PD CLC/TR 50451:2007
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Railway applications. Systematic allocation of safety integrity requirements
Hardcopy , PDF
11-30-2018
English
12-31-2010
Executive summary
Introduction
1 Scope
2 References
2.1 Normative references
2.2 Informative references
3 Definitions
4 Symbols and abbreviations
5 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 context
6 System definition
7 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 lists
8 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 approaches
9 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 elements
Annex A - Single-line signalling system example
Annex B - Level crossing example
Annex C - Comparison of demand and continuous mode
Annex D - Frequently asked questions
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