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IEC/IEEE 60980-344
Edition 1.0 2020-10
INTERNATIONAL
STANDARD
Nuclear facilities – Equipment important to safety – Seismic qualification
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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 .
...