耦合核反馈并联通道异相振荡研究

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Research on Out-of-Phase Oscillation in a Nuclear-Coupled Parallel Double-Channel Boiling System

1. Department of Engineering Physics, Tsinghua University, Beijing, 100084, China;
2. Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610041, China

摘要: 将热工-水力系统分析程序(RELAP5)与细网三维物理瞬态输运程序(TDOT-T)采用并行方式耦合,并对并联双通道系统进行建模,得到系统的不稳定边界图;对耦合核反馈的双管并联通道异相振荡进行研究;重点讨论轴向功率分布及核反馈对并联通道异相振荡的影响。研究发现,轴向功率峰在加热段上游时,系统存在第Ⅰ类和第Ⅱ类密度波2个不稳定区域,在燃料时间常数很小的情况下,核反馈对2类密度波不稳定性都有抑制作用。
- RELAP5/TDOT-T /
- 并联通道 /
- 异相振荡
Abstract: In this paper,the RELAP5 thermal-hydraulic system code is coupled with the TDOT-T 3D neutron kinetic code by PVM（Parallel Virtual Machine）.A parallel double-channel boiling system is built by the coupled code and the instability boundary of out-of-phase oscillation in the system is obtained.The effects of axis power distribution and neutron feedback on the out-of-phase oscillation are analyzed in details.It is found that there are type-I and type-II density wave oscillation regions when the axial power peak is located at upstream of the heating section.At relatively lower values of fuel time constant,the neutron feedback always delays both types of density wave oscillations.
- RELAP5/TDOT-T /
- Parallel channels /
- Out-of-phase oscillation