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Study on optimization of shutdown and critical model for VVER-1000

Hedongli Gongcheng/Nuclear Power Engineering 2013年第SUPPL.1期34卷 80-83+98页

作者： Lu, Zong-Jian Liu, Tong-Xian Wang, Jin-Yu Wu, Lei Yu, Ying-Rui National Key Laboratory of Reactor System Design Technology Nuclear Power Institute of China Chengdu 610041 China

On the premise of safety, economy is one of the important objectives of nuclear power plants. For VVER-1000, there are several cases of operation modes when the plant is off the grid, such as the critical operation after refueling, the hot shutdown and critical operation, and the critical operation after test. For the purpose to reduce the time of the operations, the consumption of materials, and the amount of waste water produced, the optimization researches are carried out on these cases. The qualitative and quantitative analysis is carried out, on the configurations of the control rod and boric acid, which are the important factors to influence the shutdown and critical operations. The general steps and the basic principles of the optimizations are described. Three cases are optimized.

关键词： Boric acid

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design of a new solution for the wheeled hopping robot

Design of a new solution for the wheeled hopping robot

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UKACC International Conference on Control (CONTROL)

作者： Jingjing Liu Hongbo Wang Hongnian Yu Lili Zhang Luige Vladareanu Adrian Bruja Gal I. Alexandru Parallel Robot and Mechatronic System Laboratory of Hebei Province Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University Qinhuangdao China College of Electrical Engineering Yanshan University Qinhuangdao China School of Design Engineering and Computing Bournemouth University Poole UK Robotics and Mechatronic Department Institute of Solid Mechanics Bucharest Romania

In recent years many researchers are trying to combine wheeled movement with legged movement or hopping movement to strengthen the robots adaptability to environment. Hybrid robots are playing a more and more important role in our modern life. However, their controls are mostly complicated. So in this paper we present a new solution for the wheeled hopping robot. Based on the mechanical design, this robot has two movement modes: wheeled and hopping movement mode. While the center of gravity of the mechanism is under the wheels center, the wheeled hopping robot which is like a tumbler can keep its stability even when the wheels' velocity is zero. In this paper, we firstly introduce the description and design of the wheeled hopping robot. Then we explain how to choose the robot parameters and lastly we describe, how the robot through hopping, successfully traverses obstacles and ditches.

关键词： Mobile robots Shafts Wheels Springs Robot kinematics Force

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Optimum Structural Material Option of reactor Vessel Internals in PWR Nuclear Power Plant

Optimum Structural Material Option of Reactor Vessel Interna...

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第三届核电厂材料与安全可靠性国际研讨会 (3rd MRNPP Symposium)

作者： WANG Qing-tian Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China610041Chengdu

As a key equipment,reactor Vessel Internals influence the safety of nuclear power *** is a rigid requirement to stock of reactor Vessel Internals because of the high temperature,high pressure and high dose *** the stainless steel usually used in different nations,the paper analyze the corrosion resistance property,weldability and irradiation property and recommend the optimum stock option.

关键词： PWR reactor Vessel Internals Stock Corrosion Opinion

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A 3-transistor CMOS active pixel with in-pixel correlated double sampling

A 3-transistor CMOS active pixel with in-pixel correlated do...

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2013 IEEE International Conference of Electron Devices and Solid-State Circuits, EDSSC 2013

作者： Liu, Shaohua Jiang, Lai Yu, Hang Li, Yan Xi, Dao Ming Xie, Qingguo Shenzhen City Key Laboratory of Embedded System Design College of Computer Science and Software Engineering Shenzhen University Shenzhen China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology HUST Wuhan China

ISBN: (纸本)9781467325233

This paper presents a 3-transistor CMOS active pixel structure with in-pixel correlated double sampling. designed in a standard 0.18 μm CMOS process, the structure effectively suppresses temporal noise and fixed pattern noise (FPN), thanks to the shared correlated double sampling circuit inside the pixel. Fill factor is also improved while maintaining pixel performance. Validation by Spectre simulator shows that the proposed structure suppresses 100 mV input offset to the microvolt range, and the pixel readout time is ∼90 ns. The average power consumption of each pixel is 18 μW. © 2013 IEEE.

关键词： Pixels

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Supercritical water-cooled reactor CSR1000 core thermal-hydraulics characteristics analysis

Supercritical water-cooled reactor CSR1000 core thermal-hydr...

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LWR Fuel Performance Meeting, Top Fuel 2013

作者： Bi, Shumao Lu, Chuan Lu, Jianchao Li, Xiang Zeng, Xiaokang Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China No. 25 3rd Section South 2nd Ring Road Chengdu Sichuan 610041 China CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology Nuclear Power Institute of China No.25 3rd Section South 2nd Ring Road Chengdu Sichuan 610041 China

ISBN: (纸本)9781629937212

CSR1000(China Supercritical water-cooled reactor with the rated electric power of 1000 MWe) put forward by NPIC (Nuclear Power Institute of China) proposed a new design of fuel assembly cluster with two-pass core arrangement. In this paper, subchannel analysis code ATHAS which has added new heat transfer and friction coefficient correlations obtained from experiment on T/H characteristics of SCW carried out by NPIC has been used to analyze the thermal-hydraulics characteristics of CSR1000. The subchannel analysis results have shown that the design basically meets the requirements of thermal-hydraulics design and remains some margins for safety analysis.

关键词： Friction

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Implicit generalized predictive control for electrical heating box with multi-loop control

Implicit generalized predictive control for electrical heati...

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Chinese Control Conference (CCC)

作者： Fang Yang Zhao-hui Yuan Henan University of Science and Technology Henan Key Laboratory for Machinery Design and Transmisson System China Northwestern Nontechnical University School of Automation China

Electrical heating box with multi -loop control has several features as great inertia and coupling. It is a type of multi-variable system. To solve the problem, a kind of decoupling designed implicit generalized predictive control (IGPC) method is discussed. The Multi-variable IGPC based on decoupling design. Using decentralized objective function and feedforward decoupling, the decoupling IGPC is achieved to control a multi -variable system. According to input and output data, the parameters of optimal control law could be identified through use of Recursive Least Squares (RLS). This method avoids solving Diophantine equations by online. The IGPC is used for control electrical heating box with three multi-loops through simulation study. In the test process, compared with the IGPC effect and traditional PID control effect and analyzed the control effect through changing softness parameter. The test results show that the IGPC could eliminate the coupling between loops and have good control stability.

关键词： Predictive control Electronic mail Resistance heating Educational institutions Couplings Mathematical model Laboratories

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Eddy current pulsed thermography for fatigue evaluation of gear

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AIP Conference Proceedings 2014年第1期1581卷 1652-1662页

作者： Gui Yun Tian Aijun Yin Bin Gao Jishan Zhang Brian Shaw School of Automation Engineering University of Electronic Science and Technology of China Chengdu Sichuan 611731 P. R. China and School of Electrical and Electronic Engineering Newcastle University Newcastle upon Tyne NE1 7RU United Kingdom State Key Laboratory of Mechanical Transmission College of Mechanical Engineering Chongqing University P. R. China and School of Electrical and Electronic Engineering Newcastle University Newcastle upon Tyne NE1 7RU United Kingdom Design Unit School of Mechanical Engineering and System Newcastle University Newcastle upon Tyne NE1 7RU United Kingdom

The pulsed eddy current (PEC) technique generates responses over a wide range of frequencies, containing more spectral coverage than traditional eddy current inspection. Eddy current pulsed thermography (ECPT), a newly developed non-destructive testing (NDT) technique, has advantages such as rapid inspection of a large area within a short time, high spatial resolution, high sensitivity and stand-off measurement distance. This paper investigates ECPT for the evaluation of gear fatigue tests. The paper proposes a statistical method based on single channel blind source separation to extract details of gear fatigue. The discussion of transient thermal distribution and patterns of fatigue contact surfaces as well as the non-contact surfaces have been reported. In addition, the measurement for gears with different cycles of fatigue tests by ECPTand the comparison results between ECPT with magnetic Barkhausen noise (MBN) have been evaluated. The comparison shows the competitive capability of ECPT in fatigue evaluation.

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A 3-transistor CMOS active pixel with in-pixel correlated double sampling

A 3-transistor CMOS active pixel with in-pixel correlated do...

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IEEE Conference on Electron Devices and Solid-State Circuits

作者： Shaohua Liu Lai Jiang Hang Yu Yan Li Dao ming xi Qingguo Xie Shenzhen City Key Laboratory of Embedded System Design College of Computer Science and Software Engineering Shenzhen University Shenzhen China Shenzhen City Key Laboratory of Embedded System Design College of Computer Science and Software Engineering Shenzhen University Shenzhen China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology HUST Wuhan China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan China

This paper presents a 3-transistor CMOS active pixel structure with in-pixel correlated double sampling. designed in a standard 0.18 μm CMOS process, the structure effectively suppresses temporal noise and fixed pattern noise (FPN), thanks to the shared correlated double sampling circuit inside the pixel. Fill factor is also improved while maintaining pixel performance. Validation by Spectre simulator shows that the proposed structure suppresses 100 mV input offset to the microvolt range, and the pixel readout time is ~90 ns. The average power consumption of each pixel is 18 μW.

关键词： CMOS integrated circuits

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A CMOS time-to-digital converter for multi-voltage threshold method in positron emission tomography

A CMOS time-to-digital converter for multi-voltage threshold...

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IEEE Conference on Electron Devices and Solid-State Circuits

作者： Yan Li Hang Yu Lai Jiang Zhen Ji Jun Zhu Ming Niu Peng Xiao Shenzhen City Key Laboratory of Embedded System Design College of Computer Science and Software Engineering Shenzhen University Shenzhen China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781467325240

Avoiding use of traditional high-speed analog-to digital converters (ADCs) and constant fraction discriminators, multi-voltage threshold (MVT) method is able to digitally sample positron emission tomography (PET) scintillation pulse with reasonable cost. As the key component of the MVT method, a time-to-digital convertor (TDC) with high resolution and large dynamic range is presented in this work. The TDC architecture uses a delay locked loop (DLL) to generate the fast clock edges from a 100 MHz clock, and a 32-stage Vernier delay lines (VDL) is used to achieve the 40pS timing resolution. The proposed TDC is designed using the standard 0.25 μm CMOS technology with 2.5V normal supply voltage. The power consumption of the TDC is ~70 mW.

关键词： CMOS integrated circuits Delays Image edge detection CMOS technology Pulse measurements Cities and towns

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The effect of battery temperature on total fuel consumption of fuel cell hybrid vehicles

The effect of battery temperature on total fuel consumption ...

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作者： Zheng, C.H. Kim, N.W. Park, Y.I. Lim, W.S. Cha, S.W. Xu, G.Q. Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen University Town 1068 Xueyuan Avenue Shenzhen 518055 China Shenzhen Key Laboratory of Electric Vehicle Powertrain Platform and Safety Technology Shenzhen China School of Mechanical and Aerospace Engineering/SNU-IAMD Seoul National University Bldg. 301 #1505 San 56-1 Daehak-dong Gwanak-gu Seoul 151-742 Korea Republic of Department of Mechanical System Design Engineering Seoul National University of Science and Technology 172 Gongreung 2-dong Nowon-gu Seoul 139-743 Korea Republic of Department of Mechanical and Automotive Engineering Seoul National University of Science and Technology 172 Gongreung 2-dong Nowon-gu Seoul 139-743 Korea Republic of

In order to consider the effect of battery temperature on the total fuel consumption when a Pontryagin's Minimum Principle (PMP)-based power management strategy is applied to a fuel cell hybrid vehicle (FCHV), this paper designates the battery temperature as a second-state variable other than the battery state of charge (SOC) and defines a new costate for the battery temperature in the control problem. The PMP-based power management strategy is implemented in a computer simulation and the relationship among the final values of the two state variables and the total fuel consumption is illustrated based on the simulation results. This relationship is defined as an optimal surface in this research. Using the optimal surface, it can be concluded that considering the battery temperature effect in the PMP-based power management strategy improves the fuel economy of the FCHV. Potential fuel economy gains attributed to consideration of the battery temperature effect are also determined based on the optimal surfaces. Crown Copyright © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

关键词： Fuel economy

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