西安脉冲堆燃耗对反应性引入瞬态行为的影响研究

Influence of Depletion on Reactivity Insertion Transients for Xi'an Pulsed Reactor

研究了一种精确模拟反应堆燃耗相关瞬态行为的新方法。基于三维物理热工耦合的堆芯瞬态计算程序,与采用微观燃耗的三维精确燃耗计算程序相耦合,针对西安脉冲堆控制棒移动过程,分析了不同燃耗深度下由于反应性引入的不同形式和大小而引起的堆芯功率和燃料温度等参数的瞬态特性。进行了堆芯脉冲功率响应对反应性引入量的敏感性分析,研究了堆芯动态参数的变化机理。数值结果表明:随着燃耗的加深,脉冲堆芯布置时脉冲功率有减小的趋势,而堆芯稳态布置时脉冲功率明显增大,达到脉冲功率峰值的时间有所提前。

In this paper,a new method is presented to accurately simulate the transient behavior of reactor burnup.The core transient calculation code based on three-dimensional physical and thermal coupling is coupled with the three-dimensional precise micro burnup calculation code.According to the control rod movement process of Xi'an Pulsed Reactor(XAPR),the transient characteristics of different parameters such as core power and fuel temperature due to the different form and magnitude of reactivity insertion at different burnup depth are analyzed.The sensitivity of core pulse power response to reactivity insertion is analyzed,and the change mechanism of core dynamic parameters is studied.The numerical results show that with the burnup of nuclear fuel,the peak pulse power tends to decrease when the core is arranged with pulse state,while the peak pulse power increases obviously with the steady state core arrangement,and the time to reach the peak pulse power is advanced.