prEN 50126-1
(Main)Railway applications - The Specification and Demonstration of Reliability, Availability, Maintainability and Safety (RAMS) - Part 1: Generic RAMS process
Railway applications - The Specification and Demonstration of Reliability, Availability, Maintainability and Safety (RAMS) - Part 1: Generic RAMS process
2014-03 TC Decision: WI to be stopped as draft for vote cannot be delivered on time in the frame of the 3-year timeframe * 2012-06-22 - Enquiry editing allocated to aclausse@cencenelec.eu * D144/C085: Second extension of the target date for vote approved to read 2014-03-05 with transfer in the new audit system
Bahnanwendungen - Spezifikation und Nachweis von Zuverlässigkeit, Verfügbarkeit, Instandhaltbarkeit und Sicherheit (RAMS) - Teil 1: Generischer RAMS- Prozess
Applications ferroviaires - Spécification et démonstration de la fiabilité, de la disponibilité, de la maintenabilité et de la sécurité (FDMS) - Partie 1: Processus FDMS générique
Železniške naprave - Specifikacija in prikaz zanesljivosti, razpoložljivosti, vzdrževalnosti in varnosti (RAMS) - 1. del: Generični procesi RAMS
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Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 50126-1:2013
01-januar-2013
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Railway applications - The Specification and Demonstration of Reliability, Availability,
Maintainability and Safety (RAMS) - Part 1: Generic RAMS process
Bahnanwendungen - Spezifikation und Nachweis von Zuverlässigkeit, Verfügbarkeit,
Instandhaltbarkeit und Sicherheit (RAMS) - Teil 1: Generischer RAMS- Prozess
Applications ferroviaires - Spécification et démonstration de la fiabilité, de la disponibilité,
de la maintenabilité et de la sécurité (FDMS) - Partie 1: Processus FDMS générique
Ta slovenski standard je istoveten z: prEN 50126-1:2012
ICS:
29.280 (OHNWULþQDYOHþQDRSUHPD Electric traction equipment
45.020 Železniška tehnika na Railway engineering in
splošno general
oSIST prEN 50126-1:2013 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 50126-1:2013
DRAFT
EUROPEAN STANDARD
prEN 50126-1
NORME EUROPÉENNE
October 2012
EUROPÄISCHE NORM
ICS 45.020 Will supersede EN 50126-1:1999 (partially), CLC/TR 50126-2:2007, CLC/TR 50126-3:2008
English version
Railway applications -
The Specification and Demonstration of Reliability, Availability,
Maintainability and Safety (RAMS) -
Part 1: Generic RAMS process
Applications ferroviaires - Bahnanwendungen -
Spécification et démonstration de la fiabilité, Spezifikation und Nachweis von
de la disponibilité, de la maintenabilité et de Zuverlässigkeit, Verfügbarkeit,
la sécurité (FDMS) - Instandhaltbarkeit und Sicherheit (RAMS) -
Partie 1: Processus FDMS générique Teil 1: Generischer RAMS- Prozess
This draft European Standard is submitted to CENELEC members for CENELEC enquiry.
Deadline for CENELEC: 2013-03-29.
It has been drawn up by CLC/TC 9X.
If this draft becomes a European Standard, CENELEC members are bound to comply with the CEN/CENELEC Internal
Regulations which stipulate the conditions for giving this European Standard the status of a national standard without
any alteration.
This draft European Standard was established by CENELEC in three official versions (English, French, German). A
version in any other language made by translation under the responsibility of a CENELEC member into its own
language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they
are aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change
without notice and shall not be referred to as a European Standard.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Project: 21752 Ref. No. prEN 50126-1:2012 E
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1 Contents Page
2 Foreword . 6
3 In tro d uct i on . 7
4 1 Scope . 9
5 2 Normative references. 10
6 3 Terms and definitions . 10
7 4 A bbr e v i a t i ons . 19
8 5 Process overview . 20
9 5.1 Purpose of overview . 20
10 5.2 Objective . 20
11 5.3 Management responsibility . 20
12 5.4 Adaptability to project scope and size . 20
13 5.5 Interrelation of RAMS management process and life-cycle . 21
14 5.6 Short description of life-cycle phases. 23
15 6 Railway RAMS . 24
16 6.1 Introduction . 24
17 6.2 System-level approach . 24
18 6.2.1 Concepts of system hierarchy . 24
19 6.2.2 A system’s requirements and characteristics . 25
20 6.2.3 Defining a system . 26
21 6.3 Railway system overview . 26
22 6.3.1 Introduction. 26
23 6.3.2 Bodies/entities involved in a railway system . 27
24 6.3.3 Railway system environment and the balance of requirements . 27
25 6.3.4 Railway system structure and apportionment of RAMS requirements . 27
26 6.4 Railway RAMS and quality of service . 28
27 6.5 Elements of railway RAMS . 28
28 6.6 Factors influencing railway RAMS . 29
29 6.6.1 General . 29
30 6.6.2 Classes of failures . 30
31 6.6.3 Derivation of detailed railway specific influencing factors . 30
32 6.6.4 Evaluation of factors . 34
33 6.7 Specification of railway RAMS requirements . 34
34 6.7.1 General . 34
35 6.7.2 RAMS specification . 34
36 6.8 Risk based approach . 35
37 6.9 Risk reduction strategy . 36
38 6.9.1 Introduction. 36
39 6.9.2 Reduction of risks related to safety . 36
40 6.10 Safety integrity . 37
41 6.10.1 Safety integrity concept . 37
42 7 Management of railway RAMS . 38
43 7.1 RAMS process . 38
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44 7.1.1 General . 38
45 7.1.2 Safety management within the RAMS Process . 38
46 7.1.3 Independence of roles . 39
47 7.2 System life-cycle . 39
48 7.3 Application and tailoring of this standard . 46
49 7.4 General requirements on RAMS documentation . 47
50 8 RAMS life-cycle . 48
51 8.1 General . 48
52 8.2 Phase 1: concept . 48
53 8.2.1 Objectives . 48
54 8.2.2 Activities . 48
55 8.2.3 Deliverables . 49
56 8.2.4 Specific verification tasks. 49
57 8.2.5 Specific validation tasks . 49
58 8.3 Phase 2: system definition and operational context . 49
59 8.3.1 Objectives . 49
60 8.3.2 Activities . 49
61 8.3.3 Deliverables . 53
62 8.3.4 Specific verification tasks. 53
63 8.3.5 Specific validation tasks . 53
64 8.4 Phase 3: risk analysis and evaluation . 53
65 8.4.1 Objectives . 53
66 8.4.2 Activities . 54
67 8.4.3 Deliverables . 55
68 8.4.4 Specific verification tasks. 55
69 8.4.5 Specific validation tasks . 55
70 8.5 Phase 4: specification of system requirements . 56
71 8.5.1 Objectives . 56
72 8.5.2 Activities . 56
73 8.5.3 Deliverables . 57
74 8.5.4 Specific verification tasks. 57
75 8.5.5 Specific validation tasks . 57
76 8.6 Phase 5: architecture and apportionment of system requirements. 57
77 8.6.1 Objectives . 57
78 8.6.2 Activities . 58
79 8.6.3 Deliverables . 58
80 8.6.4 Specific verification tasks. 59
81 8.6.5 Specific validation tasks . 59
82 8.7 Phase 6: design and implementation . 59
83 8.7.1 Objectives . 59
84 8.7.2 Activities . 59
85 8.7.3 Deliverables . 60
86 8.7.4 Specific verification tasks. 60
87 8.7.5 Specific validation tasks . 60
88 8.8 Phase 7: manufacture . 60
89 8.8.1 Objectives . 60
90 8.8.2 Activities . 60
91 8.8.3 Deliverables . 61
92 8.8.4 Specific verification tasks. 61
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93 8.8.5 Specific validation tasks . 61
94 8.9 Phase 8: integration. 61
95 8.9.1 Objectives . 61
96 8.9.2 Activities . 61
97 8.9.3 Deliverables . 62
98 8.9.4 Specific verification tasks. 62
99 8.9.5 Specific validation tasks . 62
100 8.10 Phase 9: system validation . 62
101 8.10.1 Objectives . 62
102 8.10.2 Activities . 62
103 8.10.3 Deliverables . 63
104 8.10.4 Specific verification tasks. 63
105 8.10.5 Specific validation tasks . 63
106 8.11 Phase 10: system acceptance . 63
107 8.11.1 Objectives . 63
108 8.11.2 Activities . 63
109 8.11.3 Deliverables . 64
110 8.11.4 Specific verification tasks. 64
111 8.11.5 Specific validation tasks . 64
112 8.12 Phase 11: operation, maintenance and performance monitoring . 64
113 8.12.1 Objectives . 64
114 8.12.2 Activities . 64
115 8.12.3 Deliverables . 65
116 8.12.4 Specific verification tasks. 65
117 8.12.5 Specific validation tasks . 65
118 8.13 Phase 12: decommissioning . 65
119 8.13.1 Objectives . 65
120 8.13.2 Activities . 66
121 8.13.3 Deliverables . 66
122 8.13.4 Specific verification tasks. 66
123 8.13.5 Specific validation tasks . 66
124 9 Risk assessment . 66
125 9.1 Scope . 66
126 9.2 Risk analysis methodology . 66
127 9.3 Risk evaluation and acceptance . 69
128 9.3.1 Acceptance principles . 69
129 9.3.2 Methods for determining risk acceptance criteria . 69
130 10 Deliverables and structure of a safety case . 70
131 10.1 Purpose of a safety case . 70
132 10.2 Types of safety case . 70
133 10.3 Safety case structure . 71
134 10.3.1 General . 71
135 10.3.2 Definition of system . 72
136 10.3.3 Quality management report . 73
137 10.3.4 Safety management report . 73
138 10.3.5 Technical safety report . 74
139 10.3.6 Related safety cases . 75
140 10.3.7 Co nc lus i o n . 75
141 10.3.8 References . 75
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142 Annex A (informative) RAMS plan . 76
143 Annex B (informative) Examples of parameters for railway . 81
144 B.1 Reliability parameters . 81
145 B.2 Maintainability parameters . 81
146 B.3 Availability parameters . 82
147 B.4 Logistic support parameters . 83
148 B.5 Safety parameters . 84
149 Annex C (informative) Hazards at railway system level – example structured list. 85
150 C.1 Example list . 86
151 Annex D (informative) Risk matrix calibration and risk acceptance categories . 91
152 D.1 Frequency of occurrence levels . 91
153 D.2 Severity levels . 92
154 D.3 Risk acceptance categories . 93
155 Bibliograph y . 95
156
157 Figure 1 – Interrelation of RAMS-management process and system life-cycle . 22
158 Figure 2 − Illustration of system hierarchy . 25
159 Figure 3 − Example of deriving cause/effect relations in a diagrammatic approach . 32
160 Figure 4 − Relationship of cause, hazard and accident . 36
161 Figure 5 − The "V" representation drawing . 41
162 Figure 6 – Verification . 42
163 Figure 7 – Validation . 42
164 Figure 8 − Structure of a safety case . 72
165 Figure B.1 – Availability concept and related terms . 83
166
167 Table 1 – System phase related tasks (informative) . 43
168 Table 2 – Frequency – Severity matrix . 69
169 Table A.1 – Example of a basic RAMS plan outline . 77
170 Table B.1 – Examples of reliability parameters . 81
171 Table B.2 – Examples of maintainability parameters . 81
172 Table B.3 – Examples of availability parameters . 82
173 Table B.4 – Examples of logistic support parameters . 83
174 Table B.5 – Examples of safety performance parameters . 84
175 Table C.1 – Example for a hazard list . 87
176 Table C.2 – Example scenarios . 89
177 Table D.1 – Frequency of occurrence of events with examples for quantification (time based) . 91
178 Table D.2 – Frequency of occurrence of events with examples for quantification (distance based) . 92
179 Table D.3 – Severity categories (example related to RAM) . 92
180 Table D.4 – Severity categories (example 1 related to RAMS) . 93
181 Table D.5 – Categories (example 2 related to Safety) . 93
182 Table D.6 – Financial severity levels (example) . 93
183 Table D.7 – Risk acceptance categories (example 1 for binary decisions) . 93
184 Table D.8 – Risk acceptance categories (example 2) . 94
185 Table D.9 – Risk acceptance categories (example related to safety) . 94
186
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187 Foreword
188 This document [prEN 50126-1:2012] has been prepared by CLC/TC 9X "Electrical and electronic
189 applications for railways".
190 This document is currently submitted to the Enquiry.
191 EN 50126 "Railway applications – The specification and demonstration of Reliability, Availability,
192 Maintainability and Safety (RAMS)" consists of the following parts:
193 – Part 1: Generic RAMS process;
194 – Part 2: Systems approach to safety;
195 – Part 4: Functional safety – Electrical/Electronic/Programmable electronic systems;
196 – Part 5: Functional safety – Software.
197 This new edition of EN 50126 (all parts) will supersede EN 50126-1:1999,
198 CLC/TR 50126-2:2007, CLC/TR 50126-3:2008, EN 50128:2011 and EN 50129:2003.
199 This part of EN 50126 covers the RAMS process. It is mainly based on EN 50126-1:1999.
200 This part of EN 50126 will supersede EN 50126-1:1999 (together with prEN 50126-2:2012),
201 CLC/TR 50126-2:2007 and CLC/TR 50126-3:2008.
202 This document has been prepared under a mandate given to CENELEC by the European
203 Commission and the European Free Trade Association, and supports essential requirements of
204 EU Directive(s).
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205 Introduction
206 EN 50126-1:1999 was produced to introduce the application of a systematic RAMS management
207 process in the railway sector. For safety-related electronic systems for signalling, EN 50128 and
208 EN 50129 were produced. Through the application of these standards and the experiences
209 gained over the last years, the need for revision and restructuring became apparent with a need
210 to deliver a systematic and coherent approach to RAMS applicable to all the railway application
211 fields Signalling, Rolling Stock and Electric power supply for Railways (Fixed Installations).
212 The revision work improved the coherency and consistency of the standards, the concept of
213 safety management and the practical usage of EN 50126 and took into consideration the existing
214 and related Technical Reports as well.
215 This European Standard provides railway duty holders and the railway suppliers, throughout the
216 European Union, with a process which will enable the implementation of a consistent approach to
217 the management of reliability, availability, maintainability and safety, denoted by the acronym
218 RAMS.
219 Processes for the specification and demonstration of RAMS requirements are cornerstones of
220 this standard. T
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