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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
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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
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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
...