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由于压水堆堆芯对于总功率振荡具有固有的稳定性,且控制和保护系统对堆芯总功率不稳定提供了保护,因此关于堆芯稳定性的讨论仅限于氙致功率空间振荡(即氙稳定性)以及对径向功率分布和轴向功率分布的影响。本文主要通过三维及一维程序进行多种氙瞬态构造,对轴向氙振荡及径向氙振荡进行分析,以验证百万千瓦级压水堆堆芯在氙振荡方面是固有稳定的或可被控制的。计算结果表明,该堆芯在径向氙振荡方面固有稳定,首循环在轴向振荡方面稳定性较平衡循环略差,但可通过堆芯控制系统进行控制,使堆芯处于一个安全状态,燃料设计限值不被突破。
Since the PWR core has inherent stability to the total power oscillations and the control and protection systems provide protection against the total core power instability, the discussion of core stability is limited to xenon-induced power-space oscillations (ie, xenon Stability) and the impact on radial power distribution and axial power distribution. In this paper, three-dimensional and one-dimensional programs are used to conduct a variety of xenon transient constructions. Axial xenon oscillations and radial xenon oscillations are analyzed to verify that an MMW core is inherently stable in xenon oscillation or Controlled. The calculation results show that the core is inherently stable in terms of radial xenon oscillation and the first cycle is slightly worse in stability against axial oscillations than the balanced cycle but can be controlled by the core control system to keep the core in a safe state. The fuel Design limits will not be exceeded.