【作者】 赵军； 童节娟； 郭晓明； 刘涛；

【Author】 ZHAO Jun,TONG Jie-jun,GUO Xiao-ming,LIU Tao

【机构】 清华大学核能与新能源技术研究院； 中国核动力研究设计院设计所；

【摘要】 鉴于数字化系统在可靠性、灵活性等方面的优势,多数核电厂,尤其是在建核电厂正在逐步采用数字化仪控系统来替代传统的模拟量仪控系统。核电厂仪控系统可以分为保护系统和控制系统两大类,而后者由于具备反馈、交互等过程,在运行中具备更显著的动态特性。本文以数字化仪控系统中典型的双CPU结构为范例,采用动态流图法(DFM)对其进行模化分析,以探讨DFM方法对数字化仪控系统可靠性评估的适用性,并对将分析结果结合到核电概率厂安全评价(PSA)的方式进行了讨论,有助于更为真实地评估核电厂的安全性。更多还原

【Abstract】 Because of the high reliability and flexibility of Digital instrumentation and control(I&C) systems,the analog I&C systems are upgraded by use of digital ones widely in the nuclear power plants(NPPs),especially in NPPs under construction and consideration currently.The Digital I&C systems in NPPs can be classified into two types including Reactor Protection System and Reactor Control System.Unlike protection system,the operation of Reactor Control System has the dynamic features distinctly which include time sequence,feedback of signal,etc.In this paper,the reliability of typical dual-CPU structure of typical digital system will be evaluated by DFM model to demonstrate the availability of DFM method and find the difficulties in the process of modeling and quantity.Moreover,it also provides an efficient way to incorporate the results into existing PSAs.更多还原