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Liquid metal thermal hydraulics R&D at European scale:achievements and prospects

Frontiers in Energy 2021年第4期15卷 842-853页

作者： Ferry ROELOFS Antoine GERSCHENFELD Katrien Van TICHELEN Nuclear Research and Consultancy Group(NRG) Westerduinweg 31755 LEPettenThe Netherlands CEA DES UniversitéParis-SaclayF-91191 Gif-sur-YvetteFrance SCK CEN Boeretang 2002400 MolBelgium

A significant role for a future nuclear carbonfree energy production is attributed to fast reactors,mostly employing a liquid metal as a *** paper summarizes the efforts that have been undertaken in collaborative projects sponsored by the European Commission in the past 20 years in the fields of liquid-metal heat transfer modeling,fuel assembly and core thermal hydraulics,pool and system thermal hydraulics,and establishment of best practice guidelines and verification,validation,and uncertainty quantification(UQ).The achievements in these fields will be presented along with the prospects on topics which will be studied collaboratively in Europe in the years to *** prospects include further development of heat transfer models for applied computational fluid dynamics(CFD),further analysis of the consequences of fuel assembly blockages on coolant flow and temperature,analysis of the thermal hydraulic effects in deformed fuel assemblies,extended validation of three-dimensional pool thermal hydraulic CFD models,and further development and validation of multi-scale system thermal hydraulic methods.

关键词： liquid metal thermal hydraulics Europe

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Scaling Analysis of thermal-hydraulics for Steam Generator Passive Heat Removal System

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Journal of Shanghai Jiaotong university(Science) 2014年第2期19卷 219-225页

作者：周源林萌陈金波王汉林 School of Nuclear Science and Engineering Shanghai Jiaotong University The Nuclear Power Institute of China

Steam generator passive heat removal system(SG-PHRS) is used as a passively safe mode to provide decay heat removal in some advanced pressurized water reactors. Due to the structure characteristics of steam generator(SG), there are two natural circulation loops coupling in SG-PHRS in case of a safety-related event. The existing natural circulation scaling criteria could be used to simulate the natural circulation inside SG. Two-phase natural circulation loop is studied carefully, and the dominant effects of SG on behaviors of natural circulation in passive heat removal system are presented. Based on the understanding of SG-PHRS operation, system pressure transient scaling and two-phase natural circulation scaling are analyzed by establishing the relevant continuity,integral momentum and energy equations in one-dimensional area-averaged forms. With modified equations,similarity criteria for SG-PHRS are obtained for engineering application. In addition, equal height simulation and reduced height simulation are studied.

关键词： steam generator natural circulation scaling simulation thermal hydraulics

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An improved analysis method for assessing the nuclear-heating impact on the stability of toroidal field magnets in fusion reactors

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Nuclear Science and Techniques 2024年第6期35卷 163-176页

作者： Yu-Dong Lu Jin-Xing Zheng Xu-Feng Liu Huan Wu Jian Ge Kun Xu Ming Li Hai-Yang Liu Lei Zhu Fei Liu Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China

The superconducting magnet system of a fusion reactor plays a vital role in plasma confinement,a process that can be dis-rupted by various operational factors.A critical parameter for evaluating the temperature margin of superconducting magnets during normal operation is the nuclear heating caused by D-T *** study investigates the impact of nuclear heat-ing on a superconducting magnet system by employing an improved analysis method that combines neutronics and thermal *** the magnet system,toroidal field(TF)magnets are positioned closest to the plasma and bear the highest nuclear-heat load,making them prime candidates for evaluating the influence of nuclear heating on *** enhance the modeling accuracy and facilitate design modifications,a parametric TF model that incorporates heterogeneity is established to expedite the optimization design process and enhance the accuracy of the computations.A comparative analysis with a homogeneous TF model reveals that the heterogeneous model improves accuracy by over 12%.Considering factors such as heat load,magnetic-field strength,and cooling conditions,the cooling circuit facing the most severe conditions is selected to calculate the temperature of the *** selection streamlines the workload associated with thermal-hydraulic *** approach enables a more efficient and precise evaluation of the temperature margin of TF ***,it offers insights that can guide the optimization of both the structure and cooling strategy of superconducting magnet systems.

关键词： Superconducting magnet Nuclear heating Neutronics thermal hydraulics

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Assessment of Axial Power Peaking Factors in GHARR-1 LEU Core: A Decadal Simulation Analysis

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World Journal of Nuclear Science and Technology 2024年第1期14卷 72-85页

作者： Emmanuel Kwame Ahiave Emmanuel Ampomah-Amoako Rex Gyeabour Abrefah Mathew Asamoah Department of Mathematics and Statistics Ho Technical University Ho Ghana Department of Nuclear Engineering Graduate School of Nuclear and Allied Sciences University of Ghana Accra Ghana Nuclear Regulatory Authority Accra Ghana National Nuclear Research Institute Accra Ghana

This study aims to thoroughly investigate the axial power peaking factors (PPF) within the low-enriched uranium (LEU) core of the Ghana Research Reactor-1 (GHARR-1). This study uses advanced simulation tools, like the MCNPX code for analysing neutron behavior and the PARET/ANL code for understanding power variations, to get a clearer picture of the reactor’s performance. The analysis covers the initial six years of GHARR-1’s operation and includes projections for its whole 60-year lifespan. We closely observed the patterns of both the highest and average PPFs at 21 axial nodes, with measurements taken every ten years. The findings of this study reveal important patterns in power distribution within the core, which are essential for improving the safety regulations and fuel management techniques of the reactor. We provide a meticulous approach, extensive data, and an analysis of the findings, highlighting the significance of continuous monitoring and analysis for proactive management of nuclear reactors. The findings of this study not only enhance our comprehension of nuclear reactor safety but also carry significant ramifications for sustainable energy progress in Ghana and the wider global context. Nuclear engineering is essential in tackling global concerns, such as the demand for clean and dependable energy sources. Research on optimising nuclear reactors, particularly in terms of safety and efficiency, is crucial for the ongoing advancement and acceptance of nuclear energy.

关键词： GHARR-1 Power Peaking Factor Nuclear Reactor Safety Low Enriched Uranium Core Operational Longevity thermal hydraulics

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