Guidelines for in-service inspections for primary coolant circuit components of light water reactors. Eddy current testing of steam generator heating tubes
27.120.10 - Reactor engineering
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. Owing 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.
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.
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