BS ISO 20890-5:2020 pdf free.Guidelines for in-service inspections for primary coolant circuit components of light water reactors Eddy current testing of steam generator heating tubes.
BS ISO 20890-5 This document gives guidelines for pre-service inspection (PSI) and in-service inspections ([ISI) by eddy current tests on non-ferromagnetic steam generator heating tubes of light water reactors, whereby the test 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 primary circuit is not an object of this document. 0wing to the different embodiments of steam generator heating 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, test devices, the preparation of test and device systems, the implementation of the testing as well as the recording are defined.NOTE Data concerning the test section, test extent, inspection period, inspection interval and evaluation of
indications is defined in the nuclear safety standards. It is recommended that the technical specifications are based on experience on U-tube bends with even bend radius (similar to the S/KWU design). To test other kind of tube bends (e.g. U-tube bends with two 90° bends) further qualifications will be provided.<eddy current testing> block of material representative of the material to be tested with similar electromagnetic properties containing well-defined artificial discontinuities, used to adjust the sensitivity and/or time base of the eddy current test equipment (3.15) in order to compare detected discontinuity indications (3.2) with those arising from the known artificial discontinuities Note 1 to entry: Specified metallurgical, geometrical and dimensional characteristics means for example material, weld seam implementation, form, wall thickness with reference characteristics (e.g. notches, drill holes) that are adapted to the test assignment. [SOURCE: ISO 5577:2017, 5.4.2] 3.15 eddy current test equipment eddy current test system, test robot and its measured data logging as well as the analysis unit
including software.BS ISO 20890-5 pdf download.