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球床高温气冷堆球流运动存在由于随机扰动引起的混流现象,它对于功率分布等堆芯关键参数有影响。通过开发工具、定量分析,发现其影响较小,而多次通过的燃料循环方式有效降低堆芯关键参数由于燃料球随机运动而造成的计算不确定性。球流混流使得堆芯不同区域内不同价值的核燃料球实现交混,对比分析堆芯各区域核密度及燃料球燃耗深度变化结果表明:混流效应使堆芯各区域核密度发生变化,但球床式高温气冷堆堆芯燃料球分布和运动使得堆芯各区域核密度差异不大,而多次通过使此差异更小;因此混流效应使得各区域核密度变化很小,进而对堆芯关键参数影响很小。
Ball bed high temperature gas-cooled pile ball flow movement due to random turbulence caused by mixed flow phenomenon, it has important influence on core parameters such as power distribution. Through the development of tools, quantitative analysis found that the impact of smaller, and repeatedly through the fuel cycle effectively reduce the key parameters of the core due to the random movement of fuel balls caused by the calculation of uncertainty. The ball flow mixing makes the different values of nuclear fuel balls in different regions of the reactor cross-mixed. The comparative analysis of the nuclear density and the fuel consumption depth changes in the core region shows that the mixing density changes the nuclear density in each region of the core. The distribution and movement of core fuel balls in a CGRR make the difference of nuclear density in each region of the core not much, but the difference is smaller in multiple passes; therefore, the mixing effect makes the variation of nuclear density in each region very small, The key parameters have little effect.