BS ISO 20890-1:2020
$167.15
Guidelines for in-service inspections for primary coolant circuit components of light water reactors – Mechanized ultrasonic testing
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 42 |
This document gives guidelines for pre-service-inspections (PSI) and in-service inspections (ISI) with mechanized ultrasonic test (UT) devices on components of the reactor coolant circuit of light water reactors. This document is also applicable on other components of nuclear installations.
Mechanized ultrasonic inspections are carried out in order to enable an evaluation in case of
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fault indications (e.g. on austenitic weld seams or complex geometry),
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indications due to geometry (e.g. in case of root concavity),
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complex geometries (e.g. fitting weld seams), or
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if a reduction in the radiation exposure of the test personnel can be attained in this way.
Ultrasonic test methods are defined for the validation of discontinuities (volume or surface open), requirements for the ultrasonic test equipment, for the preparation of test and device systems, for the implementation of the test and for the recording.
This document is applicable for the detection of indications by UT using normal-beam probes and angle-beam probes both in contact technique. It is to be used for UT examination on ferritic and austenitic welds and base material as search techniques and for comparison with acceptance criteria by the national referencing nuclear safety standards. Immersion technique and techniques for sizing are not in the scope of this document and are independent qualified.
Data concerning the test section, test extent, inspection period, inspection interval and evaluation of indications is defined in the applicable national nuclear safety standards.
Unless otherwise specified in national nuclear safety standards the minimum requirements of this document are applicable. This document does not define:
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extent of examination and scanning plans;
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acceptance criteria;
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UT techniques for dissimilar metal welds and for sizing (have to be qualified separately);
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immersion techniques;
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time-of-flight diffraction technique (TOFD).
It is recommended that UT examinations are nearly related to the component, the type and size of defects to be considered and are reviewed in specific national inspection qualifications.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 7 | Foreword |
| 9 | 1 Scope 2 Normative references |
| 10 | 3 Terms and definitions |
| 15 | 4 Test systems 4.1 Preliminary remark 4.2 General |
| 16 | 4.3 Validation and localisation of reflectors 4.3.1 Pulse-echo technique (PE technique) 4.3.2 Transmitter-Receiver technique (TR-technique) 4.3.3 Tandem technique 4.3.4 Inspection technique with mode conversion |
| 17 | 4.3.5 V-transmission technique 4.3.6 Phased-Array technique (PA) 4.3.7 Preferred angles of incidence and wave modes for search techniques |
| 18 | 5 Requirements 5.1 Test personnel 5.1.1 Task of NDT personnel 5.1.2 Personnel requirements |
| 19 | 5.2 Test object 5.3 Ultrasonic test equipment 5.3.1 Preliminary remark 5.3.2 Test robot |
| 20 | 5.3.3 Ultrasonic test device |
| 21 | 5.3.4 Data acquisition and analysis 5.3.5 UT probe |
| 23 | 5.3.6 UT probe holders |
| 24 | 5.3.7 UT probe cable (ultrasonic cable) 5.4 Couplant 5.5 Reference reflectors |
| 25 | 5.6 Calibration block and reference or test block 5.7 Data storage medium 6 Testing 6.1 Preparation 6.1.1 General 6.1.2 Probe data sheets 6.1.3 Probe system |
| 26 | 6.1.4 Test robot 6.1.5 Ultrasonic test device 6.1.6 Setting the test level |
| 27 | 6.1.7 Data acquisition system (DAS) 6.1.8 Ultrasonic test equipment 6.2 Implementation |
| 28 | 6.3 Visualisation of the digitized and saved measuring data 6.4 Analysis of indications 6.5 Final measures |
| 29 | 7 Recording 7.1 Recording the setup for the ultrasonic test equipment 7.2 Test record and test report 7.3 Indication list |
| 30 | 7.4 Findings record |
| 31 | Annex A (informative) Examples of test systems and transceiver probe arrangements |
| 33 | Annex B (informative) Forms |
| 36 | Annex C (informative) Findings record |
| 37 | Annex D (informative) Amplification compensation |
| 40 | Annex E (informative) Standard test procedures and test specifications |
| 41 | Bibliography |
