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针对中国先进研究堆(CARR)正常运行强迫循环工况和自然循环工况下堆芯内冷却剂流动方向相反的特点,开发了堆芯流量分配计算程序。程序针对这两种运行工况进行了全堆芯的数值模拟,得出堆芯流量分配计算结果和非对称冷却条件下板状燃料元件的温度场。计算发现两种工况下堆芯内各通道的流量份额变化不大,表明流量分配主要取决于通道几何形状和尺寸,基本可以忽略功率分布不均的影响。
In view of the characteristics of forced circulation of normal operation of China National Advanced Research Reactor (CARR) and the direction of coolant flow in the core under natural circulation conditions, a core flow distribution calculation program was developed. The program has carried on the whole core numerical simulation to these two kinds of operating conditions, and has obtained the calculation result of the core flow rate and the temperature field of the plate-shaped fuel element under the asymmetric cooling condition. The calculation shows that the flow share of each channel in the core does not change much under both conditions, indicating that the flow distribution mainly depends on the channel geometry and size, and can basically ignore the influence of uneven power distribution.