BS ISO 20890-2 pdf free download

BS ISO 20890-2-2020 pdf free download.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 conjunctiowith 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
<visual testing> 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
<visual testing> 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].BS ISO 20890-2 pdf download.