IEC 62385:2007

Nuclear power plants - Instrumentation and control important to safety - Methods for assessing the performance of safety system instrument channels

Defines the requirements for demonstrating acceptable performance of safety system instrument channels through response time testing, calibration verification, and other means. The same requirements may be adopted for demonstrating the acceptable performance of non-safety systems and other instrument channels.

Centrales nucléaires de puissance - Instrumentation et contrôle-commande importants pour la sûreté - Méthodes d'évaluation des performances des chaînes d'instrumentation des systèmes de sûreté

Définit des exigences permettant d'assurer que les performances des chaînes d'instrumentation des systèmes de sûreté sont acceptables, sur la base d'essais relatifs aux temps de réponse, par la vérification de l'étalonnage ou d'autres moyens. Les mêmes exigences peuvent être retenues pour démontrer que les performances de systèmes non classés de sûreté ou d'autres chaînes d'instrumentation sont acceptables.

General Information

• Status: Published
• Publication Date: 20-Jun-2007
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 27.120.20 - Nuclear power plants. Safety
• Technical Committee: SC 45A - Instrumentation, control and electrical power systems of nuclear facilities
• Drafting Committee: WG 9 - TC 45/SC 45A/WG 9
• Current Stage: PPUB - Publication issued
• Start Date: 15-Aug-2007
• Completion Date: 21-Jun-2007

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD
CEI
NORME
First edition
INTERNATIONALE
Première édition
2007-06
Nuclear power plants –
Instrumentation and control important to safety –
Methods for assessing the performance of
safety system instrument channels

Centrales nucléaires de puissance –
Instrumentation et contrôle-commande
importants pour la sûreté –
Méthodes d’évaluation des performances
des chaînes d’instrumentation
des systèmes de sûreté
Reference number
Numéro de référence
IEC/CEI 62385:2007
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: [e-mail]
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 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: [e-mail]
Tel.: [phone]
Fax: [phone]
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 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: [e-mail]
Tél.: [phone]
Fax: [phone]
INTERNATIONAL IEC
STANDARD
CEI
NORME
First edition
INTERNATIONALE
Première édition
2007-06
Nuclear power plants –
Instrumentation and control important to safety –
Methods for assessing the performance of
safety system instrument channels

Centrales nucléaires de puissance –
Instrumentation et contrôle-commande
importants pour la sûreté –
Méthodes d’évaluation des performances
des chaînes d’instrumentation
des systèmes de sûreté
PRICE CODE
W
CODE PRIX
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
Pour prix, voir catalogue en vigueur

– 2 – 62385 © IEC:2007
CONTENTS
FOREWORD.4
INTRODUCTION.6

1 Scope.8
2 Normative references .8
3 Terms and definitions .8
4 Requirements for performance verification of process instruments .11
4.1 Background .11
4.2 General requirements.11
4.3 Testing environment.11
4.4 Test interval .12
4.5 Test location .12
4.6 Calibration of measurement and test equipment .12
4.7 Test results .12
4.8 Validation of test methods .12
4.9 Qualifications of test personnel .13
5 Acceptable means for instrument performance verification .13
5.1 Introduction .13
5.2 Calibration.13
5.3 Channel checks.14
5.4 Functional test.14
5.5 Response time testing .14
6 Methods to verify instrument calibration.14
6.1 General considerations.14
6.2 Cross-calibration (cross-validation) method .15
6.3 On-line calibration monitoring.16
6.3.1 Introduction .16
6.3.2 Principle of on-line calibration monitoring .16
6.3.3 Data acquisition requirements .16
6.3.4 Data qualification and data analysis requirements .17
6.3.5 Accounting for common mode drift.17
6.3.6 Data collection frequency .17
7 Methods for response time testing .17
7.1 Response time testing of pressure transmitters .17
7.1.1 Ramp test.18
7.1.2 Noise analysis technique .18
7.1.3 Power interrupt (PI) test .19
7.2 Response time testing of temperature sensors .19
7.2.1 Plunge test .19
7.2.2 LCSR test.20
7.2.3 Self-heating test .21
7.2.4 Noise analysis .21
8 On-line detection of blockages and voids in pressure sensing lines .21
9 Verifying the performance of neutron detectors .22

62385 © IEC:2007 – 3 –
Annex A (informative) RTD cross-calibration/cross-validation .23
Annex B (informative) On-line calibration monitoring.28
Annex C (informative) Response time testing techniques for pressure transmitters and
neutron detectors.30
Annex D (informative) Response time testing techniques for RTDs .33

Bibliography.37

– 4 – 62385 © IEC:2007
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NUCLEAR POWER PLANTS –
INSTRUMENTATION AND CONTROL IMPORTANT TO SAFETY –
METHODS FOR ASSESSING THE PERFORMANCE
OF SAFETY SYSTEM INSTRUMENT CHANNELS

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
transparently to the maximum extent possible 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
equipment 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 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) Attention 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. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62385 has been prepared by subcommittee 45A: Instrumentation
and control of nuclear facilities, of IEC technical committee 45: Nuclear instrumentation.
The text of this standard is based on the following documents:
FDIS Report on voting
45A/653/FDIS 45A/661/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 Dire
...