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SIST EN 61226:2010

(Main)

Nuclear power plants - Instrumentation and control important to safety - Classification of instrumentation and control functions (IEC 61226:2009)

Nuclear power plants - Instrumentation and control important to safety - Classification of instrumentation and control functions (IEC 61226:2009)

This International Standard establishes a method of classification of the information and command functions for nuclear power plants, and the I&C systems and equipment that provide those functions, into categories that designate the importance to safety of the function. The resulting classification then determines relevant design criteria. The design criteria are the measures of quality by which the adequacy of each function in relation to its importance to plant safety is ensured. In this standard, the criteria are those of functionality, reliability, performance, environmental durability (including seismic) and quality assurance (QA). This standard is applicable to all the information and command functions and the instrumentation and control (I&C) systems and equipment that provide those functions. The functions, systems and equipment under consideration provide automated protection, closed or open loop control and information to the operating staff. They keep the NPP conditions inside the safe operating envelope and provide automatic actions, or enable manual actions, that prevent or mitigate accidents, or that prevent or minimize radioactive releases to the site or wider environment. The I&C functions that fulfil these roles safeguard the health and safety of the NPP operators and the public.

Kernkraftwerke - Leittechnische Systeme mit sicherheitstechnischer Bedeutung - Kategorisierung leittechnischer Funktionen (IEC 61226:2009)

Centrales nucléaires de puissance - Instrumentation et contrôle-commande importants pour la sûreté - Classification des fonctions d'instrumentation et de contrôle-commande (CEI 61226:2009)

La CEI 61226:2009 établit une méthode de classement des fonctions d'information et de commande des centrales nucléaires de puissance et des systèmes d'instrumentation et de contrôle-commande (I&C) et matériels qui assurent ces fonctions en catégories indiquant l'importance pour la sûreté de la fonction. Le classement qui en résulte permet alors de déterminer les critères de conception appropriés. Est applicable à toutes les fonctions d'information et de commande, à tous les systèmes d'I&C et les matériels supports de ces fonctions. Les modifications techniques majeures par rapport à l'édition précédente sont les suivantes:  - introduction d'une définition pour 'état contrôlé';  - clarification des limites des catégories;  - clarification des exigences portant sur les matériels utilisés hors dimensionnement.

Jedrske elektrarne - Merilna in nadzorna oprema za zagotavljanje varnosti - Klasifikacija funkcij merilne in nadzorne opreme (IEC 61226:2009)

Ta mednarodni standard vzpostavlja metodo klasifikacije merilnih in nadzornih funkcij za jedrske elektrarne, in merilnih in nadzornih sistemov in opreme za zagotavljanje te funkcije, v kategorije, ki funkciji pripisujejo pomembnost za zagotavljanje varnosti. Posledična klasifikacija nato določa ustrezna merila za načrtovanje. Merila za načrtovanje so ukrepi kakovosti, s katerimi se zagotovi ustreznost vsake funkcije glede na njeno pomembnost za zagotavljanje varnosti elektrarne. V tem standardu so merila funkcionalnosti, zanesljivosti, učinkovitosti, okoljske trajnosti (vključno s potresno) in zagotavljanja kakovosti (QA). Ta standard se uporablja za vse informacijske in nadzorne funkcije ter merilne in nadzorne sisteme in opremo za zagotavljanje te funkcije. Obravnavane funkcije, sistemi in oprema zagotavljajo avtomatsko zaščito, nadzor z zaprto ali odprto zanko ter obveščanje operativnega osebja. Stanje v jedrski elektrarni ohranjajo znotraj varnega operativnega ovoja in zagotavljajo avtomatske ukrepe ali omogočijo ročne ukrepe, ki preprečijo ali ublažijo nesreče ali ki preprečijo ali minimizirajo radioaktivne izpuste na lokaciji ali v širše okolje. Funkcije merilne in nadzorne opreme, ki izpolnjujejo te naloge, varujejo zdravje in varnost operaterjev jedrskih elektrarn in javnosti.

General Information

Status
Withdrawn
Publication Date
22-Jul-2010
Withdrawal Date
29-Jul-2024
ICS
27.120.20 - Nuclear power plants. Safety
Technical Committee
I09 - Imaginarni 09
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
30-Jul-2024
Due Date
22-Aug-2024
Completion Date
30-Jul-2024
Ref Project
EN 61226:2010 - Nuclear power plants - Instrumentation and control important to safety - Classification of instrumentation and control functions

Relations

Replaced By
SIST EN IEC 61226:2021 - Nuclear power plants - Instrumentation, control and electrical power systems important to safety - Categorization of functions and classification of systems (IEC 61226:2020)
Effective Date
20-Jul-2021
Revised
SIST EN IEC 61226:2021 - Nuclear power plants - Instrumentation, control and electrical power systems important to safety - Categorization of functions and classification of systems (IEC 61226:2020)
Effective Date
22-Dec-2020

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SLOVENSKI STANDARD
01-september-2010
Jedrske elektrarne - Merilna in nadzorna oprema za zagotavljanje varnosti -
Klasifikacija funkcij merilne in nadzorne opreme (IEC 61226:2009)
Nuclear power plants - Instrumentation and control important to safety - Classification of
instrumentation and control functions (IEC 61226:2009)
Kernkraftwerke - Leittechnische Systeme mit sicherheitstechnischer Bedeutung -
Kategorisierung leittechnischer Funktionen (IEC 61226:2009)
Centrales nucléaires de puissance - Instrumentation et contrôle-commande importants
pour la sûreté - Classification des fonctions d'instrumentation et de contrôle-commande
(CEI 61226:2009)
Ta slovenski standard je istoveten z: EN 61226:2010
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 61226
NORME EUROPÉENNE
March 2010
EUROPÄISCHE NORM
ICS 27.120.20
English version
Nuclear power plants -
Instrumentation and control important to safety -
Classification of instrumentation and control functions
(IEC 61226:2009)
Centrales nucléaires de puissance -  Kernkraftwerke -
Instrumentation et contrôle-commande Leittechnische Systeme
importants pour la sûreté - mit sicherheitstechnischer Bedeutung -
Classification des fonctions Kategorisierung leittechnischer
d'instrumentation Funktionen
et de contrôle-commande (IEC 61226:2009)
(CEI 61226:2009)
This European Standard was approved by CENELEC on 2010-03-01. 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 Central Secretariat 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 Central Secretariat 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, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: Avenue Marnix 17, B - 1000 Brussels

© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61226:2010 E
Foreword
The text of the International Standard IEC 61226:2009, prepared by SC 45A, Instrumentation and control
of nuclear facilities, of IEC TC 45, Nuclear instrumentation, was submitted to the CENELEC formal vote
for acceptance as a European Standard and was approved by CENELEC as EN 61226 on 2010-03-01.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The following dates are proposed:
– latest date by which the EN has to be implemented

at national level by publication of an identical

national standard or by endorsement
(dop) 2011-03-01
– latest date by which the national standards conflicting

with the EN have to be withdrawn
(dow) 2013-03-01
Annex ZA has been added by CENELEC.
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 measures in the subject-matter covered
by this European Standard.
__________
– 3 – EN 61226:2010
Endorsement notice
The text of the International Standard IEC 61226:2009 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 61508-1 NOTE  Harmonized as EN 61508-1.
IEC 61508-2 NOTE  Harmonized as EN 61508-2.
IEC 61508-3 NOTE  Harmonized as EN 61508-3.
IEC 61508-4 NOTE  Harmonized as EN 61508-4.
__________
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application 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  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
IEC 60671 2007 Nuclear power plants - Instrumentation and -
-
control systems important to safety - Surveillance
testing
IEC 60709 - Nuclear power plants - Instrumentation and -
-
control systems important to safety - Separation
IEC 60780 - Nuclear power plants - Electrical equipment of the -
-
safety system - Qualification
IEC 60812 - Analysis techniques for system reliability - EN 60812 -
Procedure for failure mode and effects analysis
(FMEA)
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 60964 - Nuclear power plants - Control rooms - Design EN 60964 -
IEC 60965 - Nuclear power plants - Control rooms - -
-
Supplementary control points for reactor shutdown
without access to the main control room
IEC 60980 - Recommended practices for seismic qualification - -
of electrical equipment of the safety system for
nuclear generating stations
IEC 60987 - Nuclear power plants - Instrumentation and EN 60987 -
control important to safety - Hardware design
requirements for computer-based systems
IEC 61000-4 Series Electromagnetic compatibility (EMC) - EN 61000-4 Series
Part 4: Testing and measurement techniques
IEC 61000-6-2 - Electromagnetic compatibility (EMC) - EN 61000-6-2 -
Part 6-2: Generic standards - Immunity for
industrial environments
IEC 61513 2001 Nuclear power plants - Instrumentation and - -
control for systems important to safety -
General requirements for systems

– 5 – EN 61226:2010
Publication Year Title EN/HD Year
IEC 61771 - Nuclear power plants - Main control-room - - -
Verification and validation of design
IEC 61772 - Nuclear power plants - Control rooms - Application - -
of visual display units (VDUs)
IEC 61839 - Nuclear power plants - Design of control rooms - - -
Functional analysis and assignment
IEC 62138 - Nuclear power plants - Instrumentation and EN 62138 -
control important for safety - Software aspects for
computer-based systems performing category B
or C functions
IAEA NS-R-1 2000 Safety of nuclear power plants: Design - -
IAEA GS-R-3 2006 The management system for facilities and - -
activities : safety requirements
IAEA NS-G-1.3 2002 Instrumentation and control systems important to - -
safety in nuclear power plants

IEC 61226 ®
Edition 3.0 2009-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Nuclear power plants – Instrumentation and control important to safety –
Classification of instrumentation and control functions

Centrales nucléaires de puissance – Instrumentation et contrôle-commande
importants pour la sûreté – Classement des fonctions d’instrumentation et de
contrôle-commande
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
V
CODE PRIX
ICS 27.120.20 ISBN 2-8318-1052-1
– 2 – 61226 © IEC:2009
CONTENTS
FOREWORD.3
INTRODUCTION.5
1 Scope.8
2 Normative references .8
3 Terms and definitions .9
4 Abbreviations .13
5 Classification scheme.13
5.1 General .13
5.2 Background .14
5.3 Description of categories.14
5.3.1 General .14
5.3.2 Category A .15
5.3.3 Category B .15
5.3.4 Category C .15
5.4 Assignment criteria.16
5.4.1 General .16
5.4.2 Category A .16
5.4.3 Category B .16
5.4.4 Category C .17
6 Classification procedure .17
6.1 General .17
6.2 Identification of design basis .18
6.3 Identification and classification of functions.18
7 Assignment of technical requirements to categories .21
7.1 General requirements.21
7.2 Requirements related to functions .21
7.2.1 Basic requirements.21
7.2.2 Specific requirements .22
7.3 Requirements related to I&C systems.22
7.3.1 Basic requirements.22
7.3.2 Specific requirements .23
7.4 Requirements related to equipment .25
7.4.1 Basic requirements.25
7.4.2 Specific requirements .25
7.5 Requirements related to quality aspects .26
7.5.1 Basic requirements.26
7.5.2 Specific requirements .26
Annex A (informative) Examples of categories .30
Bibliography.32

Figure 1 – Method of classification.20

Table 1 – Tabular correlation between categories and other IEC standards .29

61226 © IEC:2009 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NUCLEAR POWER PLANTS –
INSTRUMENTATION AND CONTROL IMPORTANT TO SAFETY –
CLASSIFICATION OF INSTRUMENTATION AND CONTROL 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 re
...

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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.

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SIST
SIST EN IEC/IEEE 60980-344:2021(Main)
Nuclear facilities - Equipment important to safety - Seismic qualification (IEC/IEEE 60980-344:2020)
EN IEC/IEEE 60980-344:2021

This International Standard describes methods for establishing seismic qualification procedures
that will yield quantitative data to demonstrate that the equipment can meet its performance
requirements. This document is applicable to electrical, mechanical, instrumentation and control
equipment/components that are used in nuclear facilities. This document provides methods and
documentation requirements for seismic qualification of equipment to verify the equipment’s
ability to perform its specified performance requirements during and/or after specified seismic
demands. This document does not specify seismic demand or performance requirements. Other
aspects, relating to quality assurance, selection of equipment, and design and modification of
systems, are not part of this document. As seismic qualification is only a part of equipment
qualification, this document is used in conjunction with IEC/IEEE 60780-323.
The seismic qualification demonstrates equipment’s ability to perform its safety function(s)
during and/or after the time it is subjected to the forces resulting from at least one safe shutdown
earthquake (SSE/S2). This ability is demonstrated by taking into account, prior to the SSE/S2,
the ageing of equipment and the postulated occurrences of a given number of lower intensity
operating basis earthquake (OBE/S1). Ageing phenomena to be considered, if specified in the
design specification, are those which could increase the vulnerability of equipment to vibrations
caused by an SSE/S2.

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SIST EN IEC 62566-2:2021(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 (IEC 62566-2:2020)
EN IEC 62566-2:2020

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.

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SIST EN IEC 62003:2020(Main)
Nuclear power plants - Instrumentation, control and electrical power systems - Requirements for electromagnetic compatibility testing (IEC 62003:2020)
EN IEC 62003:2020

IEC 62003:2020 establishes requirements for electromagnetic compatibility testing of instrumentation, control, and electrical equipment supplied for use in systems important to safety at nuclear power plants and other nuclear facilities. The document lists the applicable IEC standards (principally the IEC 61000 series) which define the general test methods, and provides the necessary application-specific parameters and criteria to ensure that nuclear safety requirements are met.
This second edition cancels and replaces the first edition published in 2009. This edition includes the following significant technical changes with respect to the previous edition:
a) title modified.
b) expand the scope to encompass Electromagnetic Magnetic Compatibility (EMC) considerations for electrical equipment.
c) provide guidance for addressing the use of wireless technology.
d) enhance the description of the electromagnetic environment to provide clarification when selecting custom test levels or for test exemptions.
e) include example information to be contained within an EMC test plan.
f) provide guidance for characterization of the electromagnetic environment at the point of installation within a nuclear facility.

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