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nuclear Science and Techniques 2022年第10期33卷 53-67页

作者： Jing Chen Ze-Shi Liu Hao Jiang Xi-Ren Miao Yong Xu college of Electrical Engineering and Automation Fuzhou UniversityFuzhou 350108China The Department of Automation Shanghai Jiao Tong UniversityShanghai 200240China fujian fuqing nuclear power co. Ltd.Fujian 350318China

Anomaly detection for the control rod drive mechanism(CRDM) is key to enhancing the security of nuclear power plant equipment. In CRDM real-time condition-based maintenance, most existing methods cannot deal with long sequences and periodic abnormal events and have poor feature extraction from these data. In this paper,a learning-based anomaly detection method employing a long short-term memory-based autoencoder(LSTM-AE)network and an extreme gradient boosting(XGBoost)algorithm is proposed for the CRDM. The nonlinear and sequential features of the CRDM coil currents can be automatically and efficiently extracted by the LSTM neural units and AE network. The normal behavior LSTM-AE model was established to reconstruct the errors when feeding abnormal coil current signals. The XGBoost algorithm was leveraged to monitor the residuals and identify outliers for the coil currents. The results demonstrate that the proposed anomaly detection method can effectively detect different timing sequence anomalies and provide a more accurate forecasting performance for CRDM coil current signals.

关键词： Anomaly detection CRDM LSTM-AE Residuals XGBoost

Twin model-based fault detection and tolerance approach for in-core self-powered neutron detectors

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nuclear Science and Techniques 2023年第8期34卷 86-99页

作者： Jing Chen Yan-Zhen Lu Hao Jiang Wei-Qing Lin Yong Xu college of Electrical Engineering and Automation Fuzhou UniversityFuzhou 350108China The Department of Automation Shanghai Jiao Tong UniversityShanghai 200240China fujian fuqing nuclear power co. Ltd.Fujian 350318China

The in-core self-powered neutron detector(SPND)acts as a key measuring device for the monitoring of parameters and evaluation of the operating conditions of nuclear *** detection and tolerance of faulty SPNDs are indispensable for reliable reactor *** completely extract the correlated state information of SPNDs,we constructed a twin model based on a generalized regression neural network(GRNN)that represents the common relationships among overall *** SPNDs were determined because of the functional concordance of the twin model and real monitoring sys-tems,which calculated the error probability distribution between the model outputs and real *** detection follows a tolerance phase to reinforce the stability of the twin model in the case of massive failures.A weighted K-nearest neighbor model was employed to reasonably reconstruct the values of the faulty signals and guarantee data *** experimental evaluation of the proposed method showed promising results,with excellent output consistency and high detection accuracy for both single-and multiple-point faulty *** unexpected excessive failures,the proposed tolerance approach can efficiently repair fault behaviors and enhance the prediction performance of the twin model.

关键词： Self-powered neutron detector Twin model Fault detection Fault tolerance Generalized regression neural network nuclear power plant

Study on prediction model of cavitation erosion incubation period of duplex stainless steel surfacing layer in a benign medium

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Acta Mechanica Sinica 2022年第8期38卷 112-121页

作者： Yefeng Bao Chong Cao Bingqi Xie Qining Song Yongfeng Jiang Nan Xu college of Mechanical and Electrical Engineering Hohai UniversityChangzhou213022China fujian fuqing nuclear power co. LtdFuqing350300China

In order to estimate the cavitation incubation period of duplex stainless steel(DSS)under ultrasonic cavitation erosion(CE),this paper analyzed the loading process of material during ultrasonic *** strain theory,cumulative damage theory,and Bernoulli probability model were used to derive the minimum number of cavitation impacts required for the initiation of fatigue cracks,and the predictive equation of the material cavitation incubation period was *** was obtained by tungsten inert gas welding(TIG)powder surfacing *** test and ultrasonic CE test were performed,and the tensile test data were used to calculate the cavitation incubation period by using the predictive *** to the possible presence of precipitates and micro-cracks in the sample,there was an error between the calculated and the test *** results showed that the max error between the calculated results and the test results was 8.1%,and the errors of the remaining two groups were within 3.5%.

关键词： Duplex stainless steel Ultrasonic cavitation erosion Incubation period Calculation Tensile properties

Development of a portable and fast wire tension measurement system for MWPC construction

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Chinese Physics C 2016年第9期40卷 114-119页

作者：潘景辉马长利龚学余孙志嘉王艳风尹陈艳龚蕾 University of South China Hengyang 421001China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Dongguan Neutron Science Center Dongguan 523803China State Key Laboratory of Particle Detection and Electronics Beijing 100049China fujian fuqing nuclear power co. LtdChina National Nuclear CorporationFuqing 350318China

In a multi-wire proportional chamber detector（MWPC）, the anode and signal wires must maintain suitable tension, which is very important for the detector＇s stable and accurate performance. As a result, wire tension control and measurement is essential in MWPC construction. A high pressure3 He MWPC detector is to be used as the thermal neutron detector of the multi-functional reflectometer at China Spallation Neutron Source, and in the construction of the detector, we have developed a wire tension measurement system. This system is accurate,portable and time-saving. With it, the wire tension on an anode wire plane has been tested. The measurement results show that the wire tension control techniques used in detector manufacture are reliable.

关键词： MWPC wire tension tension measurement CSNS

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主蒸汽隔离阀油压开关泄漏分析

主蒸汽隔离阀油压开关泄漏分析

Analysis and Treatment of common Failure of the Turbine Driven Auxiliary Feedwater Pump in One nuclear power Station

中国核学会2021年学术年会

作者：胡文盛马旺发黄甦王礼明吴起郭超凡 fujian fuqing nuclear power co.ltd

主蒸汽隔离阀依靠液压油克服高压氮气阻力驱动开启并保持常开。某核电厂主蒸汽隔离阀调试期间出现油压开关泄漏的共模故障,造成液压油大量泄漏,阀门无法正常运行。从油压开关密封失效有关的因素如O型圈断口形貌、元素、液压油相容性、... 详细信息

主蒸汽隔离阀依靠液压油克服高压氮气阻力驱动开启并保持常开。某核电厂主蒸汽隔离阀调试期间出现油压开关泄漏的共模故障,造成液压油大量泄漏,阀门无法正常运行。从油压开关密封失效有关的因素如O型圈断口形貌、元素、液压油相容性、密封结构、动作过程等入手,得出发生失效的根本原因是油压开关密封设计缺陷。根据有关规范提出了油压开关密封结构优化设计方案。试验结果表明,油压开关改进效果良好,有力维护了关键设备的可靠性。

关键词：主蒸汽隔离阀油压开关泄漏分析

来源： cnki会议评论

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科技视界 2016年第20期 230-231,236页

作者： YANG Jie-hai XIAO Yi-ting fujian Ningde nuclear power co. Ltd.

1 Introduction Since the commissioning of the turbine driven auxiliary feedwater pump,within three years operation,a series of failures have occurred,such as failure of over-speed trip gear,low output,high vibration,trip gear reset failure,and so *** to the manufacturer’s advice and on-site maintenance experience,we carried out modification on

关键词： valve maintenance advice Turbine manufacturer nuclear steam Auxiliary turbine reset

Neodymium and samarium codoped PLZT ferroelectric ceramics for potential betavoltaic nuclear batteries

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Journal of Rare Earths 2023年第10期41卷 1583-1589,I0004页

作者： Zhixiong Song Jizhen Liu Liyan Xue Zhengming Jiang Fan Yang fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou350108China CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou350002China fujian Province Joint Innovation Key Laboratory of Fuel and Materials in Clean nuclear Energy System Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou350002China Xiamen Institute of Rare Earth Materials Haixi InstituteChinese Academy of SciencesXiamen361021China nuclear power Institute of China Chengdu610000China Sichuan Jcc Rare Earth Metals New Material co. Ltd.Chengdu610000China

In this work,neodymium(Nd)and samarium(Sm)codoped lead lanthanum zirconate titanate(PLZT)ceramics were prepared by a high-temperature solid-state *** samples were characterized by X-ray diffraction,scanning electron microscopy and ferroelectric *** earth-doped PLZT ceramics show good phase *** appropriate rare earth element doping amount increases the densities of PLZT ceramics and reduces their resistivities,which is due to the role of rare earth elements in grain ***,the increase in the amount of grain boundaries caused by grain refinement also affects domain ***,with increasing doping concentration,the remnant polarization of PLZT gradually decreases,and the doping of rare earth elements also slightly reduces the band gap of *** irradiation with an X-ray simulated beta source with a particle energy of 10 keV(between the average energies of the beta particles of^3H and^(63)Ni),the ceramic sheets in this work produce current densities of up to 1.38 nA/cm^*** indicates that Nd and Sm codoped PLZT ceramics have a certain potential for application in betavoltaic batteries.

关键词： Betavoltaic battery Rare earths Ferroelectric X-ray

Synthesis of Agomelatine by One-pot Catalytic Hydrogenation and Acetylation with NiO

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Journal of Wuhan University of Technology(Materials Science) 2019年第2期34卷 453-458页

作者：于志君 CHENG Zhengzai 谢聪 ZENG Sheng DENG Haiying LIU Panpan HU Hai LI Guangyao DING Ling Mario Gauthier LI Shiqian School of Medicine Wuhan University of Science and Technology Non-power nuclear Technology Research and Development Center Hubei University of Science and Technology The State Key Laboratory of Refractories and Metallurgy (Wuhan University of Science and Technology) coal conversion and New Carbon Materials Hubei Key Laboratory School of Chemistry and Chemical Engineering Wuhan University of Science and Technology Key Laboratory of Measurement and control System for Offshore Environment Fuqing Branch of Fujian Normal University

Nano-NiO and bulk NiO were prepared from Ni(AC)_2·4 H_2O by coordination precipitation using aqueous ammonia and by a solid state reaction, respectively. The nickel oxide particles were characterized by X-ray Diffraction(XRD) and scanning electron microscopy(SEM). The results indicate that nano-sized NiO has a crystal phase with a standard face-centered cubic lattice structure, with a mean particle diameter of about 10 nm. The evaluation of the activity of nickel oxide nanoparticles in the catalytic hydrogenation of 7-methoxy-1-naphthylacetonitrile was carried out. The results demonstrate the efficient synthesis of the title compound by a one-pot catalytic hydrogenation and acetylation with NiO. The NiO nanoparticles displayed superior catalytic activity in the synthesis of agomelatine in the one-pot *** total yield of agomelatine is over 81.8% with a purity of 99.2%, as determined by HPLC. The structure of agomelatine was confirmed by IR, MS, and 1 H NMR analysis.

关键词： nano-NiO homogeneous precipitation method catalytic hydrogenation agomelatine N-[2-(7-Methoxy-1-naphthyl)ethyl]acetamide 7-Methoxy-1-naphthylacetonitrile

Tuning method for governor control parameters of hydropower generator in isolated grid considering primary frequency performance and small-signal stability

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Global Energy Interconnection 2018年第5期1卷 568-575页

作者： Zhenhua Xu State Grid fujian Electric power Research Institute

This paper presents a method of tuning governor control parameters of an isolated hydropower generator considering the primary frequency performance and small-signal stability. First, generators that can be operated in isolated state are identified. Second, different schemes are proposed for generator mode switching from on-grid to off-grid state through comparison and mechanism analysis. Third, the time domain model and frequency domain model of the isolated generator governor are constructed to respectively estimate the primary frequency performance and small signal stability. Parameter sets that satisfy the primary frequency performance and small signal stability are acquired as optimal values of governor control parameters. Finally, the measurement-based parameters of the governor are identified and validated using simulations to demonstrate the feasibility and effectiveness of the method.

关键词： Isolated grid Primary frequency regulation capability Small-signal stability Laplace transfer Parameter adjusting

先进压水堆技术——“华龙一号”及福清5号机组

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Engineering 2023年第12期31卷 31-36页

作者： Ji Xing Chunning Jing Yemin Dong Li Fan China nuclear power Engineering co.ltd. Beijing 100840China

*** HPR1000 is an advanced mega-kilowatt-class third-generation pressurized water reactor(PWR)nuclear power technology developed by China,based on more than 30 years of experience in the scientific research,design,equ... 详细信息

关键词： operation construction power