数字化反应堆保护系统软件V&V危害分析技术研究

Research on V&V Hazard Analysis Technology of Digital Reactor Protection System Software

反应堆保护系统采用数字化技术,其软件的安全性与可靠性需要重点关注。在保护系统软件生命周期各阶段验证和确认(V&V)过程中,对软件进行危害分析,以检查、分析和确定软件可能存在的危害、危害可能造成的事故以及可能的影响和安全控制措施,具有非常重要的意义。危害分析通常综合采用初步危害分析表、初步危害分析、事件树分析、失效模式及影响分析、故障树分析、概率风险评估等技术。本文结合某在建实验堆工程项目数字化保护系统实践,研究这些危害分析技术的使用方法。结果表明,危害分析技术的综合使用可有效缓解或防止软件造成系统危害的风险,提高保护系统的软件安全性。

The safety and reliability of digital reactor protection system software need to be focused.In the verification and validation(V&V)process of each stage of software life cycle of protection system,it is of great significance to carry out hazard analysis on software to check,analyze and determine the possible hazards of software,the accidents caused by hazards,the possible impacts and safety control measures.Generally,technologies such as preliminary hazard analysis table,preliminary hazard analysis,event tree analysis,failure mode and effect analysis,fault tree analysis and probabilistic risk assessment were adopted.Combined with the practice of digital protection system in an experimental reactor project,the application methods of these hazard analysis technologies were explained.The results show that the comprehensive use of hazard analysis technology can effectively alleviate or prevent the risk of system hazards caused by software and the software safety of protection system is improved.