在求解反应堆三维空间功率分布时,采用改进的节块耦合系数计算公式,并以保持堆芯总泄漏不变为前提,依据几何等效,调整径向边界不同部分的泄漏分配。对国际原子能机构三维基准问题所作的数值计算表明;这种改进型节块法用于大型轻水堆三维分析,是有适当精度而又十分快速的。 In solving the three-dimensional space power distribution of the reactor, an improved calculation formula of joint coupling coefficient was adopted. Based on geometric equivalence, the leakage distribution in different parts of the radial boundary was adjusted based on the premise of keeping the total core leakage unchanged. Numerical calculations of the IAEA’s three-dimensional benchmarks show that this improved nodal method is suitable for three-dimensional analysis of large light water reactors and is reasonably accurate and very fast.