EN 62741-2015 en Demonstration of dependability requirements - The dependability case.pdf

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1、BSI Standards PublicationDemonstration of dependabilityrequirements The dependabilitycaseBS EN 62741:2015National forewordThis British Standard is the UK implementation of EN 62741:2015. It is identical to IEC 62741:2015. It supersedes BS 5760-18:2010, which will bewithdrawn on 24 March 2018.The UK

2、participation in its preparation was entrusted to TechnicalCommittee DS/1, Dependability.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for

3、its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 80390 1ICS 03.120.01; 21.020; 29.020Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStan

4、dards Policy and Strategy Committee on 31 May 2015.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 62741:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 62741 March 2015 ICS 21.020; 03.120.01 English Version Demonstration of dependability requirements -

5、 The dependability case (IEC 62741:2015) Dmonstration des exigences de sret de fonctionnement - Argumentaire dans le cadre de la sret de fonctionnement (IEC 62741:2015) Leitfaden zur Darlegung von Zuverlssigkeitsanforderungen - Der Zuverlssigkeitsnachweis (IEC 62741:2015) This European Standard was

6、approved by CENELEC on 2015-03-24. 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

7、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 i

8、ts 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 Mace

9、donia, 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. European Committee for Electrotechnical Standardization Comit Eur

10、open de Normalisation Electrotechnique Europisches Komitee fr 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. Ref. No. EN 62741:2015 E BS EN 62741:2

11、015EN 62741:2015 - 2 - Foreword The text of document 56/1591/FDIS, future edition 1 of IEC 62741, prepared by IEC/TC 56 “Dependability“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 62741:2015. The following dates are fixed: latest date by which the document has to be

12、implemented at national level by publication of an identical national standard or by endorsement (dop) 2015-12-24 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2018-03-24 Attention is drawn to the possibility that some of the elements of this do

13、cument may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 62741:2015 was approved by CENELEC as a European Standard without any modification. In the officia

14、l version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60300-3-1 NOTE Harmonized as EN 60300-3-1. IEC 60300-3-4 NOTE Harmonized as EN 60300-3-4. IEC 61078 NOTE Harmonized as EN 61078. IEC 62347 NOTE Harmonized as EN 62347. IEC/ISO 31010 NOTE Harmonized as

15、EN 31010. IEC 62198 NOTE Harmonized as EN 62198. BS EN 62741:2015- 3 - EN 62741:2015 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and ar

16、e indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod),

17、 the relevant EN/HD applies. NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu. Publication Year Title EN/HD Year IEC 60050-192 - International electrotechnical vocabulary - Part 192: Dependability - - IEC 60300-1 -

18、Dependability management - Part 1: Guidance for management and application EN 60300-1 - ISO 31000 - Risk management - Principles and guidelines - - BS EN 62741:2015 2 IEC 62741:2015 IEC 2015 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope 7 2 Normative references 7 3 Terms, definitions and abbreviati

19、ons . 7 3.1 Terms and definitions 7 3.2 Abbreviations 8 4 Background to the dependability case . 8 4.1 Principles and purpose . 8 4.2 Relationship between the dependability case and dependability plans 9 4.3 Progressive assurance of dependability 10 5 Principles of the dependability case . 11 5.1 De

20、scription of the dependability case 11 5.2 Making claims in the dependability case . 12 5.3 Using evidence in the dependability case 13 5.4 Evidence framework 14 5.5 Dependability case report . 16 6 Development of the dependability case 16 6.1 General . 16 6.2 Preparation of the dependability case .

21、 17 6.3 Concept stage . 18 6.4 Development stage . 19 6.5 Realization stage 19 6.6 Utilization stage 20 6.7 Enhancement stage 20 6.8 Retirement stage 20 7 Assessing the adequacy of evidence . 21 Annex A (informative) Evidence framework 22 A.1 General . 22 A.2 Abbreviations used only in this annex .

22、23 Annex B (informative) General requirements for the dependability case report . 40 B.1 General . 40 B.2 Elements required for the dependability case report 40 B.3 Context and assumptions 40 B.3.1 Stakeholders . 40 B.3.2 System description 41 B.3.3 Dependability requirements . 41 B.3.4 Limitations

23、on use . 41 B.3.5 Assumptions 41 B.4 Risks 41 B.5 Dependability plan 42 B.6 The evidence framework . 42 B.7 Body of evidence 42 B.8 Review of evidence to date . 42 B.9 Dependability claims and argument . 42 BS EN 62741:2015IEC 62741:2015 IEC 2015 3 B.10 Conclusions and recommendations . 42 Annex C (

24、informative) Checklist of points for assessing the adequacy of evidence 44 Bibliography 45 Figure 1 Illustration of progressive assurance process . 11 Figure 2 The development of claims . 12 Figure 3 Establishment and development of the evidence framework . 15 Table A.1 Evidence framework for system

25、 “X” 24 Table A.2 Evidence framework for system Y 28 BS EN 62741:2015 4 IEC 62741:2015 IEC 2015 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ DEMONSTRATION OF DEPENDABILITY REQUIREMENTS THE DEPENDABILITY CASE FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization f

26、or standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publi

27、shes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may p

28、articipate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement

29、 between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publi

30、cations have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or f

31、or any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the correspo

32、nding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

33、 services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IE

34、C National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Atten

35、tion is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IE

36、C shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62741 has been prepared by IEC technical committee 56: Dependability. The text of this standard is based on the following documents: FDIS Report on voting 56/1591/FDIS 56/1609/RVD Full informati

37、on on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. BS EN 62741:2015IEC 62741:2015 IEC 2015 5 The committee has decided that the contents of this pub

38、lication will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. BS EN 62741:2015 6 IEC 62741:20

39、15 IEC 2015 INTRODUCTION Dependability is the ability to perform as and when required. Acceptable levels of dependability are therefore essential for continued performance and optimized life cycle costs. In order to achieve dependability of a system, dependability requirements should be established,

40、 the risks of not meeting them identified and a suitable set of activities developed to meet and demonstrate the requirements and manage the risks. A dependability case provides a convenient and convincing means of recording the output of these activities in a single location and presenting an argum

41、ent, supported by evidence, that risks have been treated and that the necessary dependability has been or will be achieved and will continue to be achieved over time. It serves as the main means of communication on dependability among customers, suppliers and other stakeholders and promotes cooperat

42、ion among them. This is essential for dependability achievement and providing assurance as part of the customer/supplier relationship. Preparing a dependability case can also improve dependability through the actions taken to prepare and develop the argument within the dependability case. It can imp

43、rove the cost effectiveness of a dependability programme because if an activity does not provide evidence to support the case, this may indicate that the activity is not necessary. The activities required for the achievement of dependability depend on the nature and development state of the system a

44、nd are likely to vary significantly from one project to another. Throughout this International Standard, the term “dependability“ includes all aspects of reliability, availability, maintainability and supportability, as well as other attributes such as usability, testability and durability. In addit

45、ion, dependability of a system includes all aspects of that system, including components, processes, hardware, software and the interfaces between them. This standard is intended as guidance: the guidelines are not prescriptive in nature, they are generic, they should be tailored to the specific obj

46、ectives and are not exhaustive. This standard does not address safety or the environment. BS EN 62741:2015IEC 62741:2015 IEC 2015 7 DEMONSTRATION OF DEPENDABILITY REQUIREMENTS THE DEPENDABILITY CASE 1 Scope This International Standard gives guidance on the content and application of a dependability

47、case and establishes general principles for the preparation of a dependability case. This standard is written in a basic project context where a customer orders a system that meets dependability requirements from a supplier and then manages the system until its retirement. The methods provided in th

48、is standard may be modified and adapted to other situations as needed. The dependability case is normally produced by the customer and supplier but can also be used and updated by other organizations. For example, certification bodies and regulators may examine the submitted case to support their de

49、cisions and users of the system may update/expand the case, particularly where they use the system for a different purpose. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050-192, International Electrotechnical Vo