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Top Fuel 2016: LWR Fuels with Enhanced Safety and Performance

作者： Li, Wenjie Tang, Changbing Liu, Zhenhai Li, Wei Chen, Ping Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China Design Sub-institute Nuclear Power Institute of China Chengdu610213 China

ISBN: (纸本)9780894487309

FCM fuel is a candidate fuel form to replace commercial UO2 fuel rod in LWR to enhance fuel reliability under accident conditions. The FCM pellet consists of TRISO particles embedded inside the dense SiC matrix. This fuel design is more complex than conventional LWR fuel, which needs new fuel performance models or analysis tools to assist fuel design and concept evaluation. In this paper an attempt was made to develop a finite element method to analyze FCM fuel pellet thermal-mechanical performance. Three idealized cases of normal operation, power ramp, and LOCA were analyzed. The results showed that the temperature distribution and stress distribution of FCM pellet exhibited a strong non-uniformity. The irradiation strain and creep of buffer layer and PyC layers had a strong effect on the mechanical performance of FCM pellet. The hoop stresses of SiC layers and SiC matrix increased significantly during the LOCA and varied with radial positions.

关键词： Finite element method

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Preliminary analysis of core heat-up for ATFs under accident conditions

Preliminary analysis of core heat-up for ATFs under accident...

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Top Fuel 2016: LWR Fuels with Enhanced Safety and Performance

作者： Li, Wei Chen, Ping Su, Guanghui Qiu, Suizheng Tian, Wenxi Li, Wenjie School of Nuclear Science and Technology Xi'an Jiaotong University Xi'an Shaanxi710049 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu Sichuan610213 China

ISBN: (纸本)9780894487309

Experience gained in decades of nuclear safety research and previous nuclear accidents direct to the investigation of passive safety system design and accident-tolerant fuel (ATF) system which is now becoming a hot research point in the nuclear energy field. The ATF system is aim at upgrading safety characteristics of the nuclear fuel and cladding in a reactor core where active cooling has been lost, and is preferable or comparable to the conventional UO2-Zr fuel system when the reactor is in normal operation. By virtue of advanced materials with improved basic properties and oxidation resistance, the ATF system is placed high hopes on slowing down the accident progression, allowing wider margin of time for the mitigation measures to be effective. SiC and FeCrAl accident-tolerant claddings and FCM accident-tolerant fuel are considered in this work, as they are receiving more and more attention in China. In this paper, the improved performance of UO2-SiC, UO2-FeCrAl, FCM-SiC and FCM-FeCrAl fuel systems on the core heat-up progress in a pressurized water reactor (PWR) is analyzed by using the best-estimate system code RELAP5 and severe accident analysis program respectively. For this purpose two accident scenarios are selected, e.g., a large break LOCA as a design base accident and an extended station blackout (SBO) severe accident, to reflect the accident-tolerance characteristic of ATFs. Obtained quantitative results show promising safety enhancement in terms of peak cladding temperature (PCT) and recovery of the core coolability for the selected ATF systems, which is beneficial for further down-selections of various kinds of ATF systems.

关键词： Silicon carbide

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Investigation on contact angle of ball bearings

Investigation on contact angle of ball bearings

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作者： Wang, Fengtao Jing, Minqing Fan, Hongwei Wei, Yaobing Zhao, Yang Liu, Heng State Key Lab for Strength and Vibration of Mechanical Structures Xi'An Jiaotong University Xi'an China Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System Xi'An Jiaotong University No. 28Xianning West Road Xi'an Shaanxi710049 China School of Mechanical and Electrical Engineering Lanzhou University of Technology Lanzhou China School of Mechanical Engineering Xi'An University of Science and Technology Xi'an China

As an important structure parameter, contact angle is also a judgement factor for the working performance of ball bearings. However, under some conditions, the ball may roll over the raceway shoulder, and contact angle is not enough for estimating this phenomenon. Thus, edge angle and edge distance are proposed as compensatory judgement factors in the current study. A six-degree dynamic model with time-varying contact stiffness was developed for investigating effects of initial contact angle, raceway groove curvature factors, number of balls, axial load, shaft speed, friction coefficient and raceway misalignment on contact angle, contact stiffness, edge angle and edge distance. Inapposite initial contact angle may make the ball roller over the raceway shoulder, inner raceway misalignment have significant influences on the stable motion of ball bearings, and more harmonics frequencies about contact angle appear. Comparison of contact angle from presented model with Jones-Harris model under axial load shows reasonable qualitative agreement. © IMechE 2016.

关键词： Contact angle

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Demo Abstract: Observability-driven sensor deployment in smart academic environments 14

Demo Abstract: Observability-driven sensor deployment in sma...

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14th ACM Conference on Embedded Networked Sensor systems, SenSys 2016

作者： Agarwal, A. Jaiswal, K. Gudhaka, U. Munigala, V. Ramamritham, Krithi Karmakar, Gopinath Department of Computer Science Engineering Indian Institute of Technology Bombay United States Reactor Control System Design Section Bhabha Atomic Research Centre India

ISBN: (纸本)9781450342636

Saving energy without causing discomfort and without de-manding human intervention is the need of the day. It is important to develop sensor systems which not only satisfy user requirements, but also take energy consumption into consideration. In this demo, we present the sensing subsys-tems of a Smart Academic Environment, based upon the core concept of Observability' [1] which-while satisfying user needs-helps to reduce the number of sensors required. © 2016 Copyright held by the owner/author(s).

关键词： Observability

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Artificial Thermal Sensation: Stretchable Skin‐Like Cooling/Heating Device for Reconstruction of Artificial Thermal Sensation in Virtual Reality (Adv. Funct. Mater. 29/2020)

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Advanced Functional Materials 2020年第29期30卷

作者： Jinwoo Lee Heayoun Sul Wonha Lee Kyung Rok Pyun Inho Ha Dongkwan Kim Hyojoon Park Hyeonjin Eom Yeosang Yoon Jinwook Jung Dongjun Lee Seung Hwan Ko Applied Nano and Thermal Science Lab Department of Mechanical Engineering Seoul National University 1 Gwanak‐ro Gwanak‐gu Seoul 08826 Korea Interactive and Networked Robotics Laboratory Department of Mechanical Engineering Seoul National University 1 Gwanak‐ro Gwanak‐gu Seoul 08826 Korea Thermochemical Energy System R&D Group Korea Institute of Industrial Technology 89 Yangdaegiro‐gil Ipjang‐myeon Seobuk‐ku Cheonan‐si Chungcheongnam‐do 31056 Korea Institute of Advanced Machinery and Design (SNU‐IAMD)/Institute of Engineering Research Seoul National University Gwanak‐ro Gwanak‐gu Seoul 08826 Korea

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On the lift force modeling for single bubble in water 3

On the lift force modeling for single bubble in water

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3rd International Topical Meeting on Advances in Thermal Hydraulics 2016, ATH 2016

作者： Li, Zhongchun Song, Xiaoming Jiang, Shengyao Ishii, Mamoru Science and Technology on Reactor System Design Technology Laboratory Chengdu610041 China Nuclear Power Institute of China Chengdu610041 China Tsinghua University Beijing100084 China Department of Nuclear Engineering Purdue University 47906 United States

ISBN: (纸本)9780894487330

Lift force is one of the interfacial momentum transfer terms in the framework of two-fluid modeling. It is vital for accurate understanding of two phase flow system. The present study concluded the lift force modeling and correlations proposed using analytical, experimental and numerical approaches. The correlations were assessed with the existing experimental and numerical simulation results. The regions where insufficient data and contradictions between modeling and experimental data were presented were identified. A strategy for the lift force modeling was proposed based on the similarity between drag force and lift force. In addition, the effects of bubble size, fluid properties, contamination and shear flow rate were discussed. © 2016, American Nuclear Society. All rights reserved.

关键词： Shear flow

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Influence of Sn addition on mechanical properties of gas tungsten arc welded AM60 Mg alloy sheets

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Transactions of Nonferrous Metals Society of China 2016年第8期26卷 2051-2057页

作者： Jun GOU Ai-tao TANG Fu-sheng PAN Jia SHE Su-qin LUO Jun-hua YE Da-wei SHI College of Materials Science and Engineering Chongqing University Chongqing 400044 China National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing 400044 China Chongqing Academy of Science and Technology Chongqing 401123 China Science and Technology on Reactor System Design Technology Laboratory College of Materials Science and Engineering Guilin University of Technology Guilin 541004 China

The effects of Sn addition on the microstructure and mechanical properties of gas tungsten arc butt-welded Mg?6Al?0.3Mn (AM60) (mass fraction, %) alloy sheets were investigated by optical microscopy, scanning electron microscopy, X-ray diffraction, transmission electron microscopy, and microhardness and tensile tests. The results indicate that both the average microhardness and joint efficiency of AM60 are improved by the addition of 1% Sn (mass fraction). The ultimate tensile strength of Mg?6Al?1Sn?0.3Mn (ATM610) reaches up to 96.8% of that of base material. Moreover, fracture occurs in the fusion zone ofATM610 instead of in the heat-affected zone of AM60 welded joint. The improvement in the properties is mainly attributed to the formation of Mg2Sn, which effectively obstructs the grain coarsening in the heat-affected zone, resulting in a relatively finemicrostructure. The addition of 1% Sn improves the mechanical properties of AM60 welded joint

关键词： AM60 Mg alloy ATM610 Mg alloy gas tungsten arc welding mechanical properties

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RANS simulation of natural convection in an enclosure with curved surface heating from below 3

RANS simulation of natural convection in an enclosure with c...

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3rd International Topical Meeting on Advances in Thermal Hydraulics 2016, ATH 2016

作者： Chai, Xiang Chen, Bin Xu, Cheng School of Nuclear Science and Engineering Shanghai Jiao Tong University 800 Dongchuan RD. Minhang District Shanghai China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China Karlsruhe Institute of Technology Kaiserstr. 12 Karlsruhe76131 Germany

ISBN: (纸本)9780894487330

Prediction accuracy of natural convection is strongly dependent on the choice of turbulence model. In this paper, different turbulence models as well as turbulent heat flux models are employed to predict the natural convection in an enclosure with curved surface heating from below and investigate their performance. Based on the simulation results, it is found that k-Ε model which is well known to overestimate the production of kinetic energy provides a higher prediction of Nusselt number while k-Ε-ζ-f model provides a relatively smaller estimation. A systematic CFD simulation is carried out for Rayleigh numbers in the range 109 to 1011, with which the influence from aspect ratio is also investigated. The effect of Rayleigh number on heat transfer is found to be significant and the dependency of Nusselt number (Nu) is obtained as a function of Rayleigh number (Ra). The influence from the aspect ratio of the simulation domain is found to be dependent on the choice of turbulence model. For k-Ε model, Nu increases as aspect ratio increases, while an opposite dependency is observed when k-Ε-ζ-f model is used. For this discrepancy, arguments are provided based on the streamlines and the profiles of Nu over the heating surface. © 2016, American Nuclear Society. All rights reserved.

关键词： Natural convection

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Human and smart machine co-learning with brain computer interface

arXiv

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arXiv 2018年

作者： Lee, Chang-Shing Wang, Mei-Hui Ko, Li-Wei Prof, Naoyuki Kubota Lin, Lu-An Kitaoka, Shinya Wang, Yu-Te Su, Shun-Feng Computer Science and Information Engineering National Cheng Kung University Tainan Taiwan Taiwan National Chiao Tung University Hsinchu Taiwan Institute of Bioinformatics and Systems Biology National Chiao Tung University Taiwan Nagoya University Nagoya Japan Department of System Design Tokyo Metropolitan University Tokyo Japan OASE Lab. NUTN Taiwan Dwango Media Village DWANGO Co. Ltd. Japan La Jolla Swartz Center for Computational Neuroscience UCSD United States Purdue University West LafayetteIN United States Department of Electrical Engineering National Taiwan University of Science and Technology Taiwan

Machine learning has become a very popular approach for cybernetics systems, and it has always been considered important research in the Computational Intelligence area. Nevertheless, when it comes to smart machines, it is not just about the methodologies. We need to consider systems and cybernetics as well as include human in the loop. The purpose of this article is as follows: (1) To integrate the open source Facebook AI Research (FAIR) DarkForest program of Facebook with Item Response Theory (IRT), to the new open learning system, namely, DDF learning system;(2) To integrate DDF Go with Robot namely Robotic DDF Go system;(3) To invite the professional Go players to attend the activity to play Go games on site with a smart machine. The research team will apply this technology to education, such as, playing games to enhance the children concentration on learning mathematics, languages, and other topics. With the detected brainwaves, the robot will be able to speak some words that are very much to the point for the students and to assist the teachers in classroom in the future. Copyright © 2018, The Authors. All rights reserved.

关键词： Social networking (online)

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A new model for active nucleation site density in boiling systems 3

A new model for active nucleation site density in boiling sy...

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3rd International Topical Meeting on Advances in Thermal Hydraulics 2016, ATH 2016

作者： Li, Quan Avramova, M. Yu, Junchong Jiao, Yongjun Hou, Jason Department of Engineering Physics Tsinghua University Beijing100084 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China Department of Nuclear Engineering North Carolina State University RaleighNC27695 United States

ISBN: (纸本)9780894487330

A new model for active nucleation site density in boiling systems has been developed. The model is based on parametric analysis of existing experimental data and is a function of wall superheat, pressure, and contact angle. The model is applicable for a wide pressure range - from 0.101 MPa to 19.8 MPa. Preliminary studies of temperature dependency of the contact angle have also been performed. The new model is intended to improve the predictions of the interfacial area concentration in two-fluid models and the wall temperature in subcooled boiling simulations. Validation activities have shown that the active nucleation site density predicted by the new model is in a good agreement with various published experimental data, and have demonstrated the achieved improvements as compared to existing models. © 2016, American Nuclear Society. All rights reserved.

关键词： Contact angle

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