BS EN IEC/IEEE 60980-344:2021
$215.11
Nuclear facilities. Equipment important to safety. Seismic qualification
| Published By | Publication Date | Number of Pages |
| BSI | 2021 | 88 |
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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 5 | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications |
| 7 | CONTENTS |
| 11 | FOREWORD |
| 13 | INTRODUCTION |
| 16 | 1 Scope 2 Normative references 3 Terms and definitions |
| 24 | 4 Abbreviated terms |
| 25 | 5 General discussion of earthquake environment and equipment response 5.1 General 5.2 Earthquake environment 5.3 Equipment on foundations 5.4 Equipment on structures |
| 26 | 5.5 Interfaces and adverse interactions 5.6 Simulating vibration induced by an earthquake 5.6.1 General 5.6.2 Response spectrum |
| 27 | 5.6.3 Time history 5.6.4 PSD function 5.7 Damping 5.7.1 General |
| 28 | 5.7.2 Measurement of damping 5.8 Application of damping 5.8.1 General 5.8.2 Application of damping in testing |
| 29 | 5.8.3 Application of damping in analysis 6 Seismic qualification requirements 6.1 General |
| 30 | 6.2 Specification of equipment to be qualified 6.3 Specification of ageing condition 6.4 Specification of seismic requirements 6.5 Specification of acceptance criteria |
| 31 | 7 Seismic qualification approach 7.1 Safety function 7.2 Seismic qualification methods |
| 32 | 8 Ageing 8.1 General |
| 33 | 8.2 Thermal ageing 8.3 Radiation ageing 8.4 Material degradation and corrosion 8.5 Mechanical or electrical cycle ageing 8.6 Vibration ageing 8.6.1 General |
| 34 | 8.6.2 Ageing from non-seismic vibration conditions 8.6.3 Hydrodynamic loads 8.6.4 Seismic ageing (OBE/S1) 9 Testing 9.1 General 9.1.1 Test programme |
| 36 | 9.1.2 Mounting 9.1.3 Monitoring 9.1.4 Loading |
| 37 | 9.1.5 Refurbishment 9.1.6 Exploratory tests |
| 39 | 9.1.7 Seismic ageing (OBE/S1) 9.2 Proof and generic testing |
| 40 | 9.3 Fragility testing 9.4 Component testing 9.5 Assembly testing 9.5.1 General |
| 41 | 9.6 Test methods 9.6.1 General |
| 42 | 9.6.2 Single-frequency test |
| 44 | Figures Figure 1 – Sine beat Figure 2 – Decaying sine |
| 45 | 9.6.3 Multiple-frequency tests |
| 48 | Figure 3 – Random spectrum with superimposed sine beats |
| 49 | Figure 4 – Resonant amplification versus cycles per beat |
| 50 | 9.6.4 Other tests 9.6.5 Test duration and low-cycle fatigue potential 9.6.6 Multi-axis tests |
| 52 | 9.6.7 Line-mounted equipment |
| 53 | 9.6.8 Additional tests 9.7 Test documentation 10 Qualification by similarity 10.1 General 10.2 Excitation 10.3 Physical systems |
| 54 | 10.4 Safety function 11 Analysis 11.1 General |
| 55 | 11.2 Seismic analysis methods 11.2.1 General |
| 56 | 11.2.2 Static analysis 11.2.3 Static coefficient analysis 11.2.4 Dynamic analysis |
| 57 | 11.3 Nonlinear equipment response 11.4 Other dynamic loads 11.5 Seismic analysis results |
| 58 | 11.6 Documentation of analysis 12 Combined analysis and testing 12.1 General 12.2 Modal testing 12.2.1 General 12.2.2 Normal-mode method |
| 59 | 12.2.3 Transfer-function method 12.2.4 Analytical methods utilizing test data 12.2.5 Qualification 12.3 Extrapolation for similar equipment 12.3.1 General 12.3.2 Test method |
| 60 | 12.3.3 Analysis 12.4 Shock testing 12.5 Extrapolation for multi-cabinet assemblies 12.6 Other test/analysis |
| 61 | 13 Documentation 13.1 General 13.2 Seismic qualification report 13.2.1 General 13.2.2 Analysis 13.2.3 Testing |
| 62 | 13.2.4 Combined analysis and testing or similarity |
| 63 | Annex A (normative)Experience-based seismic qualification A.1 General A.2 Earthquake experience data A.2.1 General A.2.2 Characterization of the earthquake experience motions |
| 64 | A.2.3 Earthquake experience spectrum (EES) A.2.4 Characterization of reference equipment class |
| 65 | Table A.1 – EES reduction factor based on number of independent items |
| 66 | A.2.5 Qualification of candidate equipment |
| 67 | A.3 Test experience data A.3.1 General A.3.2 Characterization of test experience input motions A.3.3 Test experience spectra (TES) |
| 68 | A.3.4 Characterization of reference equipment class |
| 69 | A.3.5 Qualification of candidate equipment A.4 Special considerations A.4.1 Inherently rugged equipment |
| 70 | A.4.2 Limitations A.5 Experience-based documentation A.5.1 General |
| 71 | A.5.2 Reference data A.5.3 Candidate equipment qualification |
| 72 | Annex B (informative)Measurement of zero period acceleration |
| 73 | Annex C (informative)Frequency content and stationarity |
| 74 | Annex D (informative)Fragility testing D.1 General D.2 Excitation motion |
| 75 | D.3 Application of results D.4 Other considerations |
| 77 | Annex E (informative)Test duration and number of cycles |
| 78 | Figure E.1 – Fractional cycles to obtain one equipment maximum peak cycle |
| 79 | Figure E.2 – Equivalent peak-stress cycles induced by stationary random motion Figure E.3 – Equivalent peak-stress cycles inducedby stationary random motion to 20 Hz |
| 81 | Annex F (informative)Statistically independent motions |
| 82 | Annex G (informative)Seismic qualification illustrative flowcharts G.1 General G.2 Establishment of seismic conditions and acceptance criteria G.3 Qualification by testing G.4 Qualification by analysis G.5 Qualification by combination of analysis and testing |
| 83 | Figure G.1 – Seismic qualification flowchart |
| 84 | Figure G.2 – Seismic qualification test flowchart |
| 85 | Figure G.3 – Seismic qualification analysis flowchart |
| 86 | Figure G.4 – Seismic qualification analysis and test flowchart |
| 87 | Bibliography |
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BS EN IEC/IEEE 60980-344:2021
Nuclear facilities. Equipment important to safety. Seismic qualification Published By Publication Date Number of Pages…
