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

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.

Kerntechnische Anlagen - Gerät mit sicherheitstechnischer Bedeutung - Seismische Qualifizierung (IEC/IEEE 60980-344:2020)

Installations nucléaires - Equipements importants pour la sûreté - Qualification sismique (IEC/IEEE 60980-344:2020)

Jedrski objekti - Oprema, pomembna za varnost - Seizmična (potresna) kvalifikacija (IEC/IEEE 60980-344:2020)

General Information

Status
Published
Public Enquiry End Date
28-Feb-2021
Publication Date
03-May-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
28-Apr-2021
Due Date
03-Jul-2021
Completion Date
04-May-2021

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SLOVENSKI STANDARD
SIST EN IEC/IEEE 60980-344:2021
01-junij-2021
Jedrski objekti - Oprema, pomembna za varnost - Seizmična (potresna)
kvalifikacija (IEC/IEEE 60980-344:2020)

Nuclear facilities - Equipment important to safety - Seismic qualification (IEC/IEEE 60980

-344:2020)
Kerntechnische Anlagen - Gerät mit sicherheitstechnischer Bedeutung - Seismische
Qualifizierung (IEC/IEEE 60980-344:2020)

Installations nucléaires - Equipements importants pour la sûreté - Qualification sismique

(IEC/IEEE 60980-344:2020)
Ta slovenski standard je istoveten z: EN IEC/IEEE 60980-344:2021
ICS:
27.120.20 Jedrske elektrarne. Varnost Nuclear power plants. Safety
91.120.25 Zaščita pred potresi in Seismic and vibration
vibracijami protection
SIST EN IEC/IEEE 60980-344:2021 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC/IEEE 60980-344:2021
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SIST EN IEC/IEEE 60980-344:2021
EUROPEAN STANDARD EN IEC/IEEE 60980-344
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2021
ICS 27.120.10; 27.120.20
English Version
Nuclear facilities - Equipment important to safety - Seismic
qualification
(IEC/IEEE 60980-344:2020)

Installations nucléaires - Equipements importants pour la Kerntechnische Anlagen - Gerät mit sicherheitstechnischer

sûreté - Qualification sismique Bedeutung - Seismische Qualifizierung
(IEC/IEEE 60980-344:2020) (IEC/IEEE 60980-344:2020)

This European Standard was approved by CENELEC on 2021-04-19. 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

© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC/IEEE 60980-344:2021 E
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SIST EN IEC/IEEE 60980-344:2021
EN IEC/IEEE 60980-344:2021 (E)
European foreword

The text of document 45A/1323/FDIS, future edition 1 of IEC/IEEE 60980-344, prepared by SC 45A

"Instrumentation, control and electrical power systems of nuclear facilities" of IEC/TC 45 "Nuclear

instrumentation" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as

EN IEC/IEEE 60980-344:2021.
The following dates are fixed:

latest date by which the document has to be implemented at national (dop) 2022-01-19

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2024-04-19

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/IEEE 60980-344:2020 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 60068-3-3 NOTE Harmonized as EN IEC 60068-3-3
IEC 60068-2-81 NOTE Harmonized as EN 60068-2-81
IEC 60068-2-47 NOTE Harmonized as EN 60068-2-47
IEC 60068-2-57 NOTE Harmonized as EN 60068-2-57
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SIST EN IEC/IEEE 60980-344:2021
EN IEC/IEEE 60980-344:2021 (E)
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
- Environmental testing - Part 2-6: Tests - -
IEC 60068-2-6 EN 60068-2-6
Test Fc: Vibration (sinusoidal)
- Nuclear facilities - Electrical equipment -
IEC/IEEE 60780- EN 60780-323
important to safety - Qualification
323
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SIST EN IEC/IEEE 60980-344:2021
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SIST EN IEC/IEEE 60980-344:2021
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

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 7 ----------------------
SIST EN IEC/IEEE 60980-344:2021
– 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

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SIST EN IEC/IEEE 60980-344:2021
IEC/IEEE 60980-344:2020 – 3 –
 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 ............................................................. 54

12.2.5 Qualification .................................................................................................. 54

12.3 Extrapolation for similar equipment ....................................................................... 54

12.3.1 General ......................................................................................................... 54

12.3.2 Test method .................................................................................................. 54

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SIST EN IEC/IEEE 60980-344:2021
– 4 – IEC/IEEE 60980-344:2020
 IEC/IEEE 2020

12.3.3 Analysis ......................................................................................................... 55

12.4 Shock testing ........................................................................................................ 55

12.5 Extrapolation for multi-cabinet assemblies ............................................................ 55

12.6 Other test/analysis ................................................................................................ 55

13 Documentation .............................................................................................................. 56

13.1 General ................................................................................................................. 56

13.2 Seismic qualification report ................................................................................... 56

13.2.1 General ......................................................................................................... 56

13.2.2 Analysis ......................................................................................................... 56

13.2.3 Testing .......................................................................................................... 56

13.2.4 Combined analysis and testing or similarity ................................................... 57

Annex A (normative) Experience-based seismic qualification ............................................... 58

A.1 General ................................................................................................................. 58

A.2 Earthquake experience data ................................................................................. 58

A.2.1 General ......................................................................................................... 58

A.2.2 Characterization of the earthquake experience motions ................................. 58

A.2.3 Earthquake experience spectrum (EES)......................................................... 59

A.2.4 Characterization of reference equipment class .............................................. 59

A.2.5 Qualification of candidate equipment ............................................................. 61

A.3 Test experience data ............................................................................................ 62

A.3.1 General ......................................................................................................... 62

A.3.2 Characterization of test experience input motions .......................................... 62

A.3.3 Test experience spectra (TES) ...................................................................... 62

A.3.4 Characterization of reference equipment class .............................................. 63

A.3.5 Qualification of candidate equipment ............................................................. 64

A.4 Special considerations .......................................................................................... 64

A.4.1 Inherently rugged equipment ......................................................................... 64

A.4.2 Limitations ..................................................................................................... 65

A.5 Experience-based documentation ......................................................................... 65

A.5.1 General ......................................................................................................... 65

A.5.2 Reference data .............................................................................................. 66

A.5.3 Candidate equipment qualification ................................................................. 66

Annex B (informative) Measurement of zero period acceleration .......................................... 67

Annex C (informative) Frequency content and stationarity .................................................... 68

Annex D (informative) Fragility testing ................................................................................. 69

D.1 General ................................................................................................................. 69

D.2 Excitation motion .................................................................................................. 69

D.3 Application of results............................................................................................. 70

D.4 Other considerations ............................................................................................. 70

Annex E (informative) Test duration and number of cycles ................................................... 72

Annex F (informative) Statistically independent motions ....................................................... 76

Annex G (informative) Seismic qualification illustrative flowcharts ........................................ 77

G.1 General ................................................................................................................. 77

G.2 Establishment of seismic conditions and acceptance criteria ................................. 77

G.3 Qualification by testing .......................................................................................... 77

G.4 Qualification by analysis ....................................................................................... 77

G.5 Qualification by combination of analysis and testing .............................................. 77

Bibliography .......................................................................................................................... 82

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SIST EN IEC/IEEE 60980-344:2021
IEC/IEEE 60980-344:2020 – 5 –
 IEC/IEEE 2020

Figure 1 – Sine beat ............................................................................................................. 39

Figure 2 – Decaying sine ...................................................................................................... 39

Figure 3 – Random spectrum with superimposed sine beats ................................................. 43

Figure 4 – Resonant amplification versus cycles per beat ..................................................... 44

Figure E.1 – Fractional cycles to obtain one equipment maximum peak cycle ....................... 73

Figure E.2 – Equivalent peak-stress cycles induced by stationary random motion ................. 74

Figure E.3 – Equivalent peak-stress cycles induced by stationary random motion to 20 Hz ... 74

Figure G.1 – Seismic qualification flowchart .......................................................................... 78

Figure G.2 – Seismic qualification test flowchart ................................................................... 79

Figure G.3 – Seismic qualification analysis flowchart ............................................................ 80

Figure G.4 – Seismic qualification analysis and test flowchart ............................................... 81

Table A.1 – EES reduction factor based on number of independent items ............................. 60

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SIST EN IEC/IEEE 60980-344:2021
– 6 – IEC/IEEE 60980-344:2020
 IEC/IEEE 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NUCLEAR FACILITIES –
EQUIPMENT IMPORTANT TO SAFETY –
SEISMIC QUALIFICATION
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

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IEEE Standards documents are developed within IEEE Societies and Standards Coordinating Committees of the

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Use of IEEE Standards documents is wholly voluntary. IEEE documents are made available for use subject to

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IEC collaborates closely with IEEE in accordance with conditions determined by agreement between the two

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6) All users should ensure that they have the latest edition of this publication.

7) No liability shall att
...

SLOVENSKI STANDARD
oSIST prEN IEC/IEEE 60980-344:2021
01-februar-2021
Jedrski objekti - Oprema, pomembna za varnost - Seizmična (potresna)
kvalifikacija (IEC/IEEE 60980-344:2020)

Nuclear facilities - Equipment important to safety - Seismic qualification (IEC/IEEE 60980

-344:2020)
Kerntechnische Anlagen - Gerät mit sicherheitstechnischer Bedeutung - Seismische
Qualifizierung (IEC/IEEE 60980-344:2020)

Installations nucléaires - Equipements importants pour la sûreté - Qualification sismique

(IEC/IEEE 60980-344:2020)
Ta slovenski standard je istoveten z: prEN IEC/IEEE 60980-344
ICS:
27.120.10 Reaktorska tehnika Reactor engineering
27.120.20 Jedrske elektrarne. Varnost Nuclear power plants. Safety
oSIST prEN IEC/IEEE 60980-344:2021 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN IEC/IEEE 60980-344:2021
---------------------- Page: 2 ----------------------
oSIST prEN IEC/IEEE 60980-344:2021
EUROPEAN STANDARD DRAFT
prEN IEC/IEEE 60980-344
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2020
ICS 27.120.10; 27.120.20
English Version
Nuclear facilities - Equipment important to safety - Seismic
qualification
(IEC/IEEE 60980-344:2020)

Installations nucléaires - Equipements importants pour la Kerntechnische Anlagen - Gerät mit sicherheitstechnischer

sûreté - Qualification sismique Bedeutung - Seismische Qualifizierung
(IEC/IEEE 60980-344:2020) (IEC/IEEE 60980-344:2020)
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2021-03-12.
The text of this draft consists of the text of IEC/IEEE 60980-344:2020.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CENELEC 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.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to

provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and

shall not be referred to as a European Standard.
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.

Project: 72884 Ref. No. prEN IEC/IEEE 60980-344 E
---------------------- Page: 3 ----------------------
oSIST prEN IEC/IEEE 60980-344:2021
prEN IEC/IEEE 60980-344:2020 (E)
European foreword

This document (prEN IEC/IEEE 60980-344:2020) consists of the text of IEC/IEEE 60980-344:2020

prepared IEC/SC 45A "Instrumentation, control and electrical power systems of nuclear facilities", of

IEC/TC 45 "Nuclear instrumentation".
This document is currently submitted to the Enquiry
The following dates are proposed:
• latest date by which the existence of this document (doa) dor + 6 months
has to be announced at national level
• latest date by which this document has to be (dop) dor + 12 months
implemented at national level by publication of an
identical national standard or by endorsement
• latest date by which the national standards (dow) dor + 36 months
conflicting with this document have to be withdrawn (to be confirmed or
modified when voting)

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.

---------------------- Page: 4 ----------------------
oSIST prEN IEC/IEEE 60980-344:2021
prEN IEC/IEEE 60980-344:2020 (E)
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 60068-2-6 - Environmental testing - Part 2-6: Tests - EN 60068-2-6 -
Test Fc: Vibration (sinusoidal)
IEC/IEEE 60780-323 - Nuclear facilities – Electrical equipment EN 60780-323 -
important to safety – Qualification
IEEE Std 382 - IEEE Standard for Qualification of Safety- - -
Related Actuators for Nuclear Power
Generating Stations
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oSIST prEN IEC/IEEE 60980-344:2021
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oSIST prEN IEC/IEEE 60980-344:2021
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

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 7 ----------------------
oSIST prEN IEC/IEEE 60980-344:2021
– 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

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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 ............................................................. 54

12.2.5 Qualification .................................................................................................. 54

12.3 Extrapolation for similar equipment ....................................................................... 54

12.3.1 General ......................................................................................................... 54

12.3.2 Test method .................................................................................................. 54

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12.3.3 Analysis ......................................................................................................... 55

12.4 Shock testing ........................................................................................................ 55

12.5 Extrapolation for multi-cabinet assemblies ............................................................ 55

12.6 Other test/analysis ................................................................................................ 55

13 Documentation .............................................................................................................. 56

13.1 General ................................................................................................................. 56

13.2 Seismic qualification report ................................................................................... 56

13.2.1 General ......................................................................................................... 56

13.2.2 Analysis ......................................................................................................... 56

13.2.3 Testing .......................................................................................................... 56

13.2.4 Combined analysis and testing or similarity ................................................... 57

Annex A (normative) Experience-based seismic qualification ............................................... 58

A.1 General ................................................................................................................. 58

A.2 Earthquake experience data ................................................................................. 58

A.2.1 General ......................................................................................................... 58

A.2.2 Characterization of the earthquake experience motions ................................. 58

A.2.3 Earthquake experience spectrum (EES)......................................................... 59

A.2.4 Characterization of reference equipment class .............................................. 59

A.2.5 Qualification of candidate equipment ............................................................. 61

A.3 Test experience data ............................................................................................ 62

A.3.1 General ......................................................................................................... 62

A.3.2 Characterization of test experience input motions .......................................... 62

A.3.3 Test experience spectra (TES) ...................................................................... 62

A.3.4 Characterization of reference equipment class .............................................. 63

A.3.5 Qualification of candidate equipment ............................................................. 64

A.4 Special considerations .......................................................................................... 64

A.4.1 Inherently rugged equipment ......................................................................... 64

A.4.2 Limitations ..................................................................................................... 65

A.5 Experience-based documentation ......................................................................... 65

A.5.1 General ......................................................................................................... 65

A.5.2 Reference data .............................................................................................. 66

A.5.3 Candidate equipment qualification ................................................................. 66

Annex B (informative) Measurement of zero period acceleration .......................................... 67

Annex C (informative) Frequency content and stationarity .................................................... 68

Annex D (informative) Fragility testing ................................................................................. 69

D.1 General ................................................................................................................. 69

D.2 Excitation motion .................................................................................................. 69

D.3 Application of results............................................................................................. 70

D.4 Other considerations ............................................................................................. 70

Annex E (informative) Test duration and number of cycles ................................................... 72

Annex F (informative) Statistically independent motions ....................................................... 76

Annex G (informative) Seismic qualification illustrative flowcharts ........................................ 77

G.1 General ................................................................................................................. 77

G.2 Establishment of seismic conditions and acceptance criteria ................................. 77

G.3 Qualification by testing .......................................................................................... 77

G.4 Qualification by analysis ....................................................................................... 77

G.5 Qualification by combination of analysis and testing .............................................. 77

Bibliography .......................................................................................................................... 82

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Figure 1 – Sine beat ............................................................................................................. 39

Figure 2 – Decaying sine ...................................................................................................... 39

Figure 3 – Random spectrum with superimposed sine beats ................................................. 43

Figure 4 – Resonant amplification versus cycles per beat ..................................................... 44

Figure E.1 – Fractional cycles to obtain one equipment maximum peak cycle ....................... 73

Figure E.2 – Equivalent peak-stress cycles induced by stationary random motion ................. 74

Figure E.3 – Equivalent peak-stress cycles induced by stationary random motion to 20 Hz ... 74

Figure G.1 – Seismic qualification flowchart .......................................................................... 78

Figure G.2 – Seismic qualification test flowchart ................................................................... 79

Figure G.3 – Seismic qualification analysis flowchart ............................................................ 80

Figure G.4 – Seismic qualification analysis and test flowchart ............................................... 81

Table A.1 – EES reduction factor based on number of independent items ............................. 60

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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NUCLEAR FACILITIES –
EQUIPMENT IMPORTANT TO SAFETY –
SEISMIC QUALIFICATION
FOREWORD

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