IEC/IEEE 60980-344:2020
(Main)Nuclear facilities - Equipment important to safety - Seismic qualification
Nuclear facilities - Equipment important to safety - Seismic qualification
IEC/IEEE 60980-344:2020 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.
Installations nucléaires - Équipements importants pour la sûreté - Qualification sismique
IEC/IEEE 60980-344:2020 décrit les méthodes d'établissement des procédures de qualification sismique permettant d'obtenir des données quantitatives visant à démontrer que l'équipement peut satisfaire à ses exigences de performance. Le présent document s'applique aux équipements/composants électriques, mécaniques, d'instrumentation et de contrôle commande utilisés dans les installations nucléaires. Il donne les méthodes et exigences de documentation relatives à la qualification sismique des équipements afin de vérifier l'aptitude de ces derniers à satisfaire à leurs exigences de performances spécifiées pendant et/ou après les sollicitations sismiques spécifiées. Le présent document ne spécifie aucune sollicitation sismique ni exigence de performances. Les autres aspects, relatifs à l'assurance qualité, au choix des équipements et à la conception et la modification des systèmes ne relèvent pas du présent document. La qualification sismique ne représentant qu'une partie de la qualification des équipements, le présent document est utilisé conjointement avec l'IEC/IEEE 60780-323.
La qualification sismique démontre l'aptitude de l'équipement à exécuter sa ou ses fonctions de sûreté pendant et/ou après avoir été soumis aux efforts d'au moins un séisme majoré de sécurité (SSE/S2). Cette aptitude est démontrée en tenant compte, avant le séisme de référence en exploitation SSE/S2, du vieillissement de l'équipement et des éventuelles occurrences d'un certain nombre de séismes de référence en exploitation de moindre intensité (OBE/S1). Les phénomènes de vieillissement à prendre en considération, s'ils sont indiqués dans la spécification de conception, sont ceux qui peuvent augmenter la vulnérabilité des équipements aux vibrations provoquées par un SSE/S2.
Cette nouvelle édition annule et remplace la première édition de l'IEC 60980, parue en 1989, et constitue une révision technique. Elle remplace également la norme IEEE 344TM-2013.
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IEC/IEEE 60980-344 ®
Edition 1.0 2020-10
INTERNATIONAL
STANDARD
Nuclear facilities – Equipment important to safety – Seismic qualification
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing being
secured. Requests for permission to reproduce should be addressed to either IEC at the address below or IEC’s
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International Standards for all electrical, electronic and related technologies.
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IEC/IEEE 60980-344 ®
Edition 1.0 2020-10
INTERNATIONAL
STANDARD
Nuclear facilities – Equipment important to safety – Seismic qualification
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 27.120.10; 27.120.20 ISBN 978-2-8322-8482-7
– 2 – IEC/IEEE 60980-344:2020
IEC/IEEE 2020
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 11
2 Normative references . 11
3 Terms and definitions . 11
4 Abbreviated terms . 19
5 General discussion of earthquake environment and equipment response. 20
5.1 General . 20
5.2 Earthquake environment . 20
5.3 Equipment on foundations . 20
5.4 Equipment on structures . 20
5.5 Interfaces and adverse interactions. 21
5.6 Simulating vibration induced by an earthquake . 21
5.6.1 General . 21
5.6.2 Response spectrum . 21
5.6.3 Time history . 22
5.6.4 PSD function . 22
5.7 Damping . 22
5.7.1 General . 22
5.7.2 Measurement of damping . 23
5.8 Application of damping . 23
5.8.1 General . 23
5.8.2 Application of damping in testing . 23
5.8.3 Application of damping in analysis . 24
6 Seismic qualification requirements . 24
6.1 General . 24
6.2 Specification of equipment to be qualified . 25
6.3 Specification of ageing condition . 25
6.4 Specification of seismic requirements . 25
6.5 Specification of acceptance criteria . 25
7 Seismic qualification approach . 26
7.1 Safety function . 26
7.2 Seismic qualification methods . 26
8 Ageing . 27
8.1 General . 27
8.2 Thermal ageing . 28
8.3 Radiation ageing . 28
8.4 Material degradation and corrosion . 28
8.5 Mechanical or electrical cycle ageing . 28
8.6 Vibration ageing . 28
8.6.1 General . 28
8.6.2 Ageing from non-seismic vibration conditions . 29
8.6.3 Hydrodynamic loads . 29
8.6.4 Seismic ageing (OBE/S1) . 29
9 Testing . 29
9.1 General . 29
IEC/IEEE 2020
9.1.1 Test programme . 29
9.1.2 Mounting . 31
9.1.3 Monitoring . 31
9.1.4 Loading . 31
9.1.5 Refurbishment . 32
9.1.6 Exploratory tests . 32
9.1.7 Seismic ageing (OBE/S1) . 34
9.2 Proof and generic testing . 34
9.3 Fragility testing . 35
9.4 Component testing . 35
9.5 Assembly testing . 35
9.5.1 General . 35
9.6 Test methods . 36
9.6.1 General . 36
9.6.2 Single-frequency test . 37
9.6.3 Multiple-frequency tests . 40
9.6.4 Other tests . 45
9.6.5 Test duration and low-cycle fatigue potential . 45
9.6.6 Multi-axis tests . 45
9.6.7 Line-mounted equipment . 47
9.6.8 Additional tests . 48
9.7 Test documentation . 48
10 Qualification by similarity . 48
10.1 General . 48
10.2 Excitation . 48
10.3 Physical systems . 48
10.4 Safety function . 49
11 Analysis . 49
11.1 General . 49
11.2 Seismic analysis methods . 50
11.2.1 General . 50
11.2.2 Static analysis . 51
11.2.3 Static coefficient analysis . 51
11.2.4 Dynamic analysis . 51
11.3 Nonlinear equipment response . 52
11.4 Other dynamic loads . 52
11.5 Seismic analysis results . 52
11.6 Documentation of analysis . 53
12 Combined analysis and testing . 53
12.1 General . 53
12.2 Modal testing . 53
12.2.1 General . 53
12.2.2 Normal-mode method . 53
12.2.3 Transfer-function method . 54
12.2.4 Analytical methods utilizing test data .
...
IEC/IEEE 60980-344 ®
Edition 1.0 2020-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Nuclear facilities – Equipment important to safety – Seismic qualification
Installations nucléaires – Équipements importants pour la sûreté – Qualification
sismique
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing being
secured. Requests for permission to reproduce should be addressed to either IEC at the address below or IEC’s
member National Committee in the country of the requester or from IEEE.
IEC Central Office Institute of Electrical and Electronics Engineers, Inc.
3, rue de Varembé 3 Park Avenue
CH-1211 Geneva 20 New York, NY 10016-5997
Switzerland United States of America
Tel.: +41 22 919 02 11 stds.ipr@ieee.org
info@iec.ch www.ieee.org
www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform IEC online collection - oc.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always
committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.
and withdrawn publications.
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IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 000 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 18 additional languages.
once a month by email.
Also known as the International Electrotechnical Vocabulary
(IEV) online.
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need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
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IEC/IEEE 60980-344 ®
Edition 1.0 2020-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Nuclear facilities – Equipment important to safety – Seismic qualification
Installations nucléaires – Équipements importants pour la sûreté – Qualification
sismique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.120.10; 27.120.20 ISBN 978-2-8322-1016-8
– 2 – IEC/IEEE 60980-344:2020
IEC/IEEE 2020
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 11
2 Normative references . 11
3 Terms and definitions . 11
4 Abbreviated terms . 19
5 General discussion of earthquake environment and equipment response. 20
5.1 General . 20
5.2 Earthquake environment . 20
5.3 Equipment on foundations . 20
5.4 Equipment on structures . 20
5.5 Interfaces and adverse interactions. 21
5.6 Simulating vibration induced by an earthquake . 21
5.6.1 General . 21
5.6.2 Response spectrum . 21
5.6.3 Time history . 22
5.6.4 PSD function . 22
5.7 Damping . 22
5.7.1 General . 22
5.7.2 Measurement of damping . 23
5.8 Application of damping . 23
5.8.1 General . 23
5.8.2 Application of damping in testing . 23
5.8.3 Application of damping in analysis . 24
6 Seismic qualification requirements . 24
6.1 General . 24
6.2 Specification of equipment to be qualified . 25
6.3 Specification of ageing condition . 25
6.4 Specification of seismic requirements . 25
6.5 Specification of acceptance criteria . 25
7 Seismic qualification approach . 26
7.1 Safety function . 26
7.2 Seismic qualification methods . 26
8 Ageing . 27
8.1 General . 27
8.2 Thermal ageing . 28
8.3 Radiation ageing . 28
8.4 Material degradation and corrosion . 28
8.5 Mechanical or electrical cycle ageing . 28
8.6 Vibration ageing . 28
8.6.1 General . 28
8.6.2 Ageing from non-seismic vibration conditions . 29
8.6.3 Hydrodynamic loads . 29
8.6.4 Seismic ageing (OBE/S1) . 29
9 Testing . 29
9.1 General . 29
IEC/IEEE 2020
9.1.1 Test programme . 29
9.1.2 Mounting . 31
9.1.3 Monitoring . 31
9.1.4 Loading . 31
9.1.5 Refurbishment . 32
9.1.6 Exploratory tests . 32
9.1.7 Seismic ageing (OBE/S1) . 34
9.2 Proof and generic testing . 34
9.3 Fragility testing . 35
9.4 Component testing . 35
9.5 Assembly testing . 35
9.5.1 General . 35
9.6 Test methods . 36
9.6.1 General . 36
9.6.2 Single-frequency test . 37
9.6.3 Multiple-frequency tests . 40
9.6.4 Other tests . 45
9.6.5 Test duration and low-cycle fatigue potential . 45
9.6.6 Multi-axis tests . 45
9.6.7 Line-mounted equipment . 47
9.6.8 Additional tests . 48
9.7 Test documentation . 48
10 Qualification by similarity . 48
10.1 General . 48
10.2 Excitation . 48
10.3 Physical systems . 48
10.4 Safety function . 49
11 Analysis . 49
11.1 General . 49
11.2 Seismic analysis methods . 50
11.2.1 General .
...
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