核反馈对并联双通道自然循环系统流动不稳定性的影响  

Effect of Neutronic Feedback on Flow Instability of Parallel Double-Channel Natural Circulation System

作　　者：周铃岚[1,2] 张虹[2] 黄善仿[1] 

机构地区：[1]清华大学工程物理系,北京100084 [2]中国核动力研究设计院核反应堆系统设计技术重点实验室,四川成都610041

出　　处：《原子能科学技术》2013年第4期557-563,共7页Atomic Energy Science and Technology

摘　　要：将热工水力系统分析程序RELAP5与三维物理瞬态输运程序TDOT-T采用并行方式耦合,对并联双通道自然循环系统内核热耦合不稳定性进行分析,得到系统的不稳定边界。分别以燃料时间常数差异较大的板型元件及棒型元件为对象,讨论了核反馈对系统稳定性的影响。对于板型元件,核反馈作用对低含汽率区的第1类密度波振荡(DWO)有明显的抑制作用,而对高含汽率区的第2类DWO基本无影响。对于棒型元件,计算分析结果表明核反馈对系统稳定性几乎无影响。The thermal-hydraulic system code RELAP5 was coupled with the TDOT-T 3D neutron kinetic code by parallel virtual machine （PVM）. A parallel double-channel natural circulation boiling system was built by the coupled code and the instability boundary of the system was obtained. Two types of fuel with different geometries （flat- plate-type fuel and pin-type fuel） were used in the analysis respectively, and the influ- ences of neutronic feedback on density wave instability were analyzed. For the flat-plate- type fuel system, it is found that the type 1 density wave oscillation （DWO） is suppressed by neutronic feedback significantly but the effect of neutronic feedback on type 2 DWO is weak. For the pin-type fuelsystem, the result shows that the effect of neutronic feedback on instability boundary of the system could be ignored.

关 键 词：核反馈 自然循环系统 流动不稳定 RELAP5 TDOT-T 

分 类 号：TK124[动力工程及工程热物理—工程热物理]