秦凯文, 杨波, 刘义保, et al. Sensitivity and Uncertainty Analysis of Nuclear Data to keff in AP1000 Core Physics Calculation[J]. 2022, (2): 61-67. DOI: 10.16056/j.2096-7705.2022.02.011.
AP1000堆芯物理计算中核数据对keff的敏感性与不确定性分析
摘要
核数据作为反应堆计算的输入参数,其不确定性对堆芯物理计算至关重要。以第 3 代先进压水堆 AP1000首循环零功率堆芯为研究对象,采用 SCALE6.1 程序建立堆芯物理模型,分别计算了反应堆冷态和热态工况下,5种典型硼浓度的堆芯有效增殖因子 k
eff
,并与 AP1000 设计文件基准值进行比对,误差在 50 pcm 以内,验证了模型准确性。随后开展核数据对 k
eff
的敏感性和不确定性分析,结果表明,低能区中
235
U 的平均裂变中子产额、
10
B 的(n
α) 反应截面、共振区中
1
H 的弹性散射截面、快中子区中
238
U 的裂变截面具有较大的敏感性与不确定性,在反应堆物理计算工程中应重点关注。
Abstract
Nuclear data is used as the input parameter of reactor calculation
and its uncertainty is very important to the calculation of core physics. This paper takes first-cycle zero-power reactor core of the third-generation advanced pressurized water reactor AP1000 as the research object
and uses the SCALE6.1 program to establish the core physical model. Under the cold and hot conditions
the core effective multiplication factor k
eff
of five typical boron concentrations was calculated separately. The calculation result is compared with the benchmark value of AP1000 design file
and
the error is within 50pcm
which verifies the accuracy of the model. Subsequently
the sensitivity and uncertainty analysis of nuclear data to k
eff
was carried out. The results showed that the average fission neutron yield of
235
U and the (n
α) reaction cross section of
10
B in the low energy region
the elastic scattering cross section of~1H in the resonance energy region
and the fission cross section of
238
U in fast neutron region has greater sensitivity and uncertainty. They should be focused on in the future reactor physical calculation engineering.