船用一体化反应堆自然循环过渡过程控制优化研究

Study on Control and Optimization for Natural Circulation Transition Process of Integrated Marine Reactor

为了研究反应堆强迫循环向自然循环转换过程中功率自动调节方案,利用建立的数学模型对某型船用一体化反应堆自然循环过渡过程进行了理论计算。结果表明:过渡过程中,由于一体化压水堆自然循环工况下反应堆进、出口温度的滞后效应明显,并且冷却剂温度在功率自动调节模型中的权重大,使得反应堆进、出口温度测量点的位置对重要参数的峰值产生较大影响,反应堆进、出口温度测量点设置越接近反应堆活性区,则过渡过程中重要参数的波动峰值越小,过渡过程需要的时间越短,控制过程更优。

In order to study the reactor power self-regulation schemes during transition process from forced circulation to natural circulation, mathematic models were established to simulate natural circulation transition process for an integrated marine reactor. The results show that during transition process, the core inlet and outlet coolant temperatures have a strongly delayed effect under natural circulation conditions, and the coolant temperature weights are high in the nuclear power self-regulation model. Thus the measuring point positions of the core inlet and outlet coolant temperature have a significant influence on the peak value of key parameters. The closer to the core the meas uring point positions of core inlet and outlet coolant temperature are, the smaller the peak values of key parameters are during the transition process, the shorter the transition process time is and the control process has a better effect.