Guidelines for in-service inspections for primary coolant circuit components of light water reactors — Part 5: Eddy current testing of steam generator heating tubes (ISO 20890-5:2020)
This document gives guidelines for pre-service inspection (PSI) and in-service inspections (ISI) by eddycurrent tests on non-ferromagnetic steam generator heating tubes of light water reactors, whereby thetest is carried out using mechanised test equipment outwards from the tube inner side.An in-service eddy current test of steam generator heating tube plugs as a component of the primarycircuit is not an object of this document. Owing to the different embodiments of steam generatorheating tube plugs, the use of specially adapted test systems to be qualified is necessary.Test systems for the localisation of inhomogeneities (surface) and requirements for test personnel, testdevices, the preparation of test and device systems, the implementation of the testing as well as therecording are defined.NOTE Data concerning the test section, test extent, inspection period, inspection interval and evaluation ofindications is defined in the nuclear safety standards.It is recommended that the technical specifications are based on experience on U-tube bends with evenbend radius (similar to the S/ KWU design). To test other kind of tube bends (e.g. U-tube bends with two90° bends) further qualifications will be provided.
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