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In-situ TEM observation of the evolution of helium bubbles in Mo during He^(+)irradiation and post-irradiation annealing

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Chinese Physics B 2021年第8期30卷 102-112页

作者： Yi-Peng Li Guang Ran Xin-Yi Liu Xi Qiu Qing Han Wen-Jie Li Yi-Jia Guo College of Energy Xiamen UniversityXiamen 361102China Fujian Research Center for Nuclear Engineering Xiamen 361102China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610213China

The evolution of helium bubbles in purity Mo was investigated by in-situ transmission electron microscopy(TEM)during 30 keV He^(+)irradiation(at 673 K and 1173 K)and post-irradiation annealing(after 30 keV He^(+)irradiation with the fluence of 5.74×10^(16)He^(+)/cm^(2)at 673 K).Both He^(+)irradiation and subsequently annealing induced the initiation,aggregation,and growth of helium *** had a significant effect on the initiation and evolution of helium *** higher the irradiation temperature was,the larger the bubble size at the same irradiation fluence would *** 1173 K irradiation,helium bubbles nucleated and grew preferentially at grain boundaries and showed super large size,which would induce the formation of *** the same time,the geometry of helium bubbles changed from sphericity to *** polyhedral bubbles preferred to grow in the shape bounded by{100}*** statistical analysis of the characteristic parameters of helium bubbles,the functions between the average size,number density of helium bubbles,swelling rate and irradiation damage were ***,an empirical formula for calculating the size of helium bubbles during the annealing was also provided.

关键词： helium bubbles in-situ TEM observation ion irradiation annealing molybdenum

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Particle swarm optimised fuzzy PID control method for hybrid magnetic bearings 3

Particle swarm optimised fuzzy PID control method for hybrid...

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3rd International Conference on Intelligent Mechanical and Human-Computer Interaction technology, IHCIT 2024

作者： Xiong, Feng Han, Jinchang Xu, Wenhao Li, Yan Institute of Noise & vibration Naval University of Engineering Wuhan430033 China National Key Laboratory on Ship Vibration & Noise Wuhan China Science and Technology on System Design Technology Laboratory Nuclear Power institute of China Chengdu610213 China

ISBN: (纸本)9781510683105

To enhance the control effectiveness of hybrid magnetic bearings (HMBs), this paper proposes a PSO-based fuzzy PID control algorithm. The algorithm optimizes the fuzzy controller's output parameters using the Particle Swarm Optimization technique, effectively addressing the limitations caused by fixed parameters and improving control accuracy. The effectiveness of the PSO algorithm optimization is verified through simulations of a hybrid magnetic bearing system built in Simulink. Compared to the fuzzy PID control algorithm, this method demonstrates a faster response and smaller overshoot, achieving better results in controlling the vibration displacement of rotors supported by hybrid magnetic bearings. © 2024 SPIE.

关键词： Particle swarm optimization (PSO)

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DEVELOPMENT OF QUENCH ANALYSIS PROGRAM BASED ON ARSAC 29

DEVELOPMENT OF QUENCH ANALYSIS PROGRAM BASED ON ARSAC

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2022 29th International Conference on Nuclear Engineering, ICONE 2022

作者： Zhong, Lei Yu, Hongxing Chen, Deqi Liu, Hanzhou Deng, Jian Wu, Dan Science and Technology on Reactor System Design Technology Laboratory Sichuan Chengdu610041 China Key Laboratory of Low-grade Energy Utilization Technologies and Systems Chongqing University Ministry of Education Chongqing400044 China

ISBN: (纸本)9780791886410

ARSAC is a reactor system analysis program independently developed in China. In this paper, a quench analysis module is developed based on ARSAC program. The boiling curve suitable for quench process is established and several classical minimum film boiling temperature and models are implanted. The new program can reflect the influence of minimum film boiling temperature and heat transfer models on the quench process, thus it can be used to estimate the effect of surface oxidation and different cladding materials on the quenching process. The calculation results of the new program are in good agreement with the experimental data, and can better simulate the quench process of fuel element under LOCA. Copyright © 2022 by ASME.

关键词： Heat transfer

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NUMERICAL ANALYSIS ON FLOW AND HEAT TRANSFER CHARACTERISTICS OF LBE IN NARROW RECTANGULAR CHANNELS 30

NUMERICAL ANALYSIS ON FLOW AND HEAT TRANSFER CHARACTERISTICS...

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30th International Conference on Nuclear Engineering, ICONE 2023

作者： Jiang, Yanming Li, Xiaochang Tian, Ruifeng Lu, Chuan Song, Zhiguang College of Nuclear Science and Technology Harbin Engineering University Harbin China Heilongjiang Provincial Key Laboratory of Nuclear Power Plant Performance and Equipment Harbin Engineering University Harbin China College of Aerospace and Civil Engineering Harbin Engineering University Harbin China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

ISBN: (纸本)9784888982566

The lead-bismuth eutectic alloy (LBE) is a candidate coolant for the generation IV liquid metal reactors, and the plate-type fuel assemblies are widely used in the small or research reactors. However, the turbulent heat transfer behaviors of low Prandtl number LBE are quite different from that of ordinary fluids due to its violation in Reynolds analogy, and its flow and heat transfer process in narrow rectangular channels need to be studied with new methods. For this purpose, the authors conduct numerical simulation and analysis of turbulent flow of the LBE in narrow rectangular channel and compare the numerical simulation results with correlation proposed for liquid metal, moreover, the applicability of different near wall treatment methods, turbulence models and turbulent Prandtl number (Prt) models is compared. The focus of the analysis is on the impacts of the collocation of various models on the Nusselt number, the flow redistribution phenomena, as well as the difference in flow and heat transfer capacity in channels. According to the results, the suggested turbulence model and Prt model for different Peclet (Pe) numbers are recommended, besides the flow redistribution phenomenon in the three channels fuel assembly can be ignored, only slightly affects the flow and heat transfer in the narrow rectangular inlet region. © 2023 by JSME.

关键词： Turbulence models

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A Mixed-State Particle Filter for Remaining Useful Life Prediction of Lithium-Ion Batteries

SSRN

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SSRN 2024年

作者： Huang, Mengqi Du, Zhengyu Lu, Ruibo Wang, Xiaoji Peng, Changhong School of Nuclear Science and Technology University of Science and Technology of China Anhui Hefei230027 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Sichuan Chengdu610213 China

Lithium-ion batteries are extensively used in medical, transportation, industrial, and other applications due to rapid charging and discharging, constant power output, and light weight. Accurately predicting their remaining useful life (RUL) is essential for safe, reliable operation and timely maintenance. This paper presents a two-stage model based on symbolic regression and particle filter, aims to address the issues present in the current research on lithium-ion battery lifetime prediction. These issues include difficulties in early prediction, using a single degradation model, and the failure to consider the uncertainty of prediction. The proposed model constructs a fuzzy transition point between the two stages based on the degradation process similarity of history and operational batteries. Historical battery degradation data were employed to train the two-stage degradation model using symbolic regression. Parameter updating and state prediction of the degradation model were carried out using an improved mixed-state particle filter. This method can calculate the batteries RUL and their distribution. The performance was evaluated by analysing the CALCE and MIT datasets. The prediction error was less than 22 cycles, over 50% lower than the commonly used FCNN and LSTM timing prediction algorithms, demonstrating the feasibility and effectiveness of the method. © 2024, The Authors. All rights reserved.

关键词： Lithium-ion batteries

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Application of optimus in sensitivity analysis of dynamic response of reactor coolant system 27

Application of optimus in sensitivity analysis of dynamic re...

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27th International Congress on Sound and Vibration, ICSV 2021

作者： Yanli, Yuan Xianhui, Ye WenZheng, Zhang Lijuan, Li Zhenyu, Liu Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Sichuan Chengdu China

ISBN: (纸本)9788378807995

In this paper, the sensitivity of the dynamic response of reactor coolant system to the input parameters is investigated through OPTIMUS integrated platform, taking the stiffness of the dampers which support the steam generator and the main pump in the reactor coolant system as the input variables. OPTIMUS is a kind of software developed by Noesis Solutions Company, by which the multidisciplinary analysis process can be integrated for collaborative optimization design. OPTIMUS allows users to graphically establish workflows in which they define input files, output files, input parameters, output parameters and analysis tools that are needed to be called and the logical relationships between controls in the process. The dynamic response analysis of reactor system is the key process in the mechanical evaluation. With the continuous improvement of seismic design benchmark and reactor design requirements, the problem of structural stress over-limit is becoming more and more prominent, and the repeated iteration of design to evaluation becomes an inevitable trend. It is necessary to examine the sensitivity of the dynamic response to the key design parameters in the reactor system and find out the design parameters which have a great impact on the reactor dynamic response to shorten the design cycle and improve the design efficiency. In this paper, the sensitivity of the output parameters to the input parameters are investigated by OPTIMUS, considering the stiffness of dampers supporting the steam generator and the main pump as the input parameters, taking the supporting loads of the main equipments as the output parameters. Not only can ANSYS simulation calculations be automatically carried out on the OPTIMUS, but also can the output data be disposed automatically and rapidly. The sensitivity analysis results can be used for the determination of design variables in the subsequent optimization analysis. © "Advances in Acoustics, Noise and Vibration - 2021" Proceedings of

关键词： Sensitivity analysis

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Limit load estimation for finite plates with semi-elliptical defects under tensile loading 9

Limit load estimation for finite plates with semi-elliptical...

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9th Global Conference on Materials science and Engineering, CMSE 2020

作者： Shi, K.K. Fu, X.L. Xie, H. Shao, X.J. Tian, J. Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu Sichuan China

The ASME code allows the designer to circumvent many of the problems arising in design by elastic analysis by performing plastic or limit analysis of the component. Unlike elastic analysis, these analyses take account of the redistribution of stress upon yield. In limit analysis, the calculation of the limit load for finite plate with different semi-elliptical defects is an important stage for mechanical safety evaluation. The elastic compensation technique proposed by Mackenzie can be used to provide the limit load of a structure with a finite element method and aims at producing a suitable stress filed for the lower bound theory. In the present study, it is assumed that the finite plate exists three kinds of semi-elliptical cracks with low aspect ratio a/c (a/c=0.1, 0.5 and 1.0), respectively. The improved elastic compensation technique realized by finite element method is applied in the limit load estimation. At last, the results show that the improved elastic compensation technique can be used to obtain the limit value for the finite plate with different semi-elliptical defects under tensile loading. Moreover, the improved elastic compensation technique can be easily implemented in any finite element method and enables the limit load for any complex structure to be obtained swiftly. © Published under licence by IOP Publishing Ltd.

关键词： Finite element method

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Influence of unstable working conditions on friction torque of angular contact ball bearings 6

Influence of unstable working conditions on friction torque ...

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2023 6th World Conference on Mechanical Engineering and Intelligent Manufacturing, WCMEIM 2023

作者： Zhang, Ruoyu Yu, Yongjian Li, Jishun Xue, Yujun School of Mechatronics Engineering Henan University of Science and Technology Henan Luoyang China Henan Key Laboratory for Machinery Design and Transmission System Henan Luoyang China Longmen Laboratory Henan Luoyang China

The influence of rolling element material on friction torque of angular contact ball bearing under variable speed, variable load, and variable load conditions are studied. Based on the unstable working conditions of variable speed and load, the dynamic model of bearing is established by using CMD language in the ADAMS system, and the simulation analysis is carried out. The results show that under variable speed conditions, the shorter the acceleration time is, the greater the radial and axial loads are, and the greater the friction torque of the bearing is;Under variable load conditions, the friction torque of the bearing increases with the increase of load change frequency, and the friction torque of the hybrid ceramic ball bearing is smaller than that of the GCr15 rolling element bearing. The research results provide a reference for reducing the friction heat generation of bearings and improving the operation reliability of bearings under unstable working conditions. © Published under licence by IOP Publishing Ltd.

关键词： Angular contact ball bearings

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Comparisons of Subgrid-Scale Models for OpenFoam Large- Eddy Simulation 7

Comparisons of Subgrid-Scale Models for OpenFoam Large- Eddy...

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2020 7th International Conference on Computer-Aided design, Manufacturing, Modeling and Simulation, CDMMS 2020

作者： Feng, Zhipeng Qi, Huanhuan Huang, Xuan Liu, Shuai Liu, Jian Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu Sichuan China

OpenFOAM is a free, open-source software package that can be used for the solutions of computational fluid dynamics and simulation of various fluid flow processes. Nevertheless, OpenFOAM still lacks default settings and a large number of different numerical schemes and turbulent models should be validated. In this paper, the unsteady flow around a cylinder (Re=3900) is calculated by the large eddy simulation of OpenFOAM. The predictions include the drag and lift coefficient, the pressure distribution around the cylinder, the velocity distribution and Reynolds stress distribution in the wake region, as well as the prediction of the recirculation length and separation angle. Thanks to several simulations, these five subgrid-scale (SGS) models are compared and studied: The Smagorinsky SGS model, wall adaptive local eddy visibility SGS model, dynamic SGS model with Lagrangian averaging, dynamic one equation eddy visibility model, one equation eddy visibility model. The numerical results are verified with the published experimental data. © Published under licence by IOP Publishing Ltd.

关键词： Large eddy simulation

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Verification Method and Basic Guarantee of RPS Availability in Nuclear Power Plant 5th

Verification Method and Basic Guarantee of RPS Availability ...

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5th International Symposium on Software Reliability, Industrial Safety, Cyber Security and Physical Protection of Nuclear Power Plant, ISNPP 2020

作者： He, Xian-Jian Liu, Ming-Ming Zhang, Qing Luo, Xiao-Jun Wen, Jing Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China

ISBN: (纸本)9789811634550

The third generation nuclear power reactor protection system (RPS) based on computer technology, that is, safety DCS system, is designed with large-scale integrated circuits and real-time embedded software, which has the characteristics of complex structure, large system scale and high verification difficulty. In order to ensure the safe operation and economic benefits of nuclear power plants, RPS needs not only reliability and stability, but also high availability. In order to explore the feasibility of verification of DCS availability index, based on Hualong One safety DCS engineering prototype, a set of availability testing methods and basic guarantee conditions suitable for DCS suppliers are summarized for discussion and exchange. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Nuclear power plants

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