Advance Search
Development of a Neutronics-Thermal-Mechanical Coupling Model for Small Gas-Cooled Fast Reactors
 doi: 10.13832/j.jnpe.2025.05.0205
Abstract(62) PDF(3)
Abstract:
The Gas-cooled Fast Reactor (GFR), a fourth-generation nuclear system, faces multi-physics coupling challenges due to its high-enrichment core and gas-cooling features. This study develops an RMC-ANSYS-coupled methodology for pin-type GFRs, focusing on a 2 MW modular core. The workflow integrates Monte Carlo-based neutronics (RMC) and thermal-mechanical analysis (ANSYS), enhanced by dynamic geometry mapping to address gas coolant convection and non-uniform expansion. Key geometric deformations, including fuel rod ellipticity and grid eccentricity, were simplified with relaxation-optimized convergence. Results show convergence within two iterations (keff σ=0.00016), revealing core deformation feedback (-623 pcm) as the dominant reactivity mechanism (25× Doppler effect). Deformation-induced fuel displacement toward radial reflectors elevated local power/temperature, validating methodology conservatism. Sensitivity analysis of a 7-assembly "Soccer Reactor" demonstrates anisotropic behavior: 10% radial grid plate expansion reduced keff by 7, 662 pcm (sensitivity -0.73), while axial fuel expansion caused 3, 564 pcm loss (-0.34). Reflectors showed 3× higher axial than radial sensitivity. Grid plate deformation emerged as the critical reactivity driver, establishing foundational insights for deformation compensation and Gen IV GFR safety design. This approach advances traditional density-equivalence methods through explicit geometric distortion modeling.
Research on Intelligent Difference Analysis Method for Nuclear Power I&C Drawings Integrating Image Semantics
 doi: 10.13832/j.jnpe.2025.06.0274
Abstract(58) PDF(2)
Abstract:
Aiming at the problem of lacking accurate and efficient difference analysis methods for different versions of instrumentation and control (I&C) drawings in the iterative design process of nuclear power I&C systems, this paper proposes an intelligent difference analysis method for nuclear power I&C drawings integrating image semantics. This method employs the Hash algorithm to rapidly analyze identical images, uses image segmentation algorithms to focus on effective content, and combines pixel comparison with semantic understanding to accurately identify real differences, achieving fast and highly accurate intelligent analysis of drawing differences. The results of case studies show that this method achieves a precision of 89.7% and a recall of 98.6% on the validation dataset, with an analysis speed of 16.89 FPS (Frames Per Second), striking a good balance between recall and precision indicators. This method provides a new idea for difference analysis of I&C drawings. Carrying out difference analysis of I&C drawings in a human-computer collaboration manner can meet engineering application requirements, and its analysis efficiency is significantly better than manual analysis, demonstrating remarkable engineering application value.
Research on an Equivalent Stiffness Calculation Model for Spring Plates Based on Large Deformation Beam Theory
 doi: 10.13832/j.jnpe.2025.07.0345
Abstract(61) PDF(2)
Abstract:
In pressurized water reactor fuel assemblies, fuel rods are secured by grid supports, with grid springs providing crucial preload clamping force. Clamping relaxation can reduce the overall structural stiffness of the assembly, intensify fretting wear between fuel rod cladding and grids, and compromise nuclear reactor safety. Therefore, accurately characterizing the mechanical properties of spring strips is essential for assembly design. This paper presents a pre-deformed insertable spring strip design and establishes an equivalent stiffness calculation model based on post-buckling beam theory. First, the nonlinear governing equations for large deformations were derived under large-deflection assumptions. Then, a double nested Newton shooting method yielded semi-analytical solutions for the system's governing equations, with experimental validation confirming theoretical reliability. Finally, the influence of design parameters on spring preload was investigated, revealing the dependence between spring design parameters and stiffness. This research elucidates the relationship between grid spring dimensions and preload, providing theoretical support for spring design and optimization.
Separation of Radionuclides from Boric Acid Containing Waste Liquid in Nuclear Power Plants Based on Reverse Osmosis
 doi: 10.13832/j.jnpe.2025.05.0230
Abstract(71) PDF(0)
Abstract:
The efficient separation between radionuclides and boric acid in boron-containing radioactive liquid waste of nuclear power plants is crucial for achieving radioactive waste minimization. In this study, a three-stage reverse osmosis (RO) separation system using cellulose acetate membrane modules was developed to separate radionuclides (with Cs⁺ as the representative nuclide) from boric acid in simulated radioactive liquid waste. The factors including feed solution pH, boric acid concentration, Cs⁺ concentration, and operation pressure on the permeation of Cs+ and boric acid were experimentally evaluated. The separation factors between Cs⁺ and boric acid were quantitatively determined under various conditions. Experimental results revealed that the optimized three-stage RO system achieved a Cs⁺ rejection rate exceeding 85% while maintaining a total boric acid permeation rate over 90%, and the maximum separation factor reaching 6.3. This performance demonstrates the three-stage RO unit could effective separation Cs⁺ contaminants from boric acid in the waste streams. Hot tests with actual radioactive solutions confirmed the practical efficacy of the three-stage RO unit, with significant removal of γ-emitting radionuclides alongside high boric acid recovery rate. The developed three-stage cellulose acetate RO process presents a technically viable treatment approach for nuclear power plant boron-containing liquid waste, simultaneously addressing the effective separation of radionuclides from boric acid.
Research on charge accumulation effect of self-powered neutron detector and the design of measuring protecting circuit
Abstract(165) PDF(13)
Abstract:
In-Core Neutron Flux Measurement System is important system for nuclear power plant which directly monitors reactor core status. The availability of the system is related to the reliability and stability of the core component current amplification card. This paper researches the charge accumulation effect of 103Rh-SPND. Charge shock modeling and calculating of micro-current measuring circuit under the most serious working circumstance are done, based on which the protecting scheme and detail design of measuring circuit are carried out. According to the results of laboratory test and reactor test, the current amplification card without protection occurs anticipated breakdown, while the current amplification card with protection achieves the charge shock protection. Furthermore, the characteristics of amplification card such as precision, response time and so on are also guaranteed. The test results of 2 units of ACP1000 proves that this protecting scheme can improve the availability of the micro-current measuring circuit well under different kinds of working condition.
Research on Communication Method for Long-Distance Multi-Device Response Time Test of Reactor Protection System
 doi: 10.13832/j.jnpe.2025.03.0096
Abstract(138) PDF(9)
Abstract:
The response time test of the reactor protection system is crucial for ensuring the safety of the reactor. To address the challenges posed by measuring the response time of the Tricon platform reactor protection system, which involve multiple remote devices and long-distance transmission, this paper proposes a new communication method for response time testing. This method enables four-wire communication for measuring the response time of the Tricon platform reactor protection system by establishing a star topology suitable for devices distributed across different areas, particularly in situations where the rooms have high isolation or the devices are located at considerable distances. It uses four core wires to transmit both data and synchronization time signals, solving the problem of measuring the response time of multiple devices distributed across different areas. Furthermore, it has been successfully validated at the Fuqing Nuclear Power Plant, demonstrating the feasibility of the method.
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Special Contribution
Key Technologies of Medical Isotope Test Reactor
Li Qing, Zhang Jinsong, Zhang Yulong, Nie Huagang, Chen Yunming, Jiao Baoliang
2025, 46(5): 1-11.   doi: 10.13832/j.jnpe.2025.06.0260
Abstract(199) HTML(30) PDF(43)
Abstract:
The construction of a solution-type medical isotope test reactor for the production of isotopes such as 99Mo and 131I is one of the important initiatives to achieve self-sufficient and controllable supply in China's medical isotope market. This article briefly introduces the application status, production principles, and production methods of medical isotopes, as well as the development overview of homogeneous solution-type reactors both domestically and internationally. It systematically elaborates on the system composition and design of the medical isotope test reactor, including the reactor and its major systems, isotope extraction process systems, and supporting systems. Furthermore, it provides a detailed explanation of the main technical issues, such as reactivity stability, radiation protection design, prevention of fuel solution precipitation, corrosion resistance of structural materials, critical safety of fuel solutions, isotope extraction processes, uranium recovery technology, fuel purification technology, and radioactive waste gas treatment technology.
Reactor Physics and Thermohydraulics
Research on the Effect of Fuel Spatial Separation on Helium Production Behavior in Lithium-Cooled Fast Reactors
Wang Yue, Wei Bin, Wang Jincheng, Zhang Wenchao, Sun Jianchuang, Cai Weihua
2025, 46(5): 12-21.   doi: 10.13832/j.jnpe.2024.090020
Abstract(40) HTML(16) PDF(12)
Abstract:
Liquid lithium is widely utilized as a metal coolant in space fast reactors due to its smaller neutron absorption cross-section, lower density, and superior thermophysical properties, resulting in reduced core mass and enhanced heat transfer efficiency. However, under neutron irradiation, lithium reacts with neutrons to produce helium gas. The accumulation of helium increases thermal resistance in affected regions and reduces the heat transfer efficiency of system equipment. In this study, the Monte Carlo code OpenMC is employed to conduct helium production calculations for three lithium-cooled space fast reactor design models featuring different fuel space separations. The aim is to analyze the impact of these separations on the helium production behavior within the reactor core. The paper also calculates the total helium yield of the core, analyzes the helium production capacity of various nuclear reactions between liquid lithium and neutrons, and examines helium production under different 7Li enrichments, and the accurate calculation of helium production in the core is realized. Focusing on changes in helium production as a function of core burnup, the results indicate that larger fuel space separations result in higher helium production. Additionally, increasing 7Li enrichment significantly reduces helium production, with a maximum 68.76% reduction observed in helium yield when enrichment is elevated from 95% to 99%. The paper provides valuable insights for optimizing lithium-cooled space fast reactors.
Reactor Structural Materials and Structure Mechanics
Study on the Sensitivity and Prevention Measures of Ductility Dip Cracking in Stainless Steel Overlay Weld
Yang Xingwang, Jiang Baiwen, Liu Gang, Shi Chunfeng, Xu Xinzhu
2025, 46(5): 132-138.   doi: 10.13832/j.jnpe.2024.090032
Abstract(46) HTML(20) PDF(3)
Abstract:
During the in-service inspection of the bimetallic weld in the low-pressure safety injection system pipeline of a nuclear power unit, ductility dip cracking (DDC) was identified on the overlay weld surface of ЭА-395/9 welding material. Through research on the hot cracking sensitivity of the ЭА-395/9 welding material, analysis of welding stress, and experimental study of the welding process, it was determined that when the overlay welding heat input is ≥ 16.3 kJ/cm, only 5% strain is sufficient to initiate cracking and form DDC. When the welding heat input of ЭА-395/9 welding increases, the columnar crystals become coarse and chain like precipitates form at the grain boundaries, resulting in high welding stress and providing metallurgical and mechanical conditions for the occurrence of DDC. By using a welding current of 120~130A, reducing the arc lateral swing amplitude, and controlling the interlayer temperature below 100℃, it is possible to effectively prevent the formation of DDC in the overlayweld of ЭА-395/9 welding material.
Safety and Control
Research on Control Strategy of the Coolant System for Low-Temperature Heating Reactor
Jiang Qingfeng, Hong Hao, Lyu Hong, Wang Pengfei
2025, 46(5): 171-179.   doi: 10.13832/j.jnpe.2024.090030
Abstract(39) HTML(11) PDF(13)
Abstract:
To ensure the operation safety of low-temperature heating reactors, it is crucial to study reactor power control strategies that meet their operational requirements. To this end, this study takes the low-temperature heating reactor coolant system as the research object and proposes two control strategies: a dual-feedback control strategy and a cascade control strategy. Their respective effects on the coupled control of reactor power and core coolant outlet temperature are investigated. The simulation results show that both control strategies can effectively control the low-temperature heating reactor coolant system under step and linear load change conditions. Under the cascade control strategy, the coolant outlet temperature is the main controlled variable, whose change magnitude is small in the load change conditions, but the settling time of reactor power is prolonged. Therefore, the cascade control strategy is more suitable for the linear load change conditions. Under the double-feedback control strategy, the reactor power control channel and the temperature control channel are in a parallel configuration, allowing both control performances to be taken into account. Therefore, the double-feedback control strategy is more suitable for the step load change conditions. This study can provide a reference for the development and optimization of low-temperature heating reactor coolant system control strategy.
Column of National Key Laboratory of Nuclear Reactor Technology
Development Opportunities and Challenges for China's Nuclear Power Equipment under the "Dual Carbon" Goals
Tang Chuanbao, Chai Xiaoming, Zhu Yonghui, He Xiaoqiang, Fu Guozhong, Yu Zeyuan, Li Rui
2025, 46(5): 205-210.   doi: 10.13832/j.jnpe.2025.04.0184
Abstract(29) HTML(19) PDF(6)
Abstract:
Nuclear power is a safe, economical, and efficient clean energy source that serves as a strong support for China's national strategy of "Carbon Peaking and Carbon Neutrality". Nuclear power equipment is the core enabler of nuclear power plants' critical functions. This paper analyzes the development status of nuclear power in China and elaborates on the current state of nuclear power equipment. It examines development opportunities in two major directions: power generation and multi-purpose applications. The challenges faced by nuclear power equipment are identified, including performance improvements of existing equipment, R&D of equipment for advanced reactor types, and the establishment and transformation of the industrial chain. Development suggestions are provided, which may serve as a reference for the high-quality development of China's nuclear power equipment.
Column of Nuclear Power Equipment Fault Diagnosis
Identification Technology of Weak Collision Mechanical Noise of Reactor Lower Grating Plate Base on WPD and Kurtosis
Liu Jiaxin, Bao Yufeng, Zhe Na, Wang Jin, Duan Zhiyong, Liu Caixue, Yang Taibo
2025, 46(5): 217-223.   doi: 10.13832/j.jnpe.2024.10.0049
Abstract(28) HTML(9) PDF(7)
Abstract:
The loose parts carried by the coolant in the reactor primary circuit can move to the lower grating plate, causing collisions with the lower grating plate and further blocking the diversion hole. After being transmitted to the top cover of the reactor pressure vessel through internal structures, the collision mechanical noise of the lower grating plate experiences signal attenuation and is masked by the reactor background noise, making direct identification impossible. Therefore, this study first conducted simulation tests to obtain background noise data and weak collision mechanical noise data of the lower grating plate. Then, wavelet packet decomposition (WPD) combined with a kurtosis threshold method was used to denoise the weak collision mechanical noise submerged in background noise. Finally, based on the denoised collision signal, loose parts collision identification was performed, and a code for identifying collision events of the lower grating plate in the reactor was developed. Test results show that the proposed denoising method is effective, and the developed code can effectively identify the signals of lower grating plate collision events submerged in background noise.
Column of Artificial Intelligence Technology and Its Application in Reactor Engineering
Research on Intelligent Online Monitoring and Robust Self-Correction for Nuclear Reactor Sensors
Xu Fenqin, Yan Xiaoyu, Pang Bo, Zhao Dou, Tu Yan
2025, 46(5): 234-242.   doi: 10.13832/j.jnpe.2024.090019
Abstract(52) HTML(15) PDF(8)
Abstract:
A novel training dataset processing method with high robustness was proposed to address the poor robustness in data-driven analytic redundant sensor models, and an sensor online monitoring and self-correction method was developed based on a auto-associative multivariate Long Short-Term Memory (LSTM) artificial neural network model. The method was validated using actual sensor measurement data retrieved from a pressurized water reactor engineering test facility. The results indicate that this research method can achieve high-precision and robust reconstruction of sensor signals, hence meets the requirements of online monitoring and robust self-correction of nuclear reactor sensors.
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Development Status and Outlook for Nuclear Power in China
Zhao Chengkun
2018, 39(5): 1-3.   doi: 10.13832/j.jnpe.2018.05.0001
[Abstract](1669) [PDF 461KB](23)
摘要:
主要介绍了我国在建、在运核电机组的基本状况和最新进展,以及我国在提升核设施安全水平方面的相关措施。在国家能源局印发的《能源技术创新“十三五”规划》要求之下,我国推出一系列先进核能和小型堆的发展计划,开展了“海洋核动力平台示范工程建设”并建立相关标准。最后总结了中国核电目前面临的挑战和未来的展望。
Initiation and Development of Heat Pipe Cooled Reactor
Yu Hongxing, Ma Yugao, Zhang Zhuohua, Chai Xiaoming
2019, 40(4): 1-8.  
[Abstract](2253) [PDF 1128KB](638)
摘要:
 
热管冷却反应堆采用固态反应堆设计理念,通过热管非能动方式导出堆芯热量。本文总结了热管冷却反应堆的概念初创、积极探索、重大突破的发展历程;分析了热管冷却反应堆的技术特点,包括固态属性、固有安全性高、运行特性简单、易于模块化与易扩展和运输特性良好等核心优势;归纳了热管冷却反应堆中热管性能、材料工艺、能量转换等技术现状,并提出热管冷却反应堆进一步发展将面临的材料、制造工艺、运行可维护性等挑战,从而明确了热管冷却反应堆未来的发展趋势,为革新型热管冷却反应堆技术的发展与应用提供良好的方向指引。总体而言,热管冷却反应堆在深空探测与推进、陆基核电源、深海潜航探索等场景中具有广阔的应用前景,有可能成为改变未来核动力格局的颠覆性技术之一。
Development and Prospect of Advanced Nuclear Energy Technology
Wang Conglin, Chai Xiaoming, Yang Bo, Li Zhongchun
2023, 44(5): 1-5.   doi: 10.13832/j.jnpe.2023.05.0001
[Abstract](3255) [FullText HTML](362) [PDF 4884KB](533)
摘要:
“碳达峰、碳中和”目标的提出对我国未来能源体系发展具有深远影响。核能作为稳定的清洁能源,对于“碳达峰、碳中和”目标实现能够发挥更大作用,在发电、供热、制氢等领域均有着巨大的应用前景和需求。经过60余年发展,核能建立了完善的产业链,研发形成了“华龙一号”等具有完全自主知识产权的第三代大型商业压水堆核电技术品牌,研发了具有国际先进水平的多用途模块式小型堆“玲龙一号”,积极探索了钠冷快堆、超高温气冷堆、熔盐堆等第四代先进核能技术,持续开展聚变核能利用。同时我国核能发展也面临一些挑战,先进核能技术亟需突破。本文提出了先进核能技术的发展思路和路径,从在役核电厂智能化运行管理、三代核电批量化部署、固有安全快堆技术研发、积极研发满足高效制氢需求的超高温气冷堆、积极探索能够满足工业供热和平台供电的模块式小型堆技术、国内国际合作发展先进核能关键技术等6个方面进行了展望,为我国先进核能技术的发展给出了具体的研究目标与方向。
Thermodynamic Analysis of Coupling Supercritical Carbon Dioxide Brayton Cycles
Huang Xiaoli, Wang Junfeng, Zang Jinguang
2016, 37(3): 34-38.   doi: 10.13832/j.jnpe.2016.03.0034
[Abstract](130) [PDF 918KB](2)
摘要:
基于热力学第一定律,开展超临界二氧化碳(S-CO2)布雷顿循环的热力学特性研究。在设备模型构建和初始条件假设的基础上,研究系统采用再压缩循环的热力学特性和参数限制条件。针对进出口温差较大的热源系统,提出了复叠式分流循环方案,开展热力学特性分析和评价,并与再压缩循环进行定量比较,得出各自的适用对象。
Present Situation and Prospect of Radioactive Waste Liquid Treatment Technology
Sun Shouhua, Ran Mingdong, Lin Li, Liu Wenlei, Li Zhenchen, Li Wenyu
2019, 40(6): 1-6.   doi: 10.13832/j.jnpe.2019.06.0001
[Abstract](1819) [PDF 178KB](817)
摘要:
放射性废液得到有效处理是世界各国核工业迅猛发展的前提,其关键技术的现状和发展方向也是我国核工业界关注的焦点。本文介绍了几种放射性废液处理的传统方法及涌现出的新技术,概述了各种方法的原理及优、缺点,同时讨论了放射性废液处理技术今后的研究方向及发展趋势。
Condition Prediction of Reactor Coolant Pump in Nuclear Power Plants based on the Combination of ARIMA and LSTM
Zhu Shaomin, Xia Hong, Lyu Xinzhi, Lu Chuan, Zhang Jiyu, Wang Zhichao, Yin Wenzhe
2022, 43(2): 246-253.   doi: 10.13832/j.jnpe.2022.02.0246
[Abstract](949) [FullText HTML](236) [PDF 19773KB](88)
摘要:
为了对核电厂主泵的运行过程进行监测和追踪,进而提高主泵的预警能力,提出了基于差分自回归移动平均(ARIMA)和长短期记忆(LSTM)神经网络组合模型的主泵状态预测方法,并用该方法对某核电厂主泵止推轴承温度和可控泄漏流量进行单步和多步预测,以根均方误差(RMSE)为指标对预测精度进行评估。结果表明,所建立的ARIMA和LSTM神经网络组合模型能够对主泵的状态进行准确的预测和追踪,并且组合模型的预测精度要优于ARIMA和LSTM单一模型,尤其在多步预测中,组合模型的优势更加明显。
Remaining Useful Life Prediction of Rolling Bearings Based on Attention Mechanism and CNN-BiLSTM
Fu Guozhong, Du Hua, Zhang Zhiqiang, Li Qingzhao, Huang Siyu, Liu Yanting
2023, 44(S2): 33-38.   doi: 10.13832/j.jnpe.2023.S2.0033
[Abstract](697) [FullText HTML](258) [PDF 4155KB](53)
摘要:
针对传统深度学习方法对滚动轴承剩余使用寿命(RUL)预测准确性不高的问题,提出一种基于注意力机制的卷积神经网络和双向长短期记忆网络的混合RUL模型(CNN-BiLSTM-AM),并运用该混合模型对滚动轴承的RUL进行预测。首先通过轴承原始振动信号的峭度特征确定轴承首次预测时间(FPT);其次对FPT后的原始振动信号进行降噪、归一化处理并通过CNN-BiLSTM-AM混合模型对2种不同工况下的滚动轴承的RUL进行预测;最后,将CNN-BiLSTM-AM混合模型与几种传统模型进行对比。结果表明,CNN-BiLSTM-AM混合模型对滚动轴承的RUL更为有效,并具有泛化性能。
Reliability of Digital Pressure Control Device of Nuclear Pressurizer Based on Dynamic Fault Tree
Qian Hong, Gu Yaqi, Liu Xinjie
2019, 40(3): 103-108.   doi: 10.13832/j.jnpe.2019.03.0103
[Abstract](1276) [PDF 0KB](2)
摘要:
以配置四取中逻辑输入模块的核电厂稳压器数字压力控制装置为研究对象,建立其故障树模型,包括四取中逻辑的动态部分和其他设备的静态部分,采用马尔科夫方法分析动态部分,再根据逻辑关系分析整体故障树,最后,围绕可靠度和重要度评价四取中逻辑的可靠性及其对整个装置可靠性的提升效果,结果表明:四取中逻辑在可靠性方面优化程度相对较高。
General Technology Features of Reactor Core and Safety Systems Design of HPR1000
Yu Hongxing, Zhou Jinman, Leng Guijun, Deng Jian, Liu Yu, Wu Qing, Liu Wei
2019, 40(1): 1-7.   doi: 10.13832/j.jnpe.2019.01.0001
[Abstract](1698) [PDF 0KB](24)
摘要:
“华龙一号”是我国自主设计研发的具有完整知识产权的第三代百万千瓦级压水堆核电技术。本文介绍了“华龙一号”的产生历程,系统论述了“华龙一号”反应堆堆芯与安全设计特点,包括“华龙一号”研发过程中开展的堆芯核设计、热工水力设计、安全设计、设计验证及“华龙一号”持续开展的设计改进与优化等内容,通过采用新的设计理念和设计技术,全面提高了“华龙一号”作为三代核电技术的经济性、灵活性和安全性。
Research on Condition Monitoring Technology for Nuclear Power Plant Equipment Based on Kernel Principal Component Analysis
Wu Tianhao, Liu Tao, Shi Haining, Zhang Tao, Tang Tang
2020, 41(5): 132-137.  
[Abstract](679) [PDF 0KB](8)
摘要:
为解决核电厂传统监测手段的局限性,提出将核主元分析法(KPCA)引入核电厂设备在线监测领域中,并设计了监测模型建设方法以及在线监测策略。为验证算法的有效性,将其应用在国内某核电机组电动主给水泵的真实监测案例中。仿真结果表明,KPCA算法可适应核电厂设备监测的要求,能比现有阈值监测手段提供更为早期的故障预警。同时,相比于常规的主元分析法(PCA),KPCA算法能够提取各变量之间的非线性关系,识别出设备不同的运行模式,有效减少误报警。
Evelopment Characteristics and Inspiration of Marine Nuclear Power
Lu Chuan, Wang Zhonghui, Yu Junchong
2022, 43(1): 1-6.   doi: 10.13832/j.jnpe.2022.01.0001
[Abstract](3712) [FullText HTML](1149) [PDF 2825KB](1149)
Abstract:
The marine nuclear power technology of the United States and Russia has been leading the world for a long time, and their development experience and technical context have high reference value. Through the analysis and research on the main development process and technology of marine nuclear power in the United States and Russia, this paper innovatively summarizes the common development laws of marine nuclear power in the United States and Russia, such as basic type of reactor system, general test platform and differential configuration from the aspects of technical route and trend, a series of common and differential characteristics followed by marine nuclear power technology in the United States and Russia are excavated and refined, which can provide some reference and enlightenment for the development of marine nuclear power.
Digital Reactor: Development and Challenges
Yu Hongxing, Li Wenjie, Chai Xiaoming, Li Songwei
2020, 41(4): 1-7.  
[Abstract](1703) [PDF 466KB](276)
Abstract:
The digital reactor is an integral numerical simulation platform for the performance of nuclear reactor systems. In the first part of this paper, the development history of the nuclear reactor simulation technology is reviewed. The three technical elements constituting the digital reactor are elaborated, including the target scenario, advanced models and multi-physics coupling technology, and the integrating environment. Although there are several challenges for the development of digital reactors, such as the difficulties in multi-physics and multi-scale computation, the complexity in design optimization, and the insufficient database, the digital reactor can help better analyze key problems that limiting the reactor performances and safety, and better understand the mechanism of  the phenomena that cannot be observed or measured experimentally.
Nuclear Power AI Applications: Status, Challenges and Opportunities
Zhang Heng, Lyu Xue, Liu Dong, Wang Guoyin, Hang Qin, Sha Rui, Guo Bin
2023, 44(1): 1-8.   doi: 10.13832/j.jnpe.2023.01.0001
[Abstract](10593) [FullText HTML](952) [PDF 2166KB](952)
Abstract:
In recent years, artificial intelligence (AI) technology has been widely used in the field of nuclear power to promote nuclear power plants to achieve the goal of improving production efficiency, reducing operating costs and improving operating safety through self diagnosis, self optimization and self adaptation. This paper introduces the AI technology often used in the nuclear power field, summarizes its research status in four typical application scenarios of the nuclear industry, namely, intelligent mine, intelligent design, intelligent manufacturing and intelligent operation and maintenance. Finally, it analyzes the challenges and development trends of the application of AI technology in the nuclear power field from three aspects: data samples, network security, and the explanatory nature of deep learning.
Key Technology of ACP100: Reactor Core and Safety Design
Song Danrong, Li Qing, Qin Dong, Dang Gaojian, Zeng Chang, Li Song, Xiao Renjie, Wei Xuedong
2021, 42(4): 1-5.   doi: 10.13832/j.jnpe.2021.04.0001
[Abstract](6591) [FullText HTML](1732) [PDF 4887KB](1732)
Abstract:
Small modular reactor is a new kind of nuclear energy system. The ACP100 is a multi-purpose modular small PWR with full intellectual property in China. This paper introduces the research and development process, the main characteristics of the reactor core and safety design technology, mainly including the nuclear design, thermal-hydraulic design, safety design concept, inherent safety design, and the strategy for accidents. Through the combination of the deterministic theory and the probabilistic safety assessment, the safety of ACP100 is greatly improved and exceeds the Generation 3 nuclear power plant safety standards.
Present Situation and Prospect of Radioactive Waste Liquid Treatment Technology
Sun Shouhua, Ran Mingdong, Lin Li, Liu Wenlei, Li Zhenchen, Li Wenyu
2019, 40(6): 1-6.   doi: 10.13832/j.jnpe.2019.06.0001
[Abstract](1819) [PDF 178KB](136)
Abstract:
The effective disposal of radioactive waste liquid is the precondition for the rapid development of nuclear industry all over the world, and the current situation and development direction of its key technologies are the focus of attention of the nuclear industry in China. This paper introduces several traditional methods of radioactive waste liquid treatment and the emerging new technology options, summarizes the principles, advantages and disadvantages of various methods, and discusses the research direction and development trend of radioactive waste liquid treatment technology in the future.
Research on the Development Trend of Micro Nuclear Reactor Technology
Du Shuhong, Li Yonghua, Sun Tao, Wang Jun, Liu Xiaowen, Su Gang, Zhao Depeng
2022, 43(4): 1-4.   doi: 10.13832/j.jnpe.2022.04.0001
[Abstract](2870) [FullText HTML](529) [PDF 2053KB](529)
Abstract:
Micro nuclear reactors adopt Generation-IV non-light water reactors, heat pipe reactors and Generation-III light water reactors with high inherent safety, providing long-term and highly reliable power supply for innovative scenario such as remote islands, mining areas, border guard posts and bases, emergency and disaster relief, space exploration and deep-sea exploration. They have broad application prospects, being one of the important technical supports to realize the national strategy. This study summarizes the definition and main R & D reactor types of micro nuclear reactors, and describes the innovative technological characteristics of micro nuclear reactors, such as high inherent safety, easy modularization and expansion, transportability, easy deployment, independent operation and so on, analyzes the development trend of key technologies such as new fuel, integration of main loop, new thermoelectric conversion device, passive safety system, intelligent operation and maintenance and coupling of nuclear energy and other energy sources in China, providing support for the formulation of the technical route for the development of micro nuclear reactors in China.
Solving Multi-Dimensional Neutron Diffusion Equation Using Deep Machine Learning Technology Based on PINN Model
Liu Dong, Luo Qi, Tang Lei, An Ping, Yang Fan
2022, 43(2): 1-8.   doi: 10.13832/j.jnpe.2022.02.0001
[Abstract](4371) [FullText HTML](778) [PDF 31918KB](778)
Abstract:
This paper elaborates the physics-informed neural network model (PINN), constructs a deep neural network as a trial function, substitutes it into the neutron diffusion equation to form a residual, and takes it as the weighted loss function of machine learning, and then approaches the numerical solution of the neutron diffusion equation by deep machine learning technique; According to the characteristics of diffusion equation, this paper puts forward innovative key technologies such as accelerated convergence method of eigenvalue equation, efficient parallel search technology of effective multiplication coefficient (keff), learning sample grid point uneven distribution strategy, and analyzes the sensitivity of key parameters such as neural network depth, neuron number, boundary condition loss function weight and so on. The verification calculation results show that the method has good accuracy, and the proposed key technology has remarkable results, and explores a new technical approach for the numerical solution of the neutron diffusion equation.
Initiation and Development of Heat Pipe Cooled Reactor
Yu Hongxing, Ma Yugao, Zhang Zhuohua, Chai Xiaoming
2019, 40(4): 1-8.  
[Abstract](2253) [PDF 1128KB](383)
Abstract:
The heat pipe cooled reactor adopts the solid-state reactor design concept and passively transfer the heat out of the core through heat pipes. This paper summarizes the development history of the heat pipe cooled reactor, from the conceptual initiation, the active exploration and to the breakthrough. The technical characteristics of heat pipe cooled reactors are analyzed, including the key advantages, such as solid properties, inherent safety, simple operation, easy modularization and expansion, and transportability. In addition, this paper summarizes the technical status of heat pipe performance, material technology and energy conversion in heat pipe cooled reactors. The challenges in the further development of heat pipe cooled reactors are put forward, such as material technique, manufacturing, and operation maintainability. The future development trend of heat pipe cooled reactors is clarified, which provides a direction for the development and application of the innovative heat pipe cooled reactor technology. Overall, the heat pipe cooled reactor has broad application prospects in deep space exploration and propulsion, land-based nuclear power supply, sea exploration and other scenarios,  which may become one of the most creative technologies to change the future nuclear power patterns.
Thoughts on the Application of Artificial Intelligence in Nuclear Energy Field
Tan Sichao, Li Tong, Liu Yongchao, Liang Biao, Wang Bo, Shen Jihong
2023, 44(2): 1-8.   doi: 10.13832/j.jnpe.2023.02.0001
[Abstract](3496) [FullText HTML](236) [PDF 4371KB](236)
Abstract:
Under the new wave of global artificial intelligence, the nuclear energy industry has gradually started the process of integrating with the development of artificial intelligence. This paper discusses some problems arising from the combined application of artificial intelligence and nuclear energy. First of all, it clarifies the application advantages of artificial intelligence in the field of nuclear energy. Artificial intelligence technology can enhance the economical efficiency and functionality of nuclear energy by reducing the operating costs, improving the power generation efficiency and optimizing the control strategies. Secondly, it holds the key to the integration of artificial intelligence and nuclear energy, that is, applying key supporting techniques such as big data, cloud computing, and the Internet of Things, and realizing the best fitting of artificial intelligence technology to nuclear engineering problems according to the application scenarios and boundaries in the nuclear energy field. Then, it determines the personnel-led issues in the process of nuclear energy intelligentialization, where the nuclear industry personnel will lead the realization of the effective fitting and integration of artificial intelligence and nuclear engineering problems, thereby promoting the development of nuclear energy intelligence. Finally, it realizes people's recognition and acceptance of nuclear energy intelligence and discusses how to build an intelligent and trusted security system for nuclear energy from the perspectives of data, algorithms, standardization, security, and public acceptance so that nuclear industry personnel and the public accept nuclear energy intelligence. Through the elaboration of several issues in the process of nuclear energy intelligentialization, it is expected to arouse the common thinking of nuclear industry personnel and the public, promote the cross-disciplinary deep integration of artificial intelligence and nuclear energy science and technology and then realize the in-depth empowerment of artificial intelligence to the nuclear energy industry.
CFD Investigation on Flow and Heat Transfer Characteristics of Fuel Assembly for VVER Reactor
Wang Xiong, Du Daiquan, Zeng Xiaokang, Yang Xiaoqiang, Zan Yuanfeng
2018, 39(3): 6-9.   doi: 10.13832/j.jnpe.2018.03.0006
[Abstract](1835) [PDF 768KB](172)
Abstract:
The flow and heat transfer characteristics of AFA fuel assembly for VVER reactors have been investigated using computational fluid dynamics(CFD) simulation. The flow field, pressure drop and temperature distribution of the coolant in AFA under normal regime have been calculated. The results show that the pressure drop of the spacer grid of AFA is lower than that of the grid having mixing vane. The stagnation zone of coolant appears around the rim of the spacer grid and causes higher temperature in the periphery region of AFA. The power ratio of the circumferential pin around instrumental tube(Kc) with different values has a great effect on the measured temperature of the coolant at FA outlet. The results can be referred in the setting of temperature warning value(ΔTt) for the reactor core during the operation of nuclear power plants.
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