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作者： Wang, Lianjie Yang, Ping Lu, Di Zhao, Wenbo Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China No. 328 Section 1 Changshun Avenue Shuangliu County Chengdu610213 China

An optimization design of China supercritical water-cooled reactor (SCWR) with the rated electric power of 1000 MWe (CSR1000) conceptual core is proposed. Steady-state performance of the proposed core is then studied with the SCWR core steady-state analysis code system SNTA. These key parameters such as burnup performance, reactivity control capability, power distribution, maximum fuel cladding temperature, and maximum linear power density are analyzed. The relative coolant flow rate of the second flow path, which is suited with assembly power, is also presented. The study shows that the refueling cycle of CSR1000 core can be extended effectively under the optimization design. Copyright © 2018 by ASME.

关键词： Water cooled reactors

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RMC/CTF multiphysics solutions to VERA benchmark problem 9

RMC/CTF multiphysics solutions to VERA benchmark problem 9

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2018 Transactions of the American Nuclear Society, ANS 2018

作者： Ma, Yugao Liu, Shichang Luo, Zhen Wang, Kan Yu, Ganglin Huang, Shanfang Department of Engineering Physics Tsinghua University Beijing100084 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China

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Methods and Verification of 3D direct reactor calculation code KYCORE

Methods and Verification of 3D direct reactor calculation co...

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2018 International Conference on Physics of reactors: reactor Physics Paving the Way Towards More Efficient systems, PHYSOR 2018

作者： Tang, Xiao Li, Qing Chai, Xiaoming Tu, Xiaolan Peng, Xingjie Wang, Kan Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China Department of Engineering Physics Tsinghua University Beijing 100084 China

ISBN: (纸本)9781713808510

KYCORE is a 3D direct reactor calculation code capable of performing reactor hetero geneous calculation without cross section homogenization and group condense. It is developed in Nuclear Power Institute of China, involving radial characteristics method (MOC) and axial discrete ordinate method (SN) coupled 3D neutron transport and subgroup method with fixed source problem for resonance treatment and depletion, aiming at providing mini core design and commercial reactor benchmark solution. This article briefly introduces optimized MOC/SN coupling, adjusted coarse mesh finite difference (CMFD) and resonance treatment. The accuracy of the code is verified with 3D VERA Problem 3 benchmark and proves to be credible. © 2018 International Conference on Physics of reactors, PHYSOR 2018: reactor Physics Paving the Way Towards More Efficient systems. All rights reserved.

关键词： Codes (symbols)

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Development of a sensitivity analysis code for 3-D C5G7 benchmarks based on the pertubation theary

Development of a sensitivity analysis code for 3-D C5G7 benc...

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2018 International Conference on Physics of reactors: reactor Physics Paving the Way Towards More Efficient systems, PHYSOR 2018

作者： Wu, Qu Peng, Xingjie Yu, Yingrui Li, Qing Wang, Kan Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China Department of Engineering Physics Tsinghua University Beijing100084 China

ISBN: (纸本)9781713808510

Sensitivity and Uncertainty (S&U) analysis plays a major role in reactor physics. Uncertainty in reactor engineering comes from model error, numerical error and input parameter error. Nuclear data are regarded as crucial input parameters and proven to be a major uncertainty source. Therefore, effective evaluation of nuclear data can promote the accuracy and fidelity of nuclear system simulation. In deterministic codes, however, most studies about S&U analysis are based on the traditional two-step method, i.e. assembly calculation and core simulation. With the development of advanced 2-D/l-D transport codes, the corresponding S&U analysis model is required. A new S&U analysis code, namely KYADJ, achieved the sensitivity analysis of eigenvalue with respect to material macroscopic cross sections based on classical perturbation theory. Forward and adjoint flux were solved by the coupling of 2-D Method of Characteristics (MOC) and 1-D discrete ordinates method (Sn). Besides, the Direct Numerical Perturbation (DNP) method in KYADJ and the Iterated Fission Probability (UP) method in reactor Monte Carlo code (RMC) were adopted to calculate sensitivity coefficients for comparison. A 3x3 pin-cell benchmark and 3-D OECD/NEA C5G7 benchmarks were applied to verify the ability of sensitivity analysis in KYADJ. Results showed that a good agreement among three approaches was achieved. KYADJ can accurately calculate eigenvalue sensitivity coefficients with respect to input nuclear data. © 2018 International Conference on Physics of reactors, PHYSOR 2018: reactor Physics Paving the Way Towards More Efficient systems. All rights reserved.

关键词： Sensitivity analysis

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Numerical simulation research on the performance of SCWR fuel rod

Numerical simulation research on the performance of SCWR fue...

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作者： Tang, Changbing Xing, Shuo Pang, Hua Chen, Ping Zhou, Yi Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China No. 328 First Section of Changshun Avenue Shuangliu District Sichuan610041 China

Because of the high temperature and high pressure characteristics of supercritical water-cooled reactor (SCWR), the thermal hydraulic performance of SCWR is greatly different from pressurized water reactor (PWR), which makes the current PWR fuel rod performance analysis codes are no longer applicable to SCWR. In this research, the irradiation swelling, irradiation densification, thermal expansion, thermal creep, plastic deformation, irradiation creep and irradiation hardening of UO2 pellet, and stainless steel cladding were considered;the gas conductance and radiant conductance of gap heat transfer were considered, the forced convective heat transfer on the outer surface of cladding was considered. Meanwhile, the irradiation effects and the thermal effects on the materials parameters such as thermal conductivity, specific heat, and young’s modulus were also considered in this research. With the help of ABAQUS software, the related user-defined subroutines were developed, and the irradiation effects and thermal effects of SCWR fuel were introduced into the numerical simulation, and then completed the analysis of SCWR fuel rods’ performance under steady power conditions. Some reference suggestions for the design and development of SCWR fuel could be provided by the establishment of this numerical simulation method. Copyright © 2018 by ASME.

关键词： Pressurized water reactors

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Calculation of adjoint-weighted reactor kinetics parameters in OpenMC

Calculation of adjoint-weighted reactor kinetics parameters ...

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2018 International Conference on Physics of reactors: reactor Physics Paving the Way Towards More Efficient systems, PHYSOR 2018

作者： Peng, Xingjie Forget, Benoit Smith, Kord Science and Technology on Reactor System Design Technology Laboratory ChengduSichuan610000 China Nuclear Science and Engineering Department Massachusetts Institute of Technology 77 Massachusetts Ave. CambridgeMA02139 United States

ISBN: (纸本)9781713808510

Knowledge of adjoint-weighted kinetics parameters plays an importance role in analyzing the reactor safety and in describing the transient behavior of nuclear reactors during normal operation or accidents. In this work, the capability of calculating adjoint-weighted kinetic parameters, including the effective neutron generation time, the effective delayed neutron fraction, and the ratio of these two quantities was implemented in OpenMC code based on two different methods of interpreting the physical meaning of the adjoint weighting, namely, the iterated fission probability (IFP) method and the Contribution-Linked eigenvalue sensitivity/Uncertainty estimation via Tracklength importance CHaracterization (CLUTCH) method. The results of the implementation were benchmarked by comparison to MCNP5 calculations, Serpent2 calculations and experimental data in 10 critical configurations. © 2018 International Conference on Physics of reactors, PHYSOR 2018: reactor Physics Paving the Way Towards More Efficient systems. All rights reserved.

关键词： Eigenvalues and eigenfunctions

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Lattice Boltzmann method for simulation of time-dependent neutral particle transport

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Nuclear science and Techniques 2017年第3期28卷 74-84页

作者： Ya-Hui Wang Li-Ming Yan Bang-Yang Xia Yu Ma School of Energy Science and Engineering Harbin Institute of Technology Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China

In this paper, a novel model is proposed to investigate the neutron transport in scattering and absorbing medium. This solution to the linear Boltzmann equation is expanded from the idea of lattice Boltzmann method(LBM) with the collision and streaming process. The theoretical derivation of lattice Boltzmann model for transient neutron transport problem is proposed for the first *** fully implicit backward difference scheme is used to ensure the numerical stability, and relaxation time and equilibrium particle distribution function are obtained. To validate the new lattice Boltzmann model, the LBM formulation is tested for a homogenous media with different sources, and both transient and steady-state LBM results get a good agreement with the benchmark solutions.

关键词： Transient neutron transport Lattice Boltzmann method Linear Boltzmann equation

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Optimal interface surface determination for multi-axis freeform surface machining with both roughing and finishing

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Chinese Journal of Aeronautics 2018年第2期31卷 370-384页

作者： Lufeng CHEN Pengcheng HU Ming LUO Kai TANG Hong Kong University of Science and Technology Hong Kong China National Numerical Control System Engineering Research Center Huazhong University of Science and Technology Wuhan 430074 China Key Laboratory of Contemporary Design and Integrated Manufacturing Technology Ministory of EducationNorthwestern Polytechnical University Xi'an 710072 China

In the current practice of multi-axis machining of freeform surfaces, the interface surface between the roughing and finishing process is simply an offset surface of the nominal surface. While there have already been attempts at minimizing the machining time by considering the kinematic capacities of the machine tool and/or the physical constraints such as the cutting force, they all target independently at either the finishing or the roughing process alone and are based on the simple premise of an offset interface surface. Conceivably, since the total machining time should count that of both roughing and finishing process and both of them crucially depend on the interface surface, it is natural to ask if, under the same kinematic capacities and the same physical constraints, there is a nontrivial interface surface whose corresponding total machining time will be the minimum among all the possible（infinite） choices of interface surfaces, and this is the motivation behind the work of this paper. Specifically, with respect to the specific type of iso-planar milling for both roughing and finishing, we present a practical algorithm for determining such an optimal interface surface for an arbitrary freeform surface. While the algorithm is proposed for iso-planar milling, it can be easily adapted to other types of milling strategy such as contour milling. Both computer simulation and physical cutting experiments of the proposed method have convincingly demonstrated its advantages over the traditional simple offset method.

关键词： Feed rate Finishing and roughing process Interface surface lso-planar tool path Physical constraints

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A novel Skin lesion prediction and classification technique: ViT-GradCAM

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Skin research and technology : official journal of International Society for Bioengineering and the Skin (ISBS) [and] International Society for Digital Imaging of Skin (ISDIS) [and] International Society for Skin Imaging (ISSI) 2024年第9期30卷 e70040页

作者： Muhammad Shafiq Kapil Aggarwal Jagannathan Jayachandran Gayathri Srinivasan Rajasekhar Boddu Adugna Alemayehu School of Information Engineering Qujing Normal University Qujing China. Key Laboratory of Intelligent Sensor and System Design College of Information Engineering Qujing Normal University Qujing China. Department of CSE Koneru Lakshmaiah Education Foundation Vaddeswaram Andhra Pradesh India. Department of Software and Systems Engineering School of Computer Science Engineering and Information Systems Vellore Institute of Technology Katpadi Vellore India. Department of Computer Science and Engineering Sathyabama Institute of Science and Technology Chennai India. Department of AIML Gokaraju Rangaraju Institute of Engineering and Technology Bachupally Hyderabad India. Lecturer in Software Engineering Wachemo University Hosaina Ethiopia.

BACKGROUND:Skin cancer is one of the highly occurring diseases in human life. Early detection and treatment are the prime and necessary points to reduce the malignancy of infections. Deep learning techniques are supplementary tools to assist clinical experts in detecting and localizing skin lesions. Vision transformers (ViT) based on image segmentation classification using multiple classes provide fairly accurate detection and are gaining more popularity due to legitimate multiclass prediction capabilities. MATERIALS AND METHODS:In this research, we propose a new ViT Gradient-Weighted Class Activation Mapping (GradCAM) based architecture named ViT-GradCAM for detecting and classifying skin lesions by spreading ratio on the lesion's surface area. The proposed system is trained and validated using a HAM 10000 dataset by studying seven skin lesions. The database comprises 10 015 dermatoscopic images of varied sizes. The data preprocessing and data augmentation techniques are applied to overcome the class imbalance issues and improve the model's performance. RESULT:The proposed algorithm is based on ViT models that classify the dermatoscopic images into seven classes with an accuracy of 97.28%, precision of 98.51, recall of 95.2%, and an F1 score of 94.6, respectively. The proposed ViT-GradCAM obtains better and more accurate detection and classification than other state-of-the-art deep learning-based skin lesion detection models. The architecture of ViT-GradCAM is extensively visualized to highlight the actual pixels in essential regions associated with skin-specific pathologies. CONCLUSION:This research proposes an alternate solution to overcome the challenges of detecting and classifying skin lesions using ViTs and GradCAM, which play a significant role in detecting and classifying skin lesions accurately rather than relying solely on deep learning models.

关键词： Grad‐CAM Multi‐Headed Self attention (MSA) linear patch projection multilayer perceptron (MLP) skin lesion transformer encoder vision transformer (ViT)

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A computer code for thermal-hydraulic analysis of steam generator with axial preheater/economizer

A computer code for thermal-hydraulic analysis of steam gene...

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AISTech 2018 Iron and Steel technology Conference and Exposition

作者： Wu, Ge He, Gening Wang, Haisong Nuclear Power Institute of China Science and Technology on Reactor System Design Technology Laboratory NO.328 First Sec. of Changshun Ave. Shuangliu District Chengdu China

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