ISO 20890-1:2020
(Main)Guidelines for in-service inspections for primary coolant circuit components of light water reactors — Part 1: Mechanized ultrasonic testing
Guidelines for in-service inspections for primary coolant circuit components of light water reactors — Part 1: Mechanized ultrasonic testing
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 — fault indications (e.g. on austenitic weld seams or complex geometry), — indications due to geometry (e.g. in case of root concavity), — complex geometries (e.g. fitting weld seams), or — 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. NOTE 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: — extent of examination and scanning plans; — acceptance criteria; — UT techniques for dissimilar metal welds and for sizing (have to be qualified separately); — immersion techniques; — 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.
Lignes directrices pour les contrôles périodiques des composants du circuit primaire des réacteurs à eau légère — Partie 1: Contrôle mécanique par ultrasons
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INTERNATIONAL ISO
STANDARD 20890-1
First edition
2020-06
Guidelines for in-service inspections
for primary coolant circuit
components of light water reactors —
Part 1:
Mechanized ultrasonic testing
Lignes directrices pour les contrôles périodiques des composants du
circuit primaire des réacteurs à eau légère —
Partie 1: Contrôle mécanique par ultrasons
Reference number
©
ISO 2020
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Test systems . 7
4.1 Preliminary remark . 7
4.2 General . 7
4.3 Validation and localisation of reflectors. 8
4.3.1 Pulse-echo technique (PE technique) . 8
4.3.2 Transmitter-Receiver technique (TR-technique) . 8
4.3.3 Tandem technique . 8
4.3.4 Inspection technique with mode conversion . 8
4.3.5 V-transmission technique . 9
4.3.6 Phased-Array technique (PA). 9
4.3.7 Preferred angles of incidence and wave modes for search techniques . 9
5 Requirements .10
5.1 Test personnel .10
5.1.1 Task of NDT personnel . .10
5.1.2 Personnel requirements .10
5.2 Test object .11
5.3 Ultrasonic test equipment .11
5.3.1 Preliminary remark .11
5.3.2 Test robot .11
5.3.3 Ultrasonic test device .12
5.3.4 Data acquisition and analysis .13
5.3.5 UT probe .13
5.3.6 UT probe holders .15
5.3.7 UT probe cable (ultrasonic cable) .16
5.4 Couplant .16
5.5 Reference reflectors .16
5.6 Calibration block and reference or test block .17
5.7 Data storage medium .17
6 Testing .17
6.1 Preparation .17
6.1.1 General.17
6.1.2 Probe data sheets .17
6.1.3 Probe system .17
6.1.4 Test robot .18
6.1.5 Ultrasonic test device .18
6.1.6 Setting the test level .18
6.1.7 Data acquisition system (DAS) .19
6.1.8 Ultrasonic test equipment .19
6.2 Implementation .19
6.3 Visualisation of the digitized and saved measuring data .20
6.4 Analysis of indications .20
6.5 Final measures .20
7 Recording .21
7.1 Recording the setup for the ultrasonic test equipment .21
7.2 Test record and test report .21
7.3 Indication list .21
7.4 Findings record .22
Annex A (informative) Examples of test systems and transceiver probe arrangements .23
Annex B (informative) Forms .25
Annex C (informative) Findings record .28
Annex D (informative) Amplification compensation .29
Annex E (informative) Standard test procedures and test specifications .32
Bibliography .33
iv © ISO 2020 – All rights reserved
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 85, Nuclear energy, nuclear technologies,
and radiological protection, Subcommittee SC 6, Reactor technology.
A list of all parts in the ISO 20890 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
INTERNATIONAL STANDARD ISO 20890-1:2020(E)
Guidelines for in-service inspections for primary coolant
circuit components of light water reactors —
Part 1:
Mechanized ultrasonic testing
1 Scope
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 u
...
INTERNATIONAL ISO
STANDARD 20890-1
First edition
2020-06
Guidelines for in-service inspections
for primary coolant circuit
components of light water reactors —
Part 1:
Mechanized ultrasonic testing
Lignes directrices pour les contrôles périodiques des composants du
circuit primaire des réacteurs à eau légère —
Partie 1: Contrôle mécanique par ultrasons
Reference number
©
ISO 2020
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Test systems . 7
4.1 Preliminary remark . 7
4.2 General . 7
4.3 Validation and localisation of reflectors. 8
4.3.1 Pulse-echo technique (PE technique) . 8
4.3.2 Transmitter-Receiver technique (TR-technique) . 8
4.3.3 Tandem technique . 8
4.3.4 Inspection technique with mode conversion . 8
4.3.5 V-transmission technique . 9
4.3.6 Phased-Array technique (PA). 9
4.3.7 Preferred angles of incidence and wave modes for search techniques . 9
5 Requirements .10
5.1 Test personnel .10
5.1.1 Task of NDT personnel . .10
5.1.2 Personnel requirements .10
5.2 Test object .11
5.3 Ultrasonic test equipment .11
5.3.1 Preliminary remark .11
5.3.2 Test robot .11
5.3.3 Ultrasonic test device .12
5.3.4 Data acquisition and analysis .13
5.3.5 UT probe .13
5.3.6 UT probe holders .15
5.3.7 UT probe cable (ultrasonic cable) .16
5.4 Couplant .16
5.5 Reference reflectors .16
5.6 Calibration block and reference or test block .17
5.7 Data storage medium .17
6 Testing .17
6.1 Preparation .17
6.1.1 General.17
6.1.2 Probe data sheets .17
6.1.3 Probe system .17
6.1.4 Test robot .18
6.1.5 Ultrasonic test device .18
6.1.6 Setting the test level .18
6.1.7 Data acquisition system (DAS) .19
6.1.8 Ultrasonic test equipment .19
6.2 Implementation .19
6.3 Visualisation of the digitized and saved measuring data .20
6.4 Analysis of indications .20
6.5 Final measures .20
7 Recording .21
7.1 Recording the setup for the ultrasonic test equipment .21
7.2 Test record and test report .21
7.3 Indication list .21
7.4 Findings record .22
Annex A (informative) Examples of test systems and transceiver probe arrangements .23
Annex B (informative) Forms .25
Annex C (informative) Findings record .28
Annex D (informative) Amplification compensation .29
Annex E (informative) Standard test procedures and test specifications .32
Bibliography .33
iv © ISO 2020 – All rights reserved
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 85, Nuclear energy, nuclear technologies,
and radiological protection, Subcommittee SC 6, Reactor technology.
A list of all parts in the ISO 20890 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
INTERNATIONAL STANDARD ISO 20890-1:2020(E)
Guidelines for in-service inspections for primary coolant
circuit components of light water reactors —
Part 1:
Mechanized ultrasonic testing
1 Scope
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 u
...
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