EN 62241:2015

SLOVENSKI STANDARD
01-september-2015
Jedrske elektrarne - Glavni komandni prostor - Funkcije alarma in predstavitev
(IEC 62241:2004)
Nuclear power plants - Main control room - Alarm functions and presentation (IEC
62241:2004)
Kernkraftwerke - Warte - Alarmfunktionen und ihre Darstellung (IEC 62241:2004)
Centrales nucléaires de puissance - Salle de commande principale - Fonctions et
présentation des alarmes (IEC 62241:2004)
Ta slovenski standard je istoveten z: EN 62241:2015
ICS:
27.120.20 Jedrske elektrarne. Varnost Nuclear power plants. Safety
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 62241
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2015
ICS 27.120.20
English Version
Nuclear power plants - Main control room - Alarm functions and
presentation
(IEC 62241:2004)
Centrales nucléaires de puissance - Salle de commande Kernkraftwerke - Warte - Alarmfunktionen und ihre
principale - Fonctions et présentation des alarmes Darstellung
(IEC 62241:2004) (IEC 62241:2004)
This European Standard was approved by CENELEC on 2015-02-16. 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 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 its 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 Macedonia, 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
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für 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 62241:2015 E
Foreword
This document (EN 62241:2015) consists of the text of IEC 62241:2004 prepared by
SC 45A “Instrumentation, control and electrical systems of nuclear facilities” of IEC/TC 45 “Nuclear
instrumentation".
The following dates are fixed:

• latest date by which the document has to be (dop) 2016-02-16
implemented
at national level by publication of an identical
national standard or by endorsement
(dow) 2018-02-16
• latest date by which the national standards conflicting
with the document have to be withdrawn

As stated in the nuclear safety directive 2009/71/EURATOM, Chapter 1, Article 2, item 2, Member
States are not prevented from taking more stringent safety measures in the subject-matter covered by
the Directive, in compliance with Community law. In a similar manner, this European standard does
not prevent Member States from taking more stringent nuclear safety measures in the subject-matter
covered by this standard.
Attention is drawn to the possibility that some of the elements of this document 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 62241:2004 was approved by CENELEC as a European
Standard without any modification.

- 3 - EN 62241:2015
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 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.

NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), 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

1)
IEC 60964 1989 Design for control rooms of nuclear - -
power plants
IEC 61226 -  Nuclear power plants - Instrumentation EN 61226 -
and control important to safety -
Classification of instrumentation and
control functions
IEC 61771 -  Nuclear power plants - Main control-room - - -
Verification and validation of design
IEC 61772 -  Nuclear power plants - Control rooms - EN 61772 -
Application of visual display units (VDUs)
IEC 61839 -  Nuclear power plants - Design of control EN 61839 -
rooms - Functional analysis and
assignment
1)
Superseded by IEC 60964:2009.
NORME CEI
INTERNATIONALE
IEC
INTERNATIONAL
Première édition
STANDARD
First edition
2004-11
Centrales nucléaires de puissance –
Salle de commande principale –
Fonctions et présentation des alarmes

Nuclear power plants –
Main control room –
Alarm functions and presentation

 IEC 2004 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
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PRICE CODE
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International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

62241  IEC:2004 – 3 –
CONTENTS
FOREWORD.7
INTRODUCTION.11

1 Scope and object.15
2 Normative references .15
3 Terms and definitions.17
4 Background explanations .25
4.1 Problems of alarm systems .25
4.2 Functional design elements .27
4.3 Other elements.27
5 Basic functional requirements.31
5.1 Alarm functions .31
5.2 Alarm signals .31
5.3 Alarm signal processing .33
5.4 Alarm display processing.35
5.5 Alarm control and management .35
5.6 Alarm presentation and display-control integration .37
5.7 Human factors.37
5.8 Evaluation .39
6 Design definition of alarms .39
6.1 General .39
6.2 Key alarms .41
6.3 Alarms needed .41
7 Alarm signal processing .43
7.1 General .43
7.2 Alarm signal validation .43
7.3 Alarm generation and reduction processing .43
7.4 Event sequence and time delay processing .47
7.5 First-out processing.47
8 Alarm display processing.49
8.1 General .49
8.2 Grouped alarms.49
8.3 Alarm suppression.51
8.4 Dark-board presentation.51
9 Alarm control and management .53
9.1 General .53
9.2 Audible warning and silence .53
9.3 Flash and reflash.55
9.4 Acknowledgement .55
9.5 Ringback .55
9.6 Reset .57

62241  IEC:2004 – 5 –
10 Alarm presentation and display-control integration .63
10.1 General .63
10.2 Alarm fascia and tile.69
10.3 VDU alarm list display .71
10.4 Audible annunciation .77
11 Reliability, testing, and maintainability.77
11.1 Reliability .77
11.2 Testing .77
11.3 Maintainability .79
12 Alarm recording .79
13 Alarm response procedures (ARP) .81
13.1 General .81
13.2 Contents .81
13.3 Format .81

Annex A (informative) Problems of alarm system .83
Annex B (informative) Information sources for signals used to generate alarms .85
Annex C (informative) Examples of alarm processing logic and dynamic prioritisation.87
Annex D (informative) Conceptual example of alarm grouping and categorisation.91
Annex E (informative) Material for the need of distinction between alarm and status
information.95
Annex F (informative) Example of arrangement of alarm tiles.97
Annex G (informative) Examples of Points to Consider in the Categorisation of Alarms.99

Figure 1 – Alarm system functional design elements.
...