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  • BSI
    BS ISO 20890-1:2020 Guidelines for in-service inspections for primary coolant circuit components of light water reactors - Mechanized ultrasonic testing
    Edition: 2020
    $418.55
    / user per year

Description of BS ISO 20890-1:2020 2020

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

  1. fault indications (e.g. on austenitic weld seams or complex geometry),

  2. indications due to geometry (e.g. in case of root concavity),

  3. complex geometries (e.g. fitting weld seams), or

  4. 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:

  1. extent of examination and scanning plans;

  2. acceptance criteria;

  3. UT techniques for dissimilar metal welds and for sizing (have to be qualified separately);

  4. immersion techniques;

  5. 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.



Standard NumberBS ISO 20890-1:2020
TitleGuidelines for in-service inspections for primary coolant circuit components of light water reactors - Mechanized ultrasonic testing
StatusDefinitive
Publication Date2020-06-19
Identical National Standard OfISO 20890-1
DescriptorsMechanical testing, Metals, Fusion welding, Qualification approval, Process specification, Arc welding, Nickel alloys, Welding, Steels, Gas welding, Nickel, Approval testing
ICS27.120.10 Reactor engineering
CommitteeNCE/3
ISBN978 0 580 93442 1
PublisherBSI
Pages42

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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