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Effects of interstitial cluster mobility on dislocation loops evolution under irradiation of austenitic steel

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nuclear Science and Techniques 2024年第8期35卷 69-78页

作者： Xin‑Hua Yan Lu Sun Du Zhou Teng Xie Chang Peng Ye‑Xin Yang Li Chen Zhen‑Feng Tong North China Electric power University Beijing 102206China China nuclear power operations co. LtdShenzhen 518000China

The evolution of dislocation loops in austenitic steels irradiated with Fe^(+)is investigated using cluster dynamics(CD)simulations by developing a CD *** CD predictions are co.pared with experimental results in the *** number density and average diameter of the dislocation loops obtained from the CD simulations are in good agreement with the experimental data obtained from transmission electron microsco.y(TEM)observations of Fe~+-irradiated Solution Annealed 304,co.d Worked 316,and HR3 austenitic steels in the *** CD simulation results demonstrate that the diffusion of in-cascade interstitial clusters plays a major role in the dislocation loop density and dislocation loop growth;in particular,for the HR3 austenitic steel,the CD model has verified the effect of temperature on the density and size of the dislocation loops.

关键词： Cluster dynamics Dislocation loops In-cascade interstitial clusters Austenitic steels

Apparatus for determining permeability of hydrogen isotopes in molten-salt

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nuclear Science and Techniques 2014年第4期25卷 73-78页

作者：曾友石吴胜伟钱渊王广华杜林刘卫夏正海 University of Chinese Academy of Sciences Key Laboratory of nuclear Radiation and nuclear Energy Technology Shanghai Institute of Applied PhysicsChinese Academy of Sciences CNNC nuclear power operations management co.Ltd.

In order to provide data on diffusion co.fficients and solubility co.stants of tritium in molten salts for the critical issue of tritium co.trol in the Thorium Molten Salt Reactor(TMSR)program,a two-chamber permeability apparatus separated by a nickel plate had been developed for determining the permeability of hydrogen isotope in molten *** on the permeability apparatus,experimental procedure and the analytical method for determining the diffusivity and solubility of hydrogen isotope in molten salts were presented in this *** assess the performance of the apparatus,the blank tests without molten salt were co.ducted at300-700℃.The results showed that the nickel plate acting as the window for hydrogen isotope permeation in the apparatus seemed to have less effect on experiments of determining the permeability of hydrogen isotope in molten slat at 500-700℃.Furthermore,the applicability of the apparatus with molten salt was also evaluated experimentally,with test experiments of molten Flinak(LiF-NaF-KF)at 500℃,600℃and 700℃.Diffusion co.fficients and solubility co.stants of hydrogen in molten Flinak can be derived from those test experiments,which were co.related to D_(Flinak-H)=7.06×10^(-5)e^(-54.9/(R_gT))m^2/s and s_(Flinak-H)=1.67×10^(-7)e^(27.0/(r_gt))mol-H_2/(m^3 Pa).

关键词：氢同位素熔融盐渗透性装置实验程序空白试验溶解度熔盐堆

Analysis of the influence on environmental radiation level of Qinshan area caused by Fukushima nuclear accident

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nuclear Science and Techniques 2014年第A01期25卷 66-70页

作者：高阳朱月龙 CNNC nuclear power operations management co. Ltd. Zhejiang 314300 China

In order to monitor the diffusion and deposition of radioactive plume in Qinshan area after Fukushima nuclear accident, a co.tinuous air sampling was did from March 25 to May 6. A trace of Cs-134 and I-131 were detected in the period. Results of co.ventional environmental radiation monitoring also showed that the specific activity of Sr-90 and Cs-137 in environmental samples had some abnormal changes in 2011 which almost felt back to normal level in 2012. Although there is no abnormal change on environmental radiation level of Qinshan area till now, the influence caused by Fukushima nuclear accident should be paid co.tinuously attention in future by radiation monitoring.

关键词：环境辐射水平核事故山地监测结果放射性烟云铯-137 环境样品辐射监测

Occurrence of HTO and NE-OBT in soil in the vicinity of the Qinshan nuclear power Plant

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nuclear Science and Techniques 2016年第4期27卷 1-6页

作者： lin du qin zhang zheng-hai xia yu-hua ma ling wang lai-lai qin ke deng sheng-wei wu guang-hua wang wei liu Shanghai Institute of Applied Physics Chinese Academy of Science Shanghai 201800 China University of Chinese Academy of Science Beijing 100049China CNNC nuclear power operations management co. Ltd Haiyan 314300 China Shanghai Tech University Shanghai 201210 China

In this study, co.centrations of tritiated water(HTO) and non-exchangeable organically bound tritium(NE-OBT) and the NE-OBT/HTO ratios were determined in soil around Qinshan nuclear power Plant(NPP), Zhejiang, China, and their vertical profile and spatial distribution were investigated. Results showed variations in both the HTO and NE-OBT co.centrations in the vertical profile. The HTO co.centrations generally decreased firstly and then increased with the increasing depths, but the trend was not significant. The NE-OBT co.centrations in the surface soils(0–5 cm) were co.siderably lower than those in the deep soils(5–25 cm) at all the sites. The NE-OBT/HTO ratios also show a variable vertical profile, initially increasing and then decreasing with increasing soil *** the HTO and NE-OBT co.centrations decreased with the increasing distance to the HWRs in deep soil layers(5–25 cm), revealing that the released tritium from the NPP affected the spatial distribution.

关键词：土壤水秦山核电站空间分布土层深度秦山核电厂 HTO 水浓度氚浓度

co.pliance-based testing method for fatigue crack propagation rates of mixed-modeⅠ-Ⅱcracks

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Science China(Technological Sciences) 2021年第12期64卷 2577-2585页

作者： QI Shuang XIANG WenXin CAI LiXun LIU XiaoKun SHAO ChunBing NING FangMao SHI JinHua YU WeiWei Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Taishan nuclear power Joint Venture co. Ltd.Jiangmen 529200China power Plant Life management Research Center Suzhou Nuclear Power Research InstituteSuzhou 215004China

Mixed-mode I-II crack-based fatigue crack propagation(FCPⅠ-Ⅱ)usually occurs in engineering structures;however,no theoretical formula or effective co.pliance test methods have been established for FCPI-IIto *** mixed-mode I-II flawed co.ponents,based on the principle of mean-value energy equivalence,we propose a theoretical method to describe the relationship between material elastic parameters,geometrical dimensions,load(or displacement),and *** on the maximum circumferential stress criterion,we propose a uniform co.pliance model for co.pact tensile shear(CTS)specimens with horizontal cracks deflecting and propagating(flat-folding propagation)under different loading angles,geometries,and *** with an innovative design of the fixture of CTS specimens used for FCPI-IItests,we develop a new co.pliancebased testing method for FCPⅠ-Ⅱ.For the 30Cr2Ni4MoV rotor steel,the FCP rates of modeⅠ,modeⅡ,and mixed-modeⅠ-Ⅱcracks were obtained via FCP tests using co.pact tension,Arcan,and CTS specimens,*** obtained da/d N versusΔJ curves of the FCP rates are *** loading angleαand dimensionless initial crack length a0/W demonstrated negligible effects on the FCP ***,the FCP rates of mode I crack can be used to predict the residual life of structural crack propagation.

关键词： finite element analysis mixed-modeⅠ-Ⅱcrack fatigue crack propagation rate energy equivalence principle testing method

The Result Integration Algorithm Based on Matching Strategy

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Wuhan University Journal of Natural Sciences 2006年第1期11卷 113-116页

作者： XU Jia-shu YE Zhi-qiang QIN Zheng Department of co.puter Science and Technology Xi＇an Jiaotong University Xi＇an 710049 Shaanxi China School of management Huazhong University of Science and Technology Wuhan 430074 Hubei China Daya Bay nuclear power operations and management co. Ltd Shenzhen 518124 Guangdong China

The following paper provides a new algorithm： a result integration algorithm based on matching strategy. The algorithm extracts the title and the abstract of Web pages, calculates the relevance between the query string and the Web pages, decides the Web pages accepted, rejected and sorts them out in user interfaces. The experiment results in dieate obviously that the new algorithms improve the precision of meta-search engine. This technique is very useful to metasearch engine.

关键词： meta-search engine relevance Web page

System Monitoring Program Development Process in the nuclear power Plant

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Journal of Donghua University(English Edition) 2018年第4期35卷 348-352页

作者： ZHU Guixia BAO Xudong KANG Chengjie LIU Wei QIN Feng LU Bing Research Institute of nuclear power Operation Wuhan 430223 China CNNP nuclear power operations management co.poration Ltd. Jiaxing 314300 China

Performance monitoring is the important part of the equipment reliability process description( AP913),and the system performance is the main co.tent of monitoring. The purpose of system performance monitoring is to identify early performance degradation of system and equipment in time,evaluate the overall health of system, and carry out co.rective actions in a timely manner. Performance monitoring also has the co.responding experience feedback. The paper introduces the process of system monitoring program development. In the end,the paper takes an example of the turbine co.trol fluid system( GFR) in a domestic nuclear power plant. The example shows the process is good for the analysis.

关键词： system performance monitoring plan system functionanalysis system performance monitoring Turbine co.trol fluid system

MULTI-SENSOR IMAGE REGISTRATION BASED ON GEOMETRIC AFFINE INVARIANT

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MULTI-SENSOR IMAGE REGISTRATION BASED ON GEOMETRIC AFFINE IN...

Effect of Mn co.tent on microstructure and properties of AlCrCuFeMnx high-entropy alloy

第25届中国控制与决策会议

作者： Bin Li Huijuan Guo Boang Liu Hao Ye Tsinghua University China nuclear power Engineering co. Ltd.

ISBN: (纸本)9781467355339

A new automatic feature-based registration algorithm of multi-sensor images with affine deformation is presented. The gray scale discrepancy between co.responding pixels and co.plex geometric deformation are two challenges in the problem of multi-sensor image registration, which make the design of robust feature descriptor very difficult. In the proposed method, the intersections of extracted line segments from both images are used as the feature points, due to their good robustness against gray scale discrepancy. In co.trast to most existing feature-based methods that describe feature points directly, we first co.struct a new feature, named feature segment, based on the feature points, and then describe each feature segment with a descriptor. The additional procedure of feature segment co.struction enables us to introduce an algebraic affine invariant into the design of feature descriptor. By doing these, the proposed algorithm’s robustness to both affine deformation and gray scale discrepancy can be guaranteed. In addition, since the calculation of feature descriptors only involves simple algebraic operations, the proposed method has low co.putational load. Experimental results using real multi-sensor image pairs are presented to show the merits of the proposed method.

关键词： image registration affine invariant segment multi-sensor

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China Foundry 2024年第2期21卷 147-158页

作者： Ning Wang Kai Ma Qiu-da Li Yu-dong Yuan Yan-chun Zhao Li Feng School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Reuse of Nonferrous Metals Lanzhou 730050China CNNC nuclear power Operation and management co. Ltd.Haiyan 314300ZhejiangChina

AlCrCuFeMnx(x=0,0.5,1,1.5,and 2)high-entropy alloys were prepared using the vacuum arc melting *** microstructure and mechanical properties of AlCrCuFeMnxwere analyzed and tested by XRD,SEM,TEM,nanoindentation,and electronic universal *** results indicate that the AlCrCuFeMnxhigh-entropy alloy exhibits a dendritic structure,co.sisting of dendrites with a BCC structure,interdendrite regions with an FCC structure,and precipitates with an ordered BCC structure that form within the ***(Mn)has a strong affinity for dendritic,interdendritic,and precipitate structures,allowing it to easily enter these *** an increase in Mn co.tent,the size of the precipitated nanoparticles in the dendritic region initially increases and then ***,the area fraction initially decreases and then ***,the alloy’s strength and wear resistance decrease,while its plasticity *** Al Cr Cu Fe Mn1.5alloy boasts excellent mechanical properties,including a hardness of 360 HV and a wear rate of 2.4×10^(-5)mm^(3)·N^(-1)·mm^(-1).It also exhibits impressive yield strength,co.pressive strength,and deformation rates of 960 MPa,1,700 MPa,and 27.5%,respectively.

关键词： high-entropy alloys microstructure mechanical properties wear resistance strengthening mechanisms