Reactor Physics study of fast and thermal neutron coupled cores

快热中子耦合堆芯是分布有产生热中子的区域的快堆堆芯，通过改变堆芯布局，阐明了堆芯的核特性。考虑到周围的燃料组件，发展了电池均化宏观截面制备方法，设计了一种新的紧耦合燃料棒燃料组件。利用轻水冷却，在世界上首次实现了高繁殖特性。采用新燃料组件的快堆复合系统倍增时间小于40年。热工水力设计有待进一步研究。

Fast and thermal neutron coupled core is the fast reactor core with distributed regions generating thermal neutrons.The nuclear caracteristics has been clarified by changing core layout. The method of cell- homogenized macroscopic cross section preparation has been developed by taking the surrounding fuel assemblies into considiation.A new fuel assembly of tightly coupled fuel rods was devised. High breeding characteristics is achieved for the first time in the world with light water cooling. Compound system doubling time of the fast reactor with the new fuel assemblies is less than 40 years. Thermal- hydraulic design remains for the future study.