Abstract
System safety is a discipline of applying engineering and management principles, criteria, and techniques to achieve acceptable or tolerable risk within the constraints of operational effectiveness, suitability, time, and cost throughout all phases of the system life. System safety engineering is the program to identify hazards, and to eliminate hazards or reduce the associated risks when the hazards cannot be eliminated. System safety management involves plans and activities taken to identify hazards; assess and mitigate associated risks; track, control, close, and document risks encountered in the design, development, test, manufacturing, installation, operation and maintenance, and the disposal of systems, subsystems, and equipment. In this paper, the concept and principle of system safety in the transit system is discussed. The paper also introduces the safety standards, safety life-cycle, Safety Integrity Levels (SILs), safety analysis techniques and safety cases etc.
Highlights
System safety is defined in MIL-STD-882E as the application of engineering and management principles, criteria, and techniques to achieve acceptable risk within the constraints of operational effectiveness, suitability, time, and cost throughout all phases of the system life
A typical transit system is a complex public transportation system that consists of guideways, stations, Automatic Train Control (ATC), Power Supply and Distribution, Platform Screen Door, Communications and Vehicles etc
system safety program plans (SSPPs) shall describe in detail a series of tasks and activities required throughout the life cycle of the system that comprises of the safety policy and strategy, scope of plan, planning of the safety activities, safety organization, hazard identification and analysis, risk assessment and acceptance criteria; hazard log management, verification & validation, safety-related deliverables, safety-related interfaces, safety review and audits, safety cases, safety acceptance and approval processes, safety-related procedures and training, constraints and assumptions made in the plan etc., so as to identify, evaluate, eliminate or control hazards, or reduce the associated risk to a level acceptable to the authority having jurisdiction throughout the system life cycle
Summary
System safety is defined in MIL-STD-882E as the application of engineering and management principles, criteria, and techniques to achieve acceptable risk within the constraints of operational effectiveness, suitability, time, and cost throughout all phases of the system life. This means that during the system safety process when we are developing hazard controls, we are performing a cost - benefit analysis.
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