IEC 61504:2017

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

IEC 61504:2017 supplements IEC 61559-1 and includes radiation monitoring functions important to safety that are outside the scope of IEC 61559-1. It applies to centralized systems having a direct role in the achievement or maintenance of radiation protection in nuclear facilities. These systems perform functions such as:
- radiation protection of plant discharge; interlock of control functions to prevent or to mitigate accidental release of radioactive material;
- radiation and environmental monitoring functions to support monitoring of and response to accidents;
- provide information to process control or safety systems for use in control or interlock functions. This new edition includes the following significant technical changes with respect to the previous edition:
- it supplements IEC 61559-1 and integrates IEC 61559-2;
- it describes integration of functions including equipment covered by other IEC standards.

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

L'IEC 61504:2017 complète l’IEC 61559-1 pour couvrir les fonctions de surveillance des rayonnements importantes pour la sûreté qui ne font pas partie du domaine de l'IEC 61559-1. Elle est applicable aux systèmes centralisés qui ont un rôle direct pour garantir la protection contre les rayonnements et la maintenir sur les installations nucléaires. Les systèmes couverts réalisent des fonctions telles que:
- protection au niveau des rejets radioactifs de l’installation;
- verrouillage de fonctions de commande pour prévenir ou compenser les rejets radioactifs accidentels;
- surveillance des rayonnements et environnementale en soutien à la surveillance et à la réponse post accidentelle;
- fourniture d’information pour les systèmes de sûreté ou de conduite du procédé au niveau de fonctions de commande ou de verrouillage. Les principales modifications techniques par rapport à l'édition précédente sont les suivantes:
- elle complète l’IEC 61559-1 et intègre l’IEC 61559-2;
- elle décrit l’intégration des fonctions basées sur les matériels couverts par d'autres normes de l'IEC.

Electromagnetic compatibility (EMC) - Part 5: Installation and mitigation guidelines - Section 2: Earthing and cabling

General Information

• Status: Published
• Publication Date: 10-May-2017
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 27.120.20 - Nuclear power plants. Safety
• ICS: 33.100 - Electromagnetic compatibility (EMC)
• Technical Committee: SC 45A - Instrumentation, control and electrical power systems of nuclear facilities
• Drafting Committee: WG 5 - TC 45/SC 45A/WG 5
• Current Stage: PPUB - Publication issued
• Start Date: 05-May-2017
• Completion Date: 11-May-2017
• Ref Project: SIST IEC/TR 61000-5-2:1998 - Electromagnetic compatibility (EMC) - Part 5: Installation and mitigation guidelines - Section 2: Earthing and cabling

Relations

• Replaces: IEC 61559-2:2002 - Radiation in nuclear facilities - Centralized systems for continuous monitoring of radiation and/or levels of radioactivity - Part 2: Requirements for discharge, environmental, accident, or post-accident monitoring functions
• Effective Date: 05-Sep-2023
• Revises: IEC 61504:2000 - Nuclear power plants - Instrumentation and control systems important to safety - Plant-wide radiation monitoring
• Effective Date: 05-Sep-2023

Standards Content (Sample)

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

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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

– 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

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 syste
...

SLOVENSKI STANDARD
01-september-1998
Electromagnetic compatibility (EMC) - Part 5: Installation and mitigation guidelines
- Section 2: Earthing and cabling
Electromagnetic compatibility (EMC) - Part 5: Installation and mitigation guidelines -
Section 2: Earthing and cabling
Compatibilité électromagnétique (CEM) - Partie 5: Guides d'installation et d'atténuation -
Section 2: Mise à la terre et câblage
Ta slovenski standard je istoveten z: IEC/TR 61000-5-2
ICS:
33.100.99 Drugi vidiki v zvezi z EMC Other aspects related to
EMC
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

RAPPORT
CEI
TECHNIQUE – TYPE 3
IEC
61000-5-2
TECHNICAL
Première édition
REPORT – TYPE 3
First edition
1997-11
Compatibilité électromagnétique (CEM) –
Partie 5: Guides d’installation et d’atténuation –
Section 2: Mise à la terre et câblage
Electromagnetic compatibility (EMC) –
Part 5: Installation and mitigation guidelines –
Section 2: Earthing and cabling
 IEC 1997 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
utilisée sous quelque forme que ce soit et par aucun any form or by any means, electronic or mechanical,
procédé, électronique ou mécanique, y compris la photo- including photocopying and microfilm, without permission in
copie et les microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.
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Telefax: [phone] e-mail: [e-mail] IEC web site http: //www.iec.ch
CODE PRIX
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Pour prix, voir catalogue en vigueur
For price, see current catalogue

61000-5-2 © IEC:1997 – 3 –
CONTENTS
Page
FOREWORD . 9
INTRODUCTION . 13
Clause
1 Scope . 17
2 Reference documents . 17
3 Definitions. 17
4 General EMC considerations on installation of earthing and cabling systems . 23
4.1 General . 23
4.2 EMC and safety (insulation) installation requirements. 25
4.3 Equipment and installation ports . 25
5 Earthing and bonding . 25
5.1 Requirements concerning safety. 25
5.2 Requirements concerning EMC. 27
5.3 Design of the earthing system. 29
6 Bonding . 41
6.1 General . 41
6.2 Bonding straps . 43
6.3 Connections . 45
6.4 Bonding of specific equipment . 47
6.5 Procedures for users . 49
7 Cables and wires . 51
7.1 General . 51
7.2 Differential and common mode circuit, transfer impedance Z . 53
t
7.3 Set of EMC rules for cable and wire installation. 57
7.4 Types of cables and their use with regard to EMC. 61
7.5 Types of parallel-earthing conductor (PEC) . 63
7.6 Connecting and earthing of cables and parallel earthed conductors. 69
7.7 General routing of cables. 71
7.8 Cable bundles . 77
7.9 Cables serving power ports. 79
7.10 Cables serving signal and control ports. 81
8 Additional interference mitigation methods . 87
8.1 Common-mode ferrite choke. 87
8.2 Electrical separation . 89
9 Measuring and testing methods. 93
9.1 Earthing and bonding. 93
9.2 Cables and installation. 95

61000-5-2 © IEC:1997 – 5 –
Page
Figures
1 Demonstration of the fallacy of the “equipotentiality” concept as a universal rule . 27
2 Schematic plan view of a typical earth electrode . 31
3 Misconception of “dedicated”, “independent”, or “isolated” earth electrodes . 31
4 The concept of a single earth electrode . 33
5 Recommended configuration for the earth electrodes and earthing network . 33
6 Loops involving signal cables and earthing network . 35
7 A three-dimensional schematic of the recommended approach
for the earthing network . 37
8 General principles for bonding of various apparatus or systems
to the earthing network. 39
9 Simplified representation of a bonding strap . 41
10 A more realistic representation of an installed bonding strap. 43
11 Typical bonding straps . 45
12 Relative inductance of flat and round conductors . 45
13 Relative inductance of round, flat and double bonding straps . 45
14 Example of protected removable connection of a bonding strap . 47
15 Example of optimal bonding of a shielded cable to the enclosure . 49
16 Schematic of interconnected chassis. 49
17 Differential mode and common mode circuits with bonding strips and signal cables . 53
18 Effect of the configuration of a parallel-earthing conductor
on the transfer impedance. 63
19 Slits in conduits and cable trays . 65
20 Recommended configuration for cable trays with branches . 67
21 Recommended cable positions parallel to an H-shaped beam
from the EMC point of view . 67
22 Penetration of a shielded cable through an enclosure wall . 69
23 Tray with partition. 75
24 Example of stacking for conduits or trays . 75
25 Topology of circuits containing switches . 81
26 Undesirable connection of a coaxial cable . 85
27 Typical implementations of common-mode ferrite chokes . 87
28 Limitations in the effectiveness of an isolation transformer . 91
29 Parasitic coupling at high frequencies. 93

61000-5-2 © IEC:1997 – 7 –
Page
Annexes
A – Examples of earthing systems and cable implementation . 97
B – Applying cable theory to enhance EMC . 109
C – Benefits of additional conductors parallel to a cable. 125
D – Bibliography . 1 35
Annex figures
A.1 – Example of topology for a hybrid earthing system. 99
A.2 – EMC cabinet for the protection of sensitive electronics. 101
A.3 – Earthing system for a drive with converter and associated electronics . 103
A.4 – Earthing configuration for a power supply system with associated electronics . 103
A.5 – Initial arrangement of the power and control cables. 105
A.6 – Improved design with appropriate shield connections . 107
B.1 – Unbalanced transport of signals. 109
B.2 – Behaviour of Z' as function of frequency for several coaxial cable configurations . 111
t
B.3 – Unbalanced transmission system connected to earth at one end . 113
B.4 – Balanced transmission system . 113
B.5 – Current paths in a coaxial cable . 115
B.6 – Differential-mode voltage induced by a magnetic field in a cable
with braided shield . 117
B.7 – Currents in the outer conductor of a coaxial cable . 119
B.8 – A two-lead cable perturbed by a nearby lead at the voltage U . 123
ext
C.1 – Coaxial cables with parallel-earthing conductors . 125
C.2 – A coaxial cable with two outer conductors . 127
C.3 – Transfer impedances in a shielded balanced pair . 129
C.4 – Example of transfer impedance for an aluminum conduit as a function of frequency 131
C.5 – Mutual inductance and magnetic field for a conduit or cable tray . 131
C.6 – Insulated covers over a conduit . 133

61000-5-2 © IEC:1997 – 9 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_________
ELECTROMAGNETIC COMPATIBILITY (EMC) –
Part 5: Installation and mitigation guidelines –
Section 2: Earthing and cabling
FOREWORD
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