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Study on core control strategy for initial cycle utilizing gadolinium burnable poisons

Hedongli Gongcheng/Nuclear Power Engineering 2010年第SUPPL. 2期31卷 102-106页

作者： Liu, Qi-Wei Yu, Ying-Rui Science and Technology on Reactor System Design Technology Laboratory Chengdu 610041 China

Based on the present MODE-G control strategy, an improved new core control strategy is developed for the initial cycle utilizing gadolinium burnable poisons. With the relaxed axial offset control (RAOC) procedure to limit the core axial offset (AO) in a band region, load follow operations are simulated under the improved core control strategy and the simulation results are compared with those obtained using MODE-G control strategy. Additionally, a preliminary evaluation of the impact of the an ejected rod with the improved core control strategy is performed. It is shown that the improved core control strategy can control the core axial power distribution more satisfactorily and effectively.

关键词： Gadolinium

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Analysis of physical performance of two-row hexagonal fuel assembly for SCWR

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Hedongli Gongcheng/Nuclear Power Engineering 2010年第SUPPL. 2期31卷 83-87页

作者： Wang, Lian-Jie Qin, Dong Li, Qing Yao, Dong Science and Technology on Reactor System Design Technology Laboratory Chengdu 610041 China

A new hexagonal fuel assembly(FA) design which has two rows of fuel rods between the hexagonal moderator channels is proposed for the thermal supercritical water cooled reactor(SCWR). The two-row hexagonal fuel assembly concept is first and foremost considered for the performance of uniform moderation and sufficient moderation, and with the respect of structural performance and thermal-hydraulic performance. The physical performance of the two-row hexagonal FA with acceptable configuration is investigated. The results show clearly that a better balance between uniform moderation and sufficient moderation can be obtained in the two-row hexagonal fuel assembly. The design objective of the local power peaking factor less than 1.10 can be achieved under the condition of using the same enrichment fuel and containing no burnable poison.

关键词： Nuclear power plants

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Effect of piezoelectric constants on mechanical properties of PFC

Effect of piezoelectric constants on mechanical properties o...

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作者： Liu, Y.G. Li, J.S. Li, L. Shen, X. Henan Key Lab. for Machinery Design and Transmission System Henan University of Science and Technology Luoyang Henan 471003 China Aeronautical Key Lab. for Smart Materials and Structures Nanjing University of Aeronautics and Astronautics Nanjing Jiangsu 210016 China

ISBN: (纸本)9781424463503

Piezoelectric actuators offered many advantages including quick response, high-induced stress, low energy consumption and low cost, which made them very attractive for a number of applications. However, some disadvantages, especially the low induced displacement and the typical isotropic laminate layers, deeply limit their applications requiring off-axis or twisting motions. Piezoelectric Fiber Composites are one of the new type piezoelectric devices for actuators, since it has obvious anisotropy as well as high toughness that couldn't be gotten from normal piezoelectric actuators. Piezoelectric Fiber Composites are denominated by piezoelectric fiber, polymer and interdigitated electrode layer. In order to improve the performance of Piezoelectric Fiber Composites, two piezoelectric unit's construct functions about longitudinal length extension vibration mode are established. According to the construct functions for piezoelectric actuator, some finite models are established. Then the mechanical properties are analyzed in detail. The anisotropy is characterized. ANSYS is employed to numerically research the influence of piezoelectric constants on the Piezoelectric Fiber Composites' stress. Several rules are summed. The results show much high stress can be obtained by increasing elastic modulus E 3, Poisson's ratio μ12, μ13, or decreasing elastic modulus E1, shear modulus G13, dielectric coefficient Ε11, Ε33. © 2010 IEEE.

关键词： Piezoelectric actuators

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Research on control and operation support integrated system for nuclear power plants

Research on control and operation support integrated system ...

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International Conference on Computer, Mechatronics, Control and Electronic Engineering (CMCE)

作者： Chen Zhi Chen Deng-ke Zhang Yao Yu Ren National key laboratory of design technology of nuclear reactor system Nuclear Power Institute of China (NPIC) Chengdu China Department of nuclear power science and engineering Naval university of engineering Wuhan China

ISBN: (纸本)9781424479573

At present, the information and control system (I&C) and operation support system (OSS) of the nuclear power plants (NPPs) are designed separately; their structures and functions are independent. So, the compatibility, availability and dependability of them are not desirable, and the comprehensive advantages of them are not to exert fully. In order to resolve these problems, this paper presents a new idea that designing and developing the I&C and the OSS coordinately, so that their structures and functions are integrated. Firstly, this paper reviewed the evolution and application status of the OSS. And then, the realization methods and forms for the integrated system are analyzed. At last, the hierarchy and architecture of the integrated system which have the double-functions of the I&C and OSS is founded. Analysis and study is also carried out in terms of the hierarchy and characteristics of the integrated system.

关键词： Europe Instruments Reliability engineering Maintenance engineering

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The mechanical performance of piezoelectric fiber composite actuators

The mechanical performance of piezoelectric fiber composite ...

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International Conference on Electrical and Control Engineering, ICECE 2010

作者： Liu, Yong-Gang Li, Ji-Shun Tian, Bin Wang, Xiu-Jun Shen, Xing Henan Key Lab. for Machinery Design and Transmission System Henan University of Science and Technology Luoyang Henan 471003 China Academy of Information Technology Luoyang Normal University Luoyang Henan 471022 China Xuzhou Meritor Axle Co. Ltd. Xuzhou Jiangsu 221116 China Aeronautical Key Lab. for Smart Materials and Structures Nanjing University of Aeronautics and Astronautics Nanjing Jiangsu 210016 China

ISBN: (纸本)9780769540313

The piezoelectric fiber composite actuators are new kind of piezoelectric actuators which have high mechanical performance and flexibility. In order to raise the induced strain of piezoelectric fiber composite actuators, two piezoelectric unit's construction equations about longitudinal length extension vibration mode are established. According to the construction equations for piezoelectric actuators, some finite models are established. Then the performance of mechanics is analyzed in detail. The anisotropy is characterized. ANSYS is employed to numerically research the influence of piezoelectric constants on the piezoelectric fiber composite actuators' induced strain. The distribution of induced strain is given by FEM. Several rules are summed. The results show much high induced strain can be obtained by increasing elastic modulus E1, Poisson's ratio μ12, and decreasing elastic modulus E3, shear modulus G13, dielectric coefficient Ε11 and Ε33. © 2010 IEEE.

关键词： Piezoelectric actuators

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An innovative algorithm for reactor core loading pattern optimization

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Hedongli Gongcheng/Nuclear Power Engineering 2010年第SUPPL. 2期31卷 88-91页

作者： Gong, Zhao-Hu Yao, Dong Wang, Kan Department of Engineering Physics Tsinghua University Beijing 100084 China Science and Technology on Reactor System Design Technology Laboratory Chengdu 610041 China

To solve the reactor loading pattern optimization problem in realistic nuclear power plants, this paper presents a new optimization method - Interval Bound Algorithm, and introduces the origin of the algorithm and describes its implementation procedure. Based on this algorithm, the corresponding parallel loading pattern optimization code of IBALPO is developed using Fortran95. Finally, this code system is used to solve a realistic and difficult reload problem to show its performance, and a better pattern is obtained compared to the one searched by experienced engineers.

关键词： Nuclear power plants

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Development of neutronic and thermal-hydraulic couple code of AHRs and preliminary investigation on bubble distribution

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Hedongli Gongcheng/Nuclear Power Engineering 2010年第SUPPL. 2期31卷 79-82页

作者： Wang, Liang-Zi Yao, Dong Wang, Kan Department of Engineering Physics Tsinghua University Beijing 100084 China Science and Technology on Reactor System Design Technology Laboratory Chengdu 610041 China

The absence of radiolytic-gas bubbles strongly affects the steady operation of Aqueous Homogeneous reactors (AHRs), and because of the buoyancy and collision effects, the bubble behavior and their steady distribution in the reactor is always hard to predict. Now, computation methods of AHRs always use a function to express the bubble distribution approximately. Related investigation shows that in CFX, using Multiple Size Group (MUSIG) model, the multi-phase simulation results predict the bubble behavior well, and tally with the experimental results of an AHR. This paper firstly introduces the neutronic and thermal-hydraulic couple code FMCAHR_CFX, and in the last chapter, FMCAHR_CFX is used for a preliminary analysis of a simple AHR.

关键词： Radiation chemistry

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An Anti-jamming Counting Approach for Pulse Signal of Displacement Sensor

An Anti-jamming Counting Approach for Pulse Signal of Displa...

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The 2010 International Conference on Computer Application and system Modeling(2010计算机应用与系统建模国际会议 ICCASM 2010)

作者： Hongbiao Han Jishun Li School of Mechatronics Engineering Henan University of Science and Technology Luoyang Henan China Henan Key Lab for Machinery Design and Transmission System Luoyang Henan China

ISBN: (纸本)9781424472352

This paper analyzes the variation of A-phase and Bphase pulse signals that displacement sensor outputs. A new anti-jamming counting approach is designed according to Gray code. This counting approach does not cause error count and counting precision is improved by four times frequency count. The principle of hardware and software is indroduced in two application examples. In the first example, the input ports of AT89C52 MCU are connected to the outputs of hand rotary encoder. The MCU constantly checks the state of inputs in the timer interrupt and counts with this counting approach, then the count value is transferred to host computer through the RS422 interface. In the other example, the outputs of optical encoder are connected to the I/O ports of CPLD/FPGA chip which can count with this counting approach. Then the count value is transferred to host MCU/DSP through data lines. The applications resulted that the approach is good and the hardware circuit is simple, stable and reliable. The method has a certain practical value and can be applied to the antijamming counting for the other sensors which have the same output waveform.

关键词： encoder pulse count anti-jamming

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A series of power reconstruction methods based on solving diffusion equation approximately in node

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Hedongli Gongcheng/Nuclear Power Engineering 2010年第SUPPL. 2期31卷 63-67页

作者： Zhao, Wen-Bo Hu, Yong-Ming Wang, Kan Yao, Dong Zhang, Guo-Shu Feng, Kai-Ming Department of Engineering Physics Tsinghua University Beijing 100084 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China Science and Technology on Reactor System Design Technology Laboratory Chengdu 610041 China

Based on approximately solving diffusion equation in node, a series of reconstruction methods are developed for NGFMN code. These methods are categorized by hyperbolic functions, boundary conditions and the order of Legendre polynomials utilized in equation solving. 2D IAEA and 2D BIBLIS benchmarks have been solved. The numerical results are compared with those from CITATION, and the reconstruction method with smaller errors is selected.

关键词： Hyperbolic functions

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The Mechanical Performance of Piezoelectric Fiber Composite Actuators

The Mechanical Performance of Piezoelectric Fiber Composite ...

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International Conference on Electrical and Control Engineering (ICECE)

作者： Yong-gang Liu Ji-shun Li Xiu-jun Wang Bin Tian Xing Shen Henan Key Lab for Machinery Design and Transmission System Henan University of Science and Technology Luoyang Henan China Academy of Information Technology Luoyang Normal University Luoyang Henan China Xuzhou Meritor Axle Co. Ltd Xuzhou Jiangsu China Aeronautical Key Lab for Smart Materials and Structures Nanjing University of Aeronautics and Astronautics Nanjing Jiangsu China

The piezoelectric fiber composite actuators are new kind of piezoelectric actuators which have high mechanical performance and flexibility. In order to raise the induced strain of piezoelectric fiber composite actuators, two piezoelectric unit's construction equations about longitudinal length extension vibration mode are established. According to the construction equations for piezoelectric actuators, some finite models are established. Then the performance of mechanics is analyzed in detail. The anisotropy is characterized. ANSYS is employed to numerically research the influence of piezoelectric constants on the piezoelectric fiber composite actuators' induced strain. The distribution of induced strain is given by FEM. Several rules are summed. The results show much high induced strain can be obtained by increasing elastic modulus E 1 , Poisson's ratio μ 12 , and decreasing elastic modulus E 3 , shear modulus G 13 , dielectric coefficient ε 11 and ε 33 .

关键词： Actuators Strain Optical fiber polarization Optical fiber devices Mathematical model Dielectrics Equations

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