good agreement, compared with SEM images.
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나노유체 : 수조비등 환경에서 나노입자 코팅두께에 따른 임계열유속 결과의 실험적 연구
박성대 ( Seong Dae Park ),문성보 ( Sung Bo Moon ),방인철 ( In Cheol Bang ) 한국액체미립화학회 2012 한국액체미립화학회 학술강연회 논문집 Vol.2012 No.-
Since nanofluids, which are colloidal dispersions of nanoparticles in a base fluid such as water, were known as a way to significantly enhance the CHF, the pool boiling CHF test was conducted in a variety conditions depending on the material, the concentration etc. The concentration is the factor which influences the amount the coating materials on the heater surface. In most papers which are reporting the results of the pool boiling CHF test for nanofluids, the exact heating time is not described according to the heat flux level. The heating time is also an important factor that determines the amount of coated material. Alumina nanofluid is prepared by dispersing nanoparticles into the distilled water as a base fluid. The concentration of nanofluid is 0.01Vol%. Pre-coating process was carried out from 1 to 180 minutes at 600kW/m2. Heating time affects CHF positively in the region of a relatively short pre-coating time. The trend of CHF change is slowly decreased as pre-coating time is incrased. When more nanoparticles are coated on the heater surface but not heat transfer area is limited, the heat resistance which is disturbing the heat flow is increasing. The static contact angle was measured for sessile droplets of pure water (1μl) at 25℃ in air on the clean and nanoparticles coated surfaces boiled in nanofluids. The dramatic decrease of contact angle was observed on the coated heater surface. The results of contact angle are not uncovering the slight decrease of CHF in high pre-coating region. Hydrodynamic instability theory has been known as model of Zuber who proposed initially. The nanoparticle-coated surface has a shorter average distance compared with a bare surface. A case of high pre-heating time has a short wavelength in this work. A short wavelength allows to the vapor to prevent the formation of bulk vapor by venting the vapor equally across the heater surface. But the results of wavelength are not similarly uncovering the slight decrease of CHF in high pre-coating region. Coating thickness was measured by analyzing the SEM images. The thickness is continually increased but the gradient is becoming gentle. Reversely, porosity is decreased as the pre-boiling time is longer. It means that the coating layer formed by nanoparticles is becoming dense. It is clear the coating layer functions as a heat transfer resistance.
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나노유체 : 임계열유속 및 사고 저항성 증진을 위한 크로미아 나노유체 활용
손규민 ( Gyu Min Son ),서한 ( Han Seo ),문성보 ( Sung Bo Moon ),서석빈 ( Seok Bin Seo ),방인철 ( In Cheol Bang ) 한국액체미립화학회 2015 한국액체미립화학회 학술강연회 논문집 Vol.2015 No.-
Hydrogen explosion can threaten the safety of nuclear power plants as shown in Fukushima accident. When zircaloy (fuel cladding) is oxidized, it generates hydrogen and oxidation speeds up at high temperature. The concept of accident-tolerant-fuel (ATF) aims for enhanced safety response, mitigating oxidation of fuel claddings during accident and chrome coating on zircaloy surface shows promising results in this regard. By forming Cr2O3 (chromia or chrome oxide) layer on the outermost surface when oxidized, it prevents further oxidation inwards. However chrome coatings show some limitations since it forms hydrophobic surface and damages critical heat flux (CHF). Instead, direct coating of chromia layer is proposed in this study. Chromia coating on nichrome wire was done by boiling deposition of chromia nanofluid. Chrome coating with PVD was also prepared for comparison. Pool boiling experiment results show that chromia coated wire’s CHF is approximately twice of bare and chrome coated wires. For explanation of CHF enhancement, contact angle was compared showing chromia coating has hydrophilic surface. To ensure that direct coating of chromia has oxidation resistance, samples are oxidized in furnace and weight gain was compared.
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Preliminary Study on Evaluation Affecting Licensibility of a Nuclear Fusion Demonstration Reactor
Beom Seok Kim(김범석),Suk-ho Hong(홍석호),Sung Bo Moon(문성보) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The first cradle of international cooperative nuclear fusion research based on the International Thermonuclear Experimental Reactor (ITER) project is approaching. While the securing of fusion physics and engineering technology is being attempted, much attention is being paid to implementation of a nuclear fusion demonstration reactor beyond ITER. This study intends to discuss the necessity of securing a regulatory-based environment, which will be an essential factor for the timely settlement of a fusion demonstration reactor, and securing the technical foundation required to develop nuclear fusion technology. Based on differences from commercialized nuclear reactors, predictable hazard analysis, and the expected acceptability of radioactive waste from the fusion reactor, we discuss significant issues with a sense of safety for securing acceptance in our society. Herein, we present a preliminary evaluation on whether nuclear fusion technology is compatible with the current nuclear regulatory framework.
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