核电软件需要给出计算结果的不确定性,在此基础上才可有效评价核电的安全性。核数据是核电软件堆芯计算不确定性的重要来源之一,而堆芯宏观参数对核数据的敏感性分析是不确定性分析的重要步骤。以秦山二期堆芯为研究对象,对其临界计算结果开展核数据的敏感性分析。首先采用蒙特卡罗程序建立秦山二期首循环计算模型,然后基于中国核数据中心研制的连续能量截面库CENACEV1.0,采用反复裂变几率法计算有效增殖系数对核数据的敏感性系数。通过整理分析秦山二期冷热态、寿期初中末状态的敏感性系数,梳理出核电软件不确定分析中需要关注的重要核素数据。

Nuclear power software needs to give the uncertainty of calculation results, thus it can effectively evaluate the safety of nuclear power. Nuclear data are important sources of uncertainty in core calculation, and the sensitivity analysis is an important step for the uncertainty analysis of core parameter. The sensitivity analysis of nuclear data is carried out on the critical calculation in Qinshan Ⅱ core. Firstly, Monte Carlo procedures are used for the establishment of Qinshan Ⅱ’s first cycle model, then the sensitivity coefficient of nuclear data is calculated with Iterated Fission Probability method(IFP) based on continuous energy cross section library CENACE V1.0 developed by Chinese nuclear data center. By the analysis of the sensitivity coefficient with different temperature and different burnup, the important nuclear data to be concerned in the uncertainty analysis of nuclear power software would be found.