Detail of NB/T 20003.6-2021

Introduction of NB/T 20003.6-2021

NB/T 20003.6-2021 Non-destructive testing for mechanical components in nuclear island of nuclear power plants - Part 6: Eddy current testing 1 Scope This document specifies the technical requirements for eddy current testing of tube products for mechanical components in nuclear island of nuclear power plants. This document is applicable to eddy current testing during manufacturing and installation of tube products for mechanical components in nuclear island of nuclear power plants. 2 Normative references The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 12604.6 Non-destructive testing - Terminology - Terms used in eddy current testing NB/T 20003.1-2021 Non-destructive testing for mechanical components in nuclear island of nuclear power plants - Part 1: General requirements 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 12604.6 and NB/T 20003.1 and the following apply. 3.1 reference tube sample tube used for adjusting and reviewing testing systems and processing artificial defects 3.2 testing coil toroidal coil or coil group that induces eddy current signals 4 General requirements 4.1 Testing personnel The requirements specified in 5.1 of NB/T 20003.1-2021 shall apply. 4.2 Testing documents 4.2.1 Basic requirements for testing documents The testing procedures, process cards or other testing documents shall meet the requirements of 5.4 in NB/T 20003.1-2021. Eddy current testing shall be carried out in accordance with valid written testing documents. 4.2.2 Main contents of testing procedures The following contents shall be included: ——application scope; ——design documents, standards, and regulations referenced; ——qualification of testing personnel; ——designation, nominal outer diameter and nominal thickness of the tube; ——testing equipment: eddy current instruments, testing coils, automatic testing devices, reference tubes, etc.; ——testing conditions: testing time, testing area and surface conditions; ——adjustment of testing system: testing frequency setting, phase adjustment, sensitivity adjustment, etc.; ——reviewing of testing system; ——testing technology; ——recording guidelines; ——acceptance criteria; ——filing and preservation of testing documents, records, reports and other information; ——preparation, examination and approval of procedures.

Contents of NB/T 20003.6-2021

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 General requirements 5 Testing equipment 6 Testing conditions 7 Equipment adjustment and review 8 Testing technology 9 Testing report Annex A (Normative) Outer feed-through coil eddy current testing of tube products Annex B (Normative) Inner feed-through coil eddy current testing of non-ferromagnetic heat exchanger tubes Annex C (Normative) Background noise control for eddy current testing of steam generator tubes Annex D (Normative) Control of eddy current testing signal indication after steam generator tube bending Annex E (Normative) Method for evaluating the signal indication depth on the inner wall of non-ferromagnetic tubes Bibliography