SIST IEC/TR 61000-5-2:1998

IEC 61504
®

Edition 2.0 2017-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Nuclear facilities – Instrumentation and control systems important to safety –
Centralized systems for continuous monitoring of radiation and/or levels of
radioactivity

Installations nucléaires – Systèmes d’instrumentation et de contrôle-commande
importants pour la sûreté – Systèmes centralisés pour la surveillance en continu
des rayonnements et/ou des niveaux de radioactivité

IEC 61504:2017-05(en-fr)

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IEC 61504

®


Edition 2.0 2017-05




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











Nuclear facilities – Instrumentation and control systems important to safety –

Centralized systems for continuous monitoring of radiation and/or levels of

radioactivity




Installations nucléaires – Systèmes d’instrumentation et de contrôle-commande

importants pour la sûreté – Systèmes centralisés pour la surveillance en continu


des rayonnements et/ou des niveaux de radioactivité













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 27.120.20 ISBN 978-2-8322-4222-3



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – IEC 61504:2017  IEC 2017
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 11
4 Design requirements . 12
4.1 General . 12
4.1.1 Background . 12
4.1.2 General characteristics and lifecycle (IEC 61559-1:2009, 4.1.1) . 13
4.1.3 Safety classification and applicable standards (IEC 61559-1:2009, 4.1.2) . 13
4.1.4 System architecture and configuration (IEC 61559-1:2009, 4.1.3) . 13
4.1.5 Location of detector assemblies (IEC 61559-1:2009, 4.1.4) . 15
4.1.6 Failure mode . 16
4.1.7 Interlock functions . 16
4.1.8 Control functions . 16
4.1.9 Control of access . 16
4.1.10 Testability . 16
4.1.11 Maintainability . 17
4.1.12 Operator interface . 17
4.1.13 Data communication . 17
4.2 Design requirements for the subassemblies . 17
4.2.1 Detector assembly (IEC 61559-1:2009, 4.2.1) . 17
4.2.2 Processing assembly (IEC 61559-1:2009, 4.2.2) . 17
4.2.3 Alarm assembly (IEC 61559-1:2009, 4.2.3) . 18
4.2.4 Subsystem computer . 18
4.2.5 Operator console . 18
4.2.6 Interconnections . 18
4.3 Central computer . 18
4.3.1 General (IEC 61559-1:2009, 4.3.1) . 18
4.3.2 Functional requirements of the central computer (IEC 61559-1:2009,
4.3.2) . 18
4.3.3 Checking normal operation of the equipment (IEC 61559-1 4.3.3) . 19
4.3.4 Modifications . 20
4.3.5 Recommended features . 20
4.4 Electrical characteristics . 21
4.4.1 General (IEC 61559-1:2009, 4.4.1) . 21
4.4.2 Electromagnetic compatibility (IEC 61559-1:2009, 4.4.2) . 21
4.5 Radiation monitoring functions . 21
5 General test procedures . 21
5.1 General . 21
5.2 Test requirements (IEC 61559-1:2009, 5.1). 21
5.3 Test procedures for subassemblies . 21
5.3.1 Test procedures for the detector assembly (IEC 61559-1:2009, 5.2) . 21
5.3.2 Test procedures for the combination of processing, detector and alarm
assemblies (IEC 61559-1:2009, 5.3) . 21
5.3.3 Test procedures for subsystem computer. 22
5.3.4 Test procedures for operator consoles . 22

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IEC 61504:2017  IEC 2017 – 3 –
5.4 Test procedures for the central computer (IEC 61559-1:2009, 5.4). 22
5.5 Test procedures for effects of power supply and environmental variations
(IEC 61559-1:2009, 5.5) . 22
5.6 Test procedures for data communications . 22
5.7 System validation . 22
5.8 System installation and commissioning testing . 23
5.9 System qualification . 23
6 Documentation . 23
6.1 General . 23
6.2 Report on type testing (IEC 61559-1:2009, 6.1) . 23
6.3 Certification (IEC 61559-1:2009, 6.2) . 23
6.4 Operating and maintenance manual (IEC 61559-1:2009, 6.3) . 24
6.5 Additional documentation . 24
Annex A (informative) Cross-references for centralized system for radiation
monitoring standards . 25
Bibliography . 28

Figure 1 – Example of a typical centralized system configuration . 15

Table 1 – Overview of the standards covering the domain of radiation monitoring in
nuclear facilities . 7
Table 2 – Reference conditions and standard test conditions (unless otherwise
indicated by the supplier) . 24
Table A.1 – Cross-reference table for centralized system for radiation monitoring
standards . 25

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– 4 – IEC 61504:2017  IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

NUCLEAR FACILITIES – INSTRUMENTATION AND CONTROL SYSTEMS
IMPORTANT TO SAFETY – CENTRALIZED SYSTEMS FOR CONTINUOUS
MONITORING OF RADIATION AND/OR LEVELS OF RADIOACTIVITY

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
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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
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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
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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 61504 has been prepared by subcommittee 45A: Instrumentation,
control and electrical systems of nuclear facilities, of IEC technical committee 45: Nuclear
instrumentation.
This second edition cancels and replaces the first edition of IEC 61504, published in 2000,
and the first edition of IEC 61559-2, published by subcommittee 45B in 2002, and constitutes
a technical revision.
This standard is to be read in conjunction with IEC 61559-1.
This edition includes the following significant technical changes with respect to the previous
edition:
a) It supplements IEC 61559-1 and integrates IEC 61559-2.

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IEC 61504:2017  IEC 2017 – 5 –
b) It describes integration of functions including equipment such as those covered by
IEC 60761-1, IEC 60761-2, IEC 60761-3, IEC 60761-4, IEC 60761-5, IEC 60768,
IEC 60861, IEC 60910, IEC 60951-1 IEC 60951-2, IEC 60951-3, IEC 60951-4,
IEC 60951-5, IEC 61031, IEC 61250, IEC 62302 and IEC 62303.
c) It establishes requirements for integration in centralized systems as defined by IEC 62705.
The text of this standard is based on the following documents:
FDIS Report on voting
45A/1135/FDIS 45A/1149/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.

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– 6 – IEC 61504:2017  IEC 2017
INTRODUCTION
a) Technical background, main issues and organisation of the standard
Advances in distributed system technology have led to the introduction of centralized
programmable digital systems for radiation monitoring into nuclear facilities.
IEC 61559 was introduced in 1996 to address centralized systems for radiation monitoring
in non-reactor nuclear facilities. That standard primarily focused upon category C
functions, such as area monitoring and excluded nuclear power plant applications. As
IEC 61559 was being released, subcommittee 45A determined that it would be useful to
develop a similar standard to address nuclear power plant application of plant-wide
radiation monitoring systems, at that time. The intent was that IEC 61504 would parallel
IEC 61559 would integrate or directly reference the other nuclear power standards that are
relevant to plant-wide radiation monitoring. IEC 61504 was published on 2000-05.
As IEC 61559 was in the final release process, subcommittee 45B recognized the need to
broaden the scope of that standard to include other applications of centralized radiation
monitoring in nuclear facilities. These broader applications included, for example,
monitoring of plant discharges, interlock of control functions, and environmental
monitoring. IEC 61559-2 was developed to cover these broader functions, including
category B functions, in non-reactor nuclear facilities and was published on 2002-06.
In 2004, the scope of subcommittee 45A standards was extended from “Reactor
instrumentation” to “Instrumentation and control system of nuclear facilities”.
This Standard reflects this increased scope of application and merges the extant
requirements of IEC 61504 with those in IEC 61559-2. Hence this Standard comes to
cover not only nuclear power plants but also nuclear facilities other than nuclear power
plants.
b) Situation of the current Standard in the structure of the IEC SC 45A standard series
IEC 61504 is the third level in the hierarchy of SC 45A standards. This standard provides
centralized systems for radiation monitoring for nuclear facilities. This standard is
applicable to the centralized systems for radiation monitoring to be used for functions
important to safety in nuclear facilities.
IEC 62705 provides the guidance for the radiation monitoring system (RMS) on the
application of existing IEC/ISO standards covering design and qualification of system and
equipment for RMS. IEC 62705 is the supplements of IEC 61513 and it is not intended that
IEC 62705 limits the application of other IEC 61513 requirements to RMS lifecycle.
IEC 61513 is the first level standard of SC 45A standards, and provides general
requirements for I&C systems and equipment that are used to perform functions important
to safety in NPPs. IEC 61226 provides the criteria for classification of instrumentation and
control functions. Most modern RMSs contain programmable digital equipment. Hence
RMS should often be treated as programmable digital system. So the following standards
required for programmable digital system are generally applicable to RMS. IEC 60880
provides the software requirements for category A functions and IEC 62138 provides the
software requirements for Category B or C functions. IEC 60987 provides hardware design
requirements for programmable digital systems. IEC 62566 provides the requirements for
HDL-Programmed Device (HPD) for systems performing category A functions. For the
qualification testing, the following SC 45A standards are applicable. IEC/IEEE 60780-323
provides the guide for the environmental qualification and IEC 60980 provides the
guidance for seismic qualification for equipment performing category A or B
functions.IEC 62003 provides the requirements for electromagnetic compatibility testing. In
addition, IEC 61250 specifies the leak detection requirements by using RMS.
For radiation monitoring specific requirements, the following standards provide
requirements and guidance for RMS. The IEC 60951 series provides guidance on the
design and testing of radiation monitoring equipment used for accident and post-accident
conditions. The IEC 60761 series provide requirements for equipment for continuous off-
line monitoring of radioactivity in gaseous effluent in normal conditions. Some of the
SC 45B standards (e.g. Gas offline: IEC 62302, Tritium: IEC 62303) are now replacing the
IEC 60761 series. IEC 60861 provides requirements for equipment continuous off-line
monitoring of radioactivity in liquid effluent in normal conditions. IEC 60768 provides

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IEC 61504:2017  IEC 2017 – 7 –
requirements for equipment for continuous in-line and on-line monitoring of radioactivity in
process stream in normal and incident conditions. IEC 61031 provides requirements for
equipment for area radiation monitor in normal conditions in conjunction with IEC 60532.
IEC 61504 provides requirements for centralized system for plant-wide radiation
monitoring in conjunction with the IEC 61559 series which specifies the requirements for
centralized system. If the centralized system is a part of the safety parameter display
system, IEC 60960 provides the functional design criteria. ISO 2889 gives guidance on
gas and particulate sampling. The ISO 4037 series provides calibration methodology for
radiation monitors.
The relationship among these various standards is given in Table 1.
Table 1 – Overview of the standards covering
the domain of radiation monitoring in nuclear facilities
IEC
Developer ISO
SC 45A SC 45B
Accident and
Scope Sampling Calibration post accident Normal conditions
conditions
IEC 62302 /
Radioactive noble gas
ISO 4037-1, IEC 60951-1,
ISO 2889 N/A IEC 60761-1,
off-line monitoring ISO 4037-3 IEC 60951-2
IEC 60761-3
Radioactive aerosol off- ISO 4037-1, IEC 60951-1, IEC 60761-1,
ISO 2889 N/A
line monitoring ISO 4037-3 IEC 60951-2 IEC 60761-2
Radioactive iodine off- ISO 4037-1, IEC 60951-1, IEC 60761-1,
ISO 2889 N/A
line monitoring ISO 4037-3 IEC 60951-2 IEC 60761-4
Liquid off-line monitoring N/A N/A N/A N/A IEC 60861
IEC 62303 /
Tritium off-line
N/A N/A N/A N/A IEC 60761-1,
monitoring
IEC 60761-5
On-line or in-line
ISO 4037-1, IEC 60951-1,
N/A IEC 60768 N/A
monitoring ISO 4037-3 IEC 60951-4
ISO 4037-1, IEC 60951-1,
Area monitoring N/A IEC 61031 IEC 60532
ISO 4037-3 IEC 60951-3
Centralized system N/A N/A IEC 61504, IEC 60960 IEC 61559-1
IEC 61513, IEC 60880,
IEC 60987, IEC 61226,
Classification/basic
N/A N/A IEC 62138, IEC 62566, N/A
requirements
IEC 62645, IEC 61250,
IEC 61500, IEC 61504
IEC 60980, IEC 62003,
Qualification N/A N/A IEC 62706
IEC/IEEE 60780-323

For more details on the structure of the IEC SC 45A standard series, see item d) of this
introduction.
c) Recommendations and limitations regarding the application of this Standard
Where requirements are given in this standard, they refer generally to the need to apply
other IEC and ISO Standards and specific functional and technical requirements contained
in these Standards.
To ensure that the standard will continue to be relevant in future years, the emphasis has
been placed on issues of principle, rather than specific technologies.
d) Description of the structure of the IEC SC 45A standard series and relationships
with other IEC documents and other bodies documents (IAEA, ISO)
The top-level documents of the IEC SC 45A standard series are IEC 61513 and IEC 63046.
IEC 61513 provides general requirements for I&C systems and equipment that are used to
perform functions important to safety in NPPs. IEC 63046 provides general requirements
for electrical power systems of NPP; it covers power supply systems including the supply

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– 8 – IEC 61504:2017  IEC 2017
systems of the I&C systems. IEC 61513 and IEC 63046 are to be considered in
conjunction and at the same level. IEC 61513 and IEC 63046 structure the IEC SC 45A
standard series and shape a complete framework establishing general requirements for
instrumentation, control and electrical systems for nuclear power plants.
IEC 61513 and IEC 63046 refer directly to other IEC SC 45A standards for general topics
related to categorization of functions and classification of systems, qualification,
separation, defence against common cause failure, control room design, electromagnetic
compatibility, cybersecurity, software and hardware aspects for programmable digital
systems, coordination of safety and security requirements and management of ageing.
The standards referenced directly at this second level should be considered together with
IEC 61513 and IEC 63046 as a consistent document set.
At a third level, IEC SC 45A standards not directly referenced by IEC 61513 or by
IEC 63046 are standards related to specific equipment, technical methods, or specific
activities. Usually these documents, which make reference to second-level documents for
general topics, can be used on their own.
A fourth level extending the IEC SC 45A standard series, corresponds to the Technical
Reports which are not normative.
The IEC SC 45A standards series consistently implements and details the safety and
security principles and basic aspects provided in the relevant IAEA safety standards and
...