Risk analysis & HA
The Safety requirements must be evaluated in the realization of the Systems, in this context the analyzes that are carried out tend to define the Safety requirements to be associated to a System and the relative level of Safety Integrity ("Safety Integrity Level").
Some methods used to define and verify the security requirements are:
- HAZOP (Hazard and Operability Analysis)
- OSHA (Operating Support Hazard Analysis)
- FMECA (Failure Mode Effect and Criticality Analysis)
- FTA (Fault Tree Analysis)
- ETA (Event Tree Analysis).
The assessment of RAMS (Reliability, Availability, Mantainability, Safety) requirements is used in all systems or railway products projects. Prior to this, the assessment is carried out using qualitative and quantitative methods that have been consolidated over the years:
- FMECA (Failure Mode Effects and Criticality Analysis)
- Failure Tree Analysis
- Reliability Block Diagram
- Markov chains
- RCM (Reliability Centered Maintenance)
- Spare Part Management
- Corrective and Preventive Maintenance Analysis
The applicability of the RAM Analysis as well as the Systems, Software and Hardware also occurs for the "Human Factor", which affects the Security functions.
related to Verification and Validation, CENELEC regulations and sector-specific methodologies.