IEC 63046:2020

IEC 63046 ®
Edition 1.0 2020-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Nuclear power plants – Electrical power system – General requirements

Centrales nucléaires de puissance – Système d'alimentation électrique –
Exigences générales
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IEC 63046 ®
Edition 1.0 2020-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Nuclear power plants – Electrical power system – General requirements

Centrales nucléaires de puissance – Système d'alimentation électrique –

Exigences générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.120.20 ISBN 978-2-8322-8817-7

– 2 – IEC 63046:2020 © IEC 2020
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 9
1.1 General . 9
1.2 Application: new and pre-existing plants . 11
1.3 Framework . 11
1.4 Interaction with level 2 standards . 11
2 Normative references . 13
3 Terms and definitions . 14
4 Abbreviated terms . 23
5 Overall Electrical Power System life cycle . 24
6 Architecture of Electrical Power System: identification of requirements. 25
6.1 Objectives . 25
6.2 Safety requirements applicable to the electrical architecture design . 26
6.2.1 Defence in Depth . 26
6.2.2 Application of Single Failure Criterion . 26
6.2.3 Management of the Common Cause Failure . 26
6.2.4 Loss Of Off-site Power conditions . 26
6.2.5 Station Black Out conditions . 27
6.2.6 Loss of Electrical Power conditions . 27
6.2.7 Application of internal and external Hazards . 27
6.2.8 Nuclear security requirements . 28
6.2.9 Classification requirements . 28
6.2.10 Probabilistic requirements . 28
6.3 Electrical requirements . 28
6.3.1 Requirements coordinated with the electric grid operator . 28
6.3.2 Electrical disturbances . 29
6.4 Functional performance requirements . 29
6.5 Maintenance requirements . 30
7 Design of the electrical architecture . 30
7.1 Objectives . 30
7.2 Safety design provision . 30
7.2.1 Defence in Depth in the Electrical Power System . 30
7.2.2 Single Failure in the Electrical Power System . 31
7.2.3 Common Cause Failure in the Electrical Power System . 31
7.2.4 Provisions for coping with Loss Of Off-site Power . 37
7.2.5 Provisions for coping with Station Black Out . 38
7.2.6 Provisions to avoid or reduce Loss of Electrical Power . 38
7.2.7 Classification consideration . 38
7.2.8 Provisions to achieve the reliability target for the Electrical Power System . 39
7.3 Electrical design provision . 40
7.3.1 General . 40
7.3.2 Coordination with the grid . 40
7.3.3 Design to achieve electrical requirements . 40
7.4 Functional and performance design provisions . 46
7.4.1 General . 46

7.4.2 Electrical Power System studies . 46
7.4.3 Design of the Interruptible Power Supply System . 49
7.4.4 Design of the Uninterruptible Power Supply System . 49
7.5 Maintenance . 50
7.5.1 Consideration of the maintenance in the electrical design . 50
7.6 Multi-unit shared electrical power systems . 51
7.7 Electrical system layout . 51
7.8 Supporting and associated systems for the Electrical Power System . 51
7.9 Overall quality assurance programs . 52
7.10 Requirements for output documentation . 53
7.10.1 General . 53
7.10.2 Architecture principles . 54
7.10.3 Single line diagrams . 55
8 Sub-system requirements . 55
8.1 Electrical Power System basis requirements . 55
8.1.1 General . 55
8.1.2 System Design . 56
8.1.3 Single line diagram . 56
8.2 Equipment design specification . 56
8.3 Equipment requirements . 56
8.4 AC Interruptible Electrical Power Supply System . 56
8.5 AC/DC Uninterruptible Power Supply System . 57
8.6 Coordination and interaction with power grid . 57
8.7 Earthing . 57
9 Verification of the architecture of the Electrical Power System . 57
9.1 General . 57
9.2 Computerised tools and models verification . 57
9.2.1 Electrical Power System verification . 57
9.2.2 Layout of electrical power systems and equipment verification . 57
9.3 Test requirements . 58
...