This Subsection contains requirements for the material, design, fabrication, and examination required in the manufacture and installation of core support structures. Core support structures are those structures or parts of structures which are designed to provide direct support or restraint of the core (fuel & blanket assemblies) within the reactor pressure vessel. Careful application of this Section will help users to comply with applicable regulations within their jurisdictions, while achieving the operational, cost and safety benefits to be gained from the many industry best-practices detailed within these volumes.

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5	TABLE OF CONTENTS
7	LIST OF SECTIONS
8	INTERPRETATIONS CODE CASES
9	FOREWORD
11	STATEMENT OF POLICY ON THE USE OF THE ASME SINGLE CERTIFICATION MARK AND CODE AUTHORIZATION IN ADVERTISING STATEMENT OF POLICY ON THE USE OF ASME MARKING TO IDENTIFY MANUFACTURED ITEMS
12	SUBMITTAL OF TECHNICAL INQUIRIES TO THE BOILER AND PRESSURE VESSEL STANDARDS COMMITTEES
15	PERSONNEL
36	ORGANIZATION OF SECTION III 1 GENERAL
37	2 SUBSECTIONS 3 ARTICLES 4 SUBARTICLES 5 SUBSUBARTICLES 6 PARAGRAPHS 7 SUBPARAGRAPHS 8 SUBSUBPARAGRAPHS
38	9 REFERENCES
40	SUMMARY OF CHANGES
42	LIST OF CHANGES IN RECORD NUMBER ORDER
43	CROSS-REFERENCING AND STYLISTIC CHANGES IN THE BOILER AND PRESSURE VESSEL CODE
45	Article NG-1000 Introduction NG-1100 Scope NG-1110 Aspects of Construction Covered by These Rules NG-1120 Definition of Structures and Application of These Rules to Them NG-1130 Boundaries of Jurisdiction Applicable to This Subsection
47	Figures Figure NG-1131-1 Jurisdictional Boundary Between Core Support Structure and Reactor Pressure Vessel
48	Article NG-2000 Material NG-2100 General Requirements for Material NG-2110 Scope of Principal Terms Employed NG-2120 Material for Core Support Structures
49	NG-2130 Certification of Material NG-2140 Welding Material NG-2150 Material Identification NG-2160 Deterioration of Material in Service NG-2170 Heat Treatment to Enhance Impact Properties NG-2180 Procedures for Heat Treatment of Material NG-2190 Temporary Attachment Material NG-2200 Material Test Coupons and Specimens for Ferritic Steel Material NG-2210 Heat Treatment Requirements
50	NG-2220 Procedure for Obtaining Test Coupons and Specimens for Quenched and Tempered Material
52	NG-2300 Fracture Toughness Requirements for Material NG-2310 Material to Be Impact Tested NG-2320 Impact Test Procedures
53	NG-2330 Test Requirements and Acceptance Standards Tables Table NG-2331(a)-1 Required Cv Values for Core Structure Material With 2 in. (50 mm) Maximum Thickness (Other Than Threaded Structural Fasteners) Table NG-2333-1 Required Cv Values for Threaded Structural Fastener Material
54	NG-2340 Number of Impact Tests Required NG-2350 Retests NG-2360 Calibration of Instruments and Equipment
55	NG-2400 Welding Material NG-2410 General Requirements NG-2420 Required Tests NG-2430 Weld Metal Tests
57	Table NG-2432.1-1 Sampling of Welding Materials for Chemical Analysis Table NG-2432.2-1 Welding Material Chemical Analysis
58	NG-2440 Storage and Handling of Welding Material Figure NG-2433.1-1 Weld Metal Delta Ferrite Content
59	NG-2500 Examination and Repair of Core Support Structure Material NG-2510 Examination of Core Support Structure Material NG-2520 Examination After Quenching and Tempering NG-2530 Examination and Repair of Plate
60	NG-2540 Examination and Repair of Forgings and Bars
62	NG-2550 Examination and Repair of Seamless and Welded Tubular Products and Fittings
63	NG-2570 Examination and Repair of Statically and Centrifugally Cast Products
66	NG-2580 Examination of Threaded Structural Fasteners
67	NG-2600 Material Organizations’ Quality System Programs NG-2610 Documentation and Maintenance of Quality System Programs
68	Article NG-3000 Design NG-3100 General Design NG-3110 Loading Criteria
69	NG-3120 Special Considerations NG-3130 General Design Rules
72	NG-3200 Design by Analysis NG-3210 Design Criteria
76	NG-3220 Stress Limits for Other Than Threaded Structural Fasteners
77	Table NG-3217-1 Classification of Stress Intensity in Core Support Structures for Some Typical Cases
78	Figure NG-3221-1 Stress Categories and Limits of Stress Intensities for Design Loadings
79	Figure NG-3222-1 Stress Categories and Limits of Stress Intensities for Service Levels A and B
83	Figure NG-3224-1 Stress Categories and Limits of Stress Intensities for Service Level C
87	NG-3230 Stress Limits for Threaded Structural Fasteners Table NG-3228-1 Values of m, n, and Tmax for Various Classes of Permitted Materials
88	Figure NG-3232-1 Stress Intensity Limits for Design of Threaded Structural Fasteners
89	NG-3300 Core Support Structure Design NG-3310 General Requirements
90	NG-3320 Design Considerations NG-3350 Design for Welded Construction
91	Figure NG-3351(a)-1 Typical Locations of Joints of Several Categories
92	Figure NG-3351(a)-2 Typical Welded Joint Category Locations
93	Table NG-3352-1 Permissible Welded Joints and Design Factors
94	Article NG-4000 Fabrication and Installation NG-4100 General Requirements NG-4110 Introduction NG-4120 Certification of Material and Fabrication by Certificate Holder NG-4130 Repair of Material
95	NG-4200 Forming, Fitting, and Aligning NG-4210 Cutting, Forming, and Bending
96	NG-4230 Fitting and Aligning NG-4240 Requirements for Weld Joints in Components NG-4300 Welding Qualifications NG-4310 General Requirements
97	NG-4320 Welding Qualifications, Records, and Identifying Stamps NG-4330 General Requirements for Welding Procedure Qualification Tests
100	NG-4400 Rules Governing Making, Examining, and Repairing Welds NG-4410 Precautions to Be Taken Before Welding NG-4420 Rules for Making Welded Joints
101	NG-4430 Welding of Temporary Attachments and Their Removal
102	Figure NG-4427-1 Fillet and Socket Weld Details and Dimensions
103	NG-4450 Repair of Weld Metal Defects NG-4500 Brazing NG-4600 Heat Treatment NG-4610 Welding Preheat Requirements
104	NG-4620 Postweld Heat Treatment
105	Table NG-4622.1-1 Mandatory Requirements for Postweld Heat Treatment (PWHT) of Welds
106	Table NG-4622.4(c)-1 Alternative Holding Temperatures and Times
107	Table NG-4622.7(b)-1 Exemptions to Mandatory PWHT
108	NG-4630 Heat Treatment of Welds Other Than the Final Postweld Heat Treatment NG-4650 Heat Treatment After Bending or Forming NG-4660 Heat Treatment of Electroslag Welds NG-4700 Mechanical Joints NG-4710 Threaded Structural Fasteners NG-4720 Temporary Fasteners and Their Removal
109	Article NG-5000 Examination NG-5100 General Requirements for Examination NG-5110 Procedures, Qualifications, and Evaluation Table NG-5111-1 Thickness, IQI Designations, Essential Holes, and Wire Diameters
110	NG-5120 Time of Examination of Welds NG-5130 Examination of Weld Edge Preparation Surfaces NG-5200 Required Examination of Welds NG-5210 Permissible Examination Methods
111	NG-5220 Requirements for Radiography or Ultrasonic and Liquid Penetrant or Magnetic Particle Examination NG-5230 Requirements for Liquid Penetrant or Magnetic Particle Examination NG-5260 Requirements for Surface Visual Examination NG-5270 Hard Surfacing NG-5300 Acceptance Standards NG-5320 Radiographic Acceptance Standards
112	NG-5330 Ultrasonic Acceptance Standards NG-5340 Magnetic Particle Acceptance Standards NG-5350 Liquid Penetrant Acceptance Standards
113	NG-5360 Visual Examination Acceptance Standards NG-5500 Qualifications and Certification of Nondestructive Examination Personnel NG-5510 General Requirements NG-5520 Personnel Qualification, Certification, and Verification
114	NG-5530 Records
115	Article NG-8000 Nameplates, Stamping With Certification Mark, and Reports NG-8100 Requirements
116	Endnotes

Published By	Publication Date	Number of Pages
ASME	2021


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Standard Title	ASME BPVC – III – 1 – NG -2021 BPVC Section III, Rules for Construction of Nuclear Facility Components, Division 1, Subsection NG, Core Support Structures
Published Code	ASME
Publication Date	2021

ASME BPVC III 1 NG 2021

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