钠冷快堆小栅板联箱压降对组件流量分配影响研究  

Effect of Distribution Header Pressure Drop on Flow Distribution of Assembly for Sodium-cooled Fast Reactor

作　　者：林超[1] 高鑫钊 周志伟[1] 余新太 LIN Chao;GAO Xinzhao;ZHOU Zhiwei;YU Xintai(China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《原子能科学技术》2024年第9期1859-1865,共7页Atomic Energy Science and Technology

摘　　要：钠冷快堆堆芯采用大栅板联箱、小栅板联箱和组件的三级流量分配方式,小栅板联箱的压降影响组件的流量分配,进而影响堆芯的安全,因此进行钠冷快堆小栅板联箱压降对组件流量分配影响研究有重要意义。根据小栅板联箱压降造成组件流量分配偏差的机理,提出了理论计算模型和堆芯组件优化设计的方法,并针对中国实验快堆(CEFR)堆芯进行了组件压降的优化设计,通过优化设计降低了CEFR燃料组件流量分配负偏差。结果表明,在进行钠冷快堆堆芯热工水力设计时,需要结合实际堆芯布置分析组件压降设计值的优化方向,并进行敏感性分析,以确定组件的最优设计压降,将小栅板联箱压降对组件流量分配影响降低到最低程度。本文结果可为钠冷快堆堆芯热工水力设计提供参考。China is accelerating the development of sodium-cooled fast reactor technology.For nuclear reactors,whether it is a pressurized water reactor or a fast reactor,core flow distribution is a key concern,which directly determines whether the reactor can operate safely and reliably.Sodium-cooled fast reactor core adopts a three-stage flow distribution method consisting of diagrid,distribution headers and assemblies.Distribution headers are installed on diagrid,and various types of assemblies are installed on distribution headers.Pressure drop of the core is composed of distribution header pressure drop and assembly pressure drop.The distribution header pressure drop itself affects the flow distribution of the assemblies,thereby affecting the safety of the core.Therefore,it is of great significance to study the impact of distribution header pressure drop on the flow distribution of assemblies for the sodium-cooled fast reactors.In order to reduce the flow distribution deviation of assemblies caused by the distribution header pressure drop,it is necessary to carry out a reasonable assembly pressure drop design.Based on the mechanism of flow distribution deviation of assemblies caused by distribution header pressure drop,a theoretical calculation model was proposed,and an optimized design of assembly pressure drop was carried out for the China Experimental Fast Reactor(CEFR)core.Based on the actual layout of CEFR core,the maximum deviation of flow distribution of fuel assemblies was obtained,and the optimization direction of nominal assembly pressure drop was determined,indicating that optimization design of nominal assembly pressure drop should be carried out for the first five rings.After adjusting the nominal pressure drop of the first five rings of assemblies from 250 kPa(the original nominal pressure drop)to 249 kPa,248.5 kPa,and 248 kPa,respectively,the maximum deviation of flow distribution of fuel assemblies firstly decreases from−0.99%to−0.95%,and then increases to−1.02%and−1.08%,which indicates that nom

关 键 词：钠冷快堆 堆芯 小栅板联箱 热工水力 流量分配 

分 类 号：TL333[核科学技术—核技术及应用]