S.R. CLC/TR 50451:2007
Withdrawn
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RAILWAY APPLICATIONS - SYSTEMATIC ALLOCATION OF SAFETY INTEGRITY REQUIREMENTS
Hardcopy , PDF
14-11-2018
English
22-06-2007
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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Withdrawn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 |
| ISO/IEC 15026:1998 | Information technology System and software integrity levels |
| R009-001 : 1997 | RAILWAY APPLICATIONS COMMUNICATION, SIGNALLING AND PROCESSING SYSTEMS HAZARDOUS FAILURE RATES AND SAFETY INTEGRITY LEVELS (SIL) |
| EN 50128:2011/AC:2014 | RAILWAY APPLICATIONS - COMMUNICATION, SIGNALLING AND PROCESSING SYSTEMS - SOFTWARE FOR RAILWAY CONTROL AND PROTECTION SYSTEMS |
| ISA 84.01 : 1996 | APPLICATION OF SAFETY INSTRUMENTED SYSTEMS FOR THE PROCESS INDUSTRIES |
| EN 50129 : 2003 COR 2010 | RAILWAY APPLICATIONS - COMMUNICATION, SIGNALLING AND PROCESSING SYSTEMS - SAFETY RELATED ELECTRONIC SYSTEMS FOR SIGNALLING |
| EN 50126-1:2017 | Railway Applications - The Specification and Demonstration of Reliability, Availability, Maintainability and Safety (RAMS) - Part 1: Generic RAMS Process |
| EN 50121-5:2017 | Railway applications - Electromagnetic compatibility - Part 5: Emission and immunity of fixed power supply installations and apparatus |
| DEFSTAN 00-56/1(1991) : 1991 | HAZARD ANALYSIS AND SAFETY CLASSIFICATION OF THE COMPUTER AND PROGRAMMABLE ELECTRONIC SYSTEM ELEMENTS OF DEFENCE EQUIPMENT |
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