【摘要】 随着数字化技术的普遍使用,数字化控制系统(DCS)被日益广泛地应用于核电厂的反应堆保护系统,随之而来的是对数字化系统中软件共因故障的关注.纵深防御和多样性策略设计成为解决共因故障的有效措施.为保证核电厂仪控系统4个纵深防御层次的有效性,减少共因故障的发生,以核电厂仪控设计中最重要的设计准则纵深防御和多样性准则为出发点,基于一个安全动作指令完整的信号路径,从纵深防御和多样性的角度分别对信号调理及隔离分配,采集、处理和输出以及驱动信号的优先级处理3个组成部分提出具体的设计需求,指导安全级DCS系统的研发工作,确保开发出的产品能满足核电厂实际应用的特殊需求,从而为核电厂的安全运行提供有力保障.更多还原

【Abstract】 With the universal application of digital technology, digital control systems(DCS) are increasingly used in reactor protection systems for nuclear power plants, and are followed by concerns about common cause failures in software. The defense-in-depth and diversity strategy is an effective measure to solve the common cause failure. In order to ensure the effectiveness of the four defense-in-depth levels of the nuclear power plant instrument control system and reduce the occurrence of common cause failures, this paper takes the defense-in-depth and diversity criteria of the most important design criteria in the instrument control design of nuclear power plants as the starting point. The signal path of the safety function is composed of signal preprocessing and isolation-allocation part, signal collection-processing-output part and priority processing part. Based on defense-in-depth and diversity strategy, the detailed requirements of design is suggested for the above three parts. The requirements are used to guide the research of safety-grade DCS systems, to ensure that the developed products can meet the needs of the actual application of nuclear power plants, and ultimately provide a strong guarantee for the safe operation of nuclear power plants.更多还原