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Seismic and stress qualification of LMFR fuel rod and simple method for the determination of LBE added mass effect 被引量:1
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作者 M.Khizer Jian-Wei Chen +3 位作者 Guo-Wei Yang Qing-Sheng Wu Yong Song Yong Zhang 《Nuclear Science and Techniques》 SCIE CAS CSCD 2020年第1期42-56,共15页
In this study, two different designs of liquid metal fast reactor(LMFR) fuel rods wire-wrapped and nonwire-wrapped(bare) are compared with respect to different parameters as a means of considering the optimum fuel des... In this study, two different designs of liquid metal fast reactor(LMFR) fuel rods wire-wrapped and nonwire-wrapped(bare) are compared with respect to different parameters as a means of considering the optimum fuel design. Nuclear seismic rules require that systems and components that are important for safety must be capable of bearing earthquake effects, and that their integrity and functionality should be guaranteed. Mode shapes, natural frequencies, stresses on cladding, and seismic aspects are considered for comparison using ANSYS. Modal analysis is compared in a vacuum and in lead–bismuth eutectic(LBE) using potential flow theory by considering the added mass effect. A simple and accurate approach is suggested for the determination of the LBE added mass effect and is verified by a manually calculated added mass, which further proved the usefulness of potential flow theory for the accurate estimation of the added mass effect. The verification of the hydrodynamic function(τ) over the entire frequency range further validated the finite element method(FEM) modal analysis results. Stresses obtained for fuel rods against different loading combinations revealed that they were within the allowable limits with maximum stress ratios of 0.25(bare) and 0.74(wire-wrapped). In order to verify the structural integrity of cladding tubes, stresses along the cladding length were determined during different transients and were also calculated manually for static pressure. The manual calculations could be roughly compared with the ANSYS results, and the two showed a close agreement. Contact analysis methodology was selected,and the most appropriate analysis options were suggested for establishing contact between the wire and cladding for the wire-wrapped design grid independence analysis,which proved the accuracy of the results, confirmed the selection of the appropriate procedure, and validated the use of the ANSYS mechanical APDL code for LMFR fuel rod analysis. The results provided detailed insight into the structural design of LMFR fuel rods by considering different structural configurations(i.e., bare and wire-wrapped) in the seismic loading;this not only provides a FEM procedure for LMFR fuel with complex configuration, but also guides the reference design of LMFR fuel rods. 展开更多
关键词 lmfr Fuel rod Added mass Seismic analysis Contact analysis
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Monte Carlo Simulation of BN-600 LMFR Hybrid Core
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作者 Mohga I. HassaN Moustafa Aziz 《材料科学与工程(中英文B版)》 2011年第6期838-842,共5页
关键词 蒙特卡罗模拟 混合动力 三维模型 计算理论 功率分布 中子通量 操作条件 控制棒
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快堆绕丝组件三维精细化多孔介质模型与验证 被引量:1
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作者 陈宇彤 张大林 +4 位作者 梁禹 周磊 田文喜 秋穗正 苏光辉 《核动力工程》 EI CAS CSCD 北大核心 2021年第S01期53-57,共5页
液态金属冷却快堆(LMFR,简称“快堆”)通常采用带绕丝棒束的闭式燃料组件,为了准确地计算组件盒内径向温度分布,同时节约计算资源,提出了基于计算流体动力学(CFD)方法的三维精细化多孔介质模型,将绕丝作为多孔介质固体骨骼均匀化计入棒... 液态金属冷却快堆(LMFR,简称“快堆”)通常采用带绕丝棒束的闭式燃料组件,为了准确地计算组件盒内径向温度分布,同时节约计算资源,提出了基于计算流体动力学(CFD)方法的三维精细化多孔介质模型,将绕丝作为多孔介质固体骨骼均匀化计入棒束流动通道中,在多孔介质动量方程中加入分布式阻力源项考虑绕丝的流动阻力,修正能量方程扩散项以考虑绕丝扫流和热羽流造成的横向交混。采用美国橡树岭国家实验室(ORNL)快堆19棒带绕丝组件钠实验进行验证计算,数值计算结果与实验结果对比发现,建立的三维精细化多孔介质模型得出的快堆组件径向温度分布与实验结果符合良好。因此,本研究提出的三维精细化多孔介质模型可用于快堆绕丝组件内径向温度分布的精确预测。 展开更多
关键词 液态金属冷却快堆(lmfr) 带绕丝棒束 径向温度分布 多孔介质模型 计算流体动力学(CFD)
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Nb对钠冷快堆包壳用15-15Ti奥氏体不锈钢组织和拉伸性能的影响 被引量:3
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作者 乔羽飞 陈思含 +4 位作者 任媛媛 梁田 刘春明 马颖澈 刘奎 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2021年第11期4079-4088,共10页
使用OM、SEM和TEM等方法研究了质量分数0%,0.21%,0.46%Nb对固溶态和时效态15Cr-15Ni含Ti奥氏体不锈钢(15-15Ti)中析出相类型、形貌及其分布的影响。结果表明,Nb取代了(Ti,Mo)C相中部分Ti、Mo原子,在0.21%Nb和0.46%Nb合金中形成富Nb的(Nb... 使用OM、SEM和TEM等方法研究了质量分数0%,0.21%,0.46%Nb对固溶态和时效态15Cr-15Ni含Ti奥氏体不锈钢(15-15Ti)中析出相类型、形貌及其分布的影响。结果表明,Nb取代了(Ti,Mo)C相中部分Ti、Mo原子,在0.21%Nb和0.46%Nb合金中形成富Nb的(Nb,Ti)C相,而且Nb含量的增加使固溶态的奥氏体基体组织细化。在850℃时效1000 h后,组织中有Sigma相、MC碳化物析出,Nb的增加促进了Nb、Mo元素在Sigma相中的富集,促使Sigma相更为细小、弥散析出。固溶态和时效态试样的室温、650℃拉伸结果表明,在0%,0.21%,0.46%Nb范围内,Nb含量的增加对固溶态合金室温和高温拉伸性能影响较小,而Nb促进析出的Sigma相对时效态合金的拉伸性能影响较小。 展开更多
关键词 钠冷快堆 包壳材料 奥氏体不锈钢 Sigma相 拉伸性能
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