Detail of NB/T 20003.4-2021

Introduction of NB/T 20003.4-2021

NB/T 20003.4-2021 Non-destructive testing for mechanical components in nuclear island of nuclear power plants - Part 4: Penetrant testing 1 Scope This document specifies the technical requirements for penetrant testing of mechanical components in nuclear island of nuclear power plants. This document is applicable to penetrant testing during the manufacturing and installation of plates, forgings, bars, castings, pipes and welded joints in 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 5097 Non-destructive Testing - Penetrant testing and magnetic particle testing - Viewing conditions GB 11533 Standard for logarithmic visual acuity charts GB/T 12604.3 Non-destructive testing - Terminology - Terms used in penetrant testing GB/T 18851.2 Non-destructive testing - Penetrant testing - Part 2: Testing of penetrant materials GB/T 18851.3 Non-destructive testing - Penetrant testing - Part 3: Reference test blocks GB/T 18851.4 Non-destructive testing - Penetrant testing - Part 4: Equipment JB/T 6064 Non-destructive testing - General specification for penetrant blocks NB/T 20003.1 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 12604.3 and NB/T 20003.1 apply. 3.1 relevant indication trace indication formed by the penetrant bled out from the defects, which is also referred to as defect indication 3.2 non-relevant indication indication caused by external factors unrelated to the defects 3.3 false indication penetrant indication caused by penetrant contamination, testing environment, etc. 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 vision shall not be less than 4.8, and the examination 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. Penetrant testing shall be conducted following the effective testing procedures.

Contents of NB/T 20003.4-2021

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 General requirements 5 Penetrant testing equipment and materials 6 Testing methods 7 Operation method of penetrant testing 8 Testing report Annex A (Informative) Schematic diagram for fluorescent and colour contrast penetrant testing process procedures Annex B (Normative) Verification techniques for penetrant testing at non-standard temperatures