浮动核电站仪控系统纵深防御与多样性设计分析

Defense-in-depth and Diversity Design Analysis of the I&C System in the Floating Nuclear Power Plant

随着核电技术的发展,数字化控制系统在核电站的广泛应用带来的潜在共因故障可能导致系统失效。浮动核电站仪控系统主要由满足独立性要求的安全级和非安全级控制系统组成,通过控制系统防御层、紧急停堆系统防御层、专设安全设施驱动系统防御层以及监测和显示系统防御层的纵深防御设计,形成针对核事故的多层次防御,各个防御层通过实体分隔和电气隔离实现功能独立,并利用多样性设计方法,有效提高系统应对共因故障的能力,从而保证设备和人员的安全。

With the development of nuclear power technology,the widespread application of the digital control system in nuclear power plants may lead to potential common cause failures of the system.The I&C system of the floating nuclear power plant is mainly composed of safety level and non safety level control systems that meet the independence requirements.It forms a multi-level defense against nuclear accidents through the defense-in-depth design of the defense layers of the control system,emergency shutdown system,special safety facility driven system,and monitoring and display system.Each defense layer realizes functional independence through physical separation and electrical isolation,and uses diversity design methods to effectively improve the ability of the system to deal with common cause failures,so as to ensure the safety of equipment and personnel.