一、安全性基本概念Safety Related Definitions1、系统安全性基本定义System Safety Definition——ARP4754A1.危害(Hazard)引起意外事件,造成事故损失或损伤的危险的内因和外因的环境条件.condition resulting from failures, external events, errors, or combinations thereof where safety is affected.2.事故(Mishap)意外事件或一系列事件导致死亡、伤害、职业病疾病、伤害或损失的设备或财产,或者破坏环境(mil-std-882 e).An event or series of events resulting in unintentional death, injury,occupational illness, damage to or loss of equipment or property, or damage to the environment.For the purposes of this Standard, the term "mishap" includes negative environmental impacts from planned events.(mil-std-882 e)3.风险(Risk)事故形式、结果状态、影响程度和发生概率的描述The combination of the frequency (probability) of an occurrence and its associated level of severity.