S.R. CLC/TR 50451:2007
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
RAILWAY APPLICATIONS - SYSTEMATIC ALLOCATION OF SAFETY INTEGRITY REQUIREMENTS
Hardcopy , PDF
English
22-06-2007
14-11-2018
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
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.
| DevelopmentNote |
Supersedes I.S. R009-004. (06/2007)
|
| DocumentType |
Standard
|
| Pages |
89
|
| PublisherName |
National Standards Authority of Ireland
|
| Status |
Withdrawn
|
| Standards | Relationship |
| CLC/TR 50451:2007 | Identical |
This standard has been withdrawn and is no longer current. No replacement edition is available.
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