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Research on Fine Modeling of Dispersion Fuel Plate Based on Lattice Method

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SSRN 2023年

作者： Chen, Yuqing Liu, Pengfei Li, Song Lou, Lei Li, Ang College of Nuclear Science and Technology Naval University of Engineering Wuhan China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

For Double Heterogeneous(DH) systems, the analysis shows that the lattice modeling method has a great advantage in efficiency compared to the stochastic explicit modeling method, but the Lattice Modeling Method with Single-Particle Universe(LMMSU) has difficulties in calculating the problem of DH system with multiple particle sizes. In this paper, a Lattice Modeling Method with Multiple -Particles Universe(LMMMU) is proposed . The LMMMU has a computational error of less than 30 pcm when dealing with particle-dispersed fuel systems and still less than 50 pcm when dealing with particle-dispersed burnable poison systems. The memory footprint is reduced to 5.21% and the computation time is reduced to 1.25% compared to the stochastic explicit modeling method. The LMMMU also shows good compatibility when dealing with the problem of filling by two types of dispersed particles. Comprehensive analysis shows that the LMMMU is better than LMMSU in terms of applicability, efficiency, and accuracy. © 2023, The Authors. All rights reserved.

关键词： Efficiency

High-Performance in N-Type Pbte Thermoelectric Materials by Defects Management and Extraordinary Role of Cd Alloying

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SSRN 2024年

作者： Chen, Zhiyu Li, Mancang Chen, Zhang Wang, Yu Zhou, Daijie Huang, Xueliang Zhang, Xinhu Guo, Rui Liu, Xianbo Wang, Zhengshang Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China Sichuan Research Center of New Materials Chengdu610000 China

The conventional multiple isovalent alloying is proved to be effective for enhancing n-type PbTe thermoelectrics. However, the introduction of various elements undeniably leads to potential stability concerns during material application. Here, we propose a straightforward strategy that leverages Cd alloying and defect management to enhance the TE performance of n-type PbTe. The Cd doping facilitates band gap widening, resulting in increased effective mass and Seebeck coefficient, especially at elevated temperatures due to the improved Cd solubility. Furthermore, the introduction of excess Pb atoms serves to occupy intrinsic Pb vacancies, consequently enhancing carrier mobility. As a result, the maximum power factor of Cd-alloyed Pb1.01Te samples reaches 31.5 μW cm-1 K-2, signifying a remarkable improvement of 69.3% in comparison to pristine PbTe. Additionally, the enlarged band gap induced by Cd alloying also effectively mitigates bipolar diffusion, combining with the enhanced phonon scattering due to CdTe secondary phase, yields a 34.3% decrease in thermal conductivity. By harnessing the multifaceted effects of Cd alloying and defect management, the ZT value of Pb1.01Te-2%Cd samples reaches 1.35 at 782 K. The present findings provide a novel perspective on the versatile utilization of single isovalent element alloying and the optimization of performance across other TE materials. © 2024, The Authors. All rights reserved.

关键词： Energy gap

design of Shocks & Vibrations Monitoring System for Long Distance Transportation in Confined Spaces

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Design of Shocks & Vibrations Monitoring System for Long Dis...

2023 China Automation Congress, CAC 2023

作者： Huang, Shiyong Geng, Yuru Han, Yong Gu, Mingfei Nuclear Power Institute of China Chengdu China Nuclear Haichuan Nuclear Technology Co. Ltd Chengdu China School of Network and Communication Engineering Chengdu Technological University Chengdu China Chengdu Vocational & Technical College of Industry Chengdu China Nuclear Power Institute of China Science and Technology on Reactor System Design Technology Laboratory Chengdu China

ISBN: (纸本)9798350303759

In real life, many valuable products and highvalue important products are transported in long distances. Shocks and vibrations are caused during transportation, loading and unloading for various reasons. Any shock and vibration exceeding the regulations may cause damage to the transported products. So, it is necessary to monitor and analyze these data of shocks and vibrations scientifically, while considering that some transportation conditions have special requirements for installation space and transportation time. Therefore, an ultra-thin and long-lasting monitoring system has been developed based on MEMS accelerometer technology to measure shocks and vibrations. After series of independent tests and calibration tests conducted by a third party on the product, the results show that it can record and store the threeaxis acceleration, temperature, humidity, pressure, time and other parameters of the transportation process in real time, and complete the preliminary assessment of the transportation status of high-value products. Then engineers can conduct professional analysis of the data to obtain scientific transportation monitoring reports, and provide scientific basis for taking safety prevention and treatment measures for subsequent transportation. © 2023 IEEE.

关键词： Vibration analysis

A Power Regulation Strategy for Heat Pipe Cooled reactors Based on Deep Learning and Hybrid Data-Driven Optimization Algorithm

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SSRN 2023年

作者： Huang, Mengqi Peng, Changhong Du, Zhengyu Liu, Yu School of Nuclear Science and Technology University of Science and Technology of China Anhui Hefei230027 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Sichuan Chengdu610213 China

Heat pipe cooled reactors are suitable for deployment in remote or isolated areas as reliable small-scale power sources due to their good design characteristics. In order to cope with the real-time changing power demand in a dynamic environment, this study proposes a decision-making strategy for power regulation of heat pipe cooled reactors based on deep learning and hybrid data-driven optimization algorithm, which helps to achieve autonomous safe and efficient control of heat pipe cooled reactors under specific power demand. Firstly, an artificial neural network-based power prediction model for heat pipe cooled reactors is constructed;secondly, an evaluation criterion of power regulation schemes that integrates reactor safety and operational effectiveness is established based on utility theory, and finally, a hybrid data-driven optimization algorithm is proposed, which can quickly discover the power regulation scheme with the best utility under specific power demand. The strategy's effectiveness is verified by taking the power regulation process of the MegaPower heat pipe cooled reactor as an example. The results show that the strategy can make stable, accurate and near-optimal power regulation scheme decisions for arbitrary power demand within 20 seconds. © 2023, The Authors. All rights reserved.

关键词： Decision making

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 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

Study on hydrogen stratification and erosion process in Chinese SMR containment under severe accident scenario

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International Journal of Advanced Nuclear reactor design and technology 2020年 2卷 43-51页

作者： Fan, Yang Songwei, Li Wei, Zeng Zhifang, Qiu Jian, Deng Science and Technology on Reactor System Design Technology Laboratory NPIC China Design and Research Sub-institute NPIC China

During postulated severe accident, large amount of hydrogen-vapor mixture will be released into the containment and inflammable gas mixture may form. Once the gas will be ignited, the generated pressure loads can jeopardize the integrity of the internal structures. As the local accumulation of high content hydrogen related much to the stratification and erosion mechanism, it is therefore of interest whether a stratification of gas layers will form within small containment. In this study, a stratification/erosion experiment is performed and the criteria under which the steady stratification will be destroyed by steam jet discussed. Then the simulation method is validated by the experimental data. At last, several severe accident scenarios for Chinese SMR performed and one of them is adopted for containment hydrogen CFD analysis. It is shown that high content of hydrogen will form in the upper part of the containment, and clear gas stratification will form, such stratification will be enhanced due to the condensation effect of steel containment wall. © 2020

关键词： Hydrogen

Optimized Moderator design and Analysis of a Pin-Type Supercritical Carbon Dioxide reactor Based on RMC 29

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Optimized Moderator Design and Analysis of a Pin-Type Superc...

2022 29th International Conference on Nuclear Engineering, ICONE 2022

作者： Zhao, Xingyu Liu, Minyun Cui, Rongyi Huang, Shanfang Wang, Kan Lu, Chuan Department of Engineering Physics Tsinghua University Beijing China Cnnc Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology Nuclear Power Institute of China Chengdu China China Nuclear Power Engineering Co. Ltd Beijing China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

ISBN: (纸本)9780791886502

This study analyzed an yttrium hydride (YH2) moderated supercritical carbon dioxide cooled reactor loaded with pin-type, beryllium oxide diluted oxide fuel elements to reduce the critical enrichment. The impact of the YH2 on the coolant void reactivity was studied along with a moderator zoning scheme to flatten the radial power distribution. The YH2 was added as hexagonal moderating rods at the center of the fuel assemblies. The core was modeled using the continuous-energy reactor Monte Carlo code, RMC, with the On-The-Fly cross sections treatment. The results showed that the YH2 moderator increased the thermal fission and reduced the critical enrichment of the core with the same diluent volume fraction by more than 30%. The YH2 moderator significantly softened the neutron energy spectrum and reduced the neutron leakage upon core voiding, resulting in both a weaker positive spectral reactivity feedback and a weaker negative leakage reactivity feedback during core depressurization. For an UO2-loaded core, the YH2 gave a lower negative coolant void reactivity, while for a MOX-loaded core with diluent volume fractions smaller than 35%, the spectral feedback was more important and the YH2 strongly reduced the positive coolant void reactivity to less than $1. Arranging the YH2 in the peripheral assemblies reduced the radial power peaking factor to 1.319. The study shows that the YH2 moderator can reduce the critical enrichment, make the core less sensitive to voiding, and can flatten the radial power distribution of a single-enrichment core through moderator zoning. © 2022 by ASME.

关键词： Carbon dioxide

Simulation and Calculation of Proximity Effect of Coils under Fast Transients 13

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Simulation and Calculation of Proximity Effect of Coils unde...

13th Asia-Pacific International Symposium on Electromagnetic Compatibility and Technical Exhibition, APEMC 2022

作者： Wang, Zongyang Song, Wenchang Xie, Yanzhao He, Xianjian Xi'An Jiaotong University State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical Engineering Xi'an China Nuclear Power Institute of China Science and Technology on Reactor System Design Technology Laboratory Chengdu China

ISBN: (数字)9781665416719

ISBN: (纸本)9781665416719

Proximity effect over a broad frequency range plays an important role in analyzing transients in the coils. The frequency dependent characteristic makes proximity effect a tricky problem. This paper first introduces FEM simulation to calculate the complex impedance of proximity effect and compares different axial arrangement of two conductors, shows a good agreement. In addition, different formulas are used to compare their results with FEM simulation to verify their accuracy. Kane formula and Modified formula can both get relatively accurate results. Considering the accuracy and conciseness of Modified formula, it is preferred in the analysis of transients in coils. © 2022 IEEE.

关键词： Finite element method

Controlling antifungal activity with light:Optical regulation of fungal ergosterol biosynthetic pathway with photo-responsive CYP51 inhibitors

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Acta Pharmaceutica Sinica B 2023年第7期13卷 3080-3092页

作者： Zhuang Li Na Liu Wanzhen Yang Jie Tu Yahui Huang Wei Wang Chunquan Sheng State Key Laboratory of Bioengineering Reactor And Shanghai Key Laboratory of New Drug DesignSchool of PharmacyEast China University of Science&TechnologyShanghai 200237China School of Pharmacy Second Military Medical University(Naval Medical University)Shanghai 200433China Department of Pharmacology and Toxicology College of PharmacyAnd BIO5 InstituteUniversity of ArizonaTucsonAZ 85721USA

Invasive fungal infections(IFIs)have been associated with high mortality,highlighting the urgent need for developing novel antifungal *** the first light-responsive antifungal agents were designed by optical control of fungal ergosterol biosynthesis pathway with photocaged triazole lanosterol 14a-demethylase(CYP51)*** photocaged triazoles completely shielded the *** content of ergosterol in fungi before photoactivation and after photoactivation was 4.4%and 83.7%,***,the shielded antifungal activity(MIC80≥64μg/m L)could be efficiently recovered(MIC80=0.5—8μg/m L)by light *** new chemical tools enable optical control of fungal growth arrest,morphological conversion and biofilm *** ability for highprecision antifungal treatment was validated by in vivo *** light-activated compound A1 was comparable to fluconazole in prolonging survival in Galleria mellonella larvae with a median survival of 14 days and reducing fungal burden in the mouse skin infection ***,this study paves the way for precise regulation of antifungal therapy with improved efficacy and safety.

关键词： Antifungal agents Ergosterol biosynthesis Triazoles Photocaged Optical control