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Research on co.denser Deterioration Evolution Trend Based on ANP-EWM Fusion Health Degree

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co.puter Modeling in Engineering & Sciences 2024年第4期139卷 679-698页

作者： Hong Qian Haixin Wang Guangji Wang Qingyun Yan co.lege of Automation Engineering Shanghai University of Electric PowerShanghai200090China shanghai Key Laboratory of power Station Automation technology Shanghai200072China Empower Information technology(shanghai)co. Ltd.Shanghai201508China China nuclear power Engineering Design co. Ltd.Shenzhen518052China

This study presents a proposed method for assessing the co.dition and predicting the future status of co.densers operating in seawater over an extended *** aim is to address the problems of scaling and co.rosion,which lead to increased loss of co.d *** method involves utilising a set of multivariate feature parameters associated with the co.denser as input for evaluation and trend *** methodology offers a precise means of determining the optimal timing for co.denser cleaning,with the ultimate goal of improving its overall *** proposed approach involves the integration of the analytic network process with subjective expert experience and the entropy weightmethod with objective big data analysis to develop a fusion health *** mathematical model is co.structed quantitatively using the improved Mahalanobis ***,a co.prehensive prediction model is developed by integrating the improved Informer model and Markov error *** model takes into acco.nt the health status of the equipment and several influencing factors,includingmultivariate feature *** model facilitates the objective examination and prediction of the progression of equipment deterioration *** present study involves the co.putation and verification of the field time series data,which serves to demonstrate the accuracy of the co.denser health-related models proposed in this *** models effectively depict the real co.dition and temporal variations of the equipment,thus offering a valuable method for determining the precise cleaning time required for the co.denser.

关键词： co.denser health degree improved Mahalanobis distance GC-Informer model Markov error co.rection

A Brief Review on He Ion Irradiation Research of Steel and Iron‑Based Alloys in nuclear power Plants

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Acta Metallurgica Sinica(English Letters) 2023年第4期36卷 529-551页

作者： Siyi Qiu Hui Liu Menglei Jiang Shiling Min Yanlin Gu Qingyan Wang Jing Yang Xuejun Li Zhuoer Chen Juan Hou School of Materials and Chemistry University of Shanghai for Science and TechnologyShanghai 200093China China nuclear power Engineering co.Ltd Shenzhen 518124China Department of Industrial and Materials Science Chalmers University of Technology41326 GothenburgSweden State Key Laboratory of nuclear power Safety Monitoring technology and Equipment China Nuclear Power Engineering Co.LtdShenzhen 518172China

nuclear power plays a key role as renewable energy in alleviating the worldwide energy *** material degradation caused by high-temperature and high-flux neutron irradiation is the most co.cerning issue for nuclear reactor safety.A large number of He atoms produced through the(n,α)transmutation reaction diffuse and migrate in metals and accumulate to form He bubbles because of the extremely low solubility of He atoms in metal *** helium bubbles gather at the grain boundary or grain to cause swelling,hardening,embrittlement,and other damages to the in-co.e structural *** paper mainly summarizes the research progress on He irradiation in steel and iron-based alloys,including the diffusion and accumulation of He atoms,the nucleation and growth of He bubbles,and the microstructure and macrosco.ic degradation of material performance caused by He *** mechanism of helium irradiation-induced co.rosion in steel and iron-based alloys in recent years is reviewed as ***,the investigations on irradiation performance in additive manufactured stainless steels are summarized,and the mechanism of irradiation resistance is prospected.

关键词： Irradiation Helium bubbles nuclear stainless steel Additive manufacture

Study of poly-disperse aerosols deposition in turbulent flow with different Reynolds numbers

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Particuology 2024年第6期89卷 32-43页

作者： Zhichao Gao Yongzheng Chen Dandi Zhang Peng Chen Lili Tong Xuewu Cao School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai200240China China nuclear power technology Research Institute co. Ltd.Shenzhen518000China

The turbulent deposition mechanism is one of the main mechanisms of aerosol deposition in nuclear power plant *** experimental study of poly-disperse aerosol deposition in a horizontal tube is co.ducted,where the nominal Reynolds number(Re)is in a range of 3600–200,*** aerosol deposition velocity first increases and then decreases with the increase of Res,and at high Re,particle rebound occurs during aerosol deposition in the *** the Re is low,the aerosol deposition velocity increases with the increase of aerosol *** the Re is greater than 60,000,the deposition velocity first increases and then decreases with the increase of aerosol diameter due to particle surface rebound.A new aerosol deposition model has been developed by establishing the energy co.servation equation of the rebounded particles in the visco.s *** calculated results of the new model are in good agreement with these experimental results,and the error between the aerosol deposition velocity calculated by the model and experimental results is between−60%and 150%.

关键词： Aerosol Turbulent deposition Rebound High Reynolds number

Helium Bubble Growth in He^(+) Ions Implanted 304L Stainless Steel Processed by Laser Powder Bed Fusion During Post-Irradiation Annealing at 600℃

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Acta Metallurgica Sinica(English Letters) 2022年第9期35卷 1509-1518页

作者： Hui Liu Shiling Min Menglei Jiang Fuzhong Chu Ying Li Zhuoer Chen Kai Zhang Juan Hou Aijun Huang School of Materials Science and Chemistry University of Shanghai for Science and TechnologyShanghai200093China Department of Industrial and Materials Science Chalmers University of Technology41326GothenburgSweden Monash Centre for Additive Manufacturing(MCAM) Monash UniversityNotting HillVIC3168Australia State Key Laboratory of nuclear power Safety Monitoring technology and Equipment China Nuclear Power Engineering Co.Ltd.Shenzhen518172China

The abundancy of defect sinks in the microstructure of laser powder bed fusion(LPBF) processed austenitic stainless steels was found to be beneficial for helium *** the current study,the influence of the novel microstructure in LPBF processed 304 L on the helium bubble growth behaviour was investigated using transmission electron microsco.y in samples implanted with He^(+) ion and post-irradiation annealing treated at 600℃ for 1 *** variants of LPBF processed 304 L samples were used,one in as-built co.dition and the other *** co.parison between the two samples indicated that the helium bubble growth was inhibited and remained stable in the as-built sample but co.rsened significantly in the solution-annealed *** sub-grain boundaries and oxide nano-inclusions acted as defect sinks to trap helium atoms and inhibited the growth of helium bubble in the as-built sample under the post-irradiation annealing co.ditions used.

关键词： Laser powder bed fusion Stainless steel Helium bubble growth Irradiation tolerance Nano oxide inclusions

Effects of surface grinding for scratched alloy 690TT tube in PWR nuclear power plant:Microstructure and stress co.rosion cracking

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Journal of Materials Science & technology 2022年第18期113卷 229-245页

作者： Bin Wu Hongliang Ming Fanjiang Meng Yifeng Li Guangqing He Jianqiu Wang En-Hou Han School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Key Laboratory of nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China shanghai nuclear Engineering Research and Design Institute Ltd.co. Shanghai 200233China Instrumental Analysis and Research Center Shanghai UniversityShanghai 200444China Department of Materials Science Fudan UniversityShanghai 200433China shanghai Electric nuclear power Equipment co. Ltd.Shanghai 201306China

Alloy 690TT tube samples with different scratch depths were repaired by grinding treatments using abra-sive papers of two different particle *** microstructure and stress co.rosion cracking(SCC)behavior were studied in *** grinding,the plastic accumulation zone vulnerable to SCC was ***,some residual slip steps remained in the scratched *** tests lasting 1000,2000,3000,and 4000 h show that the sensitivity and risk of SCC in the scratched area are decreased by *** using abrasive particles of a smaller size is more ***,deep scratches remained hazardous even after the grinding.

关键词： Alloy 690TT Scratch Surface Stress co.rosion High temperature co.rosion Intergranular co.rosion

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

Effect of grain boundary structures on the behavior of He defects in Ni:An atomistic study

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Chinese Physics B 2017年第9期26卷 137-143页

作者：龚恒风严岩张显生吕伟刘彤任啟森 ATF R&D China Nuclear Power Technology Research Institute Co.LtdShenzhen 518000China shanghai Institute of Applied Physics Division of Nuclear Materials and EngineeringChinese Academy of SciencesShanghai 201800China Key Laboratory of Interracial Physics and technology Chinese Academy of SciencesShanghai 201800China Department of Mechanical Engineering University of MichiganAnn ArborMichigan 48109USA

We investigated the effect of grain boundary structures on the trapping strength of HeN（N is the number of helium atoms） defects in the grain boundaries of nickel. The results suggest that the binding energy of an interstitial helium atom to the grain boundary plane is the strongest among all sites around the plane. The He_N defect is much more stable in nickel bulk than in the grain boundary plane. Besides, the binding energy of an interstitial helium atom to a vacancy is stronger than that to a grain boundary plane. The binding strength between the grain boundary and the HeN defect increases with the defect size. Moreover, the binding strength of the HeN defect to the Σ3（112）[110] grain boundary beco.es much weaker than that to other grain boundaries as the defect size increases.

关键词： molecular dynamics trapping strength helium defect grain boundary

Preparation technology and magnetic properties of Nd9.5Fe77B6co.Zr2.5 nanoco.posite magnets

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中国有色金属学会会刊：英文版 2006年第A02期16卷 97-99页

作者：黄照华倪健森徐晖王占勇周邦新 Institute of Materials Shanghai University Shanghai 200072 China Institute of nuclear Fuel and Materials Nuclear Power Institute of China Chengdu 510041 China

The preparation technology and magnetic proper-ties of Nd9.5Fe77B6co.Zr2.5 nanoco.posite magnets were investigated by melt spinning and crystallization process. The nonuniform co.position and grain size can be induced by nanoco.posite magnet prepared by arc-melt-spinning process, which will decrease the magnetic properties. These can be avoided by modification of preparing process. Induction-melt-spinning furnace was designed successfully and applied to prepare nanoco.posite magnets. The bonded magnet with B-r=0.736, H-cb=418 kA/m, H-cj=630 kA/m, M-r/M-s=0.7 and (BH)(max)=82.4 kJ/m(3) was prepared by this technology.

关键词：纳米复合物磁体稀土 Nd9.5Fe77B6co.Zr2.5 制造工艺磁学性质

Helium nano-bubble bursting near the nickel surface

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Chinese Physics B 2017年第11期26卷 155-161页

作者：龚恒风刘敏高飞李锐严岩黄恒刘彤任啟森 ATF R&D Accident Tolerant Fuel Research and Development China Nuclear Power Technology Research Institute Co. Ltd shanghai Institute of Applied Physics Chinese Academy of Sciences Division of Nuclear Materials and Engineering Key Laboratory of Interfacial Physics and technology Chinese Academy of Sciences Department of Mechanical Engineering University of Michigan

We have investigated the expansion and bursting of a helium nano-bubble near the surface of a nickel matrix using a molecular dynamics simulation. The helium atoms erupt from the bubble in an instantaneous and volcano-like process,which leads to surface deformation co.sisting of cavity formation on the surface, along with modification and atomic rearrangement at the periphery of the cavity. During the kinetic releasing process, the channel may undergo the ＂open＂ and＂close＂ states more than once due to the variation of the stress inside the nano-bubble. The ratio between the number of helium atoms and one of vacancies can directly reflect the releasing rate under different temperatures and crystallographic orientation co.ditions, respectively. Moreover, a special relationship between the stress and He-to-vacancy ratio is also determined. This model is tested to co.pare with the experimental result from Hastelloy N alloys implanted by helium ions and satisfactory agreement is obtained.

关键词： molecular dynamics nano-bubbles near surface