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2018 International Congress on Advances in Nuclear Power Plants, ICAPP 2018

作者： Wu, Xiaoli Li, Wei Deng, Jian Deng, Chunrui Hou, Liqiang Zhang, Dan Yuan, Hongsheng Science Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China

ISBN: (纸本)9780894487552

MAAP5 is capable of simulating the whole response of a PWR nuclear power plant under severe accident conditions. An analysis of the severe accident scenarios in a PWR by MAAP5 were carried out. It was assumed that the severe accident was initiated by an unusual smallbreak loss-of-coolant accident (SBLOCA) at the reactor pressure vessel (RPV) lower head and the failure of highpressure injection system (HPIS) in a PWR by using MAAP5 were carried out. Different break sizes with and without manual depressurization of the reactor coolant system (RCS) were studied. The results showed that without manually depressurization the RCS, reactor core underwent slow heatup and completely melted and eventually failed the RPV lower head at the primary system pressure of 6.87 MPa for 0.4-inch-break LOCA and 2.71 MPa for 1.0-inch-break LOCA. On the other hand, timely manually opening the pressurizer (PZR) safety valves (SVs) was an effective mitigation measure to recover the core coolabilty by cold-leg accumulator injection system (AIS) and low-pressure injection system (LPIS). Besides, reasonably manually opening the steam generators (SGs) SVs while keeping the auxiliary feedwater work also helped to depressurize the RCS and prevent the severe accident. Both of the two mitigation measures successfully prevented the core from complete melt, but the latter one is preferable to the former one provided no steam generator tube rupture took place. © 2018 American Nuclear Society. All rights reserved.

关键词： Loss of coolant accidents

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Development and application of pumping unit monitoring system based on wireless dynamometer sensor node 5

Development and application of pumping unit monitoring syste...

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2020 5th International Conference on Minerals Source, Geotechnology and Civil Engineering, MSGCE 2020

作者： Luo, Wang Zhinan Sheng, Yin Sujun, Yang Shihai, Hua Demin, Chen Marine Design and Research Institute of China Shanghai200011 China Beijing Beetech Corp. Beijing100085 China Science and Technology on Water Jet Propulsion Laboratory Shanghai200011 China Shanghai Key Laboratory of Ship Engineering Shanghai200011 China Wuxi Beetech Sensor Inc. Wuxi214024 China

For the problems of the complicated installation and removal of dynamometer card detection equipment, high cost, not convenient for real-time detection, prone to failure and maintenance workload, a kind of low cost wireless dynamometer is developed. With the implement of wireless transmission gateway, comprehensive monitoring software is programmed. This system consists of a pumping dynamometer, gateway, monitoring software and indicator diagram measuring algorithm. Finally, the wireless dynamometer was installed at RenQiu oil field, and the data shows that the system works well and can be used for the long-term working and operating state of pumping oil field monitoring. © Published under licence by IOP Publishing Ltd.

关键词： Dynamometers

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Preliminary study on few group cross section representation method based on model tree algorithm

Preliminary study on few group cross section representation ...

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2018 International Conference on Physics of reactors: reactor Physics Paving the Way Towards More Efficient Systems, PHYSOR 2018

作者： Zhao, Wenbo Ju, Haitao Yu, Yingrui Chai, Xiaoming Yu, Junchong Peng, Xingjie Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China

ISBN: (纸本)9781713808510

The tabular representation of few-group cross section is widely used for node wise two-step core simulations. However, it may take too much memory usage for pin-by-pin two-step simulations. A few-group cross section representation method for PWR has been developed to reduce memory usage in this paper. The few-group cross sections are represented as the sum of a base term and a collection of partial terms. Each of these terms is fitted by modified model tree. The case matrix of training data set is similar with that of the conventional methods such as the piece wise interpolation and the tabular representation. Two modifications have been made for the model tree algorithm: 1) burnup is the only variable to split data set, 2) linear regression method on nodes of the tree is replaced with polynomial fitting method according to priori knowledge of the relationship between cross sections and state variables. Through the modifications accuracy and generalization ability are achieved without the pruning procedure. Then the lattice calculations for test data set could be canceled. Tests on the typical PWR lattice are performed. Numerical results show that for the worst case the memory usage of this method is less than 30% of the tabular representation, when the maximum error of reactivity is less than 500 pcm. The memory usage for other cross sections is less than 10% with high accuracy. Optimization of the target tolerance criteria should be tested for fast group cross sections. Large errors in thermal group absorption and fission production cross sections lead to large errors in Kinf and it needs more study on regression model. The method combined with the tabular representation might be more suitable for the pin-by-pin two-step simulations. © 2018 International Conference on Physics of reactors, PHYSOR 2018: reactor Physics Paving the Way Towards More Efficient Systems. All rights reserved.

关键词： Errors

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Detached Eddy Simulation on the Flow Around NACA0021 Airfoil Beyond Stall Using OpenFOAM 1

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Asia-Pacific International Symposium on Aerospace technology, APISAT 2018

作者： Wang, Yue Liu, Kang Han, Zhonghua National Key Laboratory of Science and Technology on Aerodynamic Design and Research School of Aeronautics Northwestern Polytechnical University Xi’an710072 China

ISBN: (数字)9789811333057

ISBN: (纸本)9789811333040

Accurate simulation of high Reynolds number flow around airfoils beyond stall is a challenging computational fluid dynamics (CFD) problem of significant importance in aerospace industry. In this study, detached eddy simulations (DES) have been performed on the flow around NACA0021 airfoil beyond stall at 60° angle of attack. Detailed investigations are carried on the effect of time step, the effect of span-wise length and the effect of grid resolution, respectively. The present DES results show good agreements with the experimental data and some other published pioneering work. The DES model in OpenFOAM shows a good capacity in the prediction of unsteady flow with separation and vortex shedding. Compared to the unsteady Reynolds-averaged Navier-Stokes (URANS) simulation, DES simulations show visible improvements on the prediction of force coefficients and the flow structures. © 2019, Springer Nature Singapore Pte Ltd.

关键词： Airfoils

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Insights into the fretting corrosion behavior and damage mechanism of Inconel 690TT in water and steam environments containing different dissolved oxygen levels

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Corrosion science 2025年 253卷

作者： Bian, W.W. Liu, X. Wang, F. Xiao, J. Zhang, X.F. Han, Y.Q. Cheng, Z.Y. Shoji, T. School of Materials Science and Engineering Inner Mongolia University of Science and Technology Baotou014010 China Inner Mongolia Key Laboratory of New Metal Material Inner Mongolia University of Science and Technology Baotou014010 China Reactor Engineering Technology Research Institute China Institute of Atomic Energy Beijing102413 China Nuclear Materials Division State Power Investment Corporation Research Institute Beijing102209 China National Center for Materials Service Safety University of Science and Technology Beijing Beijing100083 China Frontier Research Initiative New Industry Creation Hatchery Center Tohoku University 6-6-10 Aramaki Aoba Aoba-ku Aoba-ku980-8579 Japan

The fretting corrosion behavior and damage mechanism of Inconel 690TT in high-temperature pressurized (HTP) water and steam environments containing different dissolved oxygen levels were investigated. Adhesive wear in a steam environment significantly reduced wear volume and depth, and higher oxygen partial pressure in a steam environment was more conducive to internal oxidation. The formation of the glazed layer in a high-oxygen environment decreased wear volume, wear depth, and friction coefficient. The subsurface of wear scar under low-oxygen steam conditions exhibited complex layered nano-structure while relatively simple under high-oxygen steam conditions. Finally, the formation mechanisms of various layered nano-structures were revealed. © 2025 Elsevier Ltd

关键词： Fretting corrosion

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Multiple branches coupling property and design of PRHRs

Multiple branches coupling property and design of PRHRs

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AISTech 2018 Iron and Steel technology Conference and Exposition

作者： Zhuohua, Zhang Xu, Ran Feng, Li Lin, Xian Ke, Zhou Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China

ISBN: (纸本)9781935117728

Nuclear reactor applied on ship or floating platform recommend miniaturization and optimization of PRHRs. Due to much larger volume and heat transfer area in PRHRs heat exchanger, miniaturization and design of PRHRs need consider many constraints such as volume and systems configuration in containment. In normal reactor design such constraints are not so rigorous, but in reactor design for floating platform it takes significant difficulties. A multiple branches coupling system is constructed in the paper which describes the actual relationship between PRHRs and other systems or equipment, and by combining temperature distribution in heat exchanger and conservation equations of coupling system, the design parameters set satisfied design requirement can be calculated and optimization of design can be completed by programming solving method. © 2018 by AIST.

关键词： Heat transfer

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Research on the response of core barrel under random turbulence excitation 25

Research on the response of core barrel under random turbule...

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25th International Congress on Sound and Vibration 2018: Hiroshima Calling, ICSV 2018

作者： Huang, Xuan Wu, Wan-Jun Qi, Huan-Huan Feng, Zhi-Peng Liu, Shuai Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu Sichuan China

ISBN: (纸本)9781510868458

The flow-induced vibration of reactor structures is directly related to nuclear safety and has long been closely watched by the nuclear engineering community. A large number of theoretical, experimental and numerical analysis research work are carried out at home and abroad. In one hand, the test means cost a lot of money and time;on the other hand due to the restriction of test conditions, we only can get the measurement results about part of the structure under specific conditions. Therefore, from the design point of view, the theoretical or numerical analysis methods should be developed to predict structural flow induced vibration response in order to compensate for the lack of test methods. For the purpose of completing the flow-induced vibration analysis of the components in the reactor, it is necessary to analyse the vibration characteristics of the components in the reactor. According to the fluid excitation situation, this paper based on the test study two kinds of core barrel calculation method of forced vibration response under turbulent excitation. The advantages and disadvantages of these two methods are described from the aspects of calculation model, calculation input, analysis method and calculation result. © 25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling. All rights reserved.

关键词： Vibration analysis

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Dynamic Compression Deformation Behavior of Laser Directional Energy Deposited Α+Β Duplex Titanium Alloy with Basket-Weave Morphology

SSRN

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SSRN 2022年

作者： Fang, Cheng Huaming, Wang Zhuo, Li Xu, Cheng Zheng, Dongdong Zhang, Shuquan Xu, Hu Zhang, Hao Liu, Min School of Materials Science and Engineering Beihang University 37 Xueyuan Road Beijing100191 China National Engineering Laboratory of Additive Manufacturing for Large Metallic Components Beihang University 37 Xueyuan Road Beijing100191 China Ningbo Institute of Technology Beihang University Ningbo315800 China Department of Frontier & Innovation Research Wuhan Second Ship Design & Research Institute Wuhan430064 China School of Materials Science and Engineering

Duplex titanium alloy with basket-weave morphology made by laser directional energy deposition (LDED) technique, has a bright application prospect in the armor protection field attributed to its excellent specific strength and bulletproof performance. In this research, the dynamic compressive deformation mechanisms of LDEDed TC11 titanium alloy under a strain rate of 3000/s are systematically investigated by investigating the dislocation slipping and twinning behavior. Meanwhile, this work gives explanations of the microstructure evolution of subsequent heterogeneous shear localization. The results indicate that TC11 alloy with basket-weave morphology possesses huge improvement in the average dynamic flow stress, uniform plastic strain, and the impact absorption energy in contrast to that of titanium alloys with an equiaxed microstructure, which is known as the optimum prepared via traditional forming methods. The loading direction to α laths is largely responsible for slip modes manifestation under dynamic compression, which is illustrated in the unit triangle. When loading along at the vertex of the unit triangle, both basal slip and prismatic slip systems could not be motivated. When loading along directions within the unit triangle, either or both basal slip and prismatic slip systems could be activated, causing α lath twisting, rotation, or even refinement. Meanwhile, the Schmid factors reduction caused by α laths rotation results in the {10-12} twinning, which will reduce the slip mean free path. During the heterogeneous shear localization, the adiabatic shear bands (ASB) formation finally leads to shear failure. The α laths within the transition zone in ASB are compressed to less than 200 nm in thickness. Ultrafine nanoscale equiaxed grains with few defects in the center zone of ASB are generated under dislocations pile-up and sub-grain rotation. © 2022, The Authors. All rights reserved.

关键词： Morphology

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The implicit runge kutta method for solving point burnup equations

The implicit runge kutta method for solving point burnup equ...

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2018 Transactions of the American Nuclear Society, ANS 2018

作者： Cai, Yun Peng, Xingjie Li, Qing Qin, Dong Jiang, Zhumin Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China

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Computational Study of Halogen-Halogen Interactions in Polyhalide Ionic Liquids

Research Square

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Research Square 2021年

作者： Xu, Yanmin Zhang, Jiaqiang Yang, La Zhang, Yifei Xu, Zhijian Lu, Yunxiang Key Laboratory for Advanced Materials School of Chemistry & Molecular Engineering East China University of Science and Technology Shanghai200237 China Drug Discovery and Design Center Shanghai Institute of Materia Medica Chinese Academy of Sciences Shanghai201203 China

Recent years have seen many specific applications of polyhalide ionic liquids (ILs) such as oxidizing solvents for metals and alloys, immersion fluids for optical mineralogy, and electrolyte components for dye-sensitized solar cells. In this work, interhalogen interactions in a set of polyhalide ILs composed of polyhalide anions, [X3]−, [X5]− and [X7]− (X = I or Br), with two typical cations, tetramethylammonium [NMe4]+ and 1,3-dimethylimidazolium [DMIM]+, were thoroughly studied from a computational point of view. In addition, a halogen-bonded supramolecular anion, [C6F13-I∙∙∙I∙∙∙I-C6F13]−, was also taken into account for comparison. Unlike those in bare polyhalide ions, halogen-halogen interactions in ionic pairs for the investigated ILs are somewhat asymmetric caused by the interactions between the cations and the anions. Most interhalogen contacts in ionic pairs have some covalent content, while I∙∙∙I interactions in the complexes of the supramolecular anion are purely noncovalent. In general, there are two classes of interhalogen bonds in ionic pairs: one class with longer X∙∙∙X distances shows primarily ionic character, while the other with shorter distances has a larger degree of covalency, i.e. intermediate ionic/covalent nature. © 2021, CC BY.

关键词： Ionic liquids

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