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为改善高温气冷堆控制棒区物理计算精度,采用不连续因子理论修正扩散方程,使用扩散差分法程序C ITAT ION进行求解。对于1/60和1/30扇区堆芯模型,分析了边界条件和均匀化区对不连续因子计算的影响。结果表明,以离散纵标法程序SN 2D求得的精细网格的输运解为基准,在最大误差2%时,用该方法计算得到的有效增殖因子、反应性价值和活性区的中子注量率分布均与参考解相符。采用不同均匀化模型的不连续因子计算,受边界条件的影响都不大。
In order to improve the physical calculation accuracy of control rod zone of HTR, the diffusion equation was modified by the theory of discontinuity factor and solved by diffusion difference method C ITAT ION. For the 1 / 60th and 1 / 30th core models, the influence of boundary conditions and homogenization area on the calculation of discontinuities is analyzed. The results show that the effective propagation factor, reactivity value and neutron of the active region calculated by this method are calculated based on the transport solution of the fine grid obtained by the discrete ordinate method SN 2D. Fluence rate distribution consistent with the reference solution. The calculation of the discontinuity factor using different uniform models is not affected by the boundary conditions.