论文部分内容阅读
压水型反应堆堆芯的温度效应对核电厂在瞬态工况下的反应性控制具有重要影响。对压水型反应堆温度效应产生负反应性反馈的机理进行了阐述,并基于点堆中子动力学模型,在MatLab/SimuLink的仿真环境下建立了带有温度反馈环节的瞬态工况堆芯响应仿真模型。根据所建立的仿真模型,考虑反应堆升降功率的瞬态工况,对不同的反应堆温度系数的负反馈影响进行了仿真分析。仿真分析的结果表明,当反应堆需要改变其输出功率对堆芯引入阶跃微小反应性扰动后,由于核燃料和慢化剂的负温度系数作用,使反应堆本身具备内在稳定性,堆芯中子密度变化是趋于稳定的。根据仿真结果,反应堆负温度系数所产生的温度效应对核电厂瞬态工况下反应性控制具有有利的影响。所用的堆芯仿真模型分析方法可以为反应堆堆芯功率控制系统的设计和分析提供参考。
The temperature effect of pressurized water reactor core plays an important role in the reactivity control of nuclear power plant under transient conditions. The mechanism of negative feedback on the temperature effect of pressurized water reactors is described. Based on the neutron kinetic model of point reactor, a transient operating condition core with temperature feedback is established under the simulation environment of MatLab / SimuLink Response simulation model. According to the simulation model established, considering the transient condition of the reactor lift power, the negative feedback effects of different reactor temperature coefficients are simulated and analyzed. The simulation results show that when the reactor needs to change its output power to induce a step-type small reactivity perturbation to the core, the inherent stability of the reactor due to the negative temperature coefficient of the nuclear fuel and moderator, the core neutron density Change is stable. According to the simulation results, the temperature effect caused by the negative temperature coefficient of the reactor has a beneficial effect on the reactivity control of a nuclear power plant under transient conditions. The core simulation model analysis method used can provide a reference for the design and analysis of reactor core power control system.