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Microstructure Analysis for Chemical Interaction between Cesium and SUS316 Steel in Fast Breeder Reactor Application 被引量:2
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作者 Koei Sasaki Takanori Tanigaki +2 位作者 Tomohiro Oshima Ken-ich Fukumoto Uno Masayoshi 《Journal of Energy and Power Engineering》 2013年第4期716-725,共10页
The objective of this study is to presume cesium corrosion process and its dominant factors in SUS316 steel, a fuel cladding material for fast breeder reactor application, based on both experimental results of cesium ... The objective of this study is to presume cesium corrosion process and its dominant factors in SUS316 steel, a fuel cladding material for fast breeder reactor application, based on both experimental results of cesium corrosion out-pile test and thermodynamic consideration. The cesium corrosion test was performed in simulated environment of high burn-up fuel pin. And main corrosion products in the specimen after the corrosion test were specified by TEM (transition electron microscopy) and SEM (scanning electron microscopy) in order to formulate a hypothesis of the cesium corrosion process. At the end of this study, it was found that the dominant factors of the corrosion process are the amount of cesium on the surface of the specimen, chromium content in the alloy, the supply rate of oxygen and temperature. 展开更多
关键词 FBR (fast breeder reactor) fcci fuel clad chemical interaction cesium corrosion out-pile test SUS316 steel liquid-metal corrosion.
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Formation of intermetallic compound at interface between rare earth elements and ferritic-martensitic steel by fuel cladding chemical interaction 被引量:1
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作者 Jun Hwan Kim Byoung Oon Lee +2 位作者 Chan Bock Lee Seung Hyun Jee Young Soo Yoon 《Journal of Rare Earths》 SCIE EI CAS CSCD 2012年第6期599-603,共5页
The intermetallic compounds formation at interface between rare earth elements and clad material were investigated to demonstrate the effects of rare earth elements on fuel-cladding chemical interaction (FCCI) behav... The intermetallic compounds formation at interface between rare earth elements and clad material were investigated to demonstrate the effects of rare earth elements on fuel-cladding chemical interaction (FCCI) behavior. Mischmetal (70Ce-30La) and Nd were prepared as rare earth elements. Diffusion couple testing was performed on the rare earth elements and cladding (9Cr2W steel) near the operation temperature of (sodium-cooled fast reactor) SFR fuel. The performance of a diffusion barrier consisting of Zr and V metallic foil against the rare earth elements was also evaluated. Our results showed that Ce and Nd in the rare earth elements and Fe in the clad material interdiffused and reacted to form intermetallic species according to the parabolic rate law, describing the migration of the rare earth element. The diffusion of Fe limited the reaction progress such that the entire process was governed by the cubic rate law. Rare earth materials could be used as a surrogate for high burnup metallic fuels, and the performance of the barrier material was demonstrated to be effective. 展开更多
关键词 intermetallic compound sodium-cooled fast reactor (SFR) metallic fuel fuel-cladding chemical interaction fcci rare earths BARRIER
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MOX燃料与包壳化学相互作用研究进展 被引量:1
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作者 韩华 汤琪 程焕林 《装备环境工程》 CAS 2024年第7期159-168,共10页
简要介绍了MOX燃料芯块微观组织特点和主要裂变产物行为及其对化学相互作用层的影响,归纳总结了国内外对化学相互作用层微观结构的研究进展,分析了现有研究的不足和仍待解决的问题,以期对我国未来MOX燃料的研究和应用提供部分参考。
关键词 MOX燃料 包壳 化学相互作用层 中子辐照 燃料包壳间隙 裂变产物 微观结构
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First-principles study on the diffusion behavior of Cs and I in Cr coating
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作者 Shu-Ying Lin Xiao-Jing Li +4 位作者 Lin-Bing Jiang Xi-Jun Wu Hui-Qin Yin Yu Ma Wen-Guan Liu 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2024年第6期177-188,共12页
Cs and I can migrate through fuel-cladding interfaces and accelerate the cladding corrosion process induced by the fuel-cladding chemical interaction.Cr coating has emerged as an important candidate for mitigating thi... Cs and I can migrate through fuel-cladding interfaces and accelerate the cladding corrosion process induced by the fuel-cladding chemical interaction.Cr coating has emerged as an important candidate for mitigating this chemical interaction.In this study,first-principles calculations were employed to investigate the diffusion behavior of Cs and I in the Cr bulk and grain boundaries to reveal the microscopic interaction mitigation mechanisms at the fuel-cladding interface.The interaction between these two fission products and the Cr coating were studied systematically,and the Cs and I temperature-dependent diffusion coefficients in Cr were obtained using Bocquet’s oversized solute-atom model and Le Claire’s nine-frequency model,respectively.The results showed that the Cs and I migration barriers were significantly lower than that of Cr,and the Cs and I diffusion coefficients were more than three orders of magnitude larger than the Cr self-diffusion coefficient within the temperature range of Generation-IV fast reactors(below 1000 K),demonstrating the strong penetration ability of Cs and I.Furthermore,Cs and I are more likely to diffuse along the grain boundary because of the generally low migration barriers,indicating that the grain boundary serves as a fast diffusion channel for Cs and I. 展开更多
关键词 First-principles calculation fuel cladding chemical interaction Cr coating Fission product DIFFUSION Grain boundary
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快中子反应堆的FCCI分析与预测
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作者 许咏丽 张其欣 +1 位作者 龙斌 李军刚 《核科学与工程》 CSCD 北大核心 1997年第2期150-156,共7页
根据快堆裂变产物行为的动力学模型和燃料元件包壳氧化腐蚀的机理,选取燃料初始O/M比、燃耗和包壳内壁温度作为自变量,以6个国家的堆内试验参数和82个FCCI测量值为样品数据,用神经网络扩展δ算法拟合出这些变量与FCCI... 根据快堆裂变产物行为的动力学模型和燃料元件包壳氧化腐蚀的机理,选取燃料初始O/M比、燃耗和包壳内壁温度作为自变量,以6个国家的堆内试验参数和82个FCCI测量值为样品数据,用神经网络扩展δ算法拟合出这些变量与FCCI深度值间的非线性映射关系式。以该方法计算的FCCI深度和相应的堆内FCCI测量值作对比,得出计算值与测量值的相符率、计算值的均方差及其置信度,明显优于现有FCCI经验方程。用该方法分析预测了CEFR设计参数下的FCCI深度。 展开更多
关键词 快堆 包壳 化学相互作用 神经网络 fcci
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压水堆完整和破损燃料棒燃料包壳化学相互作用层拉曼特征分析 被引量:3
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作者 王华才 程焕林 +4 位作者 宋武林 郭丽娜 汤琪 郭一帆 杨启法 《原子能科学技术》 EI CAS CSCD 北大核心 2023年第3期619-629,共11页
为研究压水堆完整和破损燃料棒燃料包壳化学相互作用(FCCI)层物相结构组成及影响因素,通过拉曼光谱对燃耗为45 GW·d/tU和41 GW·d/tU的完整和破损燃料棒FCCI层进行了研究分析。结果表明:完整燃料棒形成了周向厚度为14~19μm的F... 为研究压水堆完整和破损燃料棒燃料包壳化学相互作用(FCCI)层物相结构组成及影响因素,通过拉曼光谱对燃耗为45 GW·d/tU和41 GW·d/tU的完整和破损燃料棒FCCI层进行了研究分析。结果表明:完整燃料棒形成了周向厚度为14~19μm的FCCI层,主要由两个不同相结构区域组成,分别为靠近包壳界面的单斜和四方相氧化锆混合区域及靠近燃料芯块的四方相区域,在包壳界面附近约7μm范围内,观察到明显的705 cm^(-1)特征峰,该峰的形成源于界面压应力和辐照缺陷的共同作用;破损燃料棒形成了周向厚度为37~61μm的FCCI层,主要由两个不同形貌和相结构区域组成,即靠近包壳界面附近具有多孔、裂纹特征的单斜相氧化锆区域以及靠近燃料芯块的非晶结构区域。对FCCI层相结构的分布及转变影响因素进行了分析讨论,完整燃料棒FCCI层中四方相氧化锆的稳定与界面压应力、中子辐照缺陷和裂变产物作用有关,破损燃料棒FCCI层中单斜相氧化锆的存在则主要来源于应力的弛豫和氧的正常化学计量比。 展开更多
关键词 完整和破损燃料棒 fcci 氧化锆 拉曼光谱
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Segregation behavior and embrittling effect of lanthanide La, Ce, Pr,and Nd at Σ3(111) tilt symmetric grain boundary in α-Fe
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作者 Jinli Cao Wen Yang Xinfu He 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第12期298-302,共5页
The migration of lanthanide fission products to cladding materials is recognized as one of the key causes of fuel–cladding chemical interaction(FCCI) in metallic fuels during operation. We have performed first-princi... The migration of lanthanide fission products to cladding materials is recognized as one of the key causes of fuel–cladding chemical interaction(FCCI) in metallic fuels during operation. We have performed first-principles density functional theory calculations to investigate the segregation behavior of lanthanide fission products(La, Ce, Pr, and Nd) and their effects on the intergranular embrittlement at Σ3(111) tilt symmetric grain boundary(GB) in α-Fe. It is found that La and Ce atoms tend to reside at the first layer near the GB with segregation energies of-2.55 eV and-1.60 eV, respectively,while Pr and Nd atoms prefer to the core mirror plane of the GB with respective segregation energies of-1.41 eV and-1.50 eV. Our calculations also show that La, Ce, Pr, and Nd atoms all act as strong embrittlers with positive strengthening energies of 2.05 eV, 1.52 eV, 1.50 eV, and 1.64 eV, respectively, when located at their most stable sites. The embrittlement capability of four lanthanide elements can be determined by the atomic size and their magnetism characters. The present calculations are helpful for understanding the behavior of fission products La, Ce, Pr, and Nd in α-Fe. 展开更多
关键词 FIRST-PRINCIPLES fuel–cladding chemical interaction(fcci) fission products grain boundary segregation
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燃料包壳化学反应和相优化的U-Zr基金属燃料掺杂及性能改善研究
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作者 卓卫乾 《核动力工程》 EI CAS CSCD 北大核心 2023年第S01期158-162,共5页
针对U-Zr基金属燃料包壳化学反应(FCCI)和相优化问题,介绍了掺杂元素Sb、Mo、Nb和Ti对金属燃料的影响。结合扩散偶实验、高温加热实验,并利用扫描电子显微镜(SEM),X射线衍射(XRD)和热差仪分析(DSC)表征方法,对一系列U-Zr基金属燃料进行... 针对U-Zr基金属燃料包壳化学反应(FCCI)和相优化问题,介绍了掺杂元素Sb、Mo、Nb和Ti对金属燃料的影响。结合扩散偶实验、高温加热实验,并利用扫描电子显微镜(SEM),X射线衍射(XRD)和热差仪分析(DSC)表征方法,对一系列U-Zr基金属燃料进行了堆外评价。掺杂元素Sb用于抑制金属燃料在高燃耗下的FCCI。研究结果表明,Sb和镧系元素Ce结合生成沉淀,并且其沉淀产物不与包壳反应,证明了Sb可以作为一种潜在的掺杂元素解决高燃耗下的FCCI问题;掺杂元素Mo、Nb和Ti用于相优化,其中Mo、Nb降低了γ相的转变温度,且Mo的效果优于Nb。研究结果可为未来先进金属燃料的设计和优化提供数据支撑。 展开更多
关键词 U-Zr基金属燃料 元素掺杂 燃料包壳化学反应(fcci) 相优化 扫描电子显微镜(SEM) X射线衍射(XRD) 热差仪分析(DSC)
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