Railway Applications - The Specification and Demonstration of Reliability, Availability, Maintainability and Safety (RAMS) - Part 1: Generic RAMS Process

The part 1 of EN 50126
* considers RAMS, understood as reliability, availability, maintainability and safety and their interaction;
* considers the generic aspects of the RAMS life-cycle. The guidance in this part is still applicable in the application of specific standards;
* defines
- a process, based on the system life-cycle and tasks within it, for managing RAMS;
- a systematic process, tailorable to the type and size of system under consideration, for specifying requirements for RAMS and demonstrating that these requirements are achieved;
* addresses railway specifics;
* enables conflicts between RAMS elements to be controlled and managed effectively;
* does not define
- RAMS targets, quantities, requirements or solutions for specific railway applications;
- rules or processes pertaining to the certification of railway products against the requirements of this standard;
- an approval process by the safety authority;
* does not specify requirements for ensuring system security.
The part 1 of EN 50126 is applicable
* to the specification and demonstration of RAMS for all railway applications and at all levels of such an application, as appropriate, from complete railway systems to major systems and to individual and combined sub-systems and  components within these major systems, including those containing software; in particular:
- to new systems;
- to new systems integrated into existing systems accepted prior to the creation of this standard, but only to the extent and insofar as the new system with the new functionality is being integrated. It is otherwise not applicable to any unmodified aspects of the existing system;
- as far as reasonably practicable, to modifications and extensions of existing systems accepted prior to the creation of this standard, but only to the extent and insofar as existing systems are being modified. it is otherwise not applicable to any unmodified aspect of the existing system;
* at all relevant phases of the life-cycle of an application;
* for use by railway duty holders and the railway suppliers.
It is not required to apply this standard to existing systems including those systems already compliant with any version of former EN 50126, which remain unmodified. Railway applications mean Command, Control & Signalling, Rolling Stock and Fixed Installations.
Processes for the specification and demonstration of RAMS requirements are cornerstones of this standard. This European Standard promotes a common understanding and approach to the management of RAMS.
The process defined by this European Standard assumes that railway duty holders and railway suppliers have business-level policies addressing Quality, Performance and Safety. The approach defined in this standard is consistent with the application of quality management requirements contained within the ISO 9001.

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 FMDS générique

La présente Partie 1 de l'EN 50126 :
-   définit la FDMS en termes de fiabilité, de disponibilité, de maintenabilité et de sécurité et leurs interactions ;
-   prend en considération les aspects génériques du cycle de vie FDMS. Les lignes directrices de la présente partie s'appliquent également lors de l'application de normes spécifiques ;
-   définit :
-   un processus de management de la FDMS fondé sur le cycle de vie du système et les tâches qui en font partie ;
-   un processus systématique adaptable au type et à la taille du système en cours d'examen, permettant de spécifier les exigences de la FDMS et de démontrer que ces exigences sont satisfaites ;
-   prend en compte les spécificités du domaine ferroviaire ;
-   permet de contrôler et de gérer efficacement les conflits entre les composantes de la FDMS ;
-   ne définit pas :
-   les objectifs de FDMS, ni les grandeurs, les exigences ou les solutions pour des applications ferroviaires spécifiques ;
-   les règles ou les processus de certification des produits ferroviaires vis-à-vis des exigences de la présente norme ;
-   un processus d'homologation pour les parties prenantes ferroviaires.
La présente Partie 1 de l'EN 50126 s'applique aux domaines d'application ferroviaire, à savoir Contrôle commande et Signalisation, Matériel Roulant et Installations Fixes, et spécifiquement :
-   à la spécification et à la démonstration des exigences de FDMS pour toute application ferroviaire et à tout niveau d'une telle application, selon le cas, allant des systèmes ferroviaires complets aux grands systèmes et aux sous-systèmes et équipements (individuels et combinés) de ces grands systèmes, y compris ceux qui comportent des logiciels. Elle est notamment applicable :
-   aux nouveaux systèmes ;
-   aux nouveaux systèmes intégrés dans des systèmes préexistants acceptés, mais seulement dans la mesure où, et dans la façon dont le nouveau système comprenant la nouvelle fonctionnalité y est intégré. Elle n'est sinon pas applicable aux parties inchangées du système existant ;
-   dans toute la mesure du possible, aux modifications et extensions des systèmes préexistants, mais seulement dans la mesure où, et dans la façon dont les systèmes existants sont modifiés. Elle n'est sinon pas applicable aux parties inchangées du système existant ;
-   à toutes les phases concernées du cycle de vie d'une application donnée ;
-   à l'utilisation des sociétés d'exploitation ferroviaire et des industries ferroviaires.
Il n'est pas nécessaire d'appliquer la présente norme aux systèmes existants qui ne sont pas modifiés, y compris ceux déjà conformes à toute version antérieure de l'EN 50126.
Le processus défini par la présente Norme européenne part du principe que les sociétés d'exploitation et les industries ferroviaires ont développé au niveau de l'entreprise des politiques de Qualité, Performances et Sécurité. L'approche définie dans la présente norme est en accord avec l'application des exigences de management de la qualité de l'EN ISO 9001.

Železniške naprave - Specifikacija in prikaz zanesljivosti, razpoložljivosti, vzdrževalnosti in varnosti (RAMS) - 1. del: Generični procesi RAMS

Del 1 standarda EN 50126:
* obravnava RAMS, kar pomeni zanesljivost, razpoložljivost, vzdrževalnost in varnost ter njihove interakcije;
* obravnava splošne vidike življenjskega cikla RAMS. Vodilo v tem delu se še vedno uporablja za določene standarde;
* določa:
– proces, ki temelji na življenjskem ciklu sistema in opravilih v njegovem okviru, za upravljanje RAMS;
– sistematični proces, ki ga je mogoče prilagoditi vrsti in velikosti zadevnega sistema, za določanje zahtev za RAMS in dokazovanje, da so zahteve izpolnjene;
* obravnava posebnosti železniških naprav;
* omogoča učinkovit nadzor in upravljanje nasprotij med elementi RAMS;
* ne določa:
– ciljev, količin, zahtev ali rešitev RAMS za določene železniške naprave;
– pravil ali procesov, ki se nanašajo na certificiranje železniških proizvodov na podlagi zahtev tega standarda;
– procesa odobritve varnostnega organa;
* ne določa zahtev za zagotavljanje varnosti sistema.
1. del standarda EN 50126 se uporablja za:
* specifikacijo in prikaz RAMS za vse uporabe železniških naprav in na vseh ravneh take uporabe, kot je ustrezno, od celotnih železniških sistemov do večjih sistemov in posameznih ter združenih podsistemov in komponent v teh večjih sistemih, vključno s tistimi, ki vsebujejo programsko opremo; še zlasti:
– pri novih sistemih;
– pri novih sistemih, ki so vgrajeni v obstoječe sisteme, sprejete pred nastankom tega standarda, vendar le v obsegu in v kolikor gre za vgradnjo novega sistema z novo funkcionalnostjo. V nasprotnem primeru se ne uporablja za noben nespremenjen vidik obstoječega sistema;
– v kolikor je smiselno, pri spremembah in razširitvah obstoječih sistemov, sprejetih pred nastankom tega standarda, vendar le v obsegu in v kolikor gre za spremembo obstoječih sistemov. V nasprotnem primeru se ne uporablja za noben nespremenjen vidik obstoječega sistema;
* v vseh ustreznih fazah življenjskega cikla uporabe;
* za uporabo s strani nosilcev dolžnosti in dobaviteljev v železniškem prometu.
Uporaba tega standarda ni zahtevana za obstoječe sisteme, vključno s sistemi, ki so že v skladu s katero koli različico prejšnjega standarda EN 50126, ki ostanejo nespremenjeni. Izraz »železniške naprave« zajema upravljanje, vodenje, signaliziranje, vozna sredstva in nepremične naprave.
Procesi za specifikacijo in prikaz zahtev RAMS so podlaga tega standarda. Ta evropski standard spodbuja splošno razumevanje in pristop k upravljanju RAMS.
Postopek, ki ga določa ta evropski standard, predvideva, da imajo nosilci dolžnosti in dobavitelji v železniškem prometu poslovne programe, ki obravnavajo kakovost, zmogljivost in varnost. Pristop, ki je določen v tem standardu, je skladen z uporabo zahtev za vodenje kakovosti, ki so zajete v standardu ISO 9001.

General Information

Status
Published
Public Enquiry End Date
29-Nov-2015
Publication Date
10-Dec-2017
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
28-Nov-2017
Due Date
02-Feb-2018
Completion Date
11-Dec-2017

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SLOVENSKI STANDARD
SIST EN 50126-1:2018
01-januar-2018
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SIST EN 50126-1:2001
SIST EN 50126-1:2001/AC: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
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Ta slovenski standard je istoveten z: EN 50126-1:2017
ICS:
03.120.01 Kakovost na splošno Quality in general
45.020 Železniška tehnika na Railway engineering in
splošno general
SIST EN 50126-1:2018 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 50126-1:2018

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SIST EN 50126-1:2018

EUROPEAN STANDARD EN 50126-1

NORME EUROPÉENNE

EUROPÄISCHE NORM
October 2017
ICS 29.280; 45.020 Supersedes EN 50126-1:1999
English Version
Railway Applications - The Specification and Demonstration of
Reliability, Availability, Maintainability and Safety (RAMS) - Part
1: Generic RAMS Process
Applications ferroviaires - Spécification et démonstration de Bahnanwendungen - Spezifikation und Nachweis von
la fiabilité, de la disponibilité, de la maintenabilité et de la Zuverlässigkeit, Verfügbarkeit, Instandhaltbarkeit und
sécurité (FDMS) - Partie 1: Processus FMDS générique Sicherheit (RAMS) - Teil 1: Generischer RAMS Prozess
This European Standard was approved by CENELEC on 2017-07-03. 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.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists 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, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.



European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 50126-1:2017 E

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SIST EN 50126-1:2018
EN 50126-1:2017 (E)
Contents Page
European foreword . 6
Introduction . 7
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 9
4 Abbreviations . 20
5 Railway RAMS . 20
5.1 Introduction . 20
5.2 Multi-level System approach . 21
5.2.1 Concepts of system hierarchy . 21
5.2.2 System requirements and characteristics . 22
5.2.3 Defining a system . 23
5.3 Railway system overview . 23
5.3.1 Introduction . 23
5.3.2 Stakeholders involved in a railway system . 23
5.3.3 Railway system structure and apportionment of RAMS requirements . 24
5.4 Railway RAMS and quality of service . 24
5.5 Elements of railway RAMS . 24
5.6 Factors influencing railway RAMS . 27
5.6.1 General . 27
5.6.2 Classes of failures . 27
5.6.3 Derivation of detailed railway specific influencing factors . 27
5.6.4 Human factors . 32
5.7 Specification of railway RAMS requirements . 34
5.7.1 General . 34
5.7.2 RAMS specification . 34
5.8 Risk based approach . 34
5.9 Risk reduction strategy . 35
5.9.1 Introduction . 35
5.9.2 Reduction of risks related to safety . 35
5.9.3 Reduction of risks related to RAM . 36
6 Management of railway RAMS – general requirements . 37
6.1 Introduction . 37
6.2 Life cycle for the system under consideration. 37
6.3 Risk assessment . 45
6.4 Organisational requirements . 46
6.4.1 Introduction . 46
6.4.2 Requirements . 47
6.5 Application of this standard and adaptability to project scope and size . 47
6.5.1 General requirements . 47
6.5.2 Case of complex systems with different hierarchical levels. 49
6.5.3 Renewal within existing systems . 50
2

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SIST EN 50126-1:2018
EN 50126-1:2017 (E)
6.5.4 Re-use or adaptation of a system with previous acceptance. 50
6.6 General requirements on RAMS documentation . 51
6.7 Verification and Validation . 52
6.7.1 Introduction . 52
6.7.2 Verification. 52
6.7.3 Validation . 52
6.8 Independent Safety Assessment . 53
6.8.1 Objectives . 53
6.8.2 Activities . 54
7 RAMS life cycle . 55
7.1 General . 55
7.2 Phase 1: Concept . 55
7.2.1 Objectives . 55
7.2.2 Activities . 56
7.2.3 Deliverables . 56
7.3 Phase 2: System definition and operational context . 56
7.3.1 Objectives . 56
7.3.2 Activities . 56
7.3.3 Deliverables . 60
7.4 Phase 3: Risk analysis and evaluation . 60
7.4.1 Objectives . 60
7.4.2 Activities . 61
7.4.3 Deliverables . 64
7.5 Phase 4: Specification of system requirements . 64
7.5.1 Objectives . 64
7.5.2 Activities . 65
7.5.3 Deliverables . 66
7.5.4 Specific validation tasks . 66
7.6 Phase 5: Architecture and apportionment of system requirements . 67
7.6.1 Objectives . 67
7.6.2 Activities . 67
7.6.3 Deliverables . 68
7.7 Phase 6: Design and Implementation . 68
7.7.1 Objectives . 68
7.7.2 Activities . 68
7.7.3 Deliverables . 69
7.7.4 Specific verification tasks . 70
7.8 Phase 7: Manufacture . 70
7.8.1 Objectives . 70
7.8.2 Activities . 70
7.8.3 Deliverables . 71
7.9 Phase 8: Integration . 71
7.9.1 Objectives . 71
7.9.2 Activities . 71
7.9.3 Deliverables . 72
7.9.4 Specific verification tasks . 72
7.10 Phase 9: System Validation . 73
7.10.1 Objectives . 73
3

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SIST EN 50126-1:2018
EN 50126-1:2017 (E)
7.10.2 Activities . 73
7.10.3 Deliverables . 73
7.11 Phase 10: System acceptance . 74
7.11.1 Objectives . 74
7.11.2 Activities . 75
7.11.3 Deliverables . 75
7.12 Phase 11: Operation, maintenance and performance monitoring . 75
7.12.1 Objectives . 75
7.12.2 Activities . 75
7.12.3 Deliverables . 78
7.12.4 Specific verification tasks . 79
7.13 Phase 12: Decommissioning . 79
7.13.1 Objectives . 79
7.13.2 Activities . 79
7.13.3 Deliverables . 79
8 Safety Case . 79
8.1 Purpose of a safety case . 79
8.2 Content of a safety case . 80
Annex A (informative) RAMS plan . 82
A.1 General. 82
A.2 Procedure . 82
A.3 Basic RAMS plan example . 82
A.4 List of techniques . 84
Annex B (informative) Examples of parameters for railway . 86
B.1 General. 86
B.2 Reliability parameters . 86
B.3 Maintainability parameters . 86
B.4 Availability parameters . 87
B.5 Logistic support parameters . 89
B.6 Safety parameters . 89
Annex C (informative) Risk matrix calibration and risk acceptance categories . 90
C.1 General. 90
C.2 Frequency of occurrence categories . 90
C.3 Severity categories . 92
C.4 Risk acceptance categories . 93
Annex D (informative) Guidance on system definition . 95
D.1 General. 95
D.2 System Definition in an iterative system approach . 95
D.3 Method for defining the structure of a system . 95
D.3.1 General . 95
D.3.2 Function List . 95
D.3.3 Functional breakdown . 95
D.4 Parties/stakeholders/boundaries of systems . 96
D.5 Guidance on the content of a system definition . 96
4

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SIST EN 50126-1:2018
EN 50126-1:2017 (E)
Annex ZZ (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2008/57/EC . 98
Bibliography . 102

Table 1 — RAMS tasks along life-cycle phases (1 of 4) . 41
Table A.1 – Example of a basic RAMS plan outline (part 1 of 2) . 83
Table B.1 – Examples of reliability parameters . 86
Table B.2 – Examples of maintainability parameters . 86
Table B.3 – Examples of availability parameters . 87
Table B.4 – Examples of logistic support parameters . 90
Table B.5 – Examples of safety performance parameters . 90
Table C.1 – Frequency of occurrence of hazardous events with examples for quantification
(time based) . 91
Table C.2 – Frequency of occurrence of events with examples for quantification (distance based) . 92
Table C.3 – Severity categories (example related to RAM) . 93
Table C.4 – Severity categories (example 1 related to RAMS) . 93
Table C.5 – Severity categories (example 2 related to Safety) . 94
Table C.6 – Financial severity categories (example) . 94
Table C.7 – Risk acceptance categories (example 1 for binary decisions) . 94
Table C.8 – Risk acceptance categories (example 2) . 94
Table C.9 – Risk acceptance categories (example related to safety) . 95
Table D.1 – Typical examples for a functional breakdown . 97
5

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SIST EN 50126-1:2018
EN 50126-1:2017 (E)
European foreword
This document (EN 50126-1:2017) has been prepared by CLC/TC 9X "Electrical and electronic
applications for railways".
The following dates are fixed:
• latest date by which this document has (dop) 2018-07-03
to be implemented at national level by
publication of an identical national
standard or by endorsement
latest date by which the national (dow) 2020-07-03

standards conflicting with this document
have to be withdrawn
This document supersedes EN 50126-1:1999 which has been technically revised.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
EN 50126 "Railway applications – The specification and demonstration of Reliability, Availability,
Maintainability and Safety (RAMS)" consists of the following parts:
— Part 1: Generic RAMS process;
— Part 2: System approach to safety.
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association, and supports essential requirements of EU Directive(s).
For the relationship with EU Directive(s) see informative Annex ZZ, which is an integral part of this
document.
6

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SIST EN 50126-1:2018
EN 50126-1:2017 (E)
Introduction
EN 50126-1:1999 was aimed at introducing the application of a systematic RAMS management process
in the railway sector. Through the application of this standard and the experiences gained over the last
years, the need for revision and restructuring became apparent with a need to deliver a systematic and
coherent approach to RAMS applicable to all the railway application fields Command, Control and
Signalling (Signalling), Rolling Stock and Electric power supply for Railways (Fixed Installations).
The revision work improved the coherency and consistency of the standard, the concept of safety
management and the practical usage of EN 50126, and took into consideration the existing and related
Technical Reports as well.
This European Standard provides railway duty holders and the railway suppliers, throughout the
European Union, with a process which will enable the implementation of a consistent approach to the
management of reliability, availability, maintainability and safety, denoted by the acronym RAMS.
Processes for the specification and demonstration of RAMS requirements are cornerstones of this
standard. This European Standard promotes a common understanding and approach to the
management of RAMS.
EN 50126 forms part of the railway sector specific application of IEC 61508. Meeting the requirements in
this European Standard together with the requirements of other suitable standards is sufficient to ensure
that additional compliance to IEC 61508 does not need to be demonstrated.
With regard to safety, EN 50126-1 provides a Safety Management Process which is supported by
guidance and methods described in EN 50126-2.
EN 50126-1 and EN 50126-2 are independent from the technology used. As far as safety is concerned,
EN 50126 takes the perspective of safety with a functional approach.
The application of this standard can be adapted to the specific requirements for the system under
consideration.
This European Standard can be applied systematically by the railway duty holders and railway suppliers,
throughout all phases of the life cycle of a railway application, to develop railway specific RAMS
requirements and to achieve compliance with these requirements. The system-level approach
developed by this European Standard facilitates assessment of the RAMS interactions between
elements of railway applications even if they are of complex nature.
This European Standard promotes co-operation between the stakeholders of Railways in the
achievement of an optimal combination of RAMS and cost for railway applications. Adoption of this
European Standard will support the principles of the European Single Market and facilitate European
railway inter-operability.
1)
In accordance with CENELEC editing rules , mandatory requirements in this standard are indicated
with the modal verb “shall”. Where justifiable, the standard permits process tailoring.
Specific guidance on the application of this standard for Safety aspects is provided in EN 50126-2.
EN 50126-2 provides various methods for use in the safety management process. Where a particular
method is selected for the system under consideration, the mandatory requirements for this method are
by consequence mandatory for the safety management of the system under consideration.
This European Standard consists of the main part (Clause 1 to Clause 8) and Annexes A, B, C, D and
ZZ. The requirements defined in the main part of the standard are normative, whilst Annexes are
informative.
—————————
1) CEN/CENELEC Internal Regulations Part 3: Rules for the structure and drafting of CEN/CENELEC Publications
(2017-02), Annex H.
7

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SIST EN 50126-1:2018
EN 50126-1:2017 (E)
1 Scope
This part 1 of EN 50126
• considers RAMS, understood as reliability, availability, maintainability and safety and their
interaction;
• considers the generic aspects of the RAMS life cycle. The guidance in this part can still be used in
the application of specific standards;
• defines:
– a process, based on the system life cycle and tasks within it, for managing RAMS;
– a systematic process, tailorable to the type and size of the system under consideration, for
specifying requirements for RAMS and demonstrating that these requirements are achieved;
• addresses railway specifics;
• enables conflicts between RAMS elements to be controlled and managed effectively;
• does not define:
– RAMS targets, quantities, requirements or solutions for specific railway applications;
– rules or processes pertaining to the certification of railway products against the requirements of
this standard;
– an approval process for the railway stakeholders.
This part 1 of EN 50126 is applicable to railway application fields, namely Command, Control and
Signalling, Rolling Stock and Fixed Installations, and specifically:
• to the specification and demonstration of RAMS for all railway applications and at all levels of such
an application, as appropriate, from complete railway systems to major systems and to individual
and combined subsystems and components within these major systems, including those containing
software; in particular:
– to new systems;
– to new systems integrated into existing systems already accepted, but only to the extent and
insofar as the new system with the new functionality is being integrated. It is otherwise not
applicable to any unmodified aspects of the existing system;
– as far as reasonably practicable, to modifi
...

SLOVENSKI STANDARD
SIST EN 50126-1:2018
01-januar-2018
Nadomešča:
SIST EN 50126-1:2001
SIST EN 50126-1:2001/AC:2013
SIST-TP CLC/TR 50126-3:2008
Železniške naprave - Specifikacija in prikaz zanesljivosti, razpoložljivosti,
vzdrževalnosti in varnosti (RAMS) - 1. del: Generični procesi RAMS
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 FMDS générique
Ta slovenski standard je istoveten z: EN 50126-1:2017
ICS:
03.120.01 Kakovost na splošno Quality in general
45.020 Železniška tehnika na Railway engineering in
splošno general
SIST EN 50126-1:2018 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 50126-1:2018

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SIST EN 50126-1:2018


EN 50126-1
NORME EUROPÉENNE

EUROPÄISCHE NORM

EUROPEAN STANDARD
Octobre 2017
ICS 29.280; 45.020 Remplace EN 50126-1:1999
Version française
Applications ferroviaires - Spécification et démonstration de la
fiabilité, de la disponibilité, de la maintenabilité et de la sécurité
(FDMS) - Partie 1: Processus FMDS générique
Bahnanwendungen - Spezifikation und Nachweis von Railway Applications - The Specification and Demonstration
Zuverlässigkeit, Verfügbarkeit, Instandhaltbarkeit und of Reliability, Availability, Maintainability and Safety (RAMS)
Sicherheit (RAMS) - Teil 1: Generischer RAMS Prozess - Part 1: Generic RAMS Process
La présente Norme Européenne a été adoptée par le CENELEC le 2017-07-03. Les membres du CENELEC sont tenus de se soumettre au
Règlement Intérieur du CEN/CENELEC, qui définit les conditions dans lesquelles doit être attribué, sans modification, le statut de norme
nationale à cette Norme Européenne.
Les listes mises à jour et les références bibliographiques relatives à ces normes nationales peuvent être obtenues auprès du CEN-
CENELEC Management Centre ou auprès des membres du CENELEC.
La présente Norme Européenne existe en trois versions officielles (allemand, anglais, français). Une version dans une autre langue faite par
traduction sous la responsabilité d'un membre du CENELEC dans sa langue nationale, et notifiée au CEN-CENELEC Management Centre,
a le même statut que les versions officielles.
Les membres du CENELEC sont les comités électrotechniques nationaux des pays suivants: Allemagne, Ancienne République yougoslave
de Macédoine, Autriche, Belgique, Bulgarie, Chypre, Croatie, Danemark, Espagne, Estonie, Finlande, France, Grèce, Hongrie, Irlande,
Islande, Italie, Lettonie, Lituanie, Luxembourg, Malte, Norvège, Pays-Bas, Pologne, Portugal, République de Serbie, République Tchèque,
Roumanie, Royaume-Uni, Slovaquie, Slovénie, Suède, Suisse et Turquie.


Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
European Committee for Electrotechnical Standardization
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Bruxelles
© 2017 CENELEC Tous droits d'exploitation sous quelque forme et de quelque manière que ce soit réservés dans le monde entier aux
membres du CENELEC.
 Réf. n° EN 50126-1:2017 F

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SIST EN 50126-1:2018
EN 50126-1:2017 (F)
1 Sommaire
2 Page
3 Avant-propos européen. 5
4 Introduction . 6
5 1 Domaine d'application . 7
6 2 Références normatives . 8
7 3 Termes et définitions . 8
8 4 Abréviations . 20
9 5 FDMS dans le domaine ferroviaire . 21
10 5.1 Introduction . 21
11 5.2 Approche en faveur d'un système multiniveaux . 22
12 5.2.1 Concepts de hiérarchie du système . 22
13 5.2.2 Exigences et caractéristiques du système . 23
14 5.2.3 Définition d'un système . 24
15 5.3 Vue d'ensemble du système ferroviaire . 24
16 5.3.1 Introduction . 24
17 5.3.2 Parties prenantes impliquées dans un système ferroviaire . 24
18 5.3.3 Structure du système ferroviaire et allocation des exigences de FDMS . 25
19 5.4 FDMS dans le domaine ferroviaire et qualité de service . 25
20 5.5 Composantes de la FDMS dans le domaine ferroviaire . 26
21 5.6 Facteurs d'influence de la FDMS dans le domaine ferroviaire . 28
22 5.6.1 Généralités . 28
23 5.6.2 Types de défaillances . 28
24 5.6.3 Détermination de l'ensemble des facteurs d'influence spécifiques au domaine
25 ferroviaire . 29
26 5.6.4 Facteurs humains . 33
27 5.7 Spécification des exigences de FDMS ferroviaires . 35
28 5.7.1 Généralités . 35
29 5.7.2 Spécification de la FDMS . 36
30 5.8 Approche basée sur le risque . 36
31 5.9 Stratégie de réduction des risques . 36
32 5.9.1 Introduction . 36
33 5.9.2 Réduction des risques relatifs à la sécurité . 37
34 5.9.3 Réduction des risques relatifs à la FDM . 37
35 6 Management de la FDMS dans le domaine ferroviaire – Exigences générales . 38
36 6.1 Introduction . 38
37 6.2 Cycle de vie pour le système en cours d'examen . 39
38 6.3 Appréciation du risque . 48
39 6.4 Exigences organisationnelles . 49
40 6.4.1 Introduction . 49
41 6.4.2 Exigences . 50
42 6.5 Application de la présente norme et adaptabilité au domaine d'application et à la
43 taille du projet . 50
44 6.5.1 Exigences générales . 50
45 6.5.2 Cas de systèmes complexes avec différents niveaux hiérarchiques . 52
46 6.5.3 Rénovation au sein de systèmes existants . 53
47 6.5.4 Réutilisation ou adaptation d'un système déjà accepté . 53
48 6.6 Exigences générales relatives à la documentation FDMS . 54
49 6.7 Vérification et validation . 55
50 6.7.1 Introduction . 55
51 6.7.2 Vérification . 55
52 6.7.3 Validation . 56
53 6.8 Evaluation indépendante de la sécurité . 57
54 6.8.1 Objectifs . 57
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55 6.8.2 Activités . 57
56 7 Cycle de vie FDMS . 59
57 7.1 Généralités . 59
58 7.2 Phase 1 : concept. 59
59 7.2.1 Objectifs . 59
60 7.2.2 Activités . 59
61 7.2.3 Livrables . 60
62 7.3 Phase 2 : définition du système et contexte opérationnel . 60
63 7.3.1 Objectifs . 60
64 7.3.2 Activités . 60
65 7.3.3 Livrables . 64
66 7.4 Phase 3 : analyse et évaluation du risque . 65
67 7.4.1 Objectifs . 65
68 7.4.2 Activités . 65
69 7.4.3 Livrables . 69
70 7.5 Phase 4 : Spécification des exigences du système . 69
71 7.5.1 Objectifs . 69
72 7.5.2 Activités . 69
73 7.5.3 Livrables . 71
74 7.5.4 Tâches de validation spécifiques . 71
75 7.6 Phase 5 : architecture et allocation des exigences du système . 72
76 7.6.1 Objectifs . 72
77 7.6.2 Activités . 72
78 7.6.3 Livrables . 73
79 7.7 Phase 6 : Conception et réalisation . 73
80 7.7.1 Objectifs . 73
81 7.7.2 Activités . 74
82 7.7.3 Livrables . 75
83 7.7.4 Tâches de vérification spécifiques . 75
84 7.8 Phase 7 : fabrication . 76
85 7.8.1 Objectifs . 76
86 7.8.2 Activités . 76
87 7.8.3 Livrables . 76
88 7.9 Phase 8 : intégration . 77
89 7.9.1 Objectifs . 77
90 7.9.2 Activités . 77
91 7.9.3 Livrables . 78
92 7.9.4 Tâches de vérification spécifiques . 78
93 7.10 Phase 9 : Validation du système . 79
94 7.10.1 Objectifs . 79
95 7.10.2 Activités . 79
96 7.10.3 Livrables . 79
97 7.11 Phase 10 : acceptation du système . 81
98 7.11.1 Objectifs . 81
99 7.11.2 Activités . 81
100 7.11.3 Livrables . 81
101 7.12 Phase 11 : suivi de l'exploitation, de la maintenance et des performances . 81
102 7.12.1 Objectifs . 81
103 7.12.2 Activités . 82
104 7.12.3 Livrables . 85
105 7.12.4 Tâches de vérification spécifiques . 85
106 7.13 Phase 12 : Retrait du service . 85
107 7.13.1 Objectifs . 85
108 7.13.2 Activités . 86
109 7.13.3 Livrables . 86
110 8 Dossier de sécurité . 86
111 8.1 Objectif d'un dossier de sécurité . 86
112 8.2 Contenu d'un dossier de sécurité . 87
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113 Annexe A (informative) Plan de FDMS . 89
114 A.1 Généralités . 89
115 A.2 Procédure . 89
116 A.3 Exemple de plan de base de FDMS . 89
117 A.4 Liste des techniques. 91
118 Annexe B (informative) Exemples de paramètres applicables au domaine ferroviaire . 95
119 B.1 Généralités . 95
120 B.2 Paramètres de fiabilité . 95
121 B.3 Paramètres de maintenabilité . 96
122 B.4 Paramètres de disponibilité . 96
123 B.5 Paramètres de soutien logistique . 98
124 B.6 Paramètres de sécurité . 98
125 Annexe C (informative) Etalonnage de la matrice de risque et catégories d'acceptation du
126 risque . 99
127 C.1 Généralités . 99
128 C.2 Catégories de fréquence d'occurrence . 99
129 C.3 Catégories de gravité . 101
130 C.4 Catégories d'acceptation du risque . 102
131 Annexe D (informative) Lignes directrices relatives à la définition du système . 105
132 D.1 Généralités . 105
133 D.2 Définition du système dans une approche itérative du système . 105
134 D.3 Méthode de définition de la structure d'un système . 105
135 D.3.1 Généralités . 105
136 D.3.2 Liste de fonctions . 105
137 D.3.3 Décomposition fonctionnelle . 105
138 D.4 Parties/parties prenantes/limites des systèmes . 106
139 D.5 Lignes directrices relatives au contenu d'une définition du système . 106
140 Annexe ZZ (informative) Relation entre la présente Norme européenne et les exigences
141 essentielles concernées de la Directive européenne 2008/57/CE . 108
142 Bibliographie . 113
143
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EN 50126-1:2017 (F)
144 Avant-propos européen
145 Le présent document (EN 50126-1:2017) a été préparé par le Comité Technique CLC/TC 9X
146 « Applications électriques et électroniques dans le domaine ferroviaire ».
147 Les dates suivantes sont fixées :
• date limite à laquelle ce document doit être mis (dop) 2018-07-03
en application au niveau national par publication
d'une norme nationale identique ou par
entérinement
• date limite à laquelle les normes nationales en (dow) 2020-07-03
contradiction avec ce document doivent être
annulées
148 Le présent document remplace l'EN 50126-1:1999 qui a été révisée techniquement.
149 L’attention est attirée sur le fait que certains des éléments du présent document peuvent faire l’objet de
150 droits attachés à des brevets. Le CENELEC ne saurai(en)t être tenu(s) pour responsable(s) de ne pas
151 avoir identifié tout ou partie de tels droits attachés à des brevets.
152 L'EN 50126 « Applications ferroviaires — Spécification et démonstration de la fiabilité, de la
153 disponibilité, de la maintenabilité et de la sécurité (FDMS) » comprend les parties suivantes :
154 — Partie 1 : Processus FDMS générique ;
155 — Partie 2 : Approche systématique pour la sécurité.
156 Le présent document a été élaboré dans le cadre d'un mandat confié au CENELEC par la Commission
157 européenne et l'Association européenne de libre-échange et couvre les exigences essentielles de la
158 (des) directive(s) UE.
159 Pour la relation avec la (les) Directive(s) UE, voir l'Annexe ZZ, informative, qui fait partie intégrante du
160 présent document.
5

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161 Introduction
162 L'EN 50126-1:1999 visait à introduire l'application d'un processus systématique de management de la
163 FDMS dans le domaine ferroviaire. L'application de cette norme et l'expérience acquise au cours de ces
164 dernières années ont révélé la nécessité de mettre en œuvre une démarche de révision et de
165 restructuration avec la volonté d'établir une approche systématique et cohérente de la FDMS, applicable
166 à tous les domaines d'application ferroviaire : Contrôle-commande et Signalisation (Signalisation),
167 Matériel Roulant et Alimentation Electrique (Installations Fixes).
168 Le travail de révision a permis d'améliorer la cohérence et l'homogénéité de la norme, du concept de
169 management de la sécurité et de la mise en application de l'EN 50126 en tenant également compte des
170 Rapports Techniques associés existants.
171 La présente Norme européenne fournit aux sociétés d'exploitation ferroviaire et aux industries
172 ferroviaires de l'ensemble de l'Union européenne un processus permettant de mettre en œuvre une
173 démarche cohérente de management de la fiabilité, de la disponibilité, de la maintenabilité et de la
174 sécurité, désignée par l'acronyme FDMS.
175 Les processus relatifs à la spécification et à la démonstration des exigences de FDMS sont les pierres
176 angulaires de la présente norme. La présente Norme européenne encourage une vision et une
177 démarche communes de management de la FDMS.
178 L'EN 50126 représente une partie de l'application spécifique au domaine ferroviaire de l'IEC 61508. La
179 satisfaction aux exigences de la présente Norme européenne ainsi qu'aux exigences d'autres normes
180 pertinentes suffit ; il n'est pas nécessaire de démontrer en plus la conformité à l'IEC 61508.
181 En ce qui concerne la sécurité, l’EN 50126-1 fournit un processus de management de la sécurité étayé
182 par les lignes directrices et les méthodes décrites dans l’EN 50126-2.
183 L’EN 50126-1 et le l’EN 50126-2 ne sont pas liés à la technologie utilisée. En ce qui concerne la
184 sécurité, l'EN 50126 adopte la perspective de la sécurité avec une approche fonctionnelle.
185 L'application de la présente norme peut être adaptée aux exigences spécifiques pour le système en
186 cours d'examen.
187 La présente Norme européenne peut être systématiquement appliquée par les sociétés d'exploitation et
188 les industries ferroviaires tout au long des phases du cycle de vie d'une application ferroviaire afin de
189 développer des exigences de FDMS spécifiques au domaine ferroviaire et de satisfaire à ces exigences.
190 L'approche système définie par la présente Norme européenne facilite l'appréciation des interactions
191 relatives à la FDMS entre les éléments des applications ferroviaires, même si elles sont complexes.
192 La présente Norme européenne promeut la synergie entre les parties prenantes du domaine ferroviaire
193 afin de parvenir au meilleur compromis entre les performances de FDMS et les coûts des applications
194 f
...

SLOVENSKI STANDARD
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01-november-2015
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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,
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Ta slovenski standard je istoveten z: prEN 50126-1:2015
ICS:
45.020 Železniška tehnika na Railway engineering in
splošno general
oSIST prEN 50126-1:2015 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 50126-1:2015

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oSIST prEN 50126-1:2015

EUROPEAN STANDARD DRAFT
prEN 50126-1
NORME EUROPÉENNE

EUROPÄISCHE NORM

August 2015
ICS 29.280; 45.020 Will supersede EN 50126-1:1999
English Version
Railway Applications - The Specification and Demonstration of
Reliability, Availability, Maintainability and Safety (RAMS) - Part
1: Generic RAMS Process
Applications ferroviaires ¿ Spécification et démonstration de Bahnanwendungen - Spezifikation und Nachweis von
la fiabilité, de la disponibilité, de la maintenabilité et de la Zuverlässigkeit, Verfügbarkeit, Instandhaltbarkeit und
sécurité (FDMS) - Partie 1: Processus FMDS générique Sicherheit (RAMS) - Teil 1: Generischer RAMS Prozess
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2015-12-04.

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.



European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 60236 Ref. No. prEN 50126-1:2015 E

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oSIST prEN 50126-1:2015
prEN 50126-1:2015 (E)
1 Contents Page
2 European foreword . 6
3 Introduction . 7
4 1 Scope . 8
5 2 Normative references . 9
6 3 Terms and definitions . 9
7 4 Abbreviations . 17
8 5 Railway RAMS . 18
9 5.1 Introduction . 18
10 5.2 System-level approach . 18
11 5.2.1 Concepts of system hierarchy . 18
12 5.2.2 System’s requirements and characteristics . 19
13 5.2.3 Defining a system . 20
14 5.3 Railway system overview . 21
15 5.3.1 Introduction . 21
16 5.3.2 Bodies/entities involved in a railway system . 21
17 5.3.3 Railway system environment and the balance of requirements . 21
18 5.3.4 Railway system structure and apportionment of RAMS requirements . 22
19 5.4 Railway RAMS and quality of service . 22
20 5.5 Elements of railway RAMS . 22
21 5.6 Factors influencing railway RAMS . 23
22 5.6.1 General . 23
23 5.6.2 Classes of failures . 24
24 5.6.3 Derivation of detailed railway specific influencing factors . 24
25 5.6.4 Human factors . 26
26 5.6.5 Evaluation of factors . 28
27 5.7 Specification of railway RAMS requirements . 28
28 5.7.1 General . 28
29 5.7.2 RAMS specification . 28
30 5.8 Risk based approach . 28
31 5.9 Risk reduction strategy . 29
32 5.9.1 Introduction . 29
33 5.9.2 Reduction of risks related to safety . 30
34 6 Management of Railway RAMS – General Requirements . 30
35 6.1 Process overview . 30
36 6.2 Risk Assessment . 43
37 6.3 Organisational requirements . 45
38 6.3.1 General . 45
39 6.3.2 Independence of Roles . 45
40 6.4 Application of this standard and Adaptability to project scope and size . 45
41 6.4.1 General Rules . 45
42 6.4.2 Case of complex systems with different hierarchical levels. 47
43 6.4.3 Renewal with existing systems . 48
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44 6.4.4 Re-use or adaptation of a system with previous acceptance, including
45 specific application of a defined Generic Product / Application . 48
46 6.5 General requirements on RAMS documentation . 48
47 6.6 Verification and Validation . 49
48 6.6.1 Introduction . 49
49 6.6.2 Verification. 49
50 6.6.3 Validation . 49
51 6.7 Safety Assessment . 51
52 6.7.1 Objectives . 51
53 6.7.2 Activities . 51
54 7 RAMS life-cycle . 52
55 7.1 General . 52
56 7.2 Phase 1: Concept . 53
57 7.2.1 Objectives . 53
58 7.2.2 Activities . 53
59 7.2.3 Deliverables . 53
60 7.2.4 Specific verification tasks . 53
61 7.2.5 Specific validation tasks . 53
62 7.3 Phase 2: System definition and operational context . 53
63 7.3.1 Objectives . 53
64 7.3.2 Activities . 53
65 7.3.3 Deliverables . 57
66 7.3.4 Specific verification tasks . 57
67 7.3.5 Specific validation tasks . 57
68 7.4 Phase 3: Risk analysis and evaluation . 57
69 7.4.1 Objectives . 57
70 7.4.2 Activities . 58
71 7.4.3 Deliverables . 60
72 7.4.4 Specific verification tasks . 61
73 7.4.5 Specific validation tasks . 61
74 7.5 Phase 4: Specification of system requirements . 61
75 7.5.1 Objectives . 61
76 7.5.2 Activities . 61
77 7.5.3 Deliverables . 62
78 7.5.4 Specific verification tasks . 62
79 7.5.5 Specific validation tasks . 62
80 7.6 Phase 5: Architecture and apportionment of system requirements . 62
81 7.6.1 Objectives . 62
82 7.6.2 Activities . 62
83 7.6.3 Deliverables . 63
84 7.6.4 Specific verification tasks . 63
85 7.6.5 Specific validation tasks . 64
86 7.7 Phase 6: Design and implementation . 64
87 7.7.1 Objectives . 64
88 7.7.2 Activities . 64
89 7.7.3 Deliverables . 64
90 7.7.4 Specific verification tasks . 65
91 7.7.5 Specific validation tasks . 65
92 7.8 Phase 7: Manufacture . 65
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93 7.8.1 Objectives . 65
94 7.8.2 Activities . 65
95 7.8.3 Deliverables . 65
96 7.8.4 Specific verification tasks . 65
97 7.8.5 Specific validation tasks . 66
98 7.9 Phase 8: Integration . 66
99 7.9.1 Objectives . 66
100 7.9.2 Activities . 66
101 7.9.3 Deliverables . 66
102 7.9.4 Specific verification tasks . 67
103 7.9.5 Specific validation tasks . 67
104 7.10 Phase 9: System Validation . 67
105 7.10.1 Objectives . 67
106 7.10.2 Activities . 67
107 7.10.3 Deliverables . 67
108 7.10.4 Specific verification tasks . 67
109 7.10.5 Specific validation tasks . 67
110 7.11 Phase 10: System acceptance . 68
111 7.11.1 Objectives . 68
112 7.11.2 Activities . 68
113 7.11.3 Deliverables . 68
114 7.11.4 Specific verification tasks . 68
115 7.11.5 Specific validation tasks . 68
116 7.12 Phase 11: Operation, maintenance and performance monitoring . 68
117 7.12.1 Objectives . 68
118 7.12.2 Activities . 68
119 7.12.3 Deliverables . 71
120 7.12.4 Specific verification tasks . 71
121 7.12.5 Specific validation tasks . 71
122 7.13 Phase 12: Decommissioning . 71
123 7.13.1 Objectives . 71
124 7.13.2 Activities . 71
125 7.13.3 Deliverables . 71
126 7.13.4 Specific verification tasks . 71
127 7.13.5 Specific validation tasks . 72
128 8 Safety Case. . 72
129 8.1 Purpose of a safety case . 72
130 8.2 Types of safety case . 72
131 8.3 Responsibility in managing the Safety Case . 73
132 8.4 General content of a Safety Case . 73
133 Annex A (informative) RAMS plan . 75
134 Annex B (informative) Examples of parameters for railway . 80
135 B.1 General . 80
136 B.2 Reliability parameters . 80
137 B.3 Maintainability parameters . 80
138 B.4 Availability parameters. 81
139 B.5 Logistic support parameters . 82
140 B.6 Safety parameters . 83
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141 Annex C (intentionally left blank) . 84
142 Annex D (informative) Risk matrix calibration and risk acceptance categories . 85
143 D.1 General . 85
144 D.2 Frequency of occurrence levels . 85
145 D.3 Severity levels . 87
146 D.4 Risk acceptance categories . 88
147 Annex E (informative) Guidance on system definition . 90
148 E.1 General . 90
149 E.2 System Definition in an iterative system approach . 90
150 E.3 Method for defining the structure of a system. 90
151 E.4 Parties/stakeholders/boundaries of systems . 91
152 E.5 Guidance on the content of a system definition . 91
153 Bibliography . 92
154
155
156 Table 1 — RAMS tasks along life-cycle phases . 35
157 Table 2 — RAMS deliverables along life-cycle phases . 40
158 Table A.1 – Example of a basic RAMS plan outline . 76
159 Table B.1 – Examples of reliability parameters . 80
160 Table B.2 – Examples of maintainability parameters . 80
161 Table B.3 – Examples of availability parameters . 81
162 Table B.4 – Examples of logistic support parameters . 82
163 Table B.5 – Examples of safety performance parameters . 83
164 Table D.1 – Frequency of occurrence of events with examples for quantification (time
165
based) . 86
166 Table D.2 – Frequency of occurrence of events with examples for quantification (distance based) . 87
167
Table D.3 – Severity categories (example related to RAM) . 87
168 Table D.4 – Severity categories (example 1 related to RAMS) . 87
169
Table D.5 – Categories (example 2 related to Safety). 88
170 Table D.6 – Financial severity levels (example) . 88
171
Table D.7 – Risk acceptance categories (example 1 for binary decisions) . 88
172 Table D.8 – Risk acceptance categories (example 2) . 88
173
Table D.9 – Risk acceptance categories (example related to safety) . 89
174 Table E.1 – Typical examples for a functional breakdown . 91
175
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176 European foreword
177 This document (prEN 50126-1:2015) has been prepared by CLC/TC 9X "Electrical and electronic
178 applications for railways".
179
180 This document is currently submitted to the Enquiry.
181
182 The following dates are proposed:
183
(doa) dor + 6 months
• latest date by which the existence of
this document has to be announced
at national level
(dop) dor + 12 months
• latest date by which this document has to b
e implemented at national level by
publication of an identical national standard
or by endorsement
• latest date by which the national standards (dow) dor + 36 months
(to be confirmed or
conflicting with this document have to
be withdrawn modified when voting)
184
185 This document will supersede EN 50126-1:1999 and CLC/TR 50126-3:2008.
186
187 EN 50126 "Railway applications – The specification and demonstration of Reliability,
188 Availability, Maintainability and Safety (RAMS)" consists of the following parts:
189 – Part 1: Generic RAMS process;
190 – Part 2: Systems approach to safety;
191
192 This document has been prepared under a mandate given to CENELEC by the European Commission
193 and the European Free Trade Association, and supports essential requirements of EU Directive(s).
194
195 For the relationship with EU Directive(s) see informative Annex ZZ, which is an integral part of this
196 document.
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197 Introduction
198 EN 50126-1:1999 was aimed at introduce the application of a systematic RAMS management
199 process in the railway sector. Through the application of these standards and the experiences
200 gained over the last years, the need for revision and restructuring became apparent with a need
201 to deliver a systematic and coherent approach to RAMS applicable to all the railway application
202 fields Signalling, Rolling Stock and Electric power supply for Railways (Fixed Installations).
203 The revision work improved the coherency and consistency of the standards, the concept of
204 safety management and the practical usage of EN 50126 and took into consideration the
205 existing and related Technical Reports as well.
206 This European Standard provides railway duty holders and the railway suppliers, throughout the
207 European Union, with a process which will enable the implementation of a consistent approach
208 to the management of reliability, availability, maintainability and safety, denoted by the acronym
209 RAMS.
210 Processes for the specification and demonstration of RAMS requirements are cornerstones of
211 this standard. This European Standard promotes a common understanding and approach to the
212 management of RAMS.
213 EN 50126 is the railway sector specific application of EN 61508. Meeting the requirements in
214 this European Standard is sufficient to ensure that additional compliance to EN 61508 does not
215 need to be demonstrated.
216 With regard to safety EN 50126-1 provides a Safety Management Process which is supported
217 by guidance and methods described in EN 50126-2.
218 EN 50126-1 and EN 50126-2 are independent from the technology used. As far as safety is
219 concerned, EN 50126 takes the perspective of functional safety. This does not exclude other
220 aspects of safety. However, these are not the focus.
221 The application of this standard should be adapted to the specific requirements of the system
222 under consideration.
223 This European Standard can be applied systematically by the railway duty holders and railway
224 suppliers, throughout all phases of the life-cycle of a railway application, to develop railway
225 specific RAMS requirements and to achieve compliance with these requirements. The systems-
226 level approach developed by this European Standard facilitates assessment of the RAMS
227 interactions between elements of railway applications even if they are of complex nature.
228 This European Standard promotes co-operation between the stakeholders of Railways in the
229 achievement of an optimal combination of RAMS and cost for railway applications. Adoption of
230 this European Standard will support the principles of the European Single Market and facilitate
231 European railway inter-operability.
232 The process defined by this European Standar
...

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