Standard No.:	NB/T 20003.5-2021
English Name:	Non-destructive testing for mechanical components in nuclear island of nuclear power plants— Part 1:Magnetic particle testing
Chinese Name:	核电厂核岛机械设备无损检测 第5部分：磁粉检测
Professional Classification:	NB    Professional Standard - Energy
Source Content Issued by:	China Energy Administration
Issued on:	2021-01-07
Implemented on:	2021-7-1
Status:	valid
Superseding:	NB/T 20003.5-2010 Non-destructive Testing for Mechanical Components in Nuclear Island of Nuclear Power Plants - Part 5: Magnetic Particle Testing
Target Language:	English
File Format:	PDF
Word Count:	13500 words
Translation Price(USD):	405.0
Delivery:	via email in 1 business day

NB/T 20003.5-2021 Non-destructive testing for mechanical components in nuclear island of nuclear power plants - Part 5: Magnetic particle testing 1 Scope This document specifies the technical requirements for continuous magnetic particle testing of mechanical components in nuclear island of nuclear power plants. This document is applicable to magnetic particle testing during the manufacturing and installation of ferromagnetic materials, parts and components, and welded joints in mechanical components in nuclear island of nuclear power plants. It is not applicable to the testing of non-ferromagnetic materials. 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 4956 Non-magnetic coatings on magnetic substrates - Measurement of coating thickness - Magnetic method GB 11533 Standard for logarithmic visual acuity charts GB/T 12604.5 Non-destructive testing - Terminology - Terms used in magnetic particle testing GB/T 15822.2 Non-destructive testing-Magnetic particle testing - Part 2: Detection media GB/T 15822.3 Non-destructive Testing - Magnetic Particle Testing - Part 3: Equipment GB/T 23906 Non-destructive testing - Rings for magnetic particle testing GB/T 23907 Non-destructive testing - Shims for magnetic particle testing JB/T 6870 Specifications for the mobile rotating-field flaw detectors JB/T 7411 Non-destructive testing instruments - Specification of electricity magnetic yoke magnetic particle flaw detector JB/T 8290 Non-destructive testing instruments - Magnetic particle flaw detectors 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 purpose of this document, the terms and definitions given in GB/T 12604.5 and NB/T 20003.1-2021 apply. 3.1 magnetization by electric current flow establishing a magnetic field by passing electric current (AC, rectified, or DC) through the entire workpiece or a part of it 3.2 magnetization by magnetic flow establishing a magnetic field in the entire workpiece or a part of it by electromagnetic yoke or indirect induction 3.3 relevant indication magnetic particle indication formed by the flux leakage field caused by defects attracting magnetic particles during magnetic particle testing, generally referred to as defect indication 3.4 non-relevant indication magnetic particle indication formed by the flux leakage field caused by changes in cross-section or material permeability attracting magnetic particles during magnetic particle testing 3.5 false indication magnetic particle indication not formed by the flux leakage field attracting magnetic particles 4 General requirements 4.1 Testing personnel The testing personnel shall meet the requirements of NB/T 20003.1. The testing personnel shall undergo vision examination annually. Their uncorrected or corrected near vision shall not be less than 4.8, and the test method shall meet the requirements of GB 11533. The testing personnel shall undergo color vision examination annually, and such examination shall not reveal color blindness or color weakness. 4.2 Testing documents The testing procedures, process cards or other testing documents shall meet the requirements of NB/T 20003.1-2021, 5.4. Magnetic particle testing shall be conducted according to effective testing procedures. The testing procedures shall cover at least the following contents: ——Scope of application: type, size, testing range and material of the tested workpiece; ——Reference codes, standards, design documents, etc.; ——Qualification of testing personnel;

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 General requirements 5 Magnetic particle testing equipment and apparatus 6 Calibration and verification 7 Magnetizing electric currents 8 Testing methods 9 Testing process 10 Testing report Annex A (Normative) System performance verification of fixed magnetic particle flaw detectors Annex B (Normative) Standard test rings, and reference test pieces for performance test of detection media Annex C (Informative) Relationship among peak, average and effective values of several sine wave currents Annex D (Informative) Typical magnetization methods of welded joints