Study on Coupled Neutronic and Thermodynamic Instabilities in a Double Rectangular Channel Natural Circulation System under Rolling Motion
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摘要: 将海洋条件热工水力分析程序RELAP5/MC与三维物理瞬态输运程序TDOT-T采用并行方式耦合,对摇摆条件下自然循环矩形双通道系统核热耦合不稳定性进行计算分析。结果表明,系统存在同相和异相2种振荡模式,分别由摇摆运动和密度波振荡(DWO)引起。核反馈对第1类DWO和两相区的同相振荡有抑制作用,但对第2类DWO和单相区的同相振荡几乎没有影响。基于非线性理论对计算结果进行分析,发现耦合核反馈后系统非线性增强,由于摇摆导致系统流量波动与DWO叠加,其现象非常复杂,摇摆条件下的核热耦合不稳定性会出现非线性振子耦合中的同步化与混沌现象。
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关键词:
- 摇摆 /
- 自然循环 /
- 核热耦合不稳定 /
- R5MC/TDOT-T
Abstract: The ocean condition thermal-hydraulic analysis code RELAP5/MC is coupled with a 3D neutron transport code TDOT-T by Parallel Virtual Machine（PVM） and coupled neutronic and thermodynamic instabilities in a double parallel channel natural circulation system under rolling motion have been studied.Results indicate that the system has two oscillation modes: the in-phase oscillation caused by rolling motion and the out-of-phase oscillation caused by DWO.The neutronic feedback stabilizes the system in type 1 DWO region and suppresses the in-phase oscillation in two-phase region,but has little effect on the type 2 DWO and the in-phase oscillation in single-phase region.The calculated results have been analyzed based on the nonlinear theory and it is found that the nonlinear of system is enhanced with nuclear feedback.As the result of the system flow oscillation caused by the rolling motion superimposes with the DWO,and this extremely complicated phenomenon includes the synchronization and chaotic phenomena in the coupling of nonlinear oscillators. -
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