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하나로 원자로에 설치될 대향 이상 열사이펀 루프에 관한 실험
황권상,조만순,성형진,Hwang, Kwon-Sang,Cho, Man-Soon,Sung, Hyung-Jin 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.8
An experimental study was carried out to delineate the flow characteristics in a closed countescurrent two-phase thermo syphon with concentric tubes. This is to be installed in the HANARO research reactor as a part of a Cold Neutron Source(CNS). In the present investigation, experiments ata room temperature with Freon-II3 as a moderator were performed. Results show that, based on the magnitude of pressure fluctuation, the flow regimes could be divided into 4 distinct ones in the ($V_f,\;Q_i$) plane, where $V_f$ represents the volume of the charged liquid and $Q_i$ the heat load: a stable flow regime, an oscillatory flow regime, a restablized flow regime and a dryout flow regime. For $V_f$>2.5l, the flow is stable at low $Q_i$. However, as $Q_i$ increases, the flow becomes oscillatory and finally restablizes As $V_f$ increases, the oscillation amplitude decreases, reaching to the restablized flow region at low $Q_i$, and the liquid level in the moderator cell remains high. In the oscillatory flow regimes, for a fixed VI; the oscillating period of time varies with $Q_i$, having a minimum value at a certain value of $Q_i$. The heat load, where the oscillating period of time is minimum, decreases as $V_f$ increases.
중성자 조사에 따른 SiC Schottky Diode의 전기적 특성 변화
김성수,강민석,조만순,구상모,Kim, Sung-Su,Kang, Min-Seok,Cho, Man-Soon,Koo, Sang-Mo 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.4
The effect of neutron irradiation on the properties of SiC Schottky Diode has been investigated. SiC Schottky diodes were irradiated under neutron fluences and compared to the reference samples to study the radiation-induced changes in device properties. The condition of neutron irradiation was $3.1{\times}10^{10}$ $n/cm^2$. The current density after irradiation decreased from 12.7 to 0.75 $A/cm^2$. Also, a slight positive shift (${\Delta}V_{th}$= 0.15 V) in threshold voltage from 0.53 to 0.68 V and a positive change (${\Delta}{\Phi}_B$= 0.16 eV) of barrier height from 0.89 to 1.05 eV have been observed by the neutron irradiation, which is attributed to charge damage in the interface between the metal and the SiC layer.
벨로우즈를 이용한 반복 하중부과장치의 개발 및 성능시험
최명환(M.H. Choi),조만순(M.S. Cho),김봉구(B.G. Kim),김학노(H.R. Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
A fatigue capsule is one of the special capsules to investigate the fatigue characteristics of the nuclear materials in a research reactor, HANARO. In this study, the performance test and the preliminary fatigue test results by using a cyclic load device newly developed for a fatigue capsule are described. In order to obtain the characteristics such as a realization and a controllability of the periodic wave shape and the relation between the pressure and the load, a spring and rigid bar specimens are used. The fatigue test for the STS 316L specimen with 1.8㎜ in diameter and 12.5㎜ in gage length is also performed under the same conditions as the temperature(550℃) of the specimen during irradiation tests. As a result of the test, the fracture of the specimen occurs at a total of 127,865 cycles (22 days), and the displacement is 2.63㎜. It is expected that these results will be used for a determination of test conditions and a comparison of the in-pile fatigue test results.
원추형 하단부 구조를 갖는 캡슐의 하나로와의 양립성시험
최명환(M.H. Choi),조만순(M.S. Cho),주기남(K.N Choo),박승재(S.J. Park),김봉구(B.G. Kim),강영환(Y.H. Kang) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The design modification of bottom guide structures of the instrumented capsule, which is used for the irradiation test in the HANARO reactor, was required because of the trouble of the bottom guide arm's pin during irradiation. The previous structure with 3-pin arms was changed into the cone shape of one body. The specimens of the bottom end cap ring with three different sizes (φ68/70/72mm) were designed and manufactured. The out-pile tests for the capsule with previous and new three bottom guide structures were performed in the one-channel flow test facilities. In order to evaluate the compatibility with HANARO and the structural integrity of the capsule, a loading/unloading, a pressure drop, a thermal performance, a vibration, and an endurance test were conducted. From out-pile test results, the capsule with the cone shape bottom guide structures was found to be more stable than the previous structure and the optimized size of the bottom guide structure selected was 70mm in diameter. It is expected that the new bottom guide structures will be applicable to all material and special capsules which will be designed and manufactured for the irradiation tests in the future.
중성자 조사한 4H-SiC MOSFET의 열처리에 의한 전기적 특성 변화
이태섭,안재인,김소망,박성준,조슬기,주기남,조만순,구상모,Lee, Taeseop,An, Jae-In,Kim, So-Mang,Park, Sung-Joon,Cho, Seulki,Choo, Kee-Nam,Cho, Man-Soon,Koo, Sang-Mo 한국전기전자재료학회 2018 전기전자재료학회논문지 Vol.31 No.4
In this work, we have investigated the effect of a 30-min thermal anneal at $550^{\circ}C$ on the electrical characteristics of neutron-irradiated 4H-SiC MOSFETs. Thermal annealing can recover the on/off characteristics of neutron-irradiated 4H-SiC MOSFETs. After thermal annealing, the interface-trap density decreased and the effective mobility increased in terms of the on-characteristics. This finding could be due to the improvement of the interfacial state from thermal annealing and the reduction in Coulomb scattering due to the reduction in interface traps. Additionally, in terms of the off-characteristics, the thermal annealing resulted in the recovery of the breakdown voltage and leakage current. After the thermal annealing, the number of positive trapped charges at the MOSFET interface was decreased.
Ag계/Ni계 용가재를 이용한 STS 304L과 Inconel 600의 브레이징에 관한 연구
심규택(Kyue-Taek Shim),주기남(Kee-Nam Choo),조만순(Man-Soon Cho),박승재(Sung-Jae Park),김재훈(Jae-Hoon Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
This study was carried out to develop the joining technology by nicro-brazing of STS 304L tube and the thermocouple of Inconel 600 sheath, which is used as an instrument for high-temperature irradiation in HANARO. BAg-1 and BNi-7 were used as filler materials, and AMCO 446 was selected as flux in the brazing. For evaluation of solidity of the joining, the tensile strength and the micro hardness were measured. Both the brazings of STS 304L and Inconel using BAg-1 and BNi-7 filler materials were joined firmly. Some spot flaws were found at the joining places using BNi-7 filler material, however, they turned out not to affect the strength of the materials.
최명환(M.H. Choi),강영환(Y.H. Kang),조만순(M.S. Cho),김봉구(B.G. Kim),손재민(J.M. Sohn),주기남(K.N. Choo) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
An instrumented capsule has been used for an irradiation test of various nuclear materials in the research reactor, high-flux advanced neutron application reactor, HANARO. In this study, in order to estimate the results of an irradiation test for the material capsule and to obtain the preliminary design data of the new conceptual capsule using a liquid thermal media, the thermal analysis is performed by using a 2D model for each cross section including specimens. As a result of the tests and analyses, the maximum temperature at the reactor power of 24㎿ is 255℃ for an irradiation test and 260℃ for an FE analysis in the middle stage of the capsule. Also, from the comparison of the results for the capsule with Al and LBE thermal media, it is found that the conceptual design of a LBE capsule will meet the test requirements for a high temperature irradiation of new materials in the HANARO reactor.
최명환(Choi, M.H.),주기남(Choo, K.N.),조만순(Cho, M.S.),김봉구(Kim, B.G.) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.12
The bottom structure of an instrumented capsule is a part which is joined at the receptacle of the flow tube in the reactor in-core. A geometrical change of the bottom structure has an effect on the pressure drop and the vibration of the capsule. The out-pile test to evaluate the structural integrity of the material capsule called 04M-17U was performed by using a single channel and a half core test loop. From the pressure drop test, the optimized diameter of the cone shape's bottom structure which satisfies HANARO's flow requirement (19.6 kg/s) is 71 mm. The maximum displacement of the capsule measured at the half core test loop is lower than 1.0 mm. From the analysis results, it is found that the test hole will not be interfered with near the flow tubes because its displacement due to the cooling water is very small at 0.072 mm. The fundamental frequency of the capsule under water is 9.64 Hz. It is expected that the resonance between the capsule and the fluid flow due to the cooling water in HANARO's in-core will not occur. Also, the new bottom structure of a solid cone shape with 71 mm in diameter will be applicable to the material and special capsules in the future.