ISO 20890-4:2020
(Main)Guidelines for in-service inspections for primary coolant circuit components of light water reactors — Part 4: Visual testing
Guidelines for in-service inspections for primary coolant circuit components of light water reactors — Part 4: Visual testing
This document gives guidelines for pre-service inspection (PSI) and in-service inspections (ISI) for reactor coolant circuit components of light water reactors and their installations as direct or remote visual testing in the form of a — general visual testing (overview), or — selective visual testing (specific properties). This document is also applicable to other components of nuclear installations. The requirements in this document focuses on remote (mechanized) visual testing, but also specifies global requirements for direct visual testing. For specific requirements for direct visual testing of welds see ISO 17637. This document is not applicable to tests in respect to the general state that are carried out in conjunction with pressure and leak tests and regular plant inspections. This document specifies test methods that allow deviations from the expected state to be recognised, requirements for the equipment technology and test personnel, the preparation and performance of the testing as well as the recording. 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.
Lignes directrices pour les contrôles périodiques des composants du circuit primaire des réacteurs à eau légère — Partie 4: Examen visuel
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INTERNATIONAL ISO
STANDARD 20890-4
First edition
2020-06
Guidelines for in-service inspections
for primary coolant circuit
components of light water reactors —
Part 4:
Visual testing
Lignes directrices pour les contrôles périodiques des composants du
circuit primaire des réacteurs à eau légère —
Partie 4: Examen visuel
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 .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Inspection technique. 4
5 Requirements . 4
5.1 Test personnel . 4
5.1.1 Task of NDT personnel . . 4
5.1.2 Personnel requirements . 4
5.2 Test area . 6
5.3 Optical auxiliaries and combined device system . 6
5.3.1 General. 6
5.3.2 Image quality and resolution . 6
5.3.3 Construction . 7
5.3.4 Lighting equipment for the remote visual testing . 8
5.3.5 Data storage medium . 8
5.3.6 Test robots . 8
6 Testing . 8
6.1 Preparation . 8
6.1.1 General. 8
6.1.2 Test location . 9
6.2 Performance . 9
6.2.1 General. 9
6.2.2 Direct visual testing . .10
6.2.3 Remote visual testing .10
6.2.4 Mechanized visual testing .10
6.3 Evaluation .10
6.4 Final measures .10
7 Recording .11
Annex A (informative) Examples of a test image.12
Annex B (informative) Test procedures .13
Bibliography .14
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 on 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 the following
URL: www .iso .org/ iso/ foreword .html.
This document was prepared by 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.
iv © ISO 2020 – All rights reserved
INTERNATIONAL STANDARD ISO 20890-4:2020(E)
Guidelines for in-service inspections for primary coolant
circuit components of light water reactors —
Part 4:
Visual testing
1 Scope
This document gives guidelines for pre-service inspection (PSI) and in-service inspections (ISI) for
reactor coolant circuit components of light water reactors and their installations as direct or remote
visual testing in the form of a
— general visual testing (overview), or
— selective visual testing (specific properties).
This document is also applicable to other components of nuclear installations. The requirements in this
document focuses on remote (mechanized) visual testing, but also specifies global requirements for
direct visual testing. For specific requirements for direct visual testing of welds see ISO 17637.
This document is not applicable to tests in respect to the general state that are carried out in conjunction
with pressure and leak tests and regular plant inspections.
This document specifies test methods that allow deviations from the expected state to be recognised,
requirements for the equipment technology and test personnel, the preparation and performance of the
testing as well as the recording.
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.
2 Normative references
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.
ISO 8596, Ophthalmic optics — Visual acuity testing — Standard and clinical optotypes and their
presentation
ISO 9712:2012, Non-destructive testing — Qualification and certification of NDT personnel
ISO 18490, Non-destructive testing — Evaluation of vision acuity of NDT personnel
EN 1330-10, Non-destructive testing — Terminology — Part 10: Terms used in visual testing
EN 13018, Non-destructive testing — Visual testing — General principles
EN 13927, Non-destructive testing — Visual testing — Equipment
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1330-10 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
conspicuous indications
deviations in the actual state recorded during the visual testing from the expected target state
3.2
relevant indication
NDT indication (conspicuous indication) that is caused by condition or type of
discontinuity that requires evaluation
[SOURCE: ISO/TS 18173:2005, 2.24]
3.3
colour intensity
difference in a colour from the equally bright achromatic colour
Note 1 to entry: Colours with equally bright achromatic colour create the same grey tone in the black-white
appearance.
3.4
hue
chromatic and achromatic type of a colour
Note 1 to entry: Words like red, yellow, green etc. are used to refer to this in daily life.
Note 2 to entry: In this document achromatic colours means black and white and any type of grey.
3.5
data storage medium
storage medium for the storage of image information
3.6
direct visual testing
visual testing where there is an uninterrupted optical path from the observer's eye to the test area
Note 1 to entry: This test can be carried out with or without auxiliaries, e.g. magnifying glass, mirror, binoculars,
borescopes, endoscopes or fibre-optics.
[SOURCE: EN 1330-10:2003, 2.12, modified — The examples given in the Note are different.]
3.7
remote visual testing
visual testing where there is an interrupted optical path from the observer's eye to the test area
Note 1 to entry: Remote visual testing may include a device system that records, communicates, visualises and, if
necessary, stores image information.
[SOURCE: EN 1330-10:2003, 2.37, modified — Different systems are named in the Note.]
3.8
general visual testing
visual testing over areas of the component (3.10) to observe overall condition, integrity and state of
degradation
[SOURCE: EN 1330-10: 2003, 2.18]
2 © ISO 2020 – All rights reserved
3.9
selective visual testing
local visual testing for unique recognition of specified properties
Note 1 to entry: The selective visual testing is used in order to record the state of parts, components (3.10) or
surfaces to be examined in respect to cracks, wear, corrosion, eros
...
INTERNATIONAL ISO
STANDARD 20890-4
First edition
2020-06
Guidelines for in-service inspections
for primary coolant circuit
components of light water reactors —
Part 4:
Visual testing
Lignes directrices pour les contrôles périodiques des composants du
circuit primaire des réacteurs à eau légère —
Partie 4: Examen visuel
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 .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Inspection technique. 4
5 Requirements . 4
5.1 Test personnel . 4
5.1.1 Task of NDT personnel . . 4
5.1.2 Personnel requirements . 4
5.2 Test area . 6
5.3 Optical auxiliaries and combined device system . 6
5.3.1 General. 6
5.3.2 Image quality and resolution . 6
5.3.3 Construction . 7
5.3.4 Lighting equipment for the remote visual testing . 8
5.3.5 Data storage medium . 8
5.3.6 Test robots . 8
6 Testing . 8
6.1 Preparation . 8
6.1.1 General. 8
6.1.2 Test location . 9
6.2 Performance . 9
6.2.1 General. 9
6.2.2 Direct visual testing . .10
6.2.3 Remote visual testing .10
6.2.4 Mechanized visual testing .10
6.3 Evaluation .10
6.4 Final measures .10
7 Recording .11
Annex A (informative) Examples of a test image.12
Annex B (informative) Test procedures .13
Bibliography .14
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 on 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 the following
URL: www .iso .org/ iso/ foreword .html.
This document was prepared by 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.
iv © ISO 2020 – All rights reserved
INTERNATIONAL STANDARD ISO 20890-4:2020(E)
Guidelines for in-service inspections for primary coolant
circuit components of light water reactors —
Part 4:
Visual testing
1 Scope
This document gives guidelines for pre-service inspection (PSI) and in-service inspections (ISI) for
reactor coolant circuit components of light water reactors and their installations as direct or remote
visual testing in the form of a
— general visual testing (overview), or
— selective visual testing (specific properties).
This document is also applicable to other components of nuclear installations. The requirements in this
document focuses on remote (mechanized) visual testing, but also specifies global requirements for
direct visual testing. For specific requirements for direct visual testing of welds see ISO 17637.
This document is not applicable to tests in respect to the general state that are carried out in conjunction
with pressure and leak tests and regular plant inspections.
This document specifies test methods that allow deviations from the expected state to be recognised,
requirements for the equipment technology and test personnel, the preparation and performance of the
testing as well as the recording.
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.
2 Normative references
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.
ISO 8596, Ophthalmic optics — Visual acuity testing — Standard and clinical optotypes and their
presentation
ISO 9712:2012, Non-destructive testing — Qualification and certification of NDT personnel
ISO 18490, Non-destructive testing — Evaluation of vision acuity of NDT personnel
EN 1330-10, Non-destructive testing — Terminology — Part 10: Terms used in visual testing
EN 13018, Non-destructive testing — Visual testing — General principles
EN 13927, Non-destructive testing — Visual testing — Equipment
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1330-10 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
conspicuous indications
deviations in the actual state recorded during the visual testing from the expected target state
3.2
relevant indication
NDT indication (conspicuous indication) that is caused by condition or type of
discontinuity that requires evaluation
[SOURCE: ISO/TS 18173:2005, 2.24]
3.3
colour intensity
difference in a colour from the equally bright achromatic colour
Note 1 to entry: Colours with equally bright achromatic colour create the same grey tone in the black-white
appearance.
3.4
hue
chromatic and achromatic type of a colour
Note 1 to entry: Words like red, yellow, green etc. are used to refer to this in daily life.
Note 2 to entry: In this document achromatic colours means black and white and any type of grey.
3.5
data storage medium
storage medium for the storage of image information
3.6
direct visual testing
visual testing where there is an uninterrupted optical path from the observer's eye to the test area
Note 1 to entry: This test can be carried out with or without auxiliaries, e.g. magnifying glass, mirror, binoculars,
borescopes, endoscopes or fibre-optics.
[SOURCE: EN 1330-10:2003, 2.12, modified — The examples given in the Note are different.]
3.7
remote visual testing
visual testing where there is an interrupted optical path from the observer's eye to the test area
Note 1 to entry: Remote visual testing may include a device system that records, communicates, visualises and, if
necessary, stores image information.
[SOURCE: EN 1330-10:2003, 2.37, modified — Different systems are named in the Note.]
3.8
general visual testing
visual testing over areas of the component (3.10) to observe overall condition, integrity and state of
degradation
[SOURCE: EN 1330-10: 2003, 2.18]
2 © ISO 2020 – All rights reserved
3.9
selective visual testing
local visual testing for unique recognition of specified properties
Note 1 to entry: The selective visual testing is used in order to record the state of parts, components (3.10) or
surfaces to be examined in respect to cracks, wear, corrosion, eros
...
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