超临界六角形双排燃料组件性能分析

Performance Analysis on the Two-Row Hexagonal Fuel Assembly for Super Critical Water-Cooled Reactor

利用物理-热工水力耦合计算程序系统(MCATHAS)分析2种六角形双排超临界燃料组件,充分考虑了超临界水冷堆(SCWR)中冷却剂、慢化剂轴向温度、密度的剧烈变化和功率分布的相互影响。计算结果表明,双排六角形组件具有均匀慢化和充分慢化性能,文中提出的D6-1型组件在仅采用一种燃料成分、不添加可燃毒物的情形下,其径向功率峰值因子低于1.10。另外,研究表明,由于组件间隙具有较大热周和较小流通面积,需要在实际工程应用中增加隔热涂层以降低组件外盒壁的导热率。

MCATHAS system, which is a code of coupled neutronics/thermal-hydraulics, is used for the calculating of the two two-row hexagonal fuel assemblies. Considering the mutual influence between the axial obvious evolution of density and temperature of the coolant and moderator and the relative power distribution, the results show the two-row hexagonal fuel assemblies keep the balance between uniform moderation and sufficient moderation. The radial power peaking factor of the D6-1 assembly in the paper is less than 1.10 under the condition of using the same enrichment fuel and without the burnable poison. In addition, due to the longer heated perimeter and the litter flow area of the assembly gap region, the conductivity of the assembly box needs to be smaller by adding some adiabatic material.