先进聚合物可燃毒物燃耗特性分析

针对当前新提出的先进聚合物材料(PACS),分析聚合物可燃毒物的材料特性与慢化特性,基于秦山核电厂与Crystal River Three两类堆型燃料组件,对比分析采用不同类型可燃毒物材料时组件的燃耗特性。结果表明:聚合物材料的慢化特性随含氢量呈线性变化关系,调节聚合物分子组成可以改变毒物的燃耗特性。相对传统的可燃毒物材料,先进聚合物可燃毒物体现了良好的毒物特性,全寿期具有更低的局部功率峰,在燃耗初期PACS聚合物可燃毒物有较低的初始k_(inf)值,而在燃耗后期释放高于1%的k_(inf)值,可燃吸收体核素B-10消耗更加充分,且具有较大的热通量,可提高热中子利用率,并促进裂变核素Pu的消耗。

Analysis for Burnup Characteristics of Advanced Polymeric Burnable Poison

In allusion to the current of new advanced polymer materials (PACS), material properties and moderator characteristics of the polymeric burnable poison were analyzed.Burnup characteristics of different types of burnable poison materials were analyzed based on two types of fuel assemblies of Qinshan NPP and the Crystal River Three NPP.The results show that moderator properties of the polymer material has linear relationship with the hydrogen content, and the polymer molecules can be adjusted to change the characteristics of poisons.Relative to traditional burnable poison materials, advanced polymeric burnable poison shows good burnup characteristics, which has a lower local power peak in the whole life cycle.Polymers PACS has lower initial kinf value in BOC, which release higher kinf value than 1% in EOC, and burnable absorber nuclide B-10 consumes more sufficiently.Polymers PACS has a large heat flux, it also can improve the utilization of thermal neutron and promote the consumption of fission nuclide Pu.