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SSRN 2023年

作者： Guo, Jia Ming, Yang Zhao, Fulong Fang, Huawei Yin, Jingwei Tian, Ruifeng College of Nuclear Science and Technology Harbin Engineering University Harbin150001 China Heilongjiang Provincial Key Laboratory of Nuclear Power System & Equipment Harbin Engineering University Harbin150001 China Key Laboratory of Nuclear Reactor System Design Technology of China Nuclear Power Research and Design Institute Chengdu610000 China

Small nuclear reactor (SMR) system has many advantages, including low construction cost, short construction period and fast economic benefits. SMR has broad prospects in power supply in remote areas, small power grids, low-temperature heating, nuclear hydrogen production, seawater desalination, nuclear powered ships, etc. In order to study the hydraulics and thermal parameters of supercritical carbon dioxide as coolant in SMR, this paper developed a supercritical carbon dioxide reactor sub-channel analysis program based on Modelica language. Based on the sub-channel analysis method, the reactor coolant flow channel is divided in several control bodies, then the program calculates hydraulics and thermal parameters of each control body. In order to verify the correctness of the model and program, sub-channel program will calculate the axial temperature distribution, radial temperature distribution, coolant flow rate and power level under steady-state conditions. Then compare these calculations with KAIST MMR in Korea. In the transient characteristic analysis, this paper will analyze the reactor power increase, reactivity insertion and coolant flow loss accident, then evaluate the safety performance of the reactor. This paper relies on theoretical modeling and program development method, studying the sub-channel thermal hydraulic characteristics of steady-state and transient conditions, which provides theoretical reference and program support for the study of transient response characteristics and safety characteristics of supercritical carbon dioxide reactor. © 2023, The Authors. All rights reserved.

关键词： Temperature distribution

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Synthetic subnanochannels in porous aromatic frameworks accelerate selective water permeation in membrane desalination

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Science china Materials 2022年第7期65卷 1920-1928页

作者： Lei Wang Panpan Zhang Kaikai Chen Junchao Dong Feng Luo Qinglin Huang Zhixia Sun Xiaoqin Zou Guangshan Zhu Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education Faculty of ChemistryNortheast Normal UniversityChangchun 130024China Institute of Chemical and Industrial Bioengineering Jilin Engineering Normal UniversityChangchun 130052China State Key Laboratory of Separation Membranes and Membrane Processes Tiangong UniversityTianjin 300387China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610213China

Creation of freeways in a membrane accelerates water transport for efficient desalination;however,the synthesis of target membrane materials is very *** the present study,the molecular-design strategy is developed for the synthesis of porous aromatic framework(PAF)membranes with rigid and open networks to regulate water ***-based monomers in triangle shape are designed for the construction of PAF-98 and its sister frameworks,and these PAF membranes are formed through trifluoromethanesulfonic acid *** rigidity and geometry of the monomers endow PAFs with unique structures of connected pores with edging size(4.5–6.7Å)between water(2.8Å)and hydrated sodium molecules(7.2Å),enabling effective differentiation of water and *** fabricated membranes with high flexibility and continuity are ideal for water desalination,and reverse osmosis experiments demonstrate that the three PAF membranes are selective for permeation of water molecules over hydrated sodium *** water flux of 547.1 L m^(-2) h^(-1) and high rejection degree of 90%are obtained on a representative membrane of PAF-98-E;and the desalination performance is superior to currently available membrane ***,PAF-98-E membrane is capable of rejecting various cations with high efficiency in real seawater,holding great promise in practical water desalination application.

关键词： porous aromatic framework water sieving reverse osmosis molecular design membrane desalination

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Multiscale microstructure-based constitutive modeling of high-temperature creep rupture in post-irradiated ODS steels

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Journal of Materials Research and technology 2025年 36卷 8037-8047页

作者： Xiaobao Fu Zhenyu Zhao Zeyuan Yan Yuntao Zhong Dengke Chen Ruiqian Zhang Bin Liu Qihong Fang Jia Li State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Mechanical and Vehicle Engineering Hunan University Changsha 410082 PR China State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 PR China Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of China Chengdu 610213 PR China Department of Engineering Mechanics School of Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai 200240 PR China

Oxide dispersion strengthened (ODS) steel exhibits the great potential as structural materials in nuclear energy production, owing to the complex interface between the oxide particles and the matrix to enhance the resistance of radiation damage. However, the impact of irradiation-induced defects on the thermal creep rate and resistance of ODS steel currently remains inadequately understood. The point defect concentration with the increasing time is predicted, and the coarsening of oxide particles is quantitatively evaluated during the creep using the Ostwald ripening theory. Considering the irradiation-induced microstructure, a modified thermal creep rate model is proposed, and the thermal creep rate and creep strain of irradiated ODS steel are predicted at different temperatures. The results show that the thermal creep rate reaches 3 × 10 −5 s −1 at the temperature of 500 °C and stress of 200 MPa, while the thermal creep strain does not exceed 3 % at the temperature of 800 °C. The average size and number density of the irradiated ODS steel are 8.34 nm and 2.72 × 10 18 m −3 . Meanwhile, the effect of the activation energy on the thermal creep life is predicted at different temperatures. The thermal creep life is maintained in the higher temperature range, even exceeding 10,000 h at 600 °C for irradiated ODS steels. High temperature causes the increased dislocation activity, and the coarsened oxide particles effectively hinder dislocation motion, thereby maintaining structural stability. This work aims to shed light on the influence of post-irradiation microstructure on the thermal creep performance of irradiated ODS steels, ultimately leading to the improved prediction of creep life.

关键词： Irradiation Oxide dispersion strengthening Point defect Thermal creep rate

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Effect of Fecral Sublayer Composition on the Microstructure, Mechanical Properties and Corrosion Resistance of Fecral/Ysz Composite Coatings

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SSRN 2023年

作者： Zhu, Changda Qiu, Xi Li, Yuanming Zhang, Wei Yang, Jian Zhong, Yilong Deng, Jiuguo Zhou, Mingyang Liu, Ning Yang, Jijun Key Laboratory of Radiation Physics and Technology of Ministry of Education Institute of Nuclear Science and Technology Sichuan University Chengdu610064 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China

The effect of FeCrAl sublayer composition on the microstructure, mechanical properties and lead-bismuth eutectic (LBE) corrosion behavior of the FeCrAl/YSZ composite coatings were systematically investigated. The results show that the FeCrAl sublayer as a diffusion barrier and bonding layer is beneficial to improve the mechanical properties and corrosion resistance of the coatings. After corrosion, a slow-growing, continuous and protective Al-rich oxide is formed at the interface between the YSZ and FeCrAl sublayer, which can effectively hinder the inward diffusion of oxygen atoms and the outward diffusion of iron atoms. Especially, the Fe12Cr9Al/YSZ coating exhibits the best corrosion resistance even after corrosion at 700°C. The microscopic corrosion mechanism of FeCrAl/YSZ coating is elucidated. © 2023, The Authors. All rights reserved.

关键词： Eutectics

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Thermal-Hydraulic Characteristics of Helical Cruciform Single Rod Based on Cfd Investigation

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SSRN 2024年

作者： Chen, Yiwen Zhang, Dalin Jiang, Dianqiang Deng, Jian Zhang, Xisi Wang, Xinan Tian, Wenxi Qiu, Suizheng Su, Guanghui State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi’an Jiaotong University Xi’an710049 China Nuclear Power Institute of China 328 Changshun Avenue Chengdu610213 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China China Institute of Atomic Energy Beijing611731 China

To increase power density in nuclear reactors, the helical cruciform fuel (HCF) is designed as a fundamental element. HCF takes advantages of strong mixing effects, self-supporting features, and strengthened heat transfer, potential to increase the fuel performance in nuclear reactors. In this paper, friction factor and heat transfer coefficient empirical correlations of HCF single rod cooled by water were proposed using a geometric dimensionless number based on numerical simulation. The velocity field, and temperature distribution were obtained to discuss influences of geometric sizes on the fuel performance. Finally, correlations with a geometric dimensionless number were validated with various cases, whose application conditions were also proposed and discussed. This paper provides a guide for study of heat transfer and fluid flow in helical structures, and a reference for establishment of reactor system model using helical cruciform fuels. © 2024, The Authors. All rights reserved.

关键词： Heat transfer coefficients

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Research on Fluctuation Attenuation and Optimization of Passive Residual Heat Removal system Based on Spring Vibrator

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SSRN 2024年

作者： Kang, Zehang Wang, Sipeng Du, Peng Chen, Jin Su, Zhen Zhuang, Kun Department of Nuclear Science and Technology Nanjing University of Aeronautics and Astronautics JiangSu Nanjing211106 China Key Laboratory of Nuclear Technology Application and Radiation Protection in Astronautics Nanjing University of Aeronautics and Astronautics China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China

The potential for flow instability in passive residual heat removal systems (PRHRS) to result in equipment damage underscored the necessity for the development of effective mitigation strategies. In order to reduce the flow instabilities that occurs in the PRHRS, the idea of a fluctuation attenuation scheme based on a spring vibrator structure had been proposed. The structure was based on pressure pulsation attenuator in hydraulic systems and had been optimized. A model of a spring vibrator fluctuation attenuation pipe section was developed and its fluctuation attenuation effect was verified under specific parameters. Such as branch pipe length, cavity cross-sectional area, spring vibrator position, spring vibrator stiffness coefficient, and piston mass. The impact of these factors on fluctuation attenuation was investigated. The results demonstrated that, under identical inlet fluctuation conditions, the fluctuation peak at outlet of the pipe containing spring vibrator structure decreased. The optimization of the above parameters had been demonstrated to enhance the fluctuation removal effect of the spring vibrator structure. This study presented a novel approach to relieve flow instability in PRHRS. © 2024, The Authors. All rights reserved.

关键词： Vibrators

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Coordinated allocation of multi-station fusion substation based on power-gas system

Coordinated allocation of multi-station fusion substation ba...

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2022 International Conference on Electrical, Power and Grid systems, ICEPGS 2022

作者： Ye, Fan Yu, Jianbo Tian, Tian Li, Tao Liu, Chao Tao, Anqi Wang, Qianggang Chongqing Electric Power Design Institute Company of Limited Liability Chongqing404100 China State Key Laboratory of Power Transmission Equipment and System Safety and New Technology Chongqing University Chongqing400044 China

In the context of the large-scale construction of ubiquitous power IOT, an optimal planning model is proposed for multi-station fusion substation that takes coordinated electricity-gas allocation into account. First, the existing traditional substation is upgraded and transformed into a multi-station fusion substation. Then the solution method of the nonlinear optimal model is provided. Finally, an electricity-gas interconnection system is used as an example to test the multi-station fusion substation model. The result shows that the proposed model has certain significance in providing more efficient energy and communication services for the substation. © Published under licence by IOP Publishing Ltd.

关键词： Energy resources

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Effect of Fission Defects on Tensile Strength of U3si2 Σ5(210) Grain Boundary from First-Principles Calculations

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SSRN 2023年

作者： Zhao, Jiajun Sun, Dan Xi, Liu Chen, Ping Zhao, Jijun Wang, Yuanyuan Key Laboratory of Materials Modification by Laser Ion and Electron Beams Ministry of Education Dalian University of Technology Liaoning Dalian China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Sichuan Chengdu China

U3Si2 is regarded as a promising accident tolerant fuel (ATF) to replace the commercial fuel UO2;however, U3Si2 grain boundary (GB) embrittlement caused by irradiation-induced defect segregation remains to be clarified. In this work, U3Si2 Σ5(210) symmetrically tilt GB is taken as representative to elucidate the individual effect of xenon (Xe) and vacancy on the tensile strength and failure of GB using first-principles calculations. Compared with the predicted segregation energies of defects at the most energetically favourable positions of GB, Si vacancy (VSi) has much stronger preference to segregate to GB than that of Xe substitution on Si sublattice (XeSi). Moreover, the strengthening/embrittlement potency of GB with single vacancy/Xe is evaluated using the first-principles-based uniaxial tensile test. Although both VSi and XeSi yield a weakening effect on the strength of U3Si2 Σ5(210) GB, such defective GBs exhibit significantly stronger interface strengths compared to the corresponding defects segregated to UO2 Σ3(111) GB. The underlying mechanism of strength change of U3Si2 GB is discussed in terms of charge analysis. Our results can provide fundamental understanding on the mechanical behavior of irradiated GB from an atomic perspective. © 2023, The Authors. All rights reserved.

关键词： Grain boundaries

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A three-dimensional resilience index evaluation system for the distribution network under flood disaster 2

A three-dimensional resilience index evaluation system for t...

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2nd International Conference on Electronic Materials and Information Engineering, EMIE 2022

作者： Li, Tao Tian, Tian Liu, Chao Zhang, Jun Ye, Fan Tao, Anqi Wang, Qianggang Chongqing Electric Power Design Institute Company of Limited Liability Chongqing404100 China State Key Laboratory of Power Transmission Equipment and System Safety and New Technology Chongqing University Chongqing400044 China

ISBN: (纸本)9781713865629

Frequent flood disasters will lead to large-scale power outages in the distribution networks, and an effective resilience assessment system can help operation and maintenance personnels accurately predict and deal with distribution network failures caused by flood disasters and reduce economic loss. This paper proposes a three-dimensional resilience assessment index system, which consists of 12 individual indexes belong to state, architecture and time aspects. First, the influence of flood disaster on equipment failure rate is quantified and a mathematical model is established to reflect the relationship between rainstorm amount and failure rate. Then the fuzzy analytic hierarchy process (FAHP) and fuzzy membership function are used to comprehensively evaluate the resilience of the distribution network, and identify the weak links in the distribution network’s planning, operation and dispatching. Finally, a case study of Yubei district in Chongqing is carried out to verify the validity and rationality of the proposed resilience evaluation system. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Losses

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Enhanced optical imaging and fluorescent labeling for visualizing drug molecules within living organisms

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Acta Pharmaceutica Sinica B 2024年第6期14卷 2428-2446页

作者： Ting Sun Huanxin Zhao Luyao Hu Xintian Shao Zhiyuan Lu Yuli Wang Peixue Ling Yubo Li Kewu Zeng Qixin Chen School of Pharmaceutical Sciences National Key Laboratory of Advanced Drug Delivery SystemMedical Science and Technology Innovation CenterShandong First Medical University&Shandong Academy of Medical SciencesJinan 250062China Departments of Diagnostic Radiology SurgeryChemical and Biomolecular Engineeringand Biomedical EngineeringYong Loo Lin School of Medicine and College of Design and EngineeringNational University of SingaporeSingapore 119074Singapore Institute of Biochemical and Biotechnological Drugs School of Pharmaceutical SciencesCheeloo College of MedicineShandong UniversityJinan 250012China Key Laboratory of Biopharmaceuticals Postdoctoral Scientific Research WorkstationShandong Academy of Pharmaceutical ScienceJinan 250098China State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical SciencesPeking UniversityBeijing 100191China School of Life Sciences Science and Technology Innovation CenterShandong First Medical University&Shandong Academy of Medical SciencesJinan 250062China School of Chinese Materia Medica Tianjin University of Traditional Chinese MedicineTianjin 301617China Tianjin Pharmaceutical DA REN TANG Group Corporation Limited Traditional Chinese Pharmacy Research Institute Tianjin 300457China Key Laboratory of Systems Bioengineering(Ministry of Education) School of Chemistry Engineering and TechnologyTianjin UniversityTianjin 300072China

The visualization of drugs in living systems has become key techniques in modern *** advancements in optical imaging technologies and molecular design strategies have revolutionized drug *** the subcellular level,super-resolution microscopy has allowed exploration of the molecular landscape within individual cells and the cellular response to *** beyond subcellular imaging,researchers have integrated multiple modes,like optical near-infrared II imaging,to study the complex spatiotemporal interactions between drugs and their *** combining these visualization approaches,researchers gain supplementary information on physiological parameters,metabolic activity,and tissue composition,leading to a comprehensive understanding of drug *** review focuses on cutting-edge technologies in drug visualization,particularly fluorescence imaging,and the main types of fluorescent molecules ***,we discuss current challenges and prospects in targeted drug research,emphasizing the importance of multidisciplinary cooperation in advancing drug *** the integration of advanced imaging technology and molecular design,drug visualization has the potential to redefine our understanding of pharmacology,enabling the analysis of drug micro-dynamics in subcellular environments from new perspectives and deepening pharmacological research to the levels of the cell and organelles.

关键词： Optical imaging Drug visualization Fluorophore labeling Therapeutics

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