自然循环向强迫循环过渡时的反应性变化

Transitional Reactivity Variation from Natural to Forced Circulation

在Matlab平台中对反应堆及主冷却剂系统建立数学模型,研究自然循环向强迫循环过渡过程中反应性的变化规律。计算结果表明:过渡过程中流量按双曲正切规律变化,时间系数k和流量增加倍数W∞/W0决定了流量的稳定时间和梯度;在反应堆设计中选择合适的k值,可有效改善反应堆周期;尽量降低过渡过程的流量变化速度,可以减小反应性峰值,有助于提高反应堆的安全性。

In order to study the disciplinarian of reactivity variation in the transient state from natural to forced circulation, a calculation model was established for the reactor and primary coolant system based on MATLAB. The calculation results indicate that the coolant flux changes in conformity to hyperbolic tangent curve in the transient state. The coefficient k and flux rising multiple, W∞/W0, determine the flux grads and time for flux to steady. It can effectively improve the minimum reactor period to choose appropriate value of coefficient k in reactor design. And reducing the flux grads of transient state can decrease the peak value of reactivity and increase the security of reactor.