EN IEC 62566-2:2020
(Main)Nuclear power plants - Instrumentation and control systems important to safety - Development of HDL-programmed integrated circuits - Part 2: HDL-programmed integrated circuits for systems performing category B or C functions
Nuclear power plants - Instrumentation and control systems important to safety - Development of HDL-programmed integrated circuits - Part 2: HDL-programmed integrated circuits for systems performing category B or C functions
See the scope of IEC 62566-2:2020. Adoption of IEC 62566-2:2020 is to be done without modification.
Kernkraftwerke - Leittechnik für Systeme mit sicherheitstechnischer Bedeutung - Entwicklung HDL-programmierter integrierter Schaltkreise - Teil 2: HDL-programmierte integrierte Schaltkreise für Systeme, die Funktionen der Kategorie B oder C ausführen
Centrales nucléaires de puissance - Instrumentation et contrôle-commande importants pour la sûreté - Développement des circuits intégrés programmés en HDL - Partie 2: Circuits intégrés programmés en HDL pour les systèmes réalisant des fonctions de catégorie B ou C
l'IEC 62566-2:2020 énonce des exigences pour atteindre une haute fiabilité dans les "circuits intégrés programmés en HDL" (HPD) destinés aux systèmes d'I&C des centrales nucléaires de puissance réalisant des fonctions de sûreté de catégorie B ou C telles que définies par l'IEC 61226. La programmation des HPD repose sur des langages de description de matériel (HDL) et des outils logiciels associés. Les HPD sont typiquement basés sur des réseaux de portes programmables sur site (FPGA) vierges ou sur des technologies microélectroniques similaires telles que les réseaux logiques programmables (PLD), les réseaux logiques programmables complexes (CPLD), etc. Les circuits intégrés d'usage général tels que les microprocesseurs ne sont pas des HPD. Le présent document énonce des exigences sur: a) un cycle de vie de HPD dédié concernant chaque phase du développement des HPD, notamment la spécification des exigences, la conception, la réalisation, l'intégration et la validation, ainsi que les activités de vérification associées à chacune des phases; b) la planification et les activités complémentaires telles que la modification et la production; c) le choix des composants prédéveloppés, notamment les technologies microélectroniques et les blocs prédéveloppés (PDB); d) les outils utilisés pour concevoir, réaliser et vérifier les HPD.
Jedrske elektrarne - Merilna in nadzorna oprema za zagotavljanje varnosti - Razvoj HDL-programiranih integriranih vezij - 2. del: HDL-programirana integrirana vezja za sisteme, ki izvajajo funkcije kategorije B ali C (IEC 62566-2:2020)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2021
Jedrske elektrarne - Merilna in nadzorna oprema za zagotavljanje varnosti - Razvoj
HDL-programiranih integriranih vezij - 2. del: HDL-programirana integrirana vezja
za sisteme, ki izvajajo funkcije kategorije B ali C (IEC 62566-2:2020)
Nuclear power plants - Instrumentation and control systems important to safety -
Development of HDL-programmed integrated circuits - Part 2: HDL-programmed
integrated circuits for systems performing category B or C functions (IEC 62566-2:2020)
Kernkraftwerke – Leittechnik für Systeme mit sicherheitstechnischer Bedeutung –
Entwicklung HDL-programmierter integrierter Schaltkreise - Teil 2: HDL-programmierte
integrierte Schaltkreise für Systeme, die Funktionen der Kategorie B oder C ausführen
(IEC 62566-2:2020)
Centrales nucléaires de puissance – Instrumentation et contrôle-commande importants
pour la sûreté – Développement des circuits intégrés programmés en HDL – Partie 2:
Circuits intégrés programmés en HDL pour les systèmes réalisant des fonctions de
catégorie B ou C (IEC 62566-2:2020)
Ta slovenski standard je istoveten z: EN IEC 62566-2:2020
ICS:
27.120.20 Jedrske elektrarne. Varnost Nuclear power plants. Safety
31.200 Integrirana vezja, Integrated circuits.
mikroelektronika Microelectronics
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 62566-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2020
ICS 27.120.20
English Version
Nuclear power plants - Instrumentation and control systems
important to safety - Development of HDL-programmed
integrated circuits - Part 2: HDL-programmed integrated circuits
for systems performing category B or C functions
(IEC 62566-2:2020)
Centrales nucléaires de puissance - Instrumentation et Kernkraftwerke - Leittechnik für Systeme mit
contrôle-commande importants pour la sûreté - sicherheitstechnischer Bedeutung - Entwicklung HDL-
Développement des circuits intégrés programmés en HDL - programmierter integrierter Schaltkreise - Teil 2: HDL-
Partie 2: Circuits intégrés programmés en HDL pour les programmierte integrierte Schaltkreise für Systeme, die
systèmes réalisant des fonctions de catégorie B ou C Funktionen der Kategorie B oder C ausführen
(IEC 62566-2:2020) (IEC 62566-2:2020)
This European Standard was approved by CENELEC on 2020-11-16. 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 62566-2:2020 E
European foreword
This document (EN IEC 62566-2:2020) consists of the text of document IEC 62566-2:2020, prepared by
IEC/SC 45A "Instrumentation and control of nuclear facilities" of IEC/TC 45 "Nuclear instrumentation".
The following dates are fixed:
• latest date by which this document has to be (dop) 2021-11-16
implemented at national level by publication of an
identical national standard or by endorsement
• latest date by which the national standards (dow) 2023-11-16
conflicting with this 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/or security measures in the subject-matter covered by this standard.
Endorsement notice
The text of the International Standard IEC 62566-2:2020 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/IEEE 60780-323:2016 NOTE Harmonized as EN 60780-323:2017 (not modified)
IEC 61508-1:2010 NOTE Harmonized as EN 61508-1:2010 (not modified)
IEC 61508-2:2010 NOTE Harmonized as EN 61508-2:2010 (not modified)
IEC 61508-3:2010 NOTE Harmonized as EN 61508-3:2010 (not modified)
IEC 61508-4:2010 NOTE Harmonized as EN 61508-4:2010 (not modified)
IEC 62645 NOTE Harmonized as EN IEC 62645
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 When 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 60880 2006 Nuclear power plants - Instrumentation and EN 60880 2009
control systems important to safety -
Software aspects for computer-based
systems performing category A functions
IEC 60987 - Nuclear power plants - Instrumentation and EN 60987 -
control important to safety - Hardware
design requirements for computer-based
systems
IEC 61226 - Nuclear power plants - Instrumentation and EN 61226 -
control important to safety - Classification of
instrumentation and control functions
IEC 61513 2011 Nuclear power plants - Instrumentation and EN 61513 2013
control important to safety - General
requirements for systems
IEC 62138 2018 Nuclear power plants - Instrumentation and EN IEC 62138 2019
control systems important to safety -
Software aspects for computer-based
systems performing category B or C
functions
IEC 62340 - Nuclear power plants - Instrumentation and EN 62340 -
control systems important to safety -
Requirements for coping with common
cause failure (CCF)
IEC 62566 2012 Nuclear power plants - Instrumentation and EN 62566 2014
control important to safety - Development of
HDL-programmed integrated circuits for
systems performing category A functions
IEC 62566-2 ®
Edition 1.0 2020-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Nuclear power plants – Instrumentation and control important to safety –
Development of HDL-programmed integrated circuits –
Part 2: HDL-programmed integrated circuits for systems performing
category B or C functions
Centrales nucléaires de puissance – Instrumentation et contrôle-commande
importants pour la sûreté – Développement des circuits intégrés programmés
en HDL –
Partie 2: Circuits intégrés programmés en HDL pour les systèmes réalisant
des fonctions de catégorie B ou C
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.120.20 ISBN 978-2-8322-8032-4
– 2 – IEC 62566-2:2020 © IEC 2020
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 10
2 Normative references . 11
3 Terms and definitions . 11
4 Symbols and abbreviated terms . 18
5 General requirements for HPD projects . 19
5.1 General . 19
5.2 Life-cycle . 19
5.3 Gradation principals . 21
5.4 HPD quality assurance . 22
5.4.1 General . 22
5.5 Configuration management . 23
5.5.1 General . 23
5.6 HPD Verification . 23
6 HPD requirements specification . 24
6.1 General . 24
6.1.1 Overview . 24
6.2 Functional aspects of the requirements specification . 25
6.2.1 General . 25
6.3 Fault detection and fault tolerance . 26
6.4 Requirements capture using Electronic System Level tools . 26
6.4.1 General . 26
6.4.2 Requirements on the formalism of tools used at ESL level . 27
6.4.3 Interface with design tools . 27
7 Acceptance process for programmable integrated circuits, native blocks and Pre-
Developed Blocks . 27
7.1 General . 27
7.2 Acceptance process for programmable integrated circuits and included
native blocks . 27
7.2.1 General . 27
7.2.2 Integrated Circuit acceptance . 28
7.3 Acceptance process for PDBs . 29
7.3.1 General . 29
7.3.2 PDB functional suitability . 29
7.3.3 Documentation for safety of PDBs . 30
7.3.4 Generation of supporting documentation for safety . 30
7.3.5 Complementary means . 32
7.3.6 Rules of use . 32
7.3.7 Modification for acceptance . 33
8 HPD design and implementation . 33
8.1 General . 33
8.2 Hardware Description Languages (HDL) and related tools . 33
8.2.1 General . 33
8.3 Design . 33
8.3.1 General . 33
IEC 62566-2:2020 © IEC 2020 – 3 –
8.3.2 Fault detection . 35
8.3.3 Language and coding rules . 35
8.3.4 Synchronous vs. asynchronous design . 36
8.3.5 Power Management . 37
8.3.6 Design documentation . 37
8.4 Implementation . 37
8.4.1 Products . 37
8.4.2 Files of parameters and constraints . 37
8.4.3 Post-route analyses . 37
8.4.4 Redundancies introduced or removed by the tools . 38
8.4.5 Finite state machines . 38
8.4.6 Static Timing Analysis . 38
8.4.7 Implementation documentation . 38
8.5 System level tools and automated code generation . 39
8.5.1 General . 39
9 HPD integration and testing . 39
9.1 General . 39
9.2 Test-benches for HPD functional simulation . 40
9.3 Test coverage . 40
9.4 Test execution . 41
10 HPD aspects of system integration . 41
10.1 General . 41
10.2 Requirements . 41
11 HPD aspects of system validation . 42
11.1 General . 42
11.2 Requirements . 42
12 Modification . 43
12.1 Modification of the requirements, design or implementation . 43
12.1.1 General . 43
12.2 Modification of the micro-electronic technology . 45
13 HPD production . 45
13.1 General . 45
13.2 Production tests . 45
13.3 Programming files and programming activities . 45
14 HPD aspects of installation, commissioning and operation . 46
14.1 General . 46
14.1.1 Overview . 46
14.2 Anomaly reports . 46
15 Software tools for the development of HPDs . 46
15.1 General . 46
15.1.1 Overview . 46
15.2 Additional requirements for design, implementation and simulation tools . 47
16 Design segmentation or partitioning . 48
16.1 Background. 48
16.2 Auxiliary or support functions . 48
16.2.1 General . 48
16.2.2 Partitioning of auxiliary or support functions or functions of an inferior
safety category . 48
– 4 – IEC 62566-2:2020 © IEC 2020
17 Defences against HPD Common Cause Failure . 49
Annex A (informative) Documentation . 50
A.1 General . 50
A.2 Project . 50
A.3 HPD requirement specification . 50
A.4 Acceptance of blank integrated circuits, Native Blocks and PDBs . 50
A.5 HPD design and implementation . 50
A.6 HPD integration and testing . 51
A.7 HPD aspects of system integration. 51
A.8 HPD aspects of system validation . 51
A.9 Modification . 51
A.10 HPD production . 51
A.11 Software tools for the development of HPDs . 51
Annex B (informative) Development of HPDs . 52
B.1 General . 52
B.2 Optional capture of requirements at Electronic System Level . 52
B.3 HPD and system life-cycle . 52
B.4 Design . 53
B.5 Acceptance process for programmable integrated circuits, native blocks and
Pre-Developed Blocks . 54
B.6 Implementation . 54
B.7 HPD integration and testing . 55
B.8 Types of specific integrated circuits . 55
B.8.1 General . 55
B.8.2 PAL (Programmable Array Logic) . 56
B.8.3 PLD, CPLD (Programmable Logic Device, Complex PLD) . 56
B.8.4 FPGA . 56
B.8.5 Gate Array, or pre-diffused integrated circuit . 57
B.8.6 Standard Cells . 57
B.8.7 “Full custom ASIC”, or “raw ASIC” . 57
Bibliography . 58
Figure 1 – System life-cycle (informative, as defined by IEC 61513) . 20
Figure 2 – HPD life-cycle . 21
Figure 3 – Overview of selection and acceptance process for blank Integrated Circuits
and native blocks . 28
Figure 4 – Overview of selection and acceptance process for PDBs . 29
IEC 62566-2:2020 © IEC 2020 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NUCLEAR POWER PLANTS –
INSTRUMENTATION AND CONTROL IMPORTANT TO SAFETY –
DEVELOPMENT OF HDL-PROGRAMMED INTEGRATED CIRCUITS –
Part 2: HDL-programmed integrated circuits
for systems performing category B or C functions
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62566-2 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/1304/FDIS 45A/1314/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.
– 6 – IEC 62566-2:2020 © IEC 2020
A list of all parts in the IEC 62566 series, published under the general title Nuclear power plants
– Instrumentation and control important to safety – Development of HDL-programmed
integrated circuits, can be found on the IEC website.
In this document, the following print types are used:
– Requirements and recommendations applicable specifically to class 3 or to class 2 systems
appear in italics.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IEC 62566-2:2020 © IEC 2020 – 7 –
INTRODUCTION
a) Technical background, main issues and organisation of the Standard
Electronic systems performing category B and C functions (according to IEC 61226) used in
Nuclear Power Plants (NPPs) need to be fully validated and qualified according to their safety
class. This International Standard provides requirements for the development of class 2 or 3
HDL (Hardware Description Language) Programmed Devices (HPDs) performing category B or
C functions as defined by IEC 61226. It complements IEC 62566 which provides requirements
for the development of HPDs performing category A functions.
In computer-based systems, a separation can be drawn between the hardware and software
portions. The hardware is mainly designed with standardised components having pre-defined
electronic functions such as microprocessors, timers or network controllers, whereas software
is used to coordinate the different parts of the hardware and to implement the application
functions.
I&C designers might build application functions using integrated circuits such as FPGAs or
similar technologies. The function of such an integrated circuit is not defined by the supplier of
the physical component or micro-electronic technology but by the I&C designer.
The specific integrated circuits addressed by this Standard are:
a) based on pre-developed micro-electronic technologies,
b) developed within an I&C project,
c) developed in Hardware Description Languages (HDL) by using appropriate and compatible
development tools.
Therefore these circuits are named “HDL-Programmed Devices”, (HPD). The HDL statements
which describe a HPD can include the instantiation of Pre-Developed Blocks (PDB) which are
typically provided as libraries, macros, or intellectual property cores.
HPDs can be effective solutions to implement functions required by an I&C project. However,
the verification and validation might be limited by issues such as high number of internal paths
and limited observability, if the HPD has not been developed with verifiability in mind.
In order to achieve the reliability required for safety I&C systems, the development of HPDs
shall comply with strict process and technical requirements such as those provided by this
Standard, including the specification of requirements, the selection of blank integrated circuits
and PDBs, the design and implementation, the verification, and the procedures for operation
and maintenance.
It is intended that this Standard be used by HPD designers, operators of NPPs (utilities), and
by regulators. Regulatory bodies will find guidance to assess important aspects such as design,
implementation, verification and validation of HPDs.
b) Situation of the current Standard in the structure of the IEC SC 45A standard series
IEC 61513 is a first level IEC SC 45A document and gives guidance applicable to I&C at the
system level. It is supplemented by guidance at the hardware level (IEC 60987), software level
(IEC 60880 and IEC 62138) and HPD level (IEC 62566 and IEC 62566-2). IEC 62340 gives
requirements in order to reduce and overcome the possibility of common cause failure of
category A functions.
– 8 – IEC 62566-2:2020 © IEC 2020
IEC 62566-2 is a second level IEC SC 45A document which focuses on the activities when
HPDs performing category B or C functions are developed. For HPDs performing category B
functions, it complements IEC 60987 which deals with the generic issues of hardware design
of computer-based systems.
c) Recommendations and limitations regarding the application of the Standard
It is important to note that this Standard establishes no additional functional requirements for
safety systems.
Aspects for which special requirements and recommendations have been produced are:
a) an approach to specify the requirements of, to design, to implement and to verify “HDL-
Programmed Devices” (HPD, 3.20), and to handle the corresponding aspects of system
integration and validation;
b) an approach to analyse and select the blank integrated circuits, micro-electronic
technologies and Pre-Developed Blocks (PDB, 3.29) used to develop HPDs;
c) procedures for the modification and configuration control of HPDs;
d) requirements for selection and use of software tools used to develop HPDs.
It is recognized that digital technology is continuing to develop at a rapid pace and that it is not
possible for a Standard such as this one to include references to all modern design technologies
and techniques.
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. If new techniques are developed
then it should be possible to assess the suitability of such techniques by applying the safety
principles contained within this Standard.
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 aspects for programmable digital systems, coordination
of safety and security requirements and management of ageing. The standards referenced
directly at this second level should be considered together with IEC 61513 and IEC 63046 as a
consistent document set.
At a third level, IEC SC 45A standards not directly referenced by IEC 61513 or by IEC 63046
are standards related to specific equipment, technical methods, or specific activities. Usually
these documents, which make reference to second-level documents for general topics, can be
used on their own.
A fourth level extending the IEC SC 45 standard series, corresponds to the Technical Reports
which are not normative.
IEC 62566-2:2020 © IEC 2020 – 9 –
The IEC SC 45A standards series consistently implements and details the safety and security
principles and basic aspects provided in the relevant IAEA safety standards and in the relevant
documents of the IAEA Nuclear Security Series (NSS). In particular this includes the IAEA
requirements SSR-2/1, establishing safety requirements related to the design of Nuclear Power
Plants (NPPs), the IAEA safety guide SSG-30 dealing with the safety classification of structures,
systems and components in NPPs, the IAEA safety guide SSG-39 dealing with the design of
instrumentation and control systems for NPPs, the IAEA safety guide SSG-34 dealing with the
design of electrical power systems for NPPs and the implementing guide NSS17 for computer
security at nuclear facilities. The safety and security terminology and definitions used by
SC 45A standards are consistent with those used by the IAEA.
IEC 61513 and IEC 63046 have adopted a presentation format similar to the basic safety
publication IEC 61508 with an overall life-cycle framework and a system life-cycle framework.
Regarding nuclear safety, IEC 61513 and IEC 63046 provide the interpretation of the general
requirements of IEC 61508-1, IEC 61508-2 and IEC 61508-4, for the nuclear application sector.
In this framework IEC 60880, IEC 62138 and IEC 62566 correspond to IEC 61508-3 for the
nuclear application sector. IEC 61513 and IEC 63046 refer to ISO as well as to IAEA GS-R part
2 and IAEA GS-G-3.1 and IAEA GS-G-3.5 for topics related to quality assurance (QA). At level
2, regarding nuclear security, IEC 62645 is the entry document for the IEC/SC 45A security
standards. It builds upon the valid high level principles and main concepts of the generic
security standards, in particular ISO/IEC 27001 and ISO/IEC 27002; it adapts them and
completes them to fit the nuclear context and coordinates with the IEC 62443 series. At level 2,
IEC 60964 is the entry document for the IEC/SC 45A control rooms standards and IEC 62342
is the entry document for the ageing management standards.
NOTE 1 It is assumed that for the design of I&C systems in NPPs that implement conventional safety functions (e.g.
to address worker safety, asset protection, chemical hazards, process energy hazards) international or national
standards would be applied.
NOTE 2 IEC/SC 45A domain was extended in 2013 to cover electrical systems. In 2014 and 2015 discussions were
held in IEC/SC 45A to decide how and where general requirement for the design of electrical systems were to be
considered. IEC/SC 45A experts recommended that an independent standard be developed at the same level as
IEC 61513 to establish general requirements for electrical systems. Project IEC 63046 is now launched to cover this
objective. When IEC 63046 is published this NOTE 2 of the introduction of IEC/SC 45A standards will be suppressed.
– 10 – IEC 62566-2:2020 © IEC 2020
NUCLEAR POWER PLANTS –
INSTRUMENTATION AND CONTROL IMPORTANT TO SAFETY –
DEVELOPMENT OF HDL-PROGRAMMED INTEGRATED CIRCUITS –
Part 2: HDL-programmed integrated circuits
for systems performing category B or C functions
1 Scope
This part of IEC 62566 provides requirements for achieving highly reliable HDL-Programmed
Devices (HPDs), for use in I&C systems of nuclear power plants performing functions of safety
category B or C as defined by IEC 61226.
The programming of HPDs relies on Hardware Description Languages (HDL) and related
software tools. They are typically based on blank Field Programmable Gate Arrays (FPGAs) or
similar micro-electronic technologies such as Programmable Logic Devices (PLD), Complex
Programmable Logic Devices (CPLDs), etc. General purpose integrated circuits such as
microprocessors are not HPDs. Annex B.8 provides descriptions of a number of different types
of integrated circuits.
This document provides requirements on:
a) a dedicated HPD life-cycle addressing each phase of the development of HPDs, including
specification of requirements, design, implementation, integration and validation, as well as
verification activities associated with each phase,
b) planning and complementary activities such as modification and production,
c) selection of pre-developed components. This includes micro-electronic technologies and
Pre-Developed Blocks (PDBs),
d) tools used to design, implement and verify HPDs.
This document does not put requirements on the development of the micro-electronic
technologies, which are usually available as "commercial off-the-shelf" items and are not
developed under nuclear quality assurance standards. It addresses the developments made
with these micro-electronic technologies in an I&C project with HDLs and related tools.
This document provides guidance to avoid as far as possible latent faults remaining in HPDs,
and to reduce the susceptibility to single failures as well as to potential Common Cause Failures
(CCFs).
Reliability aspects related to environmental qualification and failures due to ageing or physical
degradation are not handled in this document. Other standards, especially IEC 60987,
IEC/IEEE 60780-323 and IEC 62342, address these topics.
This document does not cover cybersecurity for HDL aspects of I&C systems. IEC 62645
provides requirements for security programmes for I&C programmable digital systems.
This document provides guidance and requirements to produce verifiable HPD designs and
implementations requiring justification due for their role in carrying out category B or C safety
functions. This document describes the activities to develop HPDs, organized in the framework
of a dedicated life-cycle. It also describes activities and guidelines to be used in addition to the
requirements of IEC 61226 for system classification and IEC 61513 for system integration and
validation when HPDs are included.
IEC 62566-2:2020 © IEC 2020 – 11 –
2 Normative references
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.
IEC 60880:2006, Nuclear power plants – Instrumentation and control systems important to
safety – Software aspects for computer-based systems performing category A functions
IEC 60987, Nuclear power plants – Instrumentation and control important to safety – Hardware
design requirements for computer-based systems
IEC 61226, Nuclear power plants – Instrumentation and control important to safety –
Classification of instrumentation and control functions
IEC 61513:2011, Nuclear power plants – Instrumentation and control important to safety –
General requirements for systems
IEC 62138:2018, Nuclear power plants – Instrumentation and control systems important to
safety – Software aspects for computer-based systems performing category B or C functions
IEC 62340, Nuclear power plants – Instrumentation and control systems important to safety –
Requirements for coping with common cause failure (CCF)
IEC 62566:2012, Nuclear power plants – Instrumentation and control important to safety –
Development of HDL-programmed integrated circuits for systems performing category A
functions
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the followi
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...