基于截面偏差的堆芯功率分布重构方法研究

Research of Core Power Distribution Reconstruction Method Based on Cross-section Deviation

提出了一种将功率偏差归结为组件等效截面偏差的堆芯功率分布重构方法。通过对影响功率分布的各种因素进行分析,引入组件截面偏差从而构造出功率偏差,然后将功率重构转化为一个多极值优化搜索问题。采用全局搜索能力较强的特征统计算法(CSA)对影响因素进行了搜索和复现。以秦山二期核电站2号机组为例,选取氙毒波动和慢化剂温度场变化两个因素进行了测试。结果表明,对于所构造的例题,本方法可成功搜索出影响因素,重构后最大功率偏差从5%降低至0.1%,初步验证了本方法的可行性。

A core power distribution reconstruction method which attributes power deviation to assembly equivalence cross-section deviation was proposed.Through the analysis of the various factors that affect the core power distribution and modeling,the crosssection deviation and construct power deviation were introduced.Then,the original problem as an optimizing search problem was regarded.At last,the factors by characteristic statistic algorithm（CSA）were searched and replicated.To verify the feasibility of this method,xenon poison and moderator temperature field were chosen as factors in unit 2reactor of Qinshan No.2Nuclear Power Plant.The results show that this method is suitable for power distribution reconstruction preliminarily.