BS ISO 20890-4:2020 pdf download – Guidelines for in-service inspections for primary coolant circuit components of light water reactors Part 4: Visual testing 4 Inspection technique Visual testing is used to recognise deviations from the expected state.This state is specified in the testprocedures. Depending on the test assignment, the visual testing is conducted either as a general visualtesting or a selective visual testing. Depending on the accessibility and required detail recognition,direct or remote visual testing is used, whereby the latter can be carried out as a mechanized visualtesting.The local radiation dose rate shall be considered when selecting the inspection techniques andauxiliaries. The suitability of the inspection technique and the combined device system shall be validated accordingto the requirements of the applicable nuclear safety standards. NOTE1 The procedure for the qualification of the inspection techniques or the combined device system isdescribed in ENIQ report nr.31[3]. NOTE2The visual testing test method discussed in this documentinvolves a standardized test method whoseapplication is realised based on standard test procedures relating to nuclear power plants. A qualification asabove can be necessary in individual cases if there are significant deviations from the specifications from thetest procedures. Ageneral test procedure shall be prepared.Annex B contains the items of the general test procedure.5 Requirements 5.1Test personnel 5.1.1 Task of NDT personnel NDT personnell4 have a great responsibility, not only with respect to their employers or contractorsbut also under the rules of good workmanship.The NDT personnel shall be independent and free fromeconomic influences with regard to his test results, otherwise the results may be compromised.TheNDT personnel shall be aware of the importance of his signature and the consequences of incorrecttest results for safety, health and environment. Under legal aspects, the falsification of certificates is anoffence and judged according to the national legal regulations.A tester may find himself in a conflictingsituation about his findings with his employer, the responsible authorities or legal requirements. Finally, the NDT personnel is responsible for all interpretations of test results carrying his signature.NDT personnel should never sign test reports beyond their certification (see Table 1). NOTE For reasons of readability, the male form is used with personal names, however the female form isalso always intended. 5.1.2Personnel requirements The test personnel comprise the test inspector, the test supervisor and possibly the operating personnelfor the test robot. Those personnel, using qualified non-destructive testing (NDT) procedures and equipment, should be qualified through one or any combination of the...
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