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Control rod drive for high temperature gas cooled reactor

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Nuclear Science and Techniques 1998年第1期9卷 45-46页

作者： DengJun－Xian XuJi－Ming 等 BeijingInstituteofNuclearEngineering Beijing100840

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ＣｏｎｔｒｏｌｒｏｄｄｒｉｖｅｆｏｒｈｉｇｈｔｅｍｐｅｒａｔｕｒｅｇａｓｃｏｏｌｅｄｒｅａｃｔｏｒＤｅｎｇＪｕｎＸｉａｎ，ＸｕＪｉＭｉｎｇ，ＸｉａｏＳｈｕＲｕ，ＺｈａｎｇＨａｎ，ＹａｎｇＳｈｅｎＨｕａ，ＬｉｕＡｉＪｕｎ，ＺｈａｎｇＥｎＨ...

关键词：核反应堆高温气体冷却控制棒驱动

HPR1000： Advanced Pressurized Water Reactor with Active and Passive Safety

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Engineering 2016年第1期2卷 79-87页

作者： Ji xing Daiyong Song Yuxiang Wu China Nuclear Power Engineering Co. Ltd. Beijing 100840 China

HPR1000 is an advanced nuclear power plant(NPP)with the significant feature of an active and passive safety design philosophy,developed by the China National Nuclear *** one hand,it is an evolutionary design based on proven technology of the existing pressurized water reactor NPP;on the other hand,it incorporates advanced design features including a 177-fuel-assembly core loaded with CF3 fuel assemblies,active and passive safety systems,comprehensive severe accident prevention and mitigation measures,enhanced protection against external events,and improved emergency response *** verification experiments and tests have been performed for critical innovative improvements on passive systems,the reactor core,and the main *** design of HPR1000fulfills the international utility requirements for advanced light water reactors and the latest nuclear safety requirements,and addresses the safety issues relevant to the Fukushima *** with its outstanding safety and economy,HPR1000 provides an excellent and practicable solution for both domestic and international nuclear power markets.

关键词： HPRI000 Active and passive safety Advanced nuclear power reactor

Mesh‑free semi‑quantitative variance underestimation elimination method in Monte Caro algorithm

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Nuclear Science and Techniques 2023年第1期34卷 157-171页

作者： Peng‑Fei Shen Xiao‑Dong Huo Ze‑Guang Li Zeng Shao Hai‑Feng Yang Peng Zhang Kan Wang Department of Engineering Physics Tsinghua UniversityBeijing 100084China China Nuclear Power Engineering Corporation Beijing 100840China

The inter-cycle correlation of fission source distributions(FSDs)in the Monte Carlo power iteration process results in variance underestimation of tallied physical quantities,especially in large local *** study provides a mesh-free semiquantitative variance underestimation elimination method to obtain a credible confidence interval for the tallied *** method comprises two procedures:Estimation and *** FSD inter-cycle correlation length is estimated in the Estimation procedure using the Sliced Wasserstein distance *** batch method was then used in the elimination *** FSD inter-cycle correlation length was proved to be the optimum batch length to eliminate the variance underestimation *** exemplified this method using the OECD sphere array model and 3D PWR BEAVRS *** results showed that the average variance underestimation ratios of local tallies declined from 37 to 87%to within±5%in these models.

关键词： Monte Carlo algorithm Power iteration process Inter-cycle correlation Variance underestimation Sliced Wasserstein distance

Research of in-service sipping test device

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Nuclear Science and Techniques 1998年第2期9卷 113-114页

作者： Deng Jun-Xian Zhao Xi-Juan Ye Xiao-Li Zhao Hong Zhang Han Zhang En-Hai Gao Yan-Gang Liu Ying-Lin Song Ruo Li Yong-Yuan Liu Ai-Jun Zhao Ping-Jun (Beijing Institute of Nuclear Engineering, Beijing 100840 )Xu Yu-Ming (China National Nuclear Corpora Beijing Institute of Nuclear Engineering Beijing 100840 China China National Nuclear Corporation Beijing 100822 China

Sipping test device is used to identify the tightness of the irradiated fuel assembly during refuelling campaign. The gas is selected as the medium and the xenon-133 as the indicating nuclide. The device consists of the gas system, the γ-activity detection and measurement system, the power supply and signal system, the mechanical components and *** device has satisfactory functions, e.g. easy operation, indication in instrumentation, chart record and acoustic alarm, which can meet the operation demand of the nuclear reactor.

关键词：核裂变产物细微探测器件细微技术

BoxCox multi-output linear regression for 10.7 cm solar radio flux prediction

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Research in Astronomy and Astrophysics 2021年第4期21卷 225-234页

作者： Rui-Fei Cui Ya-Guang Zhu Huan Zhang Ri-Wei Zhang Hong-Yu Zhao Zheng-Lian Li State Key Laboratory of Astronautic Dynamics Xi’an 710043China Beijing Information and Communication Research Center Beijing 100840China

We consider the problem of predicting the mid-term daily 10.7 cm solar radio flux(F10.7),a widely-used solar activity index.A novel approach is proposed for this task,in which BoxCox transformation with a proper parameter is first applied to make the data satisfy the property of homoscedasticity that is a basic assumption of regression models,and then a multi-output linear regression model is used to predict future F10.7 *** experiment shows that the BoxCox transformation significantly improves the predictive performance and our new approach works substantially better than the prediction from the US Airforce and other alternative methods like Auto-regressive Model,Multi-layer Perceptron,and Support Vector Regression.

关键词： Sun:radio radiation methods:data analysis methods:statistical

BIFURCATION SOLUTIONS OF RESONANT CASES OF NONLINEAR MATHIEU EQUATIONS

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Science China Mathematics 1990年第12期33卷 1469-1476页

作者：陈予恕梅林涛 Tianjin University Tianjin 300072 PRC The Second Designing Institute Ministry of Nuclear Industry Beijing 100840 PRC

The bifurcation solutions of resonant cases, including the main resonance, subharmonic resonance, superharmonic resonance and fractional resonance, are studied with the Liapunov-Schmidt method. The (α’,β’)-plane of every resonant case divides into six open regions; all points inside any one of the six regions give topologically equivalent response diagrams. The boundary arcs separating these six regions are of two distinct types: five of them are of the normal codimension-1 and one is of infinite codimensions. The theoretical base of vibration, control of nonlinear systems is presented.

关键词： resonance bifurcation solution nonlinear Mathieu equation symmetry.

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华龙一号机组在线维修优化研究

核动力工程 2024年第1期45卷 225-229页

作者：丁小川李文静冯楚然杨晓燕中国核电工程有限公司北京100840

开展在线维修以减少机组大修的维修项目是优化大修工期、提升机组经济性的重要手段,国外已利用实时配置风险计算工具计算风险指引型完成时间(RICT),并在此基础上开展了在线维修。本文在不借助实时配置风险计算工具的前提下,利用风险指... 详细信息

开展在线维修以减少机组大修的维修项目是优化大修工期、提升机组经济性的重要手段,国外已利用实时配置风险计算工具计算风险指引型完成时间(RICT),并在此基础上开展了在线维修。本文在不借助实时配置风险计算工具的前提下,利用风险指引型方法对华龙一号(HPR1000)机组开展在线维修的可行性进行了论证。研究表明,为开展在线维修需要将1列安全系统不可用的前限完成时间(FSCT)从3 d永久性地调整为7 d,得益于HPR1000机组的整体设计平衡及优化,单一设备重要性下降,与风险阈值相比该变化导致的风险增量是有限的。在未来完善并应用实时配置风险计算工具后,可以提高在线维修方案的灵活性,并进一步延长维修期限以减轻维修的进度压力。

关键词：风险指引前限完成时间(FSCT) 在线维修

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棱柱式超级安全气冷堆堆芯物理特性研究

原子能科学技术 2023年第1期57卷 156-164页

作者：张成龙袁媛刘国明杨海峰中国核电工程有限公司北京100840

棱柱式超级安全气冷堆是可作为可移动微型核电装置的先进堆型之一。为研究其堆芯物理特性,利用蒙特卡罗程序建立堆芯模型,设计出一种堆芯装载方案和反应性控制方案,研究了燃耗、功率分布、中子通量密度分布、中子能谱、温度负反馈等特性... 详细信息

棱柱式超级安全气冷堆是可作为可移动微型核电装置的先进堆型之一。为研究其堆芯物理特性,利用蒙特卡罗程序建立堆芯模型,设计出一种堆芯装载方案和反应性控制方案,研究了燃耗、功率分布、中子通量密度分布、中子能谱、温度负反馈等特性,并初步分析了氙震荡。研究结果表明,该堆芯可实现热功率5 MW、寿期3 a的设计;径向功率分布均匀,轴向功率分段呈凹曲线形式;中子通量密度水平较低;中子能谱受温度影响较大,受燃耗影响较小;温度系数受燃耗、温度影响显著,燃料、活性区石墨系数为负值,反射层石墨系数为小的正值,堆芯具备事故工况下仅依靠温度负反馈自动停堆的安全性。氙震荡幅度很小,满功率停堆的碘坑深度仅-110 pcm,堆芯稳定性好。

关键词：棱柱式气冷堆超级安全堆芯装载方案堆芯物理特性氙致反应性

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Preparation of SiC coated graphite composite powders by nitriding combustion synthesis

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Journal of Advanced Ceramics 2023年第10期12卷 1930-1945页

作者： Biao Zhang Wenqi Xie Huaizhi Lin Zhilei Wei Zhichao Xiao Kai He Zhongqi Shi State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China China Nuclear Power Engineering Co. Ltd.Beijing 100840China

Ceramic-coated graphite powders are considered as effective raw materials to fabricate three-dimensional continuous ceramic skeleton-reinforced graphite matrix composites which can overcome their inherent poor densification and improve their mechanical and antioxidation ***,the morphology and thickness regulation of ceramic coatings on graphite particles are still a great ***,SiC-coated graphite(graphite@SiC)powders were prepared by nitriding combustion synthesis using Si and graphited mesocarbon microbead(MCMB)as raw powders with polytetrafluoroethylene(PTFE)as a *** effects of the PTFE content and the Si/MCMB molar ratio on the phase composition and coating morphology were *** phase transition and microstructure evolution of a combustion synthesis(CS)process were revealed by a gas-released quenching *** the Si/MCMB molar ratio was 1:3 and the PTFE content was 10 wt%,the thickness of the SiC coating synthesized under 2 MPa N_(2)reached 1.14μ*** corresponding sintered graphite@SiC composite had relative density of 99.2%and flexural strength of 231 MPa,accompanied by a significant improvement in high-temperature antioxidation *** as-synthesized graphite@SiC powders with good sinterability and antioxidation properties show great promise for applications in the nuclear industry and other extreme fields.

关键词： SiC-coated graphite powders nitriding combustion synthesis(CS) antioxidation properties