使用均匀混合型燃料组件的压水堆钍-铀增殖循环研究

为提升压水堆燃料利用率，设计了一种包含适量²³²Th和²³³U的均匀混合型燃料组件。对该型燃料组件的核特性分析表明，其具备随燃耗增加k_inf下降更缓慢的特性，有利于堆芯获得更长的循环长度。以岭澳核电厂一号机组为例，对包含均匀混合型含钍燃料组件的堆芯进行了分析，结果表明，当前压水堆中采用均匀混合型含钍燃料组件是可行的，并且具备²³⁵U利用率高、堆芯循环长度长的优势。

Study on PWR Thorium-uranium Breeding Cycle Using Uniformly Mixed Fuel Assembly

In order to improve the utilization rate of PWR nuclear fuel, a kind of uniformly mixed thorium-uranium assemblies which contain suitable quantity of ²³²Th and ²³³U were developed. Neutronics calculation and analysis show that k_inf of the new assemblies decreases with the increase of burnup slowly. This property is very good for extending reactor core cycle lifetime. Unit 1 of Ling Ao Nuclear Power Plant was chosen as reference core, and thorium-uranium mixed core was formed by feeding thorium assemblies. Through corresponding analysis, the conclusion indicates that uniformly mixed thorium-uranium assemblies suit exiting PWRs and have advantages in ²³⁵U utilization and long cycle lifetime was obtained.