关键词: 故障-安全, 本质安全, 安全状态

Abstract: This paper gives the definition of fail-safe in several main railway related standards, so as to have a deep understanding of fail-safe. At the same time, it also briefly gives the key requirements of realizing fail-safe in several standards as a comparison; In order to deepen the understanding of the concept of fail-safe, some concepts of inherent safety and fail related are given. As the application of fail-safe concept, this paper puts forward the matters needing attention and the factors to be considered in the safety state identification. Finally, from the perspective of the whole system safety, on the basis of considering human factors, the principle of risk reduction is given.

Key words: fail-safe, inherent safety, safe state