In order to improve the utilization rate of PWR nuclear fuel , a kind of uniformly mixed thorium-uranium assemblies which contain suitable quantity of 232 Th and 233 U were developed .Neutronics calculation and analysis show that kinf 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 235 U utilization and long cycle lifetime was obtained .%为提升压水堆燃料利用率，设计了一种包含适量232 T h和233 U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 kinf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235 U利用率高、堆芯循环长度长的优势。
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