秦山三期CANDU堆应用稍浓铀的研究

对秦山三期CANDU堆应用稍浓铀的可行性用DRAGON／DONUON程序做了时均堆芯研究分析确定秦山三期采用稍浓铀的最优富集度为1.125wt％并对使用此富集度稍浓铀的秦山三期CANDU堆做了基于通道年龄模型的瞬时堆芯检验计算结果表明，在使用2．4棒束换料及简单的分2个燃耗区，外内区燃耗比为0.9时，能够满足秦山三期运行执照限制秦山三期CANDU堆使用此富集度燃料的经济效益的初步分析表明，它将使燃耗提高到185GWd／t(U)，每年节省天然铀资源约53吨，减少乏燃料约116吨，节省燃料循环费用约6700万元计算表明，勿需对秦山三期堆芯结构和运行模式做重大改造即可完成天然铀向稍浓铀的过渡。

Study of the Utilization of Slightly enriched Uranium in Qinshan Phase Ⅲ Candu Reactor

The feasibility of application of slightly enriched uranium (SEU) in CANDU reactor of Qinshan Phase III NPP under the time-averaged equilibrium refueling was studied in this paper using the code system DRAGON/DONJON. The optimum enrichment of Qinshan CANDU reactor was determined to be 1.125wt%. The instantaneous SEU reactor core was calculated and inspected based on the patterned channel age model. It is shown that the simple 2 burnup zones, 2/ and 4-bundle-shift refueling scheme will satisfy the license limits of the maximum bundle power and channel power, which are 935KW and 7300KW respectively. It was estimated that using this optimum enrichment SEU in Qinshan Phase III will increase the burnup to 18.5GWd/tU, save 53 tons of natural uranium resource, decrease the spent fuel to be disposed to 116 ton and obtain 8.15M$ benefit annually. The transition from the nature uranium (NU) to the slightly enriched uranium (SEU) can be completed without major modification of the structure of reactor core and operation mode. This strategy has significant practical and economical benefit.