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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

Effect of Hydrogen, Helium and Dose Rate on the Evolution of Dislocation Loop in Pure Iron During In-Situ Irradiation

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SSRN 2024年

作者： Wu, Mengjie Huang, Jiyong Cao, Ziqi Ding, Yifan Zhong, Qinghong Zhao, Yanli Ran, Guang College of Energy Xiamen University Xiamen361102 China Fujian Research Center for Nuclear Engineering Xiamen361102 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China

Simulating neutron irradiation with ion irradiation requires considering the comprehensive effects of hydrogen, helium and dose rate to fully understand the microstructure evolution of material in an irradiated environment. Here, the characterization and evolution of dislocation loops in pure iron were investigated under heavy ion irradiation with four different injected gas ion types (Fe+, Fe+ & H2+, Fe+ & He+ and Fe+ & H2+ & He+) and under Fe+ & He+ irradiation with four different dose rates using in-situ transmission electron microscopy at 723 K. Compared to the Fe+ single-beam irradiation, the additional injection of H or He, or co-injecting H & He, mainly promoted the nucleation of dislocation loops at the early stage of irradiation and enhanced loop growth after that. Among them, the simultaneous irradiation of Fe+ & H2+& He+ triple beams were most pronounced. Moreover, Fe+ & H2+ & He+ triple-beam irradiation resulted in the highest fraction of loops and the highest ratio of the rotation of loop habit-plane. Under Fe+ & He+ dual-beam irradiation, the results demonstrated that as the dose rate increases, the loop density increased and the loop size decreased. Moreover, the fraction of loops at low dose rate was noticeably greater than that at high dose rate. The results of the current work provide important references for a better understanding of the effectiveness of ion irradiation in simulating neutron irradiation. © 2024, The Authors. All rights reserved.

关键词： Neutron irradiation

MDDA: A Multi-scene Recognition Model with Multi-dimensional Domain Adaptation 4

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MDDA: A Multi-scene Recognition Model with Multi-dimensional...

4th IEEE International Conference on Electronics technology, ICET 2021

作者： Wan, Naijia Zhang, Changhua Chen, Qian Li, Hao Liu, Xiaobo Wei, Xuedong University of Electronic Science and Technology of China School of Information and Software Engineering Chengdu China University of Electronic Science and Technology of China School of Mechanical and Electrical Engineering Chengdu China Science and Technology on Reactor System Design Technology Laboratory Chengdu China

ISBN: (纸本)9781728176734

Optical Character Recognition is widely used in scenarios from license plate recognition, chip detection to text translation. However, in some special scenarios, there are very few data for training or the target datasets are not marked. This paper mainly aims to establish a multi-scene text recognition model that can achieve accurate results even when the target test dataset is not marked. The model reduces the distance between domains at the feature level by using an adversarial loss and flipping the gradient. For the adversarial loss, each letter has a different domain discriminator to align the features at the character level. We also align the source domain features and target domain features in the background. Experimental results show that our model achieves good performance when the training dataset and test dataset have domain shift, and suggest possible scenarios for potential applications. © 2021 IEEE.

关键词： Optical character recognition

Characterization of the Oxide Film and Deuterium Permeation Behavior of Cocrmnfeni High Entropy Alloy Oxidized at 550 °C for 24 Hours

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SSRN 2023年

作者： Yin, Chunyu Li, Wenxuan Qiu, Xi Luo, Bin Huang, Hongtao Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China Sino-French Institute of Nuclear Energy and Technology Sun Yat-Sen University Zhuhai519082 China

High entropy alloys have become potential candidate materials for high temperature nuclear reactor due to its high strength, high hardness, excellent corrosion resistance and radiation resistance, therefore the compatibility of hydrogen isotopes with HEAs becomes a key issue that has attracted a lot of attentions. The deuterium permeation behavior of the CoCrMnFeNi high entropy alloy after oxidation at 550 °C for 24 h was investigated by gas-phase deuterium permeation testing, SEM, X-ray diffraction methods in this paper. The results show that a dense oxide film with a thickness of about 1μm was formed on the surface of the sample after oxidation. The outer layer of the oxide film is rich in Mn2O3 and the inner layer is rich in Cr2O3. The deuterium permeability of the CoCrMnFeNi sample after oxidation was reduced by an order of magnitude and was 1/7-1/17 times as high as that for the unoxidized one. © 2023, The Authors. All rights reserved.

关键词： Entropy

Experimental study on the sub-channel void fraction characteristics of bubbly flow in rod bundles

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Experimental study on the sub-channel void fraction characte...

2020 International Conference on Nuclear Engineering, ICONE 2020, collocated with the ASME 2020 Power Conference

作者： Ren, Quan-Yao Pu, Zeng-Ping Zheng, Mei-Yin Su, Min Chen, Ping Pan, Liang-Ming He, Hui He, Qing-Che Science and Technology on Reactor System Design Technology Laboratory Chengdu China Chongqing China

ISBN: (纸本)9780791883785

The gas-liquid two-phase flow behaviors are always associated with its dynamic void fraction, such as flow resistance, heat transfer coefficient, phase distribution, critical heat flux etc. As regard to the commercial PWR and BWR, rod bundles are the typical geometry, which contains many subchannels for coolant flowing. In present study, the sub-channel void fraction was measured in 5×5 rod bundles with the subchannel impedance void meter consisting of 12 strip electrodes. Based on the measured void fraction in different sub-channels, the void fraction dynamics, PDF (probability distribution function) and CDF (cumulative distribution function) curves were analyzed to make clear the effect of superficial gas and liquid velocity, flow development and casing tube. The empirical correlation for PDF of dynamic sub-channel void fraction has been developed, which showed good fitness with PDF and CDF curves and satisfying accuracy of averaged void fraction. © 2020 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： Void fraction

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

Theoretical research on two-phase flow instability in parallel rectangular channels under periodic perturbation

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Theoretical research on two-phase flow instability in parall...

2020 International Conference on Nuclear Engineering, ICONE 2020, collocated with the ASME 2020 Power Conference

作者： Qian, Libo Deng, Jian Huang, Tao Cai, Rong Science and Technology on Reactor System Design Technology Laboratory Npic Chengdu Sichuan China

ISBN: (纸本)9780791883785

A theoretical model for Density Wave Oscillations (DWOs) flow instability in parallel rectangular channels under periodic heaving motion is established with a lumped mathematical model based on homogenous hypothesis. The parallel rectangular channels comprise of the entrance section, the heating section, the riser section and the upper- and lower plenums, which guarantee the isobaric pressure drop condition between channels and the model consists of boiling channel model, pressure drop model, parallel channel model, additional pressure drop model generated by heaving motions, the constitutive and numerical models. The effect of periodic perturbation is introduced through additional pressure drop in the momentum equation. The model is validated with experimental data of a twin-rectangular-channel flow instability experiment under static condition. Then the flow instability in parallel-rectangular-channel system is studied under periodic perturbation and the margin of flow instability and the threshold power of the system under static condition is calculated as basis condition for comparison. The effect of the amplitude and period of perturbation is analyzed analytically and the results show that the amplitude and period of perturbation shows little effect on flow instability. While when the additional pressure difference introduced by heaving motion is comparable with that under static condition, the effect of amplitude becomes stronger. And the period of perturbation strongly effects the threshold power when it is identical to that of natural period of the system, which can be explained by resonance between the perturbation and the system. And this effect is even stronger when the asymmetric heating condition is introduced. © 2020 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： Pressure drop

Identification Algorithm Framework and Structural model on Input Pattern of Metamorphic Relations 9

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Identification Algorithm Framework and Structural model on I...

9th International Conference on Dependable systems and Their Applications, DSA 2022

作者： Yan, Shiyu Yang, Xiaohua Lu, Zhongjian Li, Meng Gong, Helin Liu, Jie Computer School University of South China Hunan Hengyang China Intelligent Equipment Software Evaluation Engineering Technology Research Center of Hunan Hengyang China Cnnc Key Laboratory on High Trusted Computing Hunan Hengyang China Nuclear Power Institute of China Science and Technology on Reactor System Design Technology Laboratory Chengdu China

ISBN: (数字)9781665488778

ISBN: (纸本)9781665488778

Metamorphic Relation (MR) plays a crucial role in Metamorphic Testing (MT), which can be regarded as the implication relation from the input pattern to the output pattern. Based on MR's properties, the identification of Metamorphic Relations (MRs) can be from its input pattern and output pattern, respectively. However, the finding of the effective input pattern is very first and important. Especially for complicated mathematical function includes more than two input variables, we systematically analyze the structural model of input pattern in MR, propose the concept of the class of basic input pattern, as well as prove that any one input pattern can be expressed as a combination of basic input patterns in scientific computing programs. Moreover, the structural model of input pattern in MR is established based on previous proof. Finally, we put forward an identification algorithm framework and analysis its complexity. The core contribution of our method is to decompose the input pattern identification problem in multi-dimensional space into a single one-dimensional. For this reason, the examples show that the complexity of the algorithm is reduced significantly. © 2022 IEEE.

关键词： Computational complexity

Assessment of Coupled Effect of Steam Pipes on Seismic Analysis of reactor Coolant system

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Assessment of Coupled Effect of Steam Pipes on Seismic Analy...

作者： Lijuan Li Zhenyu Liu Hui Li Xianhui Ye Honglei Ai National Key Laboratory of Science and Technology on Reactor System Design Technology

reactor coolant system is connected with auxiliary pipes, surge pipes and steam pipes. In order to facilitate the dynamic analysis of reactor coolant system, it is necessary to decouple the pipes connected with the reactor coolant system. Although some international standards stipulating requirements for the decoupling of subsystems from the main system, in order to further explore the influence of decoupling steam pipes, the seismic response of reactor coolant system with or without steam pipes is simulated by using ANSYS program. Firstly, the modal analysis of reactor coolant system is carried out to analysis the influence of steam pipes on the resonant frequency of reactor system. Then, the standardized seismic dynamic analysis of reactor system with or without steam pipes is carried out. The nozzle load(inlet and outlet nozzle load of main device, such as reactor pressure vessel, steam generator, pump) and support load(of main device such as reactor pressure vessel, steam generator, pump) are output and compared. According to nozzle load and support load, it can be seen that the steam pipes have little influence on the seismic analysis of reactor coolant system, i.e. steam pipes can be decoupled in the seismic analysis of reactor coolant system.

关键词： reactor coolant system dynamic analysis seismic response decouple steam pipes