Nuclear power plants - Electrical power system - General requirements

IEC 63046:2020 provides requirements and recommendations for the overall Electrical Power System. In particular, it covers interruptible and uninterruptible Electrical Power Systems including the systems supplying the I&C systems; This document is consistent and coherent with IEC 61513. Like IEC 61513, this document also highlights the need for complete and precise requirements, derived from the plant safety goals. Those requirements are prerequisites for generating the comprehensive requirements for the overall Electrical Power System architecture, and for the electrical power supply sub-systems. This document establishes the high level specification and requirement to implement a suitable Electrical Power System in a NPP that supports reactor systems important to safety. It also enables electrical energy production providing the transmission grid with active and reactive power and electro-mechanical inertia.

Centrales nucléaires de puissance - Système d'alimentation électrique - Exigences générales

l'IEC 63046:2020 fournit des exigences et des recommandations pour l'ensemble du système d'alimentation électrique. Il couvre en particulier les systèmes d'alimentation électrique interruptibles et sans interruption, y compris les systèmes alimentant les systèmes d'I&C. Le présent document est en conformité et cohérence avec l'IEC 61513. Tout comme l'IEC 61513, le présent document souligne également la nécessité de disposer d'exigences complètes et précises, issues des objectifs de sûreté de la centrale. Ces exigences constituent les conditions préalables à l'établissement des exigences relatives à l'architecture d'ensemble du système d'alimentation électrique, puis à l'établissement de celles portant sur les sous-systèmes d'alimentation électrique. Le présent document établit la spécification et les exigences de haut niveau pour la mise en œuvre d'un système d'alimentation électrique approprié dans une CNP, système qui est le support des systèmes importants pour la sûreté des réacteurs. Il permet également la production d'énergie électrique, fournissant la puissance active et réactive et l'inertie électromécanique du réseau de distribution.

General Information

Status
Published
Publication Date
19-Oct-2020
Current Stage
PPUB - Publication issued
Completion Date
20-Oct-2020
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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
IEC 63046:2020-10(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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

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
---------------------- Page: 3 ----------------------
– 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

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IEC 63046:2020 © IEC 2020 – 3 –

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

10 Overall integration and commissioning .......................................................................... 59

10.1 General ................................................................................................................. 59

10.2 Requirements ....................................................................................................... 59

10.3 Output documentation ........................................................................................... 60

11 Overall operation and maintenance ............................................................................... 60

11.1 General ................................................................................................................. 60

11.2 Requirements ....................................................................................................... 60

11.3 Output documentation ........................................................................................... 60

12 System quality assurance plan ...................................................................................... 61

12.1 General ................................................................................................................. 61

12.2 System verification plan ........................................................................................ 61

12.3 System configuration management plan ................................................................ 62

12.4 Fault resolution procedures ................................................................................... 62

Annex A (informative) Basic safety issues in NPPs .............................................................. 63

A.1 General ................................................................................................................. 63

A.2 Plant safety objectives .......................................................................................... 63

A.3 Plant safety analysis ............................................................................................. 63

A.3.1 General ......................................................................................................... 63

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– 4 – IEC 63046:2020 © IEC 2020

A.3.2 Analysis of event sequences ......................................................................... 64

A.3.3 Assessment of design basis: deterministic/probabilistic methods ................... 64

A.4 Defence in Depth .................................................................................................. 64

Annex B (informative) AC Interruptible Electrical Power System .......................................... 67

B.1 General ................................................................................................................. 67

B.2 Electrical design provisions ................................................................................... 67

B.2.1 Steady state conditions for Electrical Power System ...................................... 67

B.2.2 Electrical disturbances ................................................................................... 68

B.3 Design of the Interruptible power system .............................................................. 71

B.3.1 Design of the preferred power supply ............................................................ 71

B.3.2 Design of the off-site power supply ................................................................ 71

B.3.3 Design of on-site preferred power supply ....................................................... 72

B.3.4 Design of the AC interruptible power systems important to safety .................. 72

B.3.5 Design of internal standby sources ................................................................ 72

B.4 Preferred power supply system (from IAEA SSG 34:2016, chapter 6, clauses

6.1 to 6.44) ........................................................................................................... 73

B.4.1 General ......................................................................................................... 73

B.4.2 Operation ...................................................................................................... 73

B.4.3 Grid interface and agreement with grid operator ............................................ 73

B.4.4 Reliability of the preferred power supply ........................................................ 73

B.4.5 Off-site power supplies .................................................................................. 74

B.4.6 Availability ..................................................................................................... 75

B.4.7 Independence of off-site circuits .................................................................... 75

B.4.8 Switchyard ..................................................................................................... 76

B.5 Safety power supply system supporting DBC ........................................................ 76

B.5.1 General ......................................................................................................... 76

B.5.2 Design (from IAEA SSG 34:2016, chapter 7, clauses 7.36 to 7.63) ................ 77

B.5.3 Testing (from IAEA SSG 34:2016, chapter 7, clauses 7.64 to 7.67)................ 79

B.5.4 Performance criteria (transient and dynamic) (from IAEA SSG 34:2016,

chapter 7, clauses 7.68 to 7.70) ..................................................................... 79

B.5.5 Relay protection of standby power sources (from IAEA SSG 34:2016,

chapter 7, clauses 7.71 to 7.75) ..................................................................... 79

B.5.6 Support systems for standby AC power sources ............................................ 80

B.5.7 Fuel for standby AC power sources ............................................................... 80

B.6 Power supply system important to safety supporting DEC ..................................... 80

B.6.1 General ......................................................................................................... 80

B.6.2 Design (from IAEA SSG 34:2016, chapter 8, clauses 8.1 to 8.18) .................. 81

B.7 Mobile sources connections network ..................................................................... 82

B.8 Monitoring and switching of buses ........................................................................ 82

Annex C (informative) Earthing ............................................................................................ 84

Annex D (informative) Logic diagram followed for the design of the EPS .............................. 85

Bibliography .......................................................................................................................... 86

Figure 1 – Scope of work of this document............................................................................ 10

Figure 2 – Architecture of Electrical Power System ............................................................... 12

Figure 3 – Connections between the overall Electrical Power System life cycle and the

life cycles of the electrical power sub- systems ..................................................................... 25

Figure 4 – Typical voltage design bases (IEC 62855) ............................................................ 43

Table A.1 – Support of the electrical power supply for the defence in depth of the plant ....... 66

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IEC 63046:2020 © IEC 2020 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NUCLEAR POWER PLANTS –
ELECTRICAL POWER SYSTEM –
GENERAL REQUIREMENTS
FOREWORD

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International Standard IEC 63046 has been prepared by subcommittee 45A: Instrumentation,

control and electrical power systems of nuclear facilities, of IEC technical committee 45:

Nuclear instrumentation.
The text of this International Standard is based on the following documents:
FDIS Report on voting
45A/1348/FDIS 45A/1355/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.

---------------------- Page: 7 ----------------------
– 6 – IEC 63046:2020 © IEC 2020

The committee has decided that the contents of this document will remain unchanged until the

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the specific document. At this date, the document will be
• reconfirmed,
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---------------------- Page: 8 ----------------------
IEC 63046:2020 © IEC 2020 – 7 –
INTRODUCTION
a) Technical background, main issues, and organisation of the Standard

The purpose of this standard is to provide the high level specification and requirement to

implement a suitable Electrical Power System in a Nuclear Power Plant (NPP).

The electric power system in NPPs supports reactor systems important to safety. It also

allows electric energy production providing the transmission grid with active and reactive

power and electro-mechanical inertia.

The designers, operators of NPPs (utilities), equipment suppliers, systems evaluators and

licensors, may use this document.

b) Situation of the current Standard in the structure of the IEC SC 45A standard series

The entry point of the IEC SC 45A standard series should be summary report introducing the

two first level standards for I&C (IEC 61513) and the Electrical Power System (IEC 63046).

This document is the first level IEC SC 45A document tackling the issue of general

requirements for Electrical Power System and sub-systems.

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

It is important to note that this Standard establishes no additional functional requirements for

safety systems.

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 NPPs; it covers power supply systems including the supply

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 as
...

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