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eLibrary > 24/30437805 DC BS IEC 62278-1 Railway applications - Specification and demonstration of reliability; availability; maintainability and safety (RAMS) - Part 1: Generic RAMS process >

24/30437805 DC BS IEC 62278-1 Railway applications - Specification and demonstration of reliability; availability; maintainability and safety (RAMS) - Part 1: Generic RAMS process, 2024

9_3039e_CDV.pdf [Go to Page]
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Abbreviations
5 Railway RAMS [Go to Page]
5.1 Introduction
5.2 Multi-level System approach [Go to Page]
5.2.1 Concepts of system hierarchy
Figure 1 — Illustration of system hierarchy [Go to Page]
5.2.2 System requirements and characteristics
5.2.3 Defining a system
5.3 Railway system overview [Go to Page]
5.3.1 Introduction
5.3.2 Stakeholders involved in a railway system
5.3.3 Railway system structure and apportionment of RAMS requirements
5.4 Railway RAMS and quality of service
Figure 2 – Quality of Service and Railway RAMS. [Go to Page]
5.5 Elements of railway RAMS
Figure 3 — Interrelation of railway RAMS elements
Figure 4 — Effects of failures within a system [Go to Page]
5.6 Factors influencing railway RAMS [Go to Page]
5.6.1 General
5.6.2 Classes of failures
5.6.3 Derivation of detailed railway specific influencing factors
Figure 5 — Factors Influencing Railway RAMS
Figure 6 — Example of deriving cause/effect relations in a diagrammatic approach0F ) [Go to Page]
5.6.4 Human factors
5.7 Specification of railway RAMS requirements [Go to Page]
5.7.1 General
5.7.2 RAMS specification
5.8 Risk based approach
5.9 Risk reduction strategy [Go to Page]
5.9.1 Introduction
5.9.2 Reduction of risks related to safety
5.9.3 Reduction of risks related to RAM
6 Management of railway RAMS – general requirements [Go to Page]
6.1 Introduction
6.2 Life cycle for the system under consideration
Figure 7 — Interrelation of RAMS management process and system life cycle
Figure 8 — The V-cycle representation
Table 1 (informative) — RAMS tasks for lifecycle phases 1 to 12 [Go to Page]
6.3 Risk assessment
Figure 9 — Process for Risk Assessment related to phases 3 and 4 (as per safety) [Go to Page]
6.4 Organisational requirements [Go to Page]
6.4.1 Introduction
6.4.2 Requirements
6.5 Application of this document and adaptability to project scope and size [Go to Page]
6.5.1 General requirements
6.5.2 Case of complex systems with different hierarchical levels
Figure 10 — Example of lifecycles at different hierarchical levels [Go to Page]
6.5.3 Renewal within existing systems
6.5.4 Re-use or adaptation of a system with previous acceptance
6.6 General requirements on RAMS documentation
6.7 Verification and validation [Go to Page]
6.7.1 Introduction
6.7.2 Verification
6.7.3 Validation
6.8 Independent Safety Assessment [Go to Page]
6.8.1 Objectives
6.8.2 Activities
7 RAMS life cycle [Go to Page]
7.1 General
7.2 Phase 1: Concept [Go to Page]
7.2.1 Objectives
7.2.2 Activities
7.2.3 Deliverables
7.3 Phase 2: System definition and operational context [Go to Page]
7.3.1 Objectives
7.3.2 Activities [Go to Page]
7.3.2.1 General
7.3.2.2 RAM Plan
7.3.2.3 Safety Plan
7.3.3 Deliverables
7.4 Phase 3: Risk analysis and evaluation [Go to Page]
7.4.1 Objectives
7.4.2 Activities [Go to Page]
7.4.2.1 Risk assessment
Figure 11 — Relationship of cause, hazard and accident [Go to Page]
7.4.2.2 Hazard Log
7.4.3 Deliverables
7.5 Phase 4: Specification of system requirements [Go to Page]
7.5.1 Objectives
7.5.2 Activities
7.5.3 Deliverables
7.5.4 Specific validation tasks
7.6 Phase 5: Architecture and apportionment of system requirements [Go to Page]
7.6.1 Objectives
7.6.2 Activities
7.6.3 Deliverables
7.7 Phase 6: Design and Implementation [Go to Page]
7.7.1 Objectives
7.7.2 Activities
7.7.3 Deliverables
7.7.4 Specific verification tasks
7.8 Phase 7: Manufacture [Go to Page]
7.8.1 Objectives
7.8.2 Activities
7.8.3 Deliverables
7.9 Phase 8: Integration [Go to Page]
7.9.1 Objectives
7.9.2 Activities
7.9.3 Deliverables
7.9.4 Specific verification tasks
7.10 Phase 9: System Validation [Go to Page]
7.10.1 Objectives
7.10.2 Activities
7.10.3 Deliverables
7.11 Phase 10: System acceptance [Go to Page]
7.11.1 Objectives
7.11.2 Activities
7.11.3 Deliverables
7.12 Phase 11: Operation, maintenance and performance monitoring [Go to Page]
7.12.1 Objectives
7.12.2 Activities
7.12.3 Deliverables
7.12.4 Specific verification tasks
7.13 Phase 12: Decommissioning [Go to Page]
7.13.1 Objectives
7.13.2 Activities
7.13.3 Deliverables
8 Safety Case [Go to Page]
8.1 Purpose of a safety case
8.2 Content of a safety case
Annex A (informative) RAMS plan
A.1 General
A.2 Procedure
A.3 Basic RAMS plan example
Table A.1 — Example of a basic RAMS plan outline
A.4 List of techniques
Annex B (informative) Examples of parameters for railway
B.1 General
B.2 Reliability parameters
Table B.1 — Examples of reliability parameters
B.3 Maintainability parameters
Table B.2 — Examples of maintainability parameters
B.4 Availability parameters
Table B.3 — Examples of availability parameters
a) corrective maintenance
b) preventive maintenance
B.5 Logistic support parameters
Table B.4 — Examples of logistic support parameters
B.6 Safety parameters
Table B.5 — Examples of safety performance parameters
Annex C (informative) Risk matrix calibration and risk acceptance categories
C.1 General
C.2 Frequency of occurrence categories
Table C.1 — Frequency of occurrence of hazardous events with examples for quantification (time based)
Table C.2 — Frequency of occurrence of events with examples for quantification (distance based)
C.3 Severity categories
Table C.3 — Severity categories (example related to RAM)
Table C.4 — Severity categories (example 1 related to RAMS)
Table C.5 — Severity categories (example 2 related to Safety)
Table C.6 — Financial severity categories (example)
C.4 Risk acceptance categories
Table C.7 — Risk acceptance categories (example 1 for binary decisions)
Table C.8 — Risk acceptance categories (example 2)
Table C.9 — Risk acceptance categories (example related to safety)
Table C.10 — Risk acceptance categories (example related to RAM)
Annex D (informative) Guidance on system definition
D.1 General
D.2 System Definition in an iterative system approach
D.3 Method for defining the structure of a system
D.3.1 General
D.3.2 Function List
D.3.3 Functional breakdown
Table D.1 — Typical examples for a functional breakdown
D.4 Parties/stakeholders/boundaries of systems
D.5 Guidance on the content of a system definition
Bibliography [Go to Page]

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