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使用SCALE6.1程序中TSUNAMI-3D-K5模块,建立了10 MW球床高温气冷实验堆HTR-10和球床模块式高温气冷堆HTR-PM的完整三维堆芯模型,并采用其内置的44群协方差矩阵,分析了核数据不确定性对HTR-10及HTR-PM两种不同堆芯有效增值因子(keff)的影响。通过比较不同物质组成、不同堆芯状态下两种堆芯keff对不同核素、不同核反应的敏感性及不确定性,从机理上分析了核数据不确定性对HTR-10及HTR-PM两种不同堆芯keff不确定性贡献的差别。研究结果表明,堆芯尺寸不同导致中子泄漏不同、239Pu和235U物质比例不同及其平均裂变中子反应是造成两种堆芯keff不确定性差别的主要原因。
Using the TSUNAMI-3D-K5 module in the SCALE6.1 program, a complete three-dimensional core model of a 10 MW ball bed HTR-10 and a ball bed modular HTR-PM HTR-PM was established and built with its built-in The 44 covariance matrices were analyzed and the effect of nuclear data uncertainty on the effective value-added keff of HTR-10 and HTR-PM was analyzed. By comparing the sensitivity and uncertainty of two kinds of core keffs to different radionuclides and different nuclear reactions under different composition of materials and different core states, we analyzed the uncertainty of nuclear data on the mechanism of HTR-10 and HTR-PM two The difference between the contributions of different core keff uncertainties. The results show that different core sizes lead to different neutron leakage, and the different ratio of 239Pu and 235U materials and their average fission neutron reaction are the main reasons for the difference of keff uncertainty between the two cores.