【摘要】 为了定量研究核数据的不确定度对西安脉冲堆k_eff计算结果的影响,利用国际上常用的敏感性和不确定度分析软件TSUNAMI-3D-K6及不同核数据库中的核截面数据,分析计算了西安脉冲堆两种堆芯布置下的k_eff及其不确定度。结果表明:核截面数据的不确定度会导致k_eff的不确定度在0.5%左右,核素235 U的裂变中子产额对k_eff不确定度的贡献最大,西安脉冲堆不同堆型下,由共振自屏计算得到的隐式敏感性系数差异较小,不同堆芯布置下计算得到的k_eff不确定度差异不大。更多还原

【Abstract】 To investigate the uncertainty of nuclear data to k_effcalculation in Xi’an Pulsed Reactor（XAPR）,a widely used TSUNAMI-3D-K6 code is used to study k_effuncertainties with respect to two reactor core arrangements for XAPR.The results indicate that the accuracy of present nuclear cross-section data would bring an uncertainty about 0.5%for k_eff while the number of neutron yield per fission of 235 U contributes most to k_eff uncertainty.The implicit sensitivity coefficients caused by resonance shielding calculation have a little influence on the patterns of XAPR,and different arrangements in XAPR alter local sensitivity coefficients,however it has no effect on the final uncertainty to k_eff.更多还原