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EN IEC 61225:2020

(Main)

Nuclear power plants - Instrumentation, control and electrical power systems - Requirements for static uninterruptible DC and AC power supply systems

Nuclear power plants - Instrumentation, control and electrical power systems - Requirements for static uninterruptible DC and AC power supply systems

IEC 61225:2019 specifies the performance and the functional characteristics of the low voltage static uninterruptible power supply (SUPS) systems in a nuclear power plant and, for applicable parts, in general for nuclear facilities. An uninterruptible power supply is an electrical equipment which draws electrical energy from a source, stores it and maintains supply in a specified form by means inside the equipment to output terminals. A static uninterruptible power supply (SUPS) has no rotating parts to perform its functions. This third edition cancels and replaces the second edition published in 2005. This edition includes the following significant technical changes with respect to the previous edition: a) the principal objective of this edition is to address the requirements on the static uninterruptible power supplies in nuclear power plants; b) in addition to Instrumentation and Control (I&C) power supplies include all static uninterruptible power supplies; c) emphasize that the static uninterruptible power supplies shall protect the connected equipment (loads) from transients on the on-site AC distribution system (the immunity concept); d) in accordance with the defence-in-depth concept, this standard applies to static uninterruptible power supplies for all equipment, not only for equipment important to safety, with a graded approach to verification and validation; e) addition of the requirement that, when batteries are connected in parallel under abnormal operating conditions, they shall be properly protected with isolation devices to avoid any failure that may impair more than one division of the uninterruptible power supply.

Kernkraftwerke - Leittechnische Systeme und elektrische Stromversorgungssysteme - Anforderungen an statische unterbrechungsfreie Gleich- und Wechselstrom-Energieversorgungssysteme

Centrales nucléaire de puissance - Systèmes d'instrumentation, de contrôle-commande et d'alimentation électrique - Exigences pour les systèmes d'alimentation en courant alternatif et en courant continu statiques sans interruption

See the scope of IEC 61225:2019. Adoption of IEC 61225 is to be done without modification.

Nuklearne elektrarne - Merilni, nadzorni in elektroenergetski sistemi - Zahteve za statične neprekinjene enosmerne in izmenične napajalne sisteme (IEC 61225:2019)

General Information

Status
Published
Publication Date
26-Mar-2020
ICS
27.120.20 - Nuclear power plants. Safety
Technical Committee
CLC/TC 45AX - Nuclear power plants
Drafting Committee
CLC/TC 45AX - Nuclear power plants
Current Stage
6060 - Document made available - Publishing
Start Date
27-Mar-2020
Due Date
02-Oct-2021
Completion Date
27-Mar-2020
Ref Project
SIST EN IEC 61225:2020 - Nuclear power plants - Instrumentation, control and electrical power systems - Requirements for static uninterruptible DC and AC power supply systems (IEC 61225:2019)

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SLOVENSKI STANDARD
01-junij-2020
Nuklearne elektrarne - Merilni, nadzorni in elektroenergetski sistemi - Zahteve za
statične neprekinjene enosmerne in izmenične napajalne sisteme (IEC 61225:2019)
Nuclear power plants - Instrumentation, control and electrical power systems -
Requirements for static uninterruptible DC and AC power supply systems (IEC
61225:2019)
Centrales nucléaire de puissance - Systèmes d'instrumentation, de contrôle-commande
et d'alimentation électrique - Exigences pour les systèmes d'alimentation en courant
alternatif et en courant continu statiques sans interruption (IEC 61225:2019)
Ta slovenski standard je istoveten z: EN IEC 61225:2020
ICS:
27.120.20 Jedrske elektrarne. Varnost Nuclear power plants. Safety
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61225

NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2020
ICS 27.120.20
English Version
Nuclear power plants - Instrumentation, control and electrical
power systems - Requirements for static uninterruptible DC and
AC power supply systems
(IEC 61225:2019)
Centrales nucléaire de puissance - Systèmes To be completed
d'instrumentation, de contrôle-commande et d'alimentation (IEC 61225:2019)
électrique - Exigences pour les systèmes d'alimentation en
courant alternatif et en courant continu statiques sans
interruption
(IEC 61225:2019)
This European Standard was approved by CENELEC on 2020-02-17. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61225:2020 E
European foreword
This document (EN IEC 61225:2020) consists of the text of IEC 61225:2019 prepared by IEC/TC 45
"Nuclear instrumentation".
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2020-09-17
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2020-09-17
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
As stated in the nuclear safety directive 2009/71/EURATOM, Chapter 1, Article 2, item 2, Member
States are not prevented from taking more stringent safety measures in the subject-matter covered by
the Directive, in compliance with Community law. In a similar manner, this European standard does
not prevent Member States from taking more stringent nuclear safety and security measures in the
subject-matter covered by this standard.
Endorsement notice
The text of the International Standard IEC 61225:2019 was approved by CENELEC as a European
Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 60964 NOTE Harmonized as EN IEC 60964
IEC 61000-6-2 NOTE Harmonized as EN IEC 61000-6-2
IEC 61000-6-4 NOTE Harmonized as EN IEC 61000-6-4
IEC 61226 NOTE Harmonized as EN 61226
IEC 62040-3 NOTE Harmonized as EN 62040-3
IEC 62340 NOTE Harmonized as EN 62340

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60038 (mod) -  IEC standard voltages EN 60038 -
IEC 60146-1-1 -  Semiconductor converters - General EN 60146-1-1 -
requirements and line commutated
converters - Part 1-1: Specification of basic
requirements
IEC 60146-2 -  Semiconductor converters - Part 2: Self-EN 60146-2 -
commutated semiconductor converters
including direct d.c. converters
IEC 60364-4-41 -  Low-voltage electrical installations - Part 4-HD 60364-4-41 -
(mod) 41: Protection for safety - Protection
against electric shock
+A11 2017
+A12 2019
IEC 60709 -  EN IEC 60709 -
IEC 60880 -  Nuclear power plants - Instrumentation and EN 60880 -
control systems important to safety -
Software aspects for computer-based
systems performing category A functions
IEC 60980 -  Recommended practices for seismic - -
qualification of electrical equipment of the
safety system for nuclear generating
stations
IEC 61000-1 series Electromagnetic compatibility (EMC) - PartE N 61000-1 series
1-2: General - Methodology for the
achievement of functional safety of
electrical and electronic systems including
equipment with regard to electromagnetic
phenomena
IEC 61508 series Functional safety of EN 61508 series
electrical/electronic/programmable
electronic safety-related systems - Part 1:
General requirements (see href="http://www.iec.ch/functionalsafety">F
unctional Safety and IEC 61508)
IEC 61513 -  Nuclear power plants - Instrumentation and EN 61513 -
control important to safety - General
requirements for systems
IEC 62003 -  Nuclear power plants - Instrumentation and - -
Publication Year Title EN/HD Year
control important to safety - Requirements
for electromagnetic compatibility testing
IEC 62040 series Uninterruptible power systems (UPS) - PartEN IEC 62040 series
1: Safety requirements
+prAA
IEC 62138 -  Nuclear power plants - Instrumentation and EN IEC 62138 -
control systems important to safety -
Software aspects for computer-based
systems performing category B or C
functions
IEC 62566 -  Nuclear power plants - Instrumentation and EN 62566 -
control important to safety - Development
of HDL-programmed integrated circuits for
systems performing category A functions
IEC/IEEE 60780--  EN 60780-323 -
IEC 61225 ®
Edition 3.0 2019-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Nuclear power plants – Instrumentation, control and electrical power systems –

Requirements for static uninterruptible DC and AC power supply systems

Centrales nucléaires de puissance – Systèmes d'instrumentation, de contrôle-

commande et d'alimentation électrique – Exigences pour les systèmes

d'alimentation en courant alternatif et en courant continu statiques sans

interruption
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.120.20 ISBN 978-2-8322-6382-2

– 2 – IEC 61225:2019 © IEC 2019
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Abbreviated terms . 11
5 System requirements . 11
5.1 General . 11
5.2 Function and description . 12
5.2.1 Preamble . 12
5.2.2 Designations . 14
5.2.3 Direct current systems . 14
5.2.4 Alternating current systems . 14
5.3 System divisions . 15
5.4 System boundaries . 15
6 Functional requirements for static uninterruptible power supplies . 15
6.1 Static uninterruptible power supplies for systems important to safety . 15
6.2 Batteries and battery chargers . 16
6.3 Inverters and bypass switches . 17
6.4 UPS . 18
6.5 Converters used for voltage stabilization . 18
6.6 I&C power supply using DC/DC-converters and AC/DC-converters . 19
7 Requirements for distribution systems . 19
7.1 System aspects . 19
7.2 Load allocation . 19
7.3 Electrical aspects . 21
7.4 Earthing . 22
8 Effects of loads on supply quality. 22
8.1 General . 22
8.2 Electromagnetic interference. 22
8.3 Transients . 22
8.4 Load current . 23
8.5 Power supplies to loads of lower safety classification. 23
9 Monitoring and protection . 23
9.1 General . 23
9.2 Monitoring . 24
9.3 Electrical protection . 24
10 Qualification of equipment . 25
11 Design to cope with ageing . 25
12 Testing . 25
13 Maintenance . 26
Annex A (informative)  Examples of voltage input variations . 27
Annex B (informative) Examples of specifications . 29
B.1 Example 1: Specification for an DC power supply for equipment requiring a
non-interruptible supply. 29
...

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