秦二厂2号机组氙振荡抑制方法研究

Study on Preventing Xenon Oscillation of Unit 2 of QinshanⅡ

氙振荡是大型热中子反应堆不可忽视的问题,剧烈的氙振荡给轴向功率控制带来严峻的挑战。本文通过对秦二厂2号机组的氙振荡进行研究分析,发现振荡发散和收敛规律,即在氙振荡过程中,若动棒操作引起轴向功率偏差ΔI变化与当前ΔI的变化趋势相反,可以有效地抑制氙振荡,否则将加剧氙振荡。并以秦二厂3号机组的氙振荡中衰减和加剧过程进行验证该规律。最后,对氙振荡的抑制方法提出几点合理建议,为机组的安全稳定运行提供了重要保障。

Xenon oscillation is a problem that cannot be ignored in large thermal neutron reactors.Serious xenon oscillation brings sever challenges for axial power controlling.Through analyzing xenon oscillation of Unit 2 of Qinshan II,the oscillation divergent and convergent law is found.In the process of xenon oscillation,if moving the control rod,which leads to the axial power deviationΔI changing opposite to the current trend,can effectively prevent xenon oscillation.On the contrary,it may exacerbate xenon oscillation.Then the law is verified by xenon oscillation attenuation and intensification processes of Unit 3 of Qinshan II.Finally,some reasonable suggestions for preventing xenon oscillations are put forward,which provides important guarantee for the safe and stable operation of the unit.