In pebble-bed high temperature gas-cooled reactors (HTGRs), the outside graphite reflector generally contains void regions, including the boring channels for control rods, absorber balls and coolant flow. Deterministic reactor physics calculation of HTGR is usually based on regular geometries, which requires pre-homogenization to the materials with void regions. However, the volume-weighted homogenization to the HTGR reflector can greatly overestimate the k_eff, due to the neutron streaming effect in the reflector channels. This paper proposes a convenient method of correcting the neutron streaming effect in the HTGR reflector, by adjusting the homogenized transport cross sections based on preservation of the neutron transmission probabilities. The proposed method has been implemented in the PANGU code for pebble-bed HTGR physics analysis and fuel cycle simulations. Numerical results suggest that the proposed method can effectively reduce the discrepancy in the homogenization of the HTGR reflector.

在球床高温气冷反应堆 (HTGR) 中，外部石墨反射器通常包含空隙区域，包括用于控制棒、吸收球和冷却剂流的钻孔通道。HTGR 的确定性反应堆物理计算通常基于规则几何形状，这需要对具有空隙区域的材料进行预均化。然而，对 HTGR 反射器的体积加权均匀化会大大高估 k _eff，由于反射器通道中的中子流效应。本文提出了一种校正 HTGR 反射器中子流效应的简便方法，通过在保留中子传输概率的基础上调整均匀传输截面。所提出的方法已在用于球床高温气冷堆物理分析和燃料循环模拟的 PANGU 代码中实现。数值结果表明，所提出的方法可以有效地减少HTGR反射器均匀化的差异。