1、 IEC 62808 Edition 1.0 2015-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Nuclear power plants Instrumentation and control systems important to safety Design and qualification of isolation devices Centrales nuclaires de puissance Systmes dinstrumentation et de contrle-commande importants pour la sr
2、et Conception et qualification des appareils disolement IEC 62808:2015-05(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2015 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, ele
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20、strumentation and control systems important to safety Design and qualification of isolation devices Centrales nuclaires de puissance Systmes dinstrumentation et de contrle-commande importants pour la sret Conception et qualification des appareils disolement INTERNATIONAL ELECTROTECHNICAL COMMISSION
21、COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 27.120.20 ISBN 978-2-8322-2665-0 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. At
22、tention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 IEC 62808:2015 IEC 2015 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope 7 2 Normative references 7 3 Terms and definitions 7 4 Symbols and abbreviations 8 5 General principles for isolation devices 8 5.1
23、General . 8 5.2 Isolation characteristics 9 5.3 Actuation priority . 10 6 Isolation device design requirements . 10 6.1 Requirements on isolation device application 10 6.1.1 Isolation device power . 10 6.1.2 Maximum credible fault 10 6.1.3 Energy limiting devices 11 6.2 Requirements on isolation dev
24、ice design 11 6.2.1 Basic design requirements . 11 6.2.2 Postulated faults 12 6.2.3 Physical component arrangement 12 6.3 Power isolation devices 13 6.3.1 General . 13 6.3.2 Circuit breaker tripped by fault currents . 13 6.3.3 Circuit breaker tripped by fault signals . 13 6.3.4 Input current limiter
25、s 13 6.3.5 Fuses 13 7 Qualification test requirements 13 7.1 General . 13 7.2 Requirements on the test method 14 7.2.1 Test specification . 14 7.2.2 Testing energy limiting devices 14 7.2.3 Qualification test environment 14 7.3 Application specific testing 15 7.3.1 General . 15 7.3.2 Isolation of sa
26、fety circuits from lower class circuits 15 7.3.3 Isolation between redundant safety circuits 15 7.4 Documentation of test requirements and results 15 Bibliography 16 Figure 1 Application of maximum credible fault 11 Figure 2 Application of postulated fault 12 IEC 62808:2015 IEC 2015 3 INTERNATIONAL
27、ELECTROTECHNICAL COMMISSION _ NUCLEAR POWER PLANTS INSTRUMENTATION AND CONTROL SYSTEMS IMPORTANT TO SAFETY DESIGN AND QUALIFICATION OF ISOLATION DEVICES FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotech
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38、r all such patent rights. International Standard IEC 62808 has been prepared by subcommittee 45A: Instrumentation, control and electrical systems of nuclear facilities, of IEC technical committee 45: Nuclear instrumentation. The text of this standard is based on the following documents: FDIS Report
39、on voting 45A/1004/FDIS 45A/1019/RVD Full information 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. 4 IEC 62808:2015 IEC 2015 The committee has de
40、cided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site 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 amen
41、ded. IEC 62808:2015 IEC 2015 5 INTRODUCTION a) Technical background, main issues and organisation of the standard I in Clause 6: to establish design requirements on the selection and application of suitable isolation devices; in Clause 7: to establish requirements on qualification testing done to va
42、lidate the adequacy of the isolation device design. It is intended that the standard be used by operators of NPPs (utilities), designers of nuclear I&C system and equipment, systems evaluators and regulators. b) Situation of the current standard in the structure of the IEC SC 45A standard series IEC
43、 62808 is the third level IEC SC 45A document tackling the issue of isolation devices. IEC 60709 is directly referenced by IEC 61513 in regard to physical and electrical separation being required between subsystems of different safety trains of I&C systems important to safety, and between I&C system
44、s important to safety and those that are not important to safety. IEC 61226 establishes the principles of categorization of I&C functions, systems and equipment according to their level of importance to safety. It then requires that adequate separation be provided between functions of different cate
45、gories. IEC 61226 refers to IEC 60709 as a normative standard regarding requirements of separation. IEC 62808 is intended to provide requirements and recommendations relating to the design and qualification of isolation devices which are identified in IEC 60709 as a means of achieving independence b
46、etween systems when signals are extracted from a system for use in lower class systems, or between independent subsystems of the same classes. For more details on the structure of the IEC SC 45A standard series, see item d) of this introduction. 6 IEC 62808:2015 IEC 2015 c) Recommendations and limit
47、ations regarding the application of this standard IEC 60709 applies to I&C systems and equipment important to safety. It establishes requirements for physical and electrical separation as one means to provide independence between the functions performed in those systems and equipment. IEC 60709 requ
48、ires the use of isolation devices where connections between independent systems must be made. IEC 62808 provides criteria for the analysis and qualification of the the isolation device. A fundamental criterion for isolation devices is that they be included in, and designed to, the standards of the h
49、igher class system for which they provide protection against hazards. Additional requirements relating to design and qualification of an isolation device as an element of a safety system are not given in this standard. d) Description of the structure of the IEC SC 45A standard series and relationships with other IEC documents and other bodies documents (IAEA, ISO) The top-level document of the IEC SC 45A standard s
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