Detail of NB/T 20001-2013

Introduction of NB/T 20001-2013

1 Scope This standard specifies various requirements for identification; cutting and finishing without repair welding; forming and tolerance; assembly and alignment of welding part; heat exchanger pipe and pipe plate expanding connection; surface treatment, cleaning, flange bolt connection and heat treatment of mechanical components of PWR nuclear island within the specified range of GB/T 16702 during manufacturing process. This standard is applicable to the manufacture of mechanical components of PWR nuclear island and the installation of on-site mechanical components of PWR nuclear island. 2 Normative References The following referenced documents are indispensable for the application 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 139-2008 Standard Method for Using the Ferrous Sulfat (Fricke) Dosimeter to Measure Absorbed Dose in Water GB/T 912 Hot-rolled Sheets and Strips of Carbon Structural Steels and High Strength Low Alloy Structural Steels (GB/T 912-2008, ISO 4995: 2001, ISO 4996: 1996, NEQ) GB/T 1766-2008 Paints and Varnishes - Rating Schemes of Degradation of Coats GB/T 4956 Non-magnetic Coatings on Magnetic Substrates - Measurement of Coating Thickness - Magnetic Method (GB/T 4956-2003, ISO 2178: 1982 MOD) GB/T 5270 Metallic Coatings on Metallic Substrates - Electrodeposited and Chemically Deposited Coatings - Revies of Methods Available for Testing Adhesion (GB/T 5270-2005, ISO 2819: 1980, IDT) GB/T 7232 Terminology of Metal Heat Treatment GB/T 8076 Concrete Admixtures GB/T 8923-1988 Rust Grades and Preparation Grades of Steel Surfaces before Application of Paints and Related Products (ISO 8501.1: 1988, EQV) GB/T 9271-2008 Paints and Varnishes Standard Panels for Testing (ISO 1514: 2004, MOD) GB/T 11376-1997 Phosphate Conversion Coatings for Metals (ISO 9717: 1990, EQV) GB/T 16702 Design Rules for Mechanical Components of PWR Nuclear Islands GB/T 17569 Classification for the Items of Pressurized Water Reactor Nuclear Power Pants NB/T 20002 (All Parts) Welding Code for Mechanical Components of PWR Nuclear Islands NB/T 20003 (All Parts) Non-destructive Testing for Mechanical Components in Nuclear Island of Nuclear Power Plants NB/T 20004 Physical and Chemical Test Methods for Materials Used in Nuclear Island Components of Nuclear Power Plants ISO 4628.3: 1982 Paints and Varnishes - Evaluation of Degradation of Coatings - Designation of Quantity and Size of Defects, and of Intensity of Uniform Changes in Appearance - Part 3: Assessment of Degree of Rusting 3 Terms and Definitions For the purposes of this standard, the terms and definitions given in GB/T 16702 and the following apply. 3.1 process fluid liquid or gas with which each system or component is fully-filled during the normal operation of the nuclear power plant 3.2 thermal contraction technology process of generating contraction distortion without adopting mechanical method during cooling the pipe fitting or pipe section after locally heating them。 3.3 corrosion resistant surface component surface made of corrosion-resistant materials like austenitic stainless steel or nickel-based alloy and contacting or not contacting process fluid

Contents of NB/T 20001-2013

Foreword i 1 Scope 2 Normative References 3 Terms and Definitions 4 General Provisions 5 Identification 5.1 General Requirements 5.2 Methods 5.3 Texts and Symbols 5.4 Temporary Identification 5.5 Label 5.6 Summary List of Identification 6 Cutting and Finishing without Repair Welding 6.1 Cutting 6.2 Finishing without Repair Welding 7 Forming and Tolerance 7.1 Forming 7.2 Tolerance 8 Assembly and Alignment of Welding Part 8.1 General Requirements 8.2 Assembly and Alignment Tolerance of Two-side Welding or One-side Accessible Single Side Welding Joints 8.3 Assembly and Alignment Tolerance of Welded Joints Welded at Outer Side in case of Inaccessible Internal Surface 8.4 Assembly and Alignment Tolerance of Butt Welding Head Welded Joint 8.5 Pipe and Pipeline Assembly and Alignment Tolerance 8.6 Out-of-tolerance Finishing 9 Heat Exchanger Pipe and Pipe Plate Expanding Connection 9.1 Overview 9.2 Expanding Connection 9.3 Inspection 9.4 Reworking 10 Surface Treatment 10.1 General Requirements 10.2 Chromate Finish 10.3 Manganous Phosphate Treatment (Phosphating) 10.4 Painting 10.5 Nitriding Treatment 10.6 Electrolytic Tinning and Diffusion Treatment 10.7 Cadmium Plating 10.8 Other Metal Cladding and Surface Treatment 11 Cleaning 11.1 Overview 11.2 Cleanliness Level, Work Area and On-site Work Zone of Nuclear Power Plant 11.3 Cleanliness Inspection 11.4 Contamination Prevention 11.5 Requirements for Cleaning Method 11.6 Maintenance of Cleanliness 12 Flange Bolt Connection 12.1 Overview 12.2 Procedure 12.3 Assembly Requirements 12.4 Requirements for the Lubricant 12.5 Requirements for Threads 12.6 Requirements for the Flange 12.7 Requirements for Assembling Tools 12.8 Surface Treatment for Fasteners 13 Heat Treatment 13.1 General Requirements 13.2 Heat Treatment after Forming 13.3 Post-welding Heat Treatment 13.4 Dimensional Stabilization Treatment of Unstable Austenitic Stainless Steel Piece 13.5 Bright Annealing of Austenitic Stainless Steel Pieces Annex A (Normative) Forming Process Assessment Annex B (Normative) Heat Exchanger Pipe and Pipe Plate Expanding Connection Process Assessment Annex C (Normative) Test Method for Coating Film Assessment by Simulating LOCA Working Condition Annex D (Normative) Test Method for the Influence of γ Ray Irradiation on Coating Film Annex E (Normative) Determination of Coating Film Decontaminability Annex F (Normative) Cleanliness Inspection Annex G (Normative) Water Quality Annex H (Normative) Selection of Thermal Insulation Materials and Special Requirements for Installation Annex I (Normative) Chemical Analysis Methods for the Contents of Chlorine, Fluorine and Sulfur Bibliography