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BS EN IEC 63046:2021

BS EN IEC 63046:2021

$215.11

Nuclear power plants. Electrical power system. General requirements

Published By Publication Date Number of Pages
BSI 2021 94
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1.1 General

This document:

  • 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;

  • 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 subsystems;

  • has to be considered in conjunction with and at the same level as IEC 61513. These two standards provide a complete framework establishing general requirements for instrumentation, control, and Electrical Power System for Nuclear Power Plants.

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;

  • the relationships between:

    • the plant safety requirements and the architecture of the overall Electrical Power System and its sub-systems (see Figure 1) including:

      1. the contribution to the plant Defence in Depth;

      2. the independency and redundancy provisions;

    • the electrical requirements and the architecture of the Electrical Power System and its sub-systems;

    • the functional requirements and the architecture of the Electrical Power System and its sub-systems;

    • the requirements associated with the maintenance strategy and the architecture of the Electrical Power System and its sub-systems;

  • the design of Electrical power sub-systems (e.g. interruptible and uninterruptible);

  • the requirements for supporting systems of Electrical Power System (HVAC, I&C, etc.);

  • the Electrical Power System life-cycle framework.

This document does not cover the specification of:

  • I&C systems;

  • the transmission lines connecting to substations outside the NPP;

  • electrical equipment requirements already defined in the industrial IEC standards;

  • electrical power for security systems (e.g., fences, surveillance systems, entrance control)

  • lighting and socket facility.

This document does not consider power production requirements

NOTE Figure 1 is based on IAEA SSG34:2016, Figure 3, with adaptation regarding the scope.

This figure provides only an example. Various possible arrangements of buses, loads, generators and interconnections would meet the requirements of SSR-2/1. Furthermore, many elements of the plant system, such as buses that are not important to safety and direct current power systems, are not shown. This figure is intended only to represent the relationship between the elements of the plant power systems that are within the safety classification and the preferred power supply. The elements of the preferred power supply that are not within the bounds of the important to safety power supply are outside the scope of the plant safety classification. The system elements included in the important to safety power supplies will differ according to plant design and the classification methods applied in different States. The classification methods are held by IEC 61226. Some plant designs may not require safety standby power sources. All nuclear power plants are expected to have safety direct current power supplies.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
7 English
CONTENTS
10 FOREWORD
12 INTRODUCTION
14 1 Scope
1.1 General
15 Figures
Figure 1 ā€“ Scope of work of this document
16 1.2 Application: new and pre-existing plants
1.3 Framework
1.4 Interaction with level 2 standards
17 Figure 2 ā€“ Architecture of Electrical Power System
18 2 Normative references
19 3 Terms and definitions
28 4 Abbreviated terms
29 5 Overall Electrical Power System life cycle
30 6 Architecture of Electrical Power System: identification of requirements
6.1 Objectives
Figure 3 ā€“ Connections between the overall Electrical Power System life cycleand the life cycles of the electrical power sub- systems
31 6.2 Safety requirements applicable to the electrical architecture design
6.2.1 Defence in Depth
6.2.2 Application of Single Failure Criterion
6.2.3 Management of the Common Cause Failure
6.2.4 Loss Of Off-site Power conditions
32 6.2.5 Station Black Out conditions
6.2.6 Loss of Electrical Power conditions
6.2.7 Application of internal and external Hazards
33 6.2.8 Nuclear security requirements
6.2.9 Classification requirements
6.2.10 Probabilistic requirements
6.3 Electrical requirements
6.3.1 Requirements coordinated with the electric grid operator
34 6.3.2 Electrical disturbances
6.4 Functional performance requirements
35 6.5 Maintenance requirements
7 Design of the electrical architecture
7.1 Objectives
7.2 Safety design provision
7.2.1 Defence in Depth in the Electrical Power System
36 7.2.2 Single Failure in the Electrical Power System
7.2.3 Common Cause Failure in the Electrical Power System
42 7.2.4 Provisions for coping with Loss Of Off-site Power
43 7.2.5 Provisions for coping with Station Black Out
7.2.6 Provisions to avoid or reduce Loss of Electrical Power
7.2.7 Classification consideration
44 7.2.8 Provisions to achieve the reliability target for the Electrical Power System
45 7.3 Electrical design provision
7.3.1 General
7.3.2 Coordination with the grid
7.3.3 Design to achieve electrical requirements
48 Figure 4 ā€“ Typical voltage design bases (IEC 62855)
51 7.4 Functional and performance design provisions
7.4.1 General
7.4.2 Electrical Power System studies
54 7.4.3 Design of the Interruptible Power Supply System
7.4.4 Design of the Uninterruptible Power Supply System
55 7.5 Maintenance
7.5.1 Consideration of the maintenance in the electrical design
56 7.6 Multi-unit shared electrical power systems
7.7 Electrical system layout
7.8 Supporting and associated systems for the Electrical Power System
57 7.9 Overall quality assurance programs
58 7.10 Requirements for output documentation
7.10.1 General
59 7.10.2 Architecture principles
60 7.10.3 Single line diagrams
8 Sub-system requirements
8.1 Electrical Power System basis requirements
8.1.1 General
61 8.1.2 System Design
8.1.3 Single line diagram
8.2 Equipment design specification
8.3 Equipment requirements
8.4 AC Interruptible Electrical Power Supply System
62 8.5 AC/DC Uninterruptible Power Supply System
8.6 Coordination and interaction with power grid
8.7 Earthing
9 Verification of the architecture of the Electrical Power System
9.1 General
9.2 Computerised tools and models verification
9.2.1 Electrical Power System verification
9.2.2 Layout of electrical power systems and equipment verification
63 9.3 Test requirements
64 10 Overall integration and commissioning
10.1 General
10.2 Requirements
65 10.3 Output documentation
11 Overall operation and maintenance
11.1 General
11.2 Requirements
11.3 Output documentation
66 12 System quality assurance plan
12.1 General
12.2 System verification plan
67 12.3 System configuration management plan
12.4 Fault resolution procedures
68 Annex A (informative)Basic safety issues in NPPs
A.1 General
A.2 Plant safety objectives
A.3 Plant safety analysis
A.3.1 General
69 A.3.2 Analysis of event sequences
A.3.3 Assessment of design basis: deterministic/probabilistic methods
A.4 Defence in Depth
71 Table A.1 ā€“ Support of the electrical power supply for the defence in depth of the plant
72 Annex B (informative)AC Interruptible Electrical Power System
B.1 General
B.2 Electrical design provisions
B.2.1 Steady state conditions for Electrical Power System
73 B.2.2 Electrical disturbances
76 B.3 Design of the Interruptible power system
B.3.1 Design of the preferred power supply
B.3.2 Design of the off-site power supply
77 B.3.3 Design of on-site preferred power supply
B.3.4 Design of the AC interruptible power systems important to safety
B.3.5 Design of internal standby sources
78 B.4 Preferred power supply system (from IAEA SSG 34:2016, chapter 6, clauses 6.1 to 6.44)
B.4.1 General
B.4.2 Operation
B.4.3 Grid interface and agreement with grid operator
B.4.4 Reliability of the preferred power supply
79 B.4.5 Off-site power supplies
80 B.4.6 Availability
B.4.7 Independence of off-site circuits
81 B.4.8 Switchyard
B.5 Safety power supply system supporting DBC (from IAEA SSG 34:2016, chapter 7)
B.5.1 General
82 B.5.2 Design (from IAEA SSG 34:2016, chapter 7, clauses 7.36 to 7.63)
84 B.5.3 Testing (from IAEA SSG 34:2016, chapter 7, clauses 7.64 to 7.67)
B.5.4 Performance criteria (transient and dynamic) (from IAEA SSG 34:2016, chapter 7, clauses 7.68 to 7.70)
B.5.5 Relay protection of standby power sources (from IAEA SSG 34:2016, chapter 7, clauses 7.71 to 7.75)
85 B.5.6 Support systems for standby AC power sources
B.5.7 Fuel for standby AC power sources
B.6 Power supply system important to safety supporting DEC
B.6.1 General
86 B.6.2 Design (from IAEA SSG 34:2016, chapter 8, clauses 8.1 to 8.18)
87 B.7 Mobile sources connections network
B.8 Monitoring and switching of buses
89 Annex C (informative)Earthing
90 Annex D (informative)Logic diagram followed for the design of the EPS
91 Bibliography

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BS EN IEC 63046:2021
$215.11