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    IEC 61226-2009 Nuclear power plants - Instrumentation and control important to safety - Classification of instrumentation and control functions《核电站.重要安全性仪器仪表.仪器仪表和控制功能分级》.pdf

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    IEC 61226-2009 Nuclear power plants - Instrumentation and control important to safety - Classification of instrumentation and control functions《核电站.重要安全性仪器仪表.仪器仪表和控制功能分级》.pdf

    1、 IEC 61226Edition 3.0 2009-07INTERNATIONAL STANDARD NORME INTERNATIONALENuclear power plants Instrumentation and control important to safety Classification of instrumentation and control functions Centrales nuclaires de puissance Instrumentation et contrle-commande importants pour la sret Classement

    2、 des fonctions dinstrumentation et de contrle-commande IEC61226:2009 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2009 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, electronic or m

    3、echanical, including photocopying and microfilm, without permission in writing from either IEC or IECs member National Committee in the country of the requester. If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication, please contact the

    4、 address below or your local IEC member National Committee for further information. Droits de reproduction rservs. Sauf indication contraire, aucune partie de cette publication ne peut tre reproduite ni utilise sous quelque forme que ce soit et par aucun procd, lectronique ou mcanique, y compris la

    5、photocopie et les microfilms, sans laccord crit de la CEI ou du Comit national de la CEI du pays du demandeur. Si vous avez des questions sur le copyright de la CEI ou si vous dsirez obtenir des droits supplmentaires sur cette publication, utilisez les coordonnes ci-aprs ou contactez le Comit nation

    6、al de la CEI de votre pays de rsidence. IEC Central Office 3, rue de Varemb CH-1211 Geneva 20 Switzerland Email: inmailiec.ch Web: www.iec.ch About the IEC The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards for a

    7、ll electrical, electronic and related technologies. About IEC publications The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the latest edition, a corrigenda or an amendment might have been published. Catalogue of IEC publications: www

    8、.iec.ch/searchpub The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,). It also gives information on projects, withdrawn and replaced publications. IEC Just Published: www.iec.ch/online_news/justpub Stay up to date on all new IEC pub

    9、lications. Just Published details twice a month all new publications released. Available on-line and also by email. Electropedia: www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions in English and French, with

    10、 equivalent terms in additional languages. Also known as the International Electrotechnical Vocabulary online. Customer Service Centre: www.iec.ch/webstore/custserv If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service Centre FAQ or co

    11、ntact us: Email: csciec.ch Tel.: +41 22 919 02 11 Fax: +41 22 919 03 00 A propos de la CEI La Commission Electrotechnique Internationale (CEI) est la premire organisation mondiale qui labore et publie des normes internationales pour tout ce qui a trait llectricit, llectronique et aux technologies ap

    12、parentes. A propos des publications CEI Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possdez ldition la plus rcente, un corrigendum ou amendement peut avoir t publi. Catalogue des publications de la CEI: www.iec.ch/searchpub/cur_fut-f.htm Le Ca

    13、talogue en-ligne de la CEI vous permet deffectuer des recherches en utilisant diffrents critres (numro de rfrence, texte, comit dtudes,). Il donne aussi des informations sur les projets et les publications retires ou remplaces. Just Published CEI: www.iec.ch/online_news/justpub Restez inform sur les

    14、 nouvelles publications de la CEI. Just Published dtaille deux fois par mois les nouvelles publications parues. Disponible en-ligne et aussi par email. Electropedia: www.electropedia.org Le premier dictionnaire en ligne au monde de termes lectroniques et lectriques. Il contient plus de 20 000 termes

    15、 et dfinitions en anglais et en franais, ainsi que les termes quivalents dans les langues additionnelles. Egalement appel Vocabulaire Electrotechnique International en ligne. Service Clients: www.iec.ch/webstore/custserv/custserv_entry-f.htm Si vous dsirez nous donner des commentaires sur cette publ

    16、ication ou si vous avez des questions, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 61226Edition 3.0 2009-07INTERNATIONAL STANDARD NORME INTERNATIONALENuclear power plants Instrumentation and control important to safety Classif

    17、ication of instrumentation and control functions Centrales nuclaires de puissance Instrumentation et contrle-commande importants pour la sret Classement des fonctions dinstrumentation et de contrle-commande INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE VICS 27.

    18、120.20 PRICE CODECODE PRIXISBN 2-8318-1052-1 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 2 61226 IEC:2009 CONTENTS FOREWORD.3 INTRODUCTION.5 1 Scope.8 2 Normative references .8 3 Terms and definitions .9 4 Abbrev

    19、iations .13 5 Classification scheme.13 5.1 General .13 5.2 Background .14 5.3 Description of categories.14 5.3.1 General .14 5.3.2 Category A 15 5.3.3 Category B 15 5.3.4 Category C 15 5.4 Assignment criteria16 5.4.1 General .16 5.4.2 Category A 16 5.4.3 Category B 16 5.4.4 Category C 17 6 Classific

    20、ation procedure .17 6.1 General .17 6.2 Identification of design basis .18 6.3 Identification and classification of functions.18 7 Assignment of technical requirements to categories .21 7.1 General requirements21 7.2 Requirements related to functions .21 7.2.1 Basic requirements21 7.2.2 Specific req

    21、uirements 22 7.3 Requirements related to I any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely wit

    22、h the International Organization for Standardization (ISO) in accordance with conditions determined by agreement 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 subj

    23、ects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications 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

    24、 content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for 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 p

    25、ossible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any eq

    26、uipment declared to be in conformity with an IEC Publication. 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

    27、 IEC 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) At

    28、tention 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.

    29、 IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61226 has been prepared by subcommittee 45A: Instrumentation and control of nuclear facilities, of IEC technical committee 45: Nuclear instrumentation. This third edition cancels and replaces

    30、 the second edition published in 2005 and constitutes a technical revision. The main changes with respect to the previous edition are listed below: to introduce a definition for “non-hazardous stable state”; to clarify limits of categories; to clarify requirements related to equipment used for beyon

    31、d design events. 4 61226 IEC:2009 The text of this standard is based on the following documents: FDIS Report on voting 45A/745/FDIS 45A/767/RVDFull 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

    32、 drafted in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this dat

    33、e, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 61226 IEC:2009 5 INTRODUCTION a) Technical background, main issues and organisation of the standard This International Standard responds to an International Atomic Energy Agency (IAEA) requirement1to classi

    34、fy nuclear power plants instrumentation and control systems according to their importance to safety. With distributed computer based I assign specification and design requirements to I b) the consequences of failure to perform the function; c) the probability that it (the I d) the time following a P

    35、IE at which, or the period throughout which it (the I b) those structures, systems and components that prevent anticipated operational occurrences from leading to accident conditions; c) those features which are provided to mitigate the consequences of malfunction or failure of structures, systems o

    36、r components. IAEA Safety Glossary: 2007 NOTE Items important to safety considered in this standard are mainly I the time for which alternative actions can be taken; the timeliness by which hidden faults can be detected and remedied. This standard extends the classification strategy presented in IAE

    37、A Safety Guide NS-G-1.3, and establishes the criteria and methods to be used to assign the I b) functions, the failure or spurious actuation of which would lead to unacceptable consequences, and for which no other category A function exists that prevents the unacceptable consequences; c) functions r

    38、equired to provide information and control capabilities that allow specified manual actions necessary to reach the non-hazardous stable state. 5.4.3 Category B An I b) functions required to provide information or control capabilities that allow specified manual actions necessary after the non-hazard

    39、ous stable state has been reached to prevent a DBE from leading to unacceptable consequences, or mitigate the consequences; c) functions, the failure of which during normal operation, would require the operation of a category A function to prevent an accident whose study is required; d) functions to

    40、 reduce considerably the frequency of a DBE as claimed in the safety analysis; e) plant process control functions operating so that the main process variables are maintained within the limits assumed in the safety analysis, if these control functions are the only means of control of these variables.

    41、 If different means are provided, clause 5.4.4 a) may apply; f) functions used to prevent or mitigate a radioactive release or fuel degradation outside of the limits and conditions of normal operation as defined in the safety analysis; NOTE 1 This refers to functions that are not already covered by

    42、the analysis of DBE leading to category A classification. 61226 IEC:2009 17 g) functions that provide continuous or intermittent tests or monitoring of functions in category A to indicate their continued availability for operation and alert control room staff to their failures, if no alternative mea

    43、ns (e.g. periodic tests) are provided to verify their availability4. NOTE 2 Where the monitoring function is the only means of detecting otherwise unrevealed failures, then assigning the function to category B ensures that the equipment providing the function is suitably qualified. 5.4.4 Category C

    44、An I NOTE 1 According to national practices a possible acceptable application of clause 5.4.4 a) is the combination of a regulation function and suitable manual actuation based on independent alarms including a justification of the use of manual action. b) functions used to prevent or mitigate a min

    45、or radioactive release, or minor degradation of fuel, within the NPP design basis; NOTE 2 A minor release or minor fuel degradation is considered to be that which falls within the normal limits and conditions of operation (e.g. discharge limits). c) functions that provide continuous or intermittent

    46、tests or monitoring of functions in category A and B to indicate their continued availability for operation and alert control room staff to their failures, and are not classified category B according to 5.4.3 g); d) functions necessary to reach the safety probabilistic goals including those to reduc

    47、e the expected frequency of a DBE; e) functions to reduce the demands on a category A function, as claimed in the safety analysis; f) functions to monitor and take mitigating action following internal hazards within the NPP design basis (e.g. fire, flood); g) functions to warn personnel or to ensure

    48、 personnel safety during or following events that involve or result in release of radioactivity in the NPP, or risk of radiation exposure; h) functions to monitor and take mitigating action following natural events (e.g. seismic disturbance, extreme wind); i) functions provided for the benefit of th

    49、e accident management strategy to reach and maintain a safe state for beyond design accidents; j) functions provided to minimise the consequences of severe accidents; k) functions which provide access control for the NPP. 6 Classification procedure 6.1 General An outline of the procedure is shown in Figure 1. 4 Subclause 4.2.6 of IEC 60671 provides further guidance on the class of equipment used to implement such f


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