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Information Engineering (ACIE), IEEE Asia Conference on

作者： Jie Chen Kai Xiao Mengwei Mengwei Zhao Zhao Ke Huang Pengcheng Yang Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

Accurate and reliable modeling and simulation is the key prerequisite for intelligent control technology research of nuclear power plant. For the nuclear steam supply system (NSSS) of small pressurized water reactor under bi-stable steady state operation scheme, this paper firstly establishes the models of the core, regulator, steam generator and other components. Then, the nuclear steam supply system platform (NSSSP) of small pressurized water reactor is built based on Matlab/Simulink. Simulations are carried out to analyze the normal operation transient and load rejection transient in the water supply flow control mode. The accuracy and reliability of NSSSP are verified to beconsistent with the commercial program RETRAN.

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Research and Verification of the One-Step Resonance and Transport Methods Based on the Openmoc Code

SSRN

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SSRN 2024年

作者： Zhao, Chen Wang, Lianjie Chen, Zhang Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

With the continuous improvement of computer hardware capabilities, the one-step method in reactor physics has become one of the important research directions in recent two decades. OpenMOC is an open-source MOC code developed by MIT, with C++/Python hybrid programming and three-dimensional transport calculation capabilities. Based on the OpenMOC code, the following work was carried out. Firstly, the global-local resonance method with multi-group and continuous neutron libraries was researched and established. Next, based on the 2D and 3D MOC solver, the 2D/1D and the MOC/DD transport methods were realized in OpenMOC. Finally, verification of the transport and resonance methods was conducted using the C5G7 macro benchmark and the VERA micro benchmark. The numerical results demonstrated that the average eigenvalue deviation was 44pcm and average maximum pin power distribution deviation was 0.37% in the VERA-2 benchmark, which showed the good accuracy of the resonance method. As for the transport method, 3DMOC method exhibited better accuracy in strong anisotropic cases, but the computational time was 38 times that of the 2D/1D method. © 2024, The Authors. All rights reserved.

关键词： Computer hardware

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Research on Hybrid Modeling Method Based on Mechanism Model and BP Neural Network

Research on Hybrid Modeling Method Based on Mechanism Model ...

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Information Engineering (ACIE), IEEE Asia Conference on

作者： Jie Chen Yanqiu Zheng Qing Chu Guanfu Jiang Jing Li Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

reactor system modeling is the premise of reactor control system design. The common commercial thermal and hydraulic analysis programs like RELAP5, RETRAN have complex structure and slow operational speed, which are not conductive to the transplantation and improvement of reactor system. In order to realize the rapid development of reactor control system, this paper carries out the mechanism modeling of the reactor system in Matlab/Simulink, and then introduce BP neural network to establish the hybrid model, which improves the modeling accuracy to support the design of reactor system. For small pressurized water reactor, we firstly take analytical modeling method to build the core mechanism model and its state space model through three conservation principles and the operating mechanism of core. Based on analyses, we can conclude that the parameter error and structural error of the mechanism model is caused by the assumption and simplification during modeling, and choose the parameter with the most influence (the feedback coefficient of the coolant temperature) as the corrected parameter in the BP neural-based hybrid modeling process. After that, according to the dual constant operation scheme of small pressurized water reactors, and the gradient descent method of BP network, the hybrid model of core is built and the parameter error and structure error of the mechanism modeling are corrected online. The simulation results show that the proposed hybrid modeling method can accurately simulate the reactor operate state. Thus, the proposed hybrid model is accurate and effective.

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Prediction of Electromagnetic Shielding Effectiveness of DCS Cabinet Based on Neural Network 7th

Prediction of Electromagnetic Shielding Effectiveness of DCS...

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7th International Symposium on Digital Instrumentation and Control technology for Nuclear Power Plant, SICPNPP 2023

作者： Zhang, Xu Yang, You-wei Yang, Jing-hua Li, Jun Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China PowerChina Sichuan Electric Power Engineering Co. Ltd Chengdu610041 China

ISBN: (纸本)9789819934546

The shielding effectiveness (SE) of structural components is one of the important indicators of electromagnetic compatibility (EMC) performance, and it is related to the size, material, frequency and test points position in the structure. The measurement of SE is governed by a variety of factors. SE of structural components is affected by the measuring antenna size which is adopted to different frequencies and the testability of certain observation points. To address this issue, this paper introduces an example of the SE of DCS cabinet of nuclear power plant control system, where the neural network algorithm was used to build the relationship between spatial location and SE in the cabinet at specified frequency, so that the SE of unknown points could be predicted by the SE of known points. Besids, the model parameters were optimized by training with a large amount of data, the HPR1000 safety-class DCS cabinet was adopted for the verification, and high prediction accuracy was obtained. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Nuclear power plants

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Emergent antisymmetric wrinkling patterns in films on ridged substrates

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science China(Physics,Mechanics & Astronomy) 2023年第11期66卷 179-187页

作者： Jiahui Zhang Yi Sun Linghui He Yong Ni CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsCAS Center for Excellence in Complex System MechanicsUniversity of Science and Technology of ChinaHefei230026China

We report the formation of antisymmetric wrinkling patterns in films on ridged substrates induced by the buckling instability of the substrates via finite element simulations and *** simulated results reveal that the uniaxial compression along the ridge can trigger both the wrinkling instability of the film and the lateral buckling instability of the *** latter could change the wrinkles from a symmetric pattern to an antisymmetric pattern in a range of film-substrate modulus ratio and aspect ratio of the ridge profile,as validated by the experimental observations.A three-dimensional phase diagram with four buckling patterns,i.e.,sole ridge buckling pattern,antisymmetric wrinkling pattern with different wavelengths from ridge buckling,symmetric wrinkling pattern without ridge buckling,and antisymmetric wrinkling pattern with the same wavelength as ridge buckling,is built with respect to the uniaxial compression,modulus ratio,and aspect *** results not only elucidate how and when the interplay between the wrinkling instability and the ridge instability results in the formation of the antisymmetric wrinkling pattern but also offer a way to generate controllable complex wrinkling patterns.

关键词： wrinkling pattern buckling instability ridged film-substrate system antisymmetric wrinkles

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Gas Leakage-based Fault Prediction for a Boron-coated Proportional counter 15

Gas Leakage-based Fault Prediction for a Boron-coated Propor...

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15th IEEE Global Reliability and Prognostics and Health Management Conference, PHM-Beijing 2024

作者： Wang, Miao Wei, Wenbin Wan, Bo Huang, Qichang Sun, Shangqing Lu, Weiwei Wu, Chenlu Hong, Shixin Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China CNNP Guodian Zhangzhou Energy Co. Ltd. China Nuclear Power Engineering Co. Ltd. Zhangzhou China

ISBN: (数字)9798350354010

ISBN: (纸本)9798350354010

Large reaction cross-sections, low operating voltage, extended lifespan, good stability, and suitability for high-temperature and intense gamma radiation settings are among the features of boron-coated proportional counter tubes. Consequently, it has been extensively employed in the nuclear-measuring system outside of the reactor, where the source range detector is a boron-coated proportional counter tube. This paper studies boron-coated proportional counter tubes using a comprehensive approach that combines Monte Carlo simulation with lifespan prediction in health management. The wavelet packet decomposition approach was used to extract feature information from the pulse signals of the boron-coated proportional counter tube. A counter tube defect prediction model was established based on a multi-kernel correlation vector machine, where the impact of different wavelet packets and correlation vector machine kernel functions on the model's prediction performance was examined. The study's findings demonstrated that the particle swarm optimization algorithm-optimized multi-kernel correlation vector machine model exhibited superior prediction accuracy for the counter tubes' future operating conditions. The primary goal is to comprehend how gas loss affects gas pressure and to determine the lifespan of detectors within a detector system. © 2024 IEEE.

关键词： Proportional counters

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Determining the nuclear temperature dependence on source neutron-proton asymmetry in heavy-ion reactions at intermediate energy

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Chinese Physics C 2023年第5期47卷 152-159页

作者：曲国峰黄宇郑华刘星泉 R.Wada 林炜平黄美容韩纪锋任培培杨振雷张鑫冷强钟 Key Laboratory of Radiation Physics and Technology of the Ministry of Education Sichuan UniversityChengdu 610064China Institute of Nuclear Science and Technology Sichuan UniversityChengdu 610064China School of Physics and Information Technology Shaanxi Normal UniversityXi'an 710119China Cyclotron Institute Texas A&M UniversityCollege StationTexas 77843USA College of Physics and Electronics information Inner Mongolia University for NationalitiesTongliao 028000China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610213China

In this article,we investigate the dependence of nuclear temperature on emitting source neutron-proton(N/Z)asymmetry with light charged particles(LCPs)and intermediate mass fragments(IMFs)generated from intermediate-velocity sources in thirteen reaction systems with different N/Z asymmetries,^(64)Zn on^(112)Sn,and^(70)Zn,^(64)Ni on^(112,124)Sn,^(58,64)Ni,^(197)Au,and^(232)Th at 40 MeV/*** apparent temperature values of LCPs and IMFs from different systems are deduced from the measured yields using two helium-related and eight carbon-related double isotope ratio thermometers,***,the sequential decay effect on the experimental apparent temperature deduction with the double isotope ratio thermometers is quantitatively corrected explicitly with the aid of the quantum statistical *** present treatment is an improvement compared to our previous studies in which an indirect method was adopted to qualitatively consider the sequential decay effect.A negligible N/Z asymmetry dependence of the real temperature after the correction is quantitatively addressed in heavy-ion reactions at the present intermediate energy,where a change of o.1 units in source N/Z asymmetry corresponds to an absolute change in temperature of an order of 0.03 to 0.29 MeV on average for LCPs and *** conclusion is in close agreement with that inferred qualitatively via the indirect method in our previous studies.

关键词： nuclear temperature N/Z asymmetry dependence Albergo thermometer sequential decay correction heavy-ion reactions at intermediate energy

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Privacy-Preserving Hierarchical Anonymization Framework over Encrypted Data

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, Information and systems 2024年第10期144卷 1011-1019页

作者： Jia, Jing Saito, Kenta Nishi, Hiroaki Graduate School of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama223-8522 Japan Department of System Design Faculty of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama223-8522 Japan

Smart cities, which can monitor the real world and provide smart services in a variety of fields, have improved people’s living standards as urbanization has accelerated. However, there are security and privacy concerns because smart city applications collect large amounts of privacy-sensitive information from people and their social circles. Anonymization, which generalizes data and reduces data uniqueness, is an important step in preserving the privacy of sensitive information. However, anonymization methods frequently require large datasets and rely on untrusted third parties to collect and manage data, particularly in a cloud environment. In this case, private data leakage remains a critical issue, discouraging users from sharing their data and impeding the advancement of smart city services. This problem can be solved if the computational entity performs anonymization without obtaining the original plain text. This study proposed a hierarchical k-anonymization framework using homomorphic encryption and secret sharing composed of two types of domains. Different computing methods are selected flexibly, and two domains are connected hierarchically to obtain higher-level anonymization results efficiently. The experimental results show that connecting two domains can accelerate the anonymization process, indicating that the proposed secure hierarchical architecture is practical and efficient. © 2024 The Institute of Electrical Engineers of Japan.

关键词： Anonymity

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Geometric characteristics of single bead fabricated by continuous fiber reinforced polymer composite additive manufacturing

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Materials Today: Proceedings 2022年 70卷 431-437页

作者： Zhang, Guoquan Wang, Yaohui Qiu, Wanglin Dong, Ke Xiong, Yi School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen 518055 China

Continuous fiber-reinforced polymer composite additive manufacturing (CFRP-AM) provides an efficient and effective solution to fabricate composites with intricate designs and high performance that are unattainable with conventional composite manufacturing technologies. The geometric characteristic of a single bead is essential information for process improvement and planning of CFRP-AM but has not been reported yet. This study investigates the geometric attributes of single bead fabricated by continuous fiber-reinforced polymer composite additive manufacturing to provide researchers insights into the relationship between geometry design and performance of fabricated parts. The width of beads fabricated by various process settings is characterized and modeled with response surface models. Moreover, the influence of the geometry design, e.g., curvatures and turning angles, are qualitatively studied and analyzed. Corresponding benchmark toolpaths are proposed for characterization studies. Lastly, the performance of two CFRP-AM platform configurations, i.e., three degree-of-freedom gantry and six-degree-of-freedom articulated types, are compared in terms of the geometric accuracy of typical features. © 2022

关键词： 3D printers

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Multi-physics Coupling Analyses of Nuclear Thermal Propulsion reactor 23rd

Multi-physics Coupling Analyses of Nuclear Thermal Propulsio...

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23rd Pacific Basin Nuclear Conference, PBNC 2022

作者： Han, Wenbin Guan, Zechuan Huang, Shanfang Deng, Jian Department of Engineering Physics Tsinghua University Beijing China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China China Institute of Atomic Energy Beijing China

ISBN: (纸本)9789819910229

Nuclear thermal propulsion (NTP) reactors have high-temperature solid-state characteristics and significant thermal expansion, which therefore require multi-physics coupling analyses. In this paper, the framework of Neutronics, Thermal-Hydraulics and Mechanics coupling (N/T-H/M) of nuclear thermal propulsion reactor is developed, and the typical reactor XE-2 is analyzed with this method. The results show that the N/T-H/M coupling will bring -1049 pcm negative reactivity, of which the thermal expansion effect accounts for 22%, indicating that the nuclear thermal propulsion reactor has a certain capacity for self-regulation. However, thermal expansion will lead to 0.88 mm peak deformation and 233 MPa peak stress, which will severely threaten the mechanical tolerance of the materials. Therefore, there is a trade-off between the advantages and disadvantages of the high-temperature solid-state core while designing NTP reactors. © 2023, The Author(s).

关键词： Thermal expansion

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