球床高温气冷堆物理特性的计算机模拟

The Computer Simulation of the Physics Characters of Pebble Bed Reactor

为研究球床高温气冷堆的物理特性，研制出了一套完整的计算机模拟方法和相应的物理计算程序系统。该方法的特点是：考虑了包覆颗粒球型燃料元件的双重非均匀性和燃料元件的运动特性；能处理复杂的堆内外燃料管理；考虑了堆芯顶部装料空间；在谱计算中采用了曲率反馈；并能进行物理和热工计算的直接耦合。该方法已用于ＨＴＲ－１０实验堆的物理设计。

In order to research the physics characters of pebble bed HTGR, a complete computer simulation method and a correspondent physical computation program system have been developed. The special features of the method are as follows: the double heterogeneity of a fuel element with coated particles grain structure and the motion behaviour of a fuel bell are considered; the complex fuel manage in pile and out pile can be treated; the top cavity for loading the fuel pebbles is considered; the buckling feedback in the spectral calculation is introduced ; the direct coupling between physics and thermal hydraulics is made. The method and code have been used in HTR-10 physics design.