Safety Analysis - Quad Log - Engineering Specialized In Critical SystemsThe safety of a system is defined by CENELEC standard as the INEXISTENCE OF UNACCEPTABLE RISKS. In this way, the assurance of safety may only be obtained through the application of analyses that evaluate the accident risks, the hazards which may provoke these accidents and the assurance that the existing risks are acceptable. An analysis shall consider the tolerated levels of risks within the application in which the system is inserted, based on standards established by national and international regulation authorities. When there aren’t specifying standards, the acceptable levels shall be defined by the criteria specified by systems operators or analysts. The analyses shall cover the system thoroughly, involving hardware, software and integration parts, as well as its interface with other systems. The natural deployment of the activities are the hazard analyses beginning in the system level and evolving to subsystems, interfaces and operational and maintenance risk conditions. On a later level, there are the hardware failure mode effects and criticality analysis (FMECA), the multiple failures analysis by fault tree analysis (FTA), the software safety analyses, the analysis of the integration between hardware and software, the analyses of interfaces with other systems, the mathematical modeling for safety rates evaluation and the consolidation of the evaluations on the adequacy of the system to the required safety levels. The final result of an analysis is the detailed demonstration, step by step, of the safety studies, the identification of the problems found, the recommendations for improvements, the solutions found by the designers and the final safety evaluation by the analysts. Safety Analysis
|