【作者】 张瑞； 郑友琦； 牛江； 张一帆； 陶昱姗；

【Author】 ZHANG Rui;ZHENG Youqi;NIU Jiang;ZHANG Yifan;TAO Yushan;Xi’an Jiaotong University;Nuclear Power Institute of China;

【机构】 西安交通大学； 中国核动力研究设计院；

【摘要】 工程制造参数的实际值与名义值往往会存在偏差,其不确定度会随着计算传递使得反应堆物理计算结果产生不确定度。本文使用统计学抽样的方法,对工程制造参数不确定度导致的反应堆临界物理实验有效增殖系数(k_eff)的计算不确定度进行了计算分析。计算程序采用西安交大自主开发的堆芯物理计算程序SARAX,建立了Dakota/SARAX不确定度分析框架。以某微型反应堆临界装置为对象,分析了包括燃料富集度、燃料密度、反射层杂质等在内的工程制造参数导致的k_eff的不确定度。研究发现,在制造公差的范围内,反射层杂质含量的影响最大,达到138 pcm,控制棒杂质、芯块直径等对结果的影响可以忽略不计。各类工程制造参数造成的总的不确定度为157 pcm。更多还原

【Abstract】 The actual value of engineering manufacturing parameters often deviates from the nominal value,and its uncertainty will transfer with the calculation,resulting in uncertainty in the physical calculation results of the reactor.In this paper,the statistical sampling method is used to calculate and analyze the calculation uncertainty of the k_eff of critical devices caused by the uncertainty of engineering manufacturing parameters.The calculation program adopts the core physics calculation program SARAX independently developed by Xi’an Jiaotong University,and establishes the Dakota/SARAX uncertainty analysis framework.Taking a micro reactor critical device as an example,the uncertainty of k_eff caused by engineering manufacturing parameters,including fuel enrichment,fuel density,reflector impurities,etc.,was analyzed.It is found that within the manufacturing tolerance range,the influence of impurity mass fraction in the reflector is the largest,reaching 138 pcm,and the influence of control rod impurities and pellet diameter on the results can be ignored.The total uncertainty caused by various engineering manufacturing parameters is 157 pcm.更多还原