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RAILWAY APPLICATIONS - SYSTEMATIC ALLOCATION OF SAFETY INTEGRITY REQUIREMENTS
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Available format(s): Hardcopy, PDF
Withdrawn date: 14-11-2018
Language(s): English
Published date: 22-06-2007
Publisher: National Standards Authority of Ireland
Executive summaryIntroduction1 Scope2 References 2.1 Normative references 2.2 Informative references3 Definitions4 Symbols and abbreviations5 Safety Integrity Levels allocation framework 5.1 Prerequisites 5.2 Overview of the methodology 5.3 Definition of Safety Integrity Levels 5.4 Qualitative vs quantitative methods 5.4.1 Qualitative assessment 5.4.2 Quantitative assessment 5.5 EN 50126-1 lifecycle context6 System definition7 Hazard identification 7.1 General principles 7.2 Empirical hazard identification methods 7.3 Creative hazard identification methods 7.4 Hazard 7.5 Existing hazard lists8 Risk analysis 8.1 Risk tolerability 8.2 Determination of Tolerable Hazard Rate 8.2.1 Qualitative risk analysis 8.2.2 Quantitative risk analysis 8.2.3 GAMAB and similar approaches 8.2.4 The MEM approach 8.2.5 Other approaches9 System design analysis 9.1 Apportionment of safety integrity requirements to functions 9.1.1 Physical independence 9.1.2 Functional independence 9.1.3 Process independence 9.2 Use of SIL tables 9.3 Identification and treatment of new hazards arising from design 9.4 Determination of function and subsystem SIL 9.5 Determination of safety integrity requirements for system elementsAnnex A - Single-line signalling system exampleAnnex B - Level crossing exampleAnnex C - Comparison of demand and continuous modeAnnex D - Frequently asked questions
Defines a method to determine the required Safety Integrity Level of railway signalling equipment taking in consideration: - the operational conditions of the railway, and - the architecture of the signalling system.
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