基于定量重要性分析的燃耗链压缩方法

发布时间：2018-06-09 07:05

本文选题：燃耗链 + 燃耗数据库　；参考：《强激光与粒子束》2017年03期

【摘要】：核反应堆物理计算中的燃耗计算需要使用燃耗链,但是评价核数据库所定义的燃耗链对于组件计算以及堆芯微观燃耗计算过于精细,传统的燃耗链压缩方法大都是半经验性的,适用范围和精度有限。提出了一种通过定量评估各核素与各反应道重要性实现压缩燃耗链的方法。重要性分析的数据基础是代表性问题的精细燃耗链计算结果,方法是考察每一个单元压缩操作对中子吸收、中子产出以及目标核素原子核密度的影响。该方法被应用于压水堆组件计算中燃耗链的压缩,随后分别应用精细燃耗链和压缩燃耗链对选取的验证算例进行了计算。结果的对比分析显示,在保证计算精度需求的前提下,该燃耗链压缩方法能够显著降低燃耗链规模,满足节省存储开销和时间的需求。
[Abstract]:Burnup chain is used in nuclear reactor physical calculation, but the burnup chain defined by the evaluation nuclear database is too fine for component calculation and micro-burnup calculation of reactor core. The traditional compressing method of burnup chain is mostly semi-empirical. The scope of application and precision are limited. A method of compressing the burn-up chain by quantitatively evaluating the importance of each nuclide and reaction channel is presented. The data of importance analysis is based on the results of fine burn-up chain calculation of representational problems. The effect of each unit compression operation on neutron absorption, neutron output and nuclear density of target nuclides is investigated. The method is applied to the compression of burn-up chain in PWR assembly calculation, and then the selected verification examples are calculated by using fine burnup chain and compressed burnup chain respectively. The results show that the compressing method can significantly reduce the scale of the burnup chain and meet the requirements of saving storage cost and time on the premise of ensuring the accuracy of the calculation.
【作者单位】：西安交通大学核科学与技术学院;
【基金】：国家自然科学基金项目(11522544)
【分类号】：TL32

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