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논문 : 금속연료-피복재 상호확산 거동에 미치는 기상증착법의 영향
김준환 ( Jun Hwan Kim ),이병운 ( Byoung Oon Lee ),이찬복 ( Chan Bock Lee ),지승현 ( Seung Hyun Jee ),윤영수 ( Young Soo Yoon ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.7
This study aimed to evaluate the performance of diffusion barriers in order to prevent fuel-cladding chemical interaction (FCCI) between the metallic fuels and the cladding materials, a potential hazard for nuclear fuel in sodium-cooled fast reactors. In order to prevent FCCI, Zr or V metal is deposited on the ferriticmartensitic stainless steel surface by physical vapor deposition with a thickness up to 5㎛. The diffusion couple tests using uranium alloy (U-10Zr) and a rare earth metal such as Ce-La alloy and Nd were performed at temperatures between 660~800℃. Microstructural analysis using SEM was carried out over the coupled specimen. The results show that significant interdiffusion and an associated eutectic reaction ocurred in the specimen without a diffusion barrier. However, with the exception of the local dissolution of the Zr layer in the Ce-La alloy, the specimens deposited with Zr and V exhibited superior eutectic resistance to the uranium alloy and rare earth metal.
FCCI 방지를 위한 내면 Cr 도금 피복관의 물성 평가
김준환 ( Jun Hwan Kim ),이병운 ( Byoung Oon Lee ),천진식 ( Jin Sik Cheon ),김성호 ( Sung Ho Kim ) 대한금속재료학회(구 대한금속학회) 2016 대한금속·재료학회지 Vol.54 No.11
Studies were carried out to apply electroplating technique to the inner surface of a nuclear fuel cladding tube to prevent a fuel-cladding chemical interaction (FCCI) in a sodium-cooled fast reactor (SFR). 20 μm thick Cr was uniformly plated onto the inner surface of a HT9 cladding tube with a 7.4 mm outer diameter and 0.56 mm thickness. Diffusion couple testing of simulated metal fuel (rare earth alloy) as well as tensile and burst tests were carried out, which revealed that the Cr plating exhibited good FCCI resistance as well as mechanical compatibility. In-reactor performance of Cr-plated cladding tube was performed using the HANARO research reactor, where Cr plating showed excellent FCCI resistance in spite of some local cracks. (Received February 2, 2016; Accepted April 5, 2016)
금속연료-피복재 상호확산 방지를 위한 크롬 도금법 적용 연구
김준환 ( Jun Hwan Kim ),이강수 ( Kang Soo Lee ),양성우 ( Seong Woo Yang ),이병운 ( Byoung Oon Lee ),이찬복 ( Chan Bock Lee ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.12
Studies have been carried out in order to reduce fuel-cladding chemical interaction (FCCI) behavior of metallic fuel in sodium-cooled fast reactors (SFR) using an electroplating technique. A 20㎛thick Cr layer has been plated by the electrochemical method in the Sargent bath over the HT9 (12Cr-1Mo) clad material and diffusion couple tests of the U-10Zr metallic fuel as well as the rare earth alloy (70Ce-29La) have been conducted. The results show that the Cr plating can prevent FCCI behavior along the fuel-clad interface. However, cracks developed through the thickness during plating, which resulted in the migration of some fuel constituents. Variation of bath temperature, application of pulse current, and post heat treatment have been conducted to control such cracks. We found out that some conditions like the pulse current and the post heat treatment enhanced the layer property by reducing the internal cracks and improving the diffusion couple test.
란탄족 원소와 Ferritic-Martensitic 강의 반응 거동
김준환 ( Jun Hwan Kim ),백종혁 ( Jong Hyuk Baek ),이병운 ( Byoung Oon Lee ),이찬복 ( Chan Bock Lee ),윤영수 ( Young Soo Yoon ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 대한금속·재료학회지 Vol.48 No.8
A study has been carried out to evaluate the interaction behavior between a lanthanide element and clad material in order to analyze the effect of the lanthanide element on the fuel cladding chemical interaction (FCCI). A diffusion couple test between Misch metal (70Ce-30La) and ferritic-martensitic steel (Gr.92) was performed at 660℃, followed by a microstructural analysis of the coupled sample. The results showed that Ce in the Misch metal, rather than La, reacted with the ferritic-martensitic steel (FMS) to form an interaction layer that penetrated the clad thickness. Fe diffused outside the clad interface to form an Fe2Ce compound, leaving a depletion of Fe caused by excess diffusion as well as by the formation of Cr-rich precipitation inside the interaction layer. The rate of growth followed the cubic rate law, which indicated that Fe depletion was caused by the diffusion of Fe and that the associated Cr-rich phase formation controlled the whole diffusion process.
Lee,Chul,Kuk,Myung-Ho,Lee,Byoung-Oon,Jae,Won-Mok 韓陽大學校 環境科學硏究所 1986 環境科學論文集 Vol.7 No.-
플라스틱 비적 검출기에 대한 이온화율의 함수로써의 침식율을 측정하는 방법을 설명하였다. 고체상태의 비적 검출기는 폴리아마이드를 사용했다. 비적을 형성하는 중하전 이온으로써 우라늄-238의 핵분열 생성물을 이용하였다. 직각으로 입사된 입자의 경우만 비적을 측정하였다. 침식율의 변화측정과 입자확인을 위해 비적의 반경을 측정하였다. 오랜 침식기간을 거친 뒤에 문턱영역에서의 반응곡선을 결정하였다. 반응곡선은 V=1+?? 라는 관계식으로 나타내며 β는 약 2.67이었다. 이 반응곡선에 의하여 중원소를 찾는데 도움이 될 것이다. This study describes a method for measuring the variation of the etching rate as a function of the ionization rate for polyamide nuclear detector. Polyamide sheets were used as solid state nuclear track detector. The U-238 fission fragments are used as energetic heavy ions for the track formation The evolution of etched tracks is considered only for the case of normally incident particles. The track radii are measured for the determination of the differential track etch rate and for particle identification. Response curve (etching rate ratio, V versus restricted energyloss, REL) of polyamide sheet was determined in the threshold region after a long etching period. It was found that the V(REL) curve can be well described by the relation V= 1+αREL?, where power index β is 2.67. With the response curve, it may be helpful to search heavy elements.