【作者】 许依凡； 彭敏俊； 夏庚磊；

【Author】 XU Yi-fan;PENG Ming-jun;XIA Geng-lei;Harbin Engineering University;

【机构】 哈尔滨工程大学核科学与技术学院；

【摘要】 敏感性分析对确定影响系统功能的关键参数有着重要作用。在进行核动力系统运行特性的分析时,敏感性分析的结果可以筛选出影响系统行为和安全特性的关键参数,减少热工水力仿真计算量,并为后续系统运行优化提供帮助。作为一种高效、简单的敏感性分析方法,局部敏感性分析是最常见的敏感性分析方法,但是这种方法无法考虑参数间相互作用对输出参数的影响。全局敏感性分析方法(Global Sensitivity Analysis, GSA)旨在通过使用不确定性范围内输入变量的不同组合来量化每个输入参数的贡献度。由于全局敏感性分析方法考虑了输入变量的全局影响性,其计算结果相对于局部敏感性分析是更加可靠的。本文利用RELAP5分析程序,以此开展基于Sobol法的全局敏感性分析,识别对一体化压水堆(the Integral-type Pressurized Water Reactor, IPWR)直流蒸汽发生器(OTSG)在低功率下运行稳定性有显著影响的关键参数,为设计优化与实际运行提供指导。更多还原

【Abstract】 Sensitivity analysis plays an important role in determining the key parameters that affect system functions.When analyzing the operating characteristics of the nuclear power system,the results of the sensitivity analysis can filter out the key parameters that impacts the system’s behavior and safety characteristics,reduce the amount of thermal and hydraulic simulation calculations,and lay the foundation for subsequent system operation optimization.As an efficient and simple sensitivity analysis method,local sensitivity analysis is the most common sensitivity analysis method,but this method cannot consider the influence of the interaction between parameters on the output parameters.Global Sensitivity Analysis(GSA) aims to quantify the contribution of each input parameter by using different combinations of input variables within the uncertainty range.Since the global sensitivity analysis method considers the global influence of input variables,its calculation results are more reliable than local sensitivity analysis.This paper uses the RELAP5 analysis program to carry out a global sensitivity analysis based on the Sobol method and to identify the key parameters that has a significant impact on the operating characteristics of the Integral-type Pressurized Water Reactor(IPWR) once-through steam generator(OTSG).The results will provide guidance for design optimization and actual operation.更多还原