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IEC 62855:2016

(Main)

Nuclear power plants - Electrical power systems - Electrical power systems analysis

Nuclear power plants - Electrical power systems - Electrical power systems analysis

IEC 62855:2016 provides the electrotechnical engineering guidelines for analysis of AC and DC electrical power systems in nuclear power plants (NPPs) in order to demonstrate that the power sources and the distribution systems have the capability for safe operation and shut down of the NPP, bringing it to a controlled state after an anticipated operational occurrence or accident conditions and finally reaching a safe state. This standard is intended to be used:
- for verification of the design of new nuclear power plants;
- for demonstrating the adequacy and impact of major modifications of electrical power systems in operating nuclear power plants;
- and where there is a requirement to assess and establish operating limits and constraints for existing plants.

Centrales nucléaires de puissance - Systèmes d'alimentation électrique - Analyse des systèmes d'alimentation électrique

L'IEC 62855:2016 donne les directives en matière d'ingénierie électrotechnique pour l'analyse des systèmes électriques de puissance en courant alternatif (CA) et en courant continu (CC) des centrales nucléaires (CNPE). Il s'agit de démontrer que les sources de puissance et le système de distribution électrique peuvent garantir le fonctionnement et l'arrêt sûr de la centrale, de manière à atteindre un état contrôlé après un incident de fonctionnement prévu, puis un état sûr. La présente norme a pour objectif d'être utilisée:
- pour vérifier la conception des nouvelles centrales nucléaires de puissance;
- pour démontrer la pertinence et l'impact de modifications majeures apportées aux systèmes électriques des CNPE en exploitation;
- lorsque les centrales existantes font l'objet d'une exigence d'évaluation et d'établissement des limites ainsi que des contraintes de fonctionnement.

General Information

Status
Published
Publication Date
29-Aug-2016
ICS
01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
27.120.20 - Nuclear power plants. Safety
Technical Committee
SC 45A - Instrumentation, control and electrical power systems of nuclear facilities
Drafting Committee
WG 11 - TC 45/SC 45A/WG 11
Current Stage
PPUB - Publication issued
Start Date
30-Sep-2016
Completion Date
30-Aug-2016
Ref Project

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IEC 62855:2016 - Nuclear power plants - Electrical power systems - Electrical power systems analysis
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IEC 62855 ®
Edition 1.0 2016-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Nuclear power plants – Electrical power systems – Electrical power systems
analysis
Centrales nucléaires de puissance – Systèmes d’alimentation électrique –
Analyse des systèmes d’alimentation électrique

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IEC 62855 ®
Edition 1.0 2016-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Nuclear power plants – Electrical power systems – Electrical power systems

analysis
Centrales nucléaires de puissance – Systèmes d’alimentation électrique –

Analyse des systèmes d’alimentation électrique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.120.20 ISBN 978-2-8322-3589-8

– 2 – IEC 62855:2016  IEC 2016
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 10
2 Normative references. 11
3 Terms and definitions . 11
4 Symbols and abbreviations . 12
5 Electrical power system analyses . 13
5.1 Overview of typical studies . 13
5.1.1 Transient stability analyses . 13
5.1.2 Load flow studies . 13
5.1.3 Transient and dynamic studies . 13
5.1.4 Short circuit studies . 14
5.1.5 Electrical protection coordination and selectivity . 14
5.1.6 Lightning protection studies . 14
5.2 Applicability of analyses to different plant states . 14
5.2.1 General . 14
5.2.2 Recommendations . 14
5.3 Selection, verification and validation of analytical tools . 15
5.3.1 General . 15
5.3.2 Recommendations . 16
5.4 Electrical power system model . 17
5.5 Grid and NPP connection . 17
5.6 Updating of system analyses . 17
5.7 Prerequisites for the performance of electrical studies . 17
5.8 Acceptance requirements . 18
6 Off-site power transient stability analyses . 18
6.1 General . 18
6.2 Recommendation . 18
6.3 Acceptance requirements . 18
7 AC on-site power system analyses . 18
7.1 General . 18
7.2 Load flow studies . 19
7.2.1 General . 19
7.2.2 Recommendations . 19
7.2.3 Acceptance requirements . 19
7.3 Transient studies . 19
7.3.1 General . 19
7.3.2 Faulted conditions . 19
7.3.3 Bus transfer studies . 20
7.3.4 Motor starting and reacceleration studies . 21
7.3.5 House load operation . 22
7.3.6 Voltage disturbances . 22
7.3.7 Voltage surge caused by switching and malfunctions . 23
7.3.8 Load sequencer studies . 23
7.3.9 Frequency studies . 24
7.4 Fault studies . 24

7.4.1 Short-circuit studies . 24
7.4.2 Earth fault (degraded insulation) studies . 25
7.5 Electrical protection coordination studies . 25
7.5.1 Recommendations . 25
7.5.2 Acceptance requirements . 26
8 DC system and uninterruptible AC system analyses . 26
8.1 Load flow studies . 26
8.1.1 General . 26
8.1.2 Recommendations . 26
8.1.3 Acceptance requirements . 27
8.2 Transient studies . 27
8.2.1 Rectifier . 27
8.2.2 Inverter/UPS and bypass switch . 27
8.3 Fault studies . 28
8.3.1 Short circuit studies . 28
8.3.2 Earth fault (degraded insulation) studies . 28
8.4 Electrical protection coordination studies . 28
8.4.1 Recommendations . 28
8.4.2 Acceptance requirements . 29
9 Miscellaneous analyses . 29
9.1 Lightning protection studies . 29
9.1.1 General . 29
9.1.2 Recommendation .
...

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