负荷跟踪过程中优化移动棒栅以实现三维功率分布的控制

Optimizing Rod Movements Method to Realize 3-D Power Distribution Control for Load Follow

核反应堆的负荷跟踪问题通常采用一维中子通量模型来处理，但采用一维模型并不总是合适的，尤其是当反应堆的功率控制过程完全采用中子通量的强吸收体——控制棒控制时。本文提出采用三维中子通量模型，并且采用谐波综合法与节块法结合用于负荷跟踪的优化计算，以实现有效的三维功率分布控制。为此，控制棒采用分组调节的策略。从对 200MW核供热堆的计算结果可以看出：由于能够充分利用三维功率控制的优势，这种棒动策略可以较其他动棒方式有较好的跟踪效果，例如使功率峰因子下降约 4％。

The load-following problem in nuclear reactor is traditionally solved by 1-D neutron flux model. It is not always appropriate, especially when control rods, which are strong neutron absorption bodies, maintain the power changing procedure by itself. A 3-D neutron flux model is used to perform a 3-D power distribution control over the whole load-following procedure. To make it effective and improve the calculating performance, the Harmonic synthesis method and Nodal method are combined in the load-following calculation for optimization. For this purpose, the control rods are managed according to the grouping-control strategy. From the calculation results on the 200 MW Heating Reactor, it can be seen that this rod-managing-strategy produces a better control result than other strategies, since it makes full use of the advantages of the 3-D power distribution control. For example, it causes the power peaking-factor to lessen about 4%.