双富集度堆芯燃料管理方案对中子学参数影响研究

Effects of Dual-Enrichment Fuel Management on Neutronic Data in Reactor Core

采用SCIENCE V2程序包研究双富集度堆芯方案对中子学参数的影响。在不改变新组件布局的情况下,通过调整新组件富集度和可燃毒物数量实现64组新组件平衡循环燃料管理方案,新组件富集度选为4.45%和4.95%,考虑了1:0、2:1、1:1、1:2、0:1等5种典型富集度比例。研究了不同比例双富集度方案对堆芯通用核数据和关键中子学参数、特定事故中子学参数等堆芯特性的影响。结果表明,在新组件数目固定的情况下,双富集度堆芯的循环长度依然具备很大的灵活性;不同比例双富集度方案不影响通用核数据和关键中子学参数及特定事故中子学参数的安全分析限值。

This paper discusses the effects of different proportions of fresh fuel assemblies number on neutronic data with SCIENCE V2 package. A fixed loading parttern with 64 fresh fuel assemblies is applied in order to reach a equilibrium state by adjustment of enrichment and Gadolinium rod numbers in fresh fuel assemblies. There are five typical proportion of fresh fuel assemblies with the enrichments of 4.45% and 4.95%, respectively. The effects of different proportion on the generic nuclear data, key neutronic parameters and specific accidental neutronic data are provided. The results show a high flexibility of cycle length. The propotion of fresh fuel assemblies of different enrichements has no effect on the limits of general nuclear data, key neutronic parameters and specific accidental neutronic data.