基于 UHx －H2体系的反应堆堆芯建模及中子注量率计算

摘要

The small self-regulating reactor based on UH x-H2 system is a new reactor and has a well develop-ment potential .In order to build this reactor , neutronics study should be done for the UH x-H2 system.In this paper , we studied hydrogen absorb -discharge circle for uranium bed on PCT test system , than scan the hy-dride by ICT after 50 circles to get uranium hydride filling density distribution .After that , we used repeated ge-ometry structure function to build HPM reactor core mathematics model for criticality calculation , and calculated the energy spectrum and the neutron fluence rate distribution on critical state , the deviation is less than 3%. This result can provide some theoretical consults for HPM design .%基于铀氢体系的微型自控反应堆（ HPM ）是一种新型堆型，具有良好的发展潜力，要建立该堆，需要对铀氢体系的中子学性能进行详尽的研究。论文在PCT测试系统上对铀床内的铀进行吸放氢循环，取50次循环次数后的氢化物做工业CT扫描，获得铀氢化物的填料密度分布，然后利用MCNP程序的重复几何结构功能以及实验得到的参数，建立了HPM堆芯临界计算的数学模型，并计算了堆芯临界状态下的能谱以及中子注量率分布，误差小于3％，为HPM的设计提供理论参考。