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EN 62808:2016

(Main)

Nuclear power plants - Instrumentation and control systems important to safety - Design and qualification of isolation devices

Nuclear power plants - Instrumentation and control systems important to safety - Design and qualification of isolation devices

IEC 62808:2015 establishes requirements for the design, analysis and qualification of isolation devices used to ensure electrical independence of redundant safety system circuits, or between safety and lower class circuits, as specified in IEC 60709. This standard includes guidance on the determination of the maximum credible fault that is applied to the isolation devices. The maximum credible fault can be used as a basis for the test levels used in testing based on other standards (e.g. IEC TS 61000-6-5 or IEC 62003).

Kernkraftwerke - Leittechnik mit sicherheitstechnischer Bedeutung - Auslegung und Qualifizierung von Isolationseinrichtungen

Centrales nucléaires de puissance - Systèmes d’instrumentation et de contrôle-commande importants pour la sûreté - Conception et qualification des appareils d’isolement

L'IEC 62808:2015 établit des exigences pour la conception, les analyses et la qualification des appareils d'isolement utilisés pour garantir l'indépendance électriques entre les circuits des systèmes de sûreté redondants ou entre les circuits des systèmes de sûreté et des systèmes dont la classe de sûreté est inférieure, comme spécifié dans l'IEC 60709. La présente norme comprend des recommandations portant sur la détermination du défaut maximal prévisible qui est pris en compte pour les appareils d'isolement. Le défaut maximal prévisible peut être utilisé comme une base pour le niveau des essais définis à partir d'autres normes (par exemple l'IEC TS 61000-6-5 ou l'IEC 62003).

Jedrske elektrarne - Instrumenti in nadzorni sistemi za zagotavljanje varnosti - Projektiranje in razvrščanje izolacijskih naprav (IEC 62808:2015)

Ta mednarodni standard določa zahteve glede projektiranja, analize in razvrščanja izolacijskih naprav, ki se uporabljajo za električno ločitev odvečnih krogotokov varnostnega sistema ali med varnostnimi krogotoki in krogotoki nižjega razreda, kot je opredeljeno v standardu IEC 60709. Ta standard vključuje smernice za določevanje največje verodostojne napake, ki se uporablja za izolacijske naprave. Največja verodostojna napaka se lahko uporablja kot osnova za preskusne ravni, ki se uporabljajo pri preskušanju na podlagi drugih standardov (npr. IEC TS 61000-6-5 ali IEC 62003).
Ta standard ne obravnava varnostnih težav ali težav z odpovedmi iz normalnih razlogov (CCF) zaradi medsebojnih funkcionalnih odvisnosti in možnih motenj ali odpovedi iz normalnih razlogov, ki so lahko posledica izmenjave ali skupne rabe signalov med sistemi ali podsistemi. Poleg tega ne obravnava težav zaradi projektiranja ali razvrščanja, povezanih z digitalno ali programirljivo logiko v izolacijskih napravah. Za izolacijske naprave, ki vsebujejo digitalno ali programirljivo logiko, je treba upoštevati dodatne zahteve glede projektiranja in razvrščanja; te zahteve so zunaj področja uporabe tega standarda.

General Information

Status
Published
Publication Date
15-Sep-2016
Withdrawal Date
17-Jul-2019
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
16-Sep-2016
Due Date
28-Jan-2018
Completion Date
16-Sep-2016
Ref Project
SIST EN 62808:2016 - Nuclear power plants - Instrumentation and control systems important to safety - Design and qualification of isolation devices (IEC 62808:2015)

Relations

Amended By
EN 62808:2016/A1:2019 - Nuclear power plants - Instrumentation and control systems important to safety - Design and qualification of isolation devices
Effective Date
20-Mar-2018

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kernkraftwerke - Leittechnik mit sicherheitstechnischer Bedeutung - Auslegung und Qualifizierung von Isolationseinrichtungen (IEC 62808:2015)Centrales nucléaires de puissance - Systèmes d’instrumentation et de contrôle-commande importants pour la sûreté - Conception et qualification des appareils d’isolement (IEC 62808:2015)Nuclear power plants - Instrumentation and control systems important to safety - Design and qualification of isolation devices (IEC 62808:2015)27.120.20Jedrske elektrarne. VarnostNuclear power plants. SafetyICS:Ta slovenski standard je istoveten z:EN 62808:2016SIST EN 62808:2016en01-november-2016SIST EN 62808:2016SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 62808
September 2016 ICS 27.120.20
English Version
Nuclear power plants - Instrumentation and control systems important to safety - Design and qualification of isolation devices (IEC 62808:2015)
Centrales nucléaires de puissance - Systèmes d'instrumentation et de contrôle-commande importants pour la sûreté - Conception et qualification des appareils d'isolement (IEC 62808:2015)
Kernkraftwerke - Leittechnik mit sicherheitstechnischer Bedeutung - Auslegung und Qualifizierung von Isolationseinrichtungen (IEC 62808:2015) This European Standard was approved by CENELEC on 2016-07-18. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17,
B-1000 Brussels © 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 62808:2016 E SIST EN 62808:2016

The following dates are fixed: • latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2017-07-18 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2019-07-18
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC [and/or CEN] 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 measures in the subject-matter covered by this standard. Endorsement notice The text of the International Standard IEC 62808:2015 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 60880 NOTE Harmonized as EN 60880. IEC 61226:2009 NOTE Harmonized as EN 61226:2010 (not modified). 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. IEC 62138 NOTE Harmonized as EN 62138. SIST EN 62808:2016

Normative references to international publications with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. 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 60709 -
Nuclear power plants - Instrumentation
and control systems important to safety - Separation EN 60709 -
IEC/TS 61000-6-5 -
Electromagnetic compatibilty (EMC) -
Part 6-5: Generic standards - Immunity for power station and substation environments - -
IEC 61513 -
Nuclear power plants - Instrumentation
and control important to safety - General requirement for systems EN 61513 -
IEC 62003 -
Nuclear power plants - Instrumentation and control important to safety - Requirements for electromagnetic compatibility testing - -
IEC 62808 Edition 1.0 2015-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Nuclear power plants – Instrumentation and control systems important to safety – Design and qualification of isolation devices
Centrales nucléaires de puissance – Systèmes d’instrumentation et de
contrôle-commande importants pour la sûreté – Conception et qualification
des appareils d’isolement INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE
ICS 27.120.20
ISBN 978-2-8322-2665-0
– 2 – IEC 62808:2015 © IEC 2015 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope . 7 2 Normative references . 7 3 Terms and definitions . 7 4 Symbols and abbreviations . 8 5 General principles for isolation devices . 8 5.1 General . 8 5.2 Isolation characteristics . 9 5.3 Actuation priority . 10 6 Isolation device design requirements . 10 6.1 Requirements on isolation device application . 10 6.1.1 Isolation device power . 10 6.1.2 Maximum credible fault . 10 6.1.3 Energy limiting devices . 11 6.2 Requirements on isolation device design . 11 6.2.1 Basic design requirements . 11 6.2.2 Postulated faults . 12 6.2.3 Physical component arrangement . 12 6.3 Power isolation devices . 13 6.3.1 General . 13 6.3.2 Circuit breaker tripped by fault currents . 13 6.3.3 Circuit breaker tripped by fault signals . 13 6.3.4 Input current limiters . 13 6.3.5 Fuses . 13 7 Qualification test requirements . 13 7.1 General . 13 7.2 Requirements on the test method . 14 7.2.1 Test specification . 14 7.2.2 Testing energy limiting devices . 14 7.2.3 Qualification test environment . 14 7.3 Application specific testing . 15 7.3.1 General . 15 7.3.2 Isolation of safety circuits from lower class circuits . 15 7.3.3 Isolation between redundant safety circuits . 15 7.4 Documentation of test requirements and results . 15 Bibliography . 16
Figure 1 – Application of maximum credible fault . 11 Figure 2 – Application of postulated fault . 12
IEC 62808:2015 © IEC 2015 – 3 – INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
NUCLEAR POWER PLANTS –
INSTRUMENTATION AND CONTROL SYSTEMS IMPORTANT TO SAFETY –
DESIGN AND QUALIFICATION OF ISOLATION DEVICES
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 62808 has been prepared by su
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