Improvement of power supply security is of paramount importance to sustain human activities. Technical and engineering failures of power grid system have been analyzed to evaluate power system reliability hitherto. However, after Fukushima nuclear accident, the sudden electricity supply disruption particularly associated with nuclear energy utilization brings upon a new risk of electricity supply security arising from societal issues, or nuclear vulnerability. As such, a methodology of quantifying nuclear vulnerability is firstly established under varying both the magnitude and time instant of sudden stoppage of nuclear power operation. Through the nuclear vulnerability analysis, a new electricity supply security index dedicated for nuclear power utilization, named System Interruption Nuclear Vulnerability Index (SINVI) is developed. SINVI could be used to predict the risk of electricity supply disruption arising from the sudden stoppage of nuclear power operation corresponding to the different capacity combination of various energy sources. Finally, the widely proposed dimensions of energy security for undisturbed electricity supply – diversification and redundancy – are incorporated with nuclear vulnerability to design the more secured power system taking into account the risk of nuclear energy utilization. The established algorithm can be readily implemented in any other electricity grid network including nuclear power technology.

改善电源安全对维持人类活动至关重要。迄今为止，已经分析了电网系统的技术和工程故障，以评估电力系统的可靠性。然而，在福岛核事故之后，突然的电力供应中断，特别是与核能利用相关的电力供应，带来了由社会问题或核脆弱性引起的电力供应安全的新风险。这样，首先在改变核电运行突然停止的幅度和时刻的同时建立了量化核脆弱性的方法。通过核脆弱性分析，开发了专门用于核电的新电力供应安全性指标，称为系统中断核脆弱性指标（SINVI）。SINVI可用于预测由于各种能源的不同容量组合而导致的核电运行突然停止而引起的电力供应中断的风险。最后，将广泛提议的不受干扰的电力供应的能源安全性（多样化和冗余性）与核脆弱性相结合，以考虑核能利用的风险来设计更安全的电力系统。所建立的算法可以在包括核电技术在内的任何其他电网网络中轻松实现。广泛提议的用于不受干扰的电力供应的能源安全性（多样化和冗余性）与核脆弱性相结合，以考虑核能利用的风险来设计更安全的电力系统。所建立的算法可以在包括核电技术在内的任何其他电网中轻松实现。广泛提议的用于不受干扰的电力供应的能源安全性（多样化和冗余性）与核脆弱性相结合，以考虑到核能利用的风险来设计更安全的电力系统。所建立的算法可以在包括核电技术在内的任何其他电网中轻松实现。