IEC 62342:2007

IEC 62342
Edition 1.0 2007-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Nuclear power plants – Instrumentation and control systems important to
safety – Management of ageing
Centrales nucléaires de puissance – Systèmes d’instrumentation et de
contrôle-commande importants pour la sûreté – Gestion du vieillissement
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 mechanical, including photocopying and microfilm, without permission in writing from either IEC or
IEC's 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 address below or your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.
Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette
publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: inmail@iec.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 all 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.
ƒ Catalogue of IEC publications: www.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It also gives information on projects, withdrawn and replaced publications.
ƒ IEC Just Published: www.iec.ch/online_news/justpub
Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available
on-line and also by email.
ƒ Electropedia: www.electropedia.org
The world's leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions
in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical
Vocabulary online.
ƒ 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 contact us:
Email: csc@iec.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 première organisation mondiale qui élabore et publie des
normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications CEI
Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possédez
l’édition la plus récente, un corrigendum ou amendement peut avoir été publié.
ƒ Catalogue des publications de la CEI: www.iec.ch/searchpub/cur_fut-f.htm
Le Catalogue en-ligne de la CEI vous permet d’effectuer des recherches en utilisant différents critères (numéro de référence,
texte, comité d’études,…). Il donne aussi des informations sur les projets et les publications retirées ou remplacées.
ƒ Just Published CEI: www.iec.ch/online_news/justpub
Restez informé sur les nouvelles publications de la CEI. Just Published détaille deux fois par mois les nouvelles
publications parues. Disponible en-ligne et aussi par email.
ƒ Electropedia: www.electropedia.org
Le premier dictionnaire en ligne au monde de termes électroniques et électriques. Il contient plus de 20 000 termes et
définitions en anglais et en français, ainsi que les termes équivalents dans les langues additionnelles. Egalement appelé
Vocabulaire Electrotechnique International en ligne.
ƒ Service Clients: www.iec.ch/webstore/custserv/custserv_entry-f.htm
Si vous désirez nous donner des commentaires sur cette publication ou si vous avez des questions, visitez le FAQ du
Service clients ou contactez-nous:
Email: csc@iec.ch
Tél.: +41 22 919 02 11
Fax: +41 22 919 03 00
IEC 62342
Edition 1.0 2007-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Nuclear power plants – Instrumentation and control systems important to
safety – Management of ageing
Centrales nucléaires de puissance – Systèmes d’instrumentation et de
contrôle-commande importants pour la sûreté – Gestion du vieillissement

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
X
CODE PRIX
ICS 27.120.20 ISBN 2-8318-9260-0

– 2 – 62342 © IEC:2007
CONTENTS
FOREWORD.4
INTRODUCTION.6

1 Scope.8
1.1 Management of physical ageing .8
1.2 Management of technology ageing (obsolescence).8
1.3 Safety goal of this standard.8
2 Normative references .8
3 Terms and definitions .8
4 Background .11
5 Requirements for ageing management .12
5.1 General .12
5.2 Methodology.12
5.3 Process .13
6 Understanding I&C ageing phenomena.17
6.1 General .17
6.2 Stresses causing ageing .17
6.3 Ageing mechanisms and ageing effects.17
7 Requirements to address ageing effects .18
7.1 Ageing effect identification .18
7.2 Selection of I&C components for ageing evaluation .18
7.2.1 General .18
7.2.2 Identification of I&C functions, systems, and equipment .18
7.2.3 Breakdown of I&C equipment and components .18
7.2.4 Failure analysis .19
7.2.5 Susceptibility to ageing.19
7.3 Evaluating ageing degradation of I&C.20
7.4 Ageing stresses.20
7.4.1 General .20
7.4.2 External stresses influencing ageing.21
7.4.3 Internal stresses influencing ageing.21
7.4.4 Stress history and insecure conditions.21
7.5 Intended function versus qualification.22
7.5.1 Equipment specification and qualification .22
7.5.2 Impact on the qualification hypothesis .22
7.5.3 Applicability of ageing models .22
7.6 Surveillance tests and maintenance requirements .22
7.6.1 Maintenance and surveillance test processes .22
7.6.2 Ageing evidence from operating and maintenance research .22
7.6.3 Sample tests .22
7.7 Support resources .22
7.8 Documentation requirements.22
8 Requirements for ageing control.23
8.1 General .23
8.2 Definition of ageing control programs .23
8.3 Means for I&C ageing management.23

62342 © IEC:2007 – 3 –
9 Organization.24
9.1 General .24
9.2 Organization for ageing management .24
9.3 Identifying long-term operating strategies and I&C life cycle.24
9.4 Organization for the long-term maintenance of I&C equipment .25
9.5 Quality assurance .25
9.6 Reporting .25

Annex A (informative) Guidance on characterizing I&C ageing phenomena and
acquiring data for ageing management of I&C components in nuclear power plants .26
Annex B (informative) Examples of ageing management practices for selected I&C
components in nuclear power plants .29
Annex C (informative)  Examples of testing and monitoring techniques for I&C ageing
management.37

Bibliography.42

Figure B.1 – Bathtub curve model for failure rates of electronic components.29

Table 1 – Ageing management process as outlined in various clauses of this standard.13
Table B.1 – Potential effects of ageing on performance of nuclear plant pressure
transmitters.32
Table B.2 – Test methods for verifying the performance and monitoring the ageing of
I&C components .35

– 4 – 62342 © IEC:2007
INTERNATIONAL ELECTROTECHNICAL COMMISSION
______________
NUCLEAR POWER PLANTS –
INSTRUMENTATION AND CONTROL SYSTEMS
IMPORTANT TO SAFETY –
MANAGEMENT OF AGEING
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for 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 publishes 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 participate 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 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 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 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
transparentl
...