IEC 61031:2020
(Main)Nuclear facilities - Instrumentation and control systems - Design, location and application criteria for installed area gamma radiation dose rate monitoring equipment for use during normal operation and anticipated operational occurrences
Nuclear facilities - Instrumentation and control systems - Design, location and application criteria for installed area gamma radiation dose rate monitoring equipment for use during normal operation and anticipated operational occurrences
IEC 61031:2020 applies to the design, location and application of installed equipment for monitoring local gamma radiation dose rates within nuclear facilities during normal operation and anticipated operational occurrences. High range area gamma radiation dose rate monitoring equipment for accident conditions currently addressed by IEC 60951-1 and IEC 60951-3 is not within the scope of this document. This document does not apply to the measurement of neutron dose rate. Additional equipment for neutron monitoring may be required, depending on the plant design, if the neutron dose rate makes a substantial contribution to the total dose equivalent to personnel.
This document provides guidelines for the design principles, the location, the application, the calibration, the operation, and the testing of installed equipment for continuously monitoring local gamma radiation dose rates in nuclear facilities under normal operation conditions and anticipated operational occurrences. These instruments are normally referred to as area radiation monitors. Portable instruments are also used for this purpose but are not covered by this document.
Installations nucléaires - Systèmes d'instrumentation et de contrôle-commande - Critères de conception, d'implantation et d'application pour les matériels de surveillance du débit de dose de rayonnement gamma à poste fixe, utilisés pendant le fonctionnement normal et lors d'incidents de fonctionnement prévus
IEC 61031:2020 s'applique à la conception, l'implantation et l'application des matériels à poste fixe destinés à la surveillance locale des débits de dose de rayonnement gamma dans les installations nucléaires pour le fonctionnement normal et les incidents de fonctionnement prévus. Le matériel de surveillance du débit de dose de rayonnement gamma à large gamme pour les conditions accidentelles est actuellement couvert par l'IEC 60951-1 et l'IEC 60951-3; il n'entre pas dans le domaine d'application du présent document. Le présent document fournit des lignes directrices pour les principes de conception, l'implantation, l'application, l'étalonnage, le fonctionnement et les essais du matériel à poste fixe destiné à la surveillance permanente des débits de dose de rayonnement gamma local dans les installations nucléaires, dans des conditions de fonctionnement normal et d'incidents de fonctionnement prévus. Ces appareils sont généralement appelés moniteurs de rayonnement de zone. Des appareils portatifs sont également utilisés dans ce but, mais ne sont pas couverts par le présent document.
Le présent document est destiné à être utilisé conjointement avec l'IEC 60532:2010. Cette deuxième édition annule et remplace la première édition parue en 1990. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a. extension du domaine d'application de la norme des centrales nucléaires de puissance aux installations nucléaires et alignement du titre en conséquence;
b.prise en compte des normes pertinentes publiées par le SC 45A de l'IEC depuis la publication de la première édition et référence à ces normes, le cas échéant.
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IEC 61031 ®
Edition 2.0 2020-07
INTERNATIONAL
STANDARD
Nuclear facilities – Instrumentation and control systems – Design, location and
application criteria for installed area gamma radiation dose rate monitoring
equipment for use during normal operation and anticipated operational
occurrences
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
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International Standards for all electrical, electronic and related technologies.
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IEC 61031 ®
Edition 2.0 2020-07
INTERNATIONAL
STANDARD
Nuclear facilities – Instrumentation and control systems – Design, location and
application criteria for installed area gamma radiation dose rate monitoring
equipment for use during normal operation and anticipated operational
occurrences
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.280; 27.120.10 ISBN 978-2-8322-8586-2
– 2 – IEC 61031:2020 © IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 10
4 Abbreviated terms . 11
5 Design principles . 11
5.1 Function and application criteria . 11
5.2 General requirements . 12
5.2.1 General characteristics and lifecycle . 12
5.2.2 Safety classification and applicable standards . 12
5.3 Range of measurements . 13
5.4 Location criteria . 13
5.4.1 General . 13
5.4.2 Detector assembly . 14
5.4.3 Processing assembly . 14
5.4.4 Alarm assembly . 14
5.5 Energy response . 14
5.6 Signal processing and display . 15
5.7 Power supply . 15
6 Functional test . 15
7 Qualification . 15
7.1 General . 15
7.2 Environmental qualification . 15
7.3 Seismic qualification . 16
7.4 Electromagnetic interference. 16
8 Calibration . 16
8.1 General . 16
8.2 Calibration and functional check . 16
8.2.1 General . 16
8.2.2 Initial calibration . 16
8.2.3 Calibration check after installation . 16
8.2.4 Functional check. 16
8.2.5 Countermeasures to loss of monitoring during calibration or functional
check . 17
8.3 Radiation calibration . 17
Annex A (informative) Examples of locations and measuring ranges of area radiation
monitors. 18
Annex B (informative) "Foldback" of detector . 20
Bibliography . 21
Figure B.1 – Foldback illustration . 20
Figure B.2 – GM recovery times . 20
Table 1 – Overview of the standards covering the domain of radiation monitoring in
nuclear facilities . 7
Table A.1 – Light water cooled reactor plants . 18
Table A.2 – Gas cooled reactor plants . 18
Table A.3 – Sodium cooled fast reactor plants . 19
– 4 – IEC 61031:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NUCLEAR FACILITIES –
INSTRUMENTATION AND CONTROL SYSTEMS –
DESIGN, LOCATION AND APPLICATION CRITERIA FOR
INSTALLED AREA GAMMA RADIATION DOSE RATE MONITORING
EQUIPMENT FOR USE DURING NORMAL OPERATION AND ANTICIPATED
OPERATIONAL OCCURRENCES
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
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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.
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International Standard IEC 61031 has been prepared by subcommittee 45A: Instrumentation,
control and electrical power systems of nuclear facilities, of IEC technical committee 45: Nuclear
instrumentation.
This document is to be used in conjunction with IEC 60532:2010.
This second edition cancels and replaces the first edition published in 1990. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) The scope of the standard is extended from nuclear power plants to nuclear facilities and
the title is accordingly aligned.
b) The relevant standards published by IEC SC 45A since the publication of the first edition
are taken into account and refered to when relevant.
The text of this International Standard is based on the following documents:
FDIS Report on voting
45A/1328/FDIS 45A/1341/RVD
Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 6 – IEC 61031:2020 © IEC 2020
INTRODUCTION
a) Technical background, main issues and organisation of the standard
This IEC standard specifically focuses on radiation monitoring systems used for normal
operation and anticipated opera
...
IEC 61031 ®
Edition 2.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Nuclear facilities – Instrumentation and control systems – Design, location and
application criteria for installed area gamma radiation dose rate monitoring
equipment for use during normal operation and anticipated operational
occurrences
Installations nucléaires – Systèmes d'instrumentation et de contrôle-commande –
Critères de conception, d'implantation et d'application pour les matériels de
surveillance du débit de dose de rayonnement gamma à poste fixe, utilisés
pendant le fonctionnement normal et lors d'incidents de fonctionnement prévus
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
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About the IEC
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International Standards for all electrical, electronic and related technologies.
About IEC publications
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IEC 61031 ®
Edition 2.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Nuclear facilities – Instrumentation and control systems – Design, location and
application criteria for installed area gamma radiation dose rate monitoring
equipment for use during normal operation and anticipated operational
occurrences
Installations nucléaires – Systèmes d'instrumentation et de contrôle-commande –
Critères de conception, d'implantation et d'application pour les matériels de
surveillance du débit de dose de rayonnement gamma à poste fixe, utilisés
pendant le fonctionnement normal et lors d'incidents de fonctionnement prévus
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.280; 27.120.10 ISBN 978-2-8322-2197-6
– 2 – IEC 61031:2020 © IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 10
4 Abbreviated terms . 11
5 Design principles . 11
5.1 Function and application criteria . 11
5.2 General requirements . 12
5.2.1 General characteristics and lifecycle . 12
5.2.2 Safety classification and applicable standards . 12
5.3 Range of measurements . 13
5.4 Location criteria . 13
5.4.1 General . 13
5.4.2 Detector assembly . 14
5.4.3 Processing assembly . 14
5.4.4 Alarm assembly . 14
5.5 Energy response . 14
5.6 Signal processing and display . 15
5.7 Power supply . 15
6 Functional test . 15
7 Qualification . 15
7.1 General . 15
7.2 Environmental qualification . 15
7.3 Seismic qualification . 16
7.4 Electromagnetic interference. 16
8 Calibration . 16
8.1 General . 16
8.2 Calibration and functional check . 16
8.2.1 General . 16
8.2.2 Initial calibration . 16
8.2.3 Calibration check after installation . 16
8.2.4 Functional check. 16
8.2.5 Countermeasures to loss of monitoring during calibration or functional
check . 17
8.3 Radiation calibration . 17
Annex A (informative) Examples of locations and measuring ranges of area radiation
monitors. 18
Annex B (informative) "Foldback" of detector . 20
Bibliography . 21
Figure B.1 – Foldback illustration . 20
Figure B.2 – GM recovery times . 20
Table 1 – Overview of the standards covering the domain of radiation monitoring in
nuclear facilities . 7
Table A.1 – Light water cooled reactor plants . 18
Table A.2 – Gas cooled reactor plants . 18
Table A.3 – Sodium cooled fast reactor plants . 19
– 4 – IEC 61031:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NUCLEAR FACILITIES –
INSTRUMENTATION AND CONTROL SYSTEMS –
DESIGN, LOCATION AND APPLICATION CRITERIA FOR
INSTALLED AREA GAMMA RADIATION DOSE RATE MONITORING
EQUIPMENT FOR USE DURING NORMAL OPERATION AND ANTICIPATED
OPERATIONAL OCCURRENCES
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 natio
...
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