IEC 63298:2024

IEC 63298 ®
Edition 1.0 2024-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Nuclear power plants – Electrical power systems –
Coordination and interaction with electric grid

Centrales nucléaires – Systèmes d'alimentation électrique –
Coordination et interaction avec le réseau électrique
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IEC 63298 ®
Edition 1.0 2024-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Nuclear power plants – Electrical power systems –

Coordination and interaction with electric grid

Centrales nucléaires – Systèmes d'alimentation électrique –

Coordination et interaction avec le réseau électrique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.120.20 ISBN 978-2-8322-9376-8

– 2 – IEC 63298:2024 © IEC 2024
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 8
1.1 General . 8
1.2 Use of this document . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Abbreviated terms . 11
5 Contractual coordination . 12
6 Technical coordination . 12
6.1 General . 12
6.2 Conceptual design of the interface of the NPP with the electric grid . 12
6.3 Exchange of technical information between the NPP operator and the
electric grid operator . 13
6.4 Connection scheme . 13
6.5 Analyses of the interface between the NPP and the electric grid . 14
6.5.1 General . 14
6.5.2 Load flow analyses . 14
6.5.3 Transient stability analyses . 14
6.5.4 Steady state stability analyses . 15
6.5.5 NPP island operation mode analyses (if applicable) . 15
6.5.6 NPP house load operation analyses (if applicable) . 15
6.5.7 NPP flexible operation analyses . 15
6.5.8 NPP electrical transients/faults analyses . 16
6.5.9 Electric grid reliability analyses . 16
6.5.10 Protection setting studies . 16
7 Electric grid – NPP operating procedures . 16
8 Commissioning and testing . 17
8.1 General . 17
8.2 Tests undertaken during commissioning/trial and run phase . 17
9 Coordination during NPP operation . 18
9.1 General . 18
9.2 Short- and long-term planning . 18
9.3 Maintenance . 18
9.4 Analyses . 19
9.5 Testing . 19
Annex A (informative) NPP and electric grid: description of specific features . 20
A.1 General . 20
A.2 NPP . 20
A.3 Electric grid . 21
Annex B (informative) Example of NPP connection schemes to electric grid . 22
Bibliography . 24

Figure B.1 – Connection scheme by 2 lines to a single substation . 22
Figure B.2 – Connection scheme considering multiple substations and lines . 22

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NUCLEAR POWER PLANTS – ELECTRICAL POWER SYSTEMS –
COORDINATION AND INTERACTION WITH ELECTRIC GRID

FOREWORD
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