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냉간가공한 오스테나이트계 강재의 극저온 특성에 미치는 Ni 및 N의 영향
최진일(J. I. Choe),주기남(K. N. Choo),강영환(Y. W. Kang) 한국표면공학회 2004 한국표면공학회지 Vol.37 No.1
Cryogenic characteristics of austenitic stainless steel based on 304 steel with nickel and nitrogen were investigated at room temperature and -196℃. The alloys were fabricated by vacuum arc furnace and cold working after homogenization treatment. The addition of nickel and nitrogen decreased the stability of δ-ferrite and induced the stability against the formation of martensite to result significantly in enhancing ductility at -196℃. Nitrogen reduced Md temperature, which was beneficial to the tensile strength and elongation at 25℃ and -196℃.
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.
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.
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.