This Subsection contains requirements for the material, design, fabrication, and examination of supports which are intended to conform to the requirements for Classes 1, 2, 3, and MC construction. Nuclear power plant supports for which rules are specified in this Subsection are those metal supports which are designed to transmit loads from the pressure retaining barrier of the component or piping to the load carrying building structure. In some cases there may be intervening elements in the component support load path which are not constructed to the rules of this Section, such as diesel engines, electric motors, valve operators, coolers, and access structures. 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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PDF Pages	PDF Title
5	TABLE OF CONTENTS
10	LIST OF SECTIONS
11	INTERPRETATIONS CODE CASES
12	FOREWORD
14	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
15	SUBMITTAL OF TECHNICAL INQUIRIES TO THE BOILER AND PRESSURE VESSEL STANDARDS COMMITTEES
18	PERSONNEL
39	ORGANIZATION OF SECTION III 1 GENERAL
40	2 SUBSECTIONS 3 ARTICLES 4 SUBARTICLES 5 SUBSUBARTICLES 6 PARAGRAPHS 7 SUBPARAGRAPHS 8 SUBSUBPARAGRAPHS
41	9 REFERENCES
43	SUMMARY OF CHANGES
45	LIST OF CHANGES IN RECORD NUMBER ORDER
46	CROSS-REFERENCING AND STYLISTIC CHANGES IN THE BOILER AND PRESSURE VESSEL CODE
47	Article NF-1000 Introduction NF-1100 Scope and General Requirements NF-1110 Aspects of Construction Covered by These Rules NF-1120 Rules for Supports and Their Classification
48	NF-1130 Boundaries of Jurisdiction NF-1200 Types of Supports and Attachments NF-1210 Types of Supports
49	NF-1230 Welding Between Types of Supports NF-1240 Attachments
50	Figures Figure NF-1132-1 Typical Examples of Jurisdictional Boundaries Between Supports and the Building Structure
54	Figure NF-1214-1 Typical Standard Support Units
55	Article NF-2000 Material NF-2100 General Requirements for Material NF-2110 Scope of Principal Terms Employed NF-2120 Support Material
56	NF-2130 Certification of Material Tables Table NF-2121(a)-1 Material Tables Required for Supports
57	NF-2140 Welding Material NF-2150 Material Identification NF-2160 Deterioration of Material in Service NF-2170 Heat Treatment to Enhance Impact Properties NF-2180 Procedures for Heat Treatment of Material NF-2200 Material Test Coupons and Specimens for Ferritic Steel Material NF-2210 Heat Treatment Requirements
58	NF-2220 Procedure for Obtaining Test Coupons and Specimens for Quenched and Tempered Material
60	NF-2300 Fracture Toughness Requirements for Material NF-2310 Material to Be Impact Tested NF-2320 Impact Test Procedures Table NF-2311(b)-1 Exemptions From Impact Testing Under NF-2311(b)(9) and NF-2311(b)(10) for Material Thickness to 21⁄2 in. (64 mm), Inclusive
61	Figure NF-2311(b)-1 Impact Test Exemption Curves for Materials for Class 2, 3, and MC Supports
62	NF-2330 Test Requirements and Acceptance Standards
63	NF-2340 Number of Impact Tests Required Table NF-2331(a)-1 Required Cv Lateral Expansion Values for Class 1 Support Material Other Than Bolting Table NF-2331(a)-2 Required Cv Lateral Expansion Values for Class 2 and MC Support Material Other Than Bolting Table NF-2331(a)-3 Required Cv Lateral Expansion Values for Class 3 Support Material Other Than Bolting
64	NF-2350 Retests Table NF-2331(a)-4 Required Cv Energy Values for Class 1 Support Material Other Than Bolting
65	Figure NF-2331(a)-1 Required Cv Energy Values for Class 2 and MC Support Material Other Than Bolting
66	Figure NF-2331(a)-2 Required Cv Energy Values for Class 3 Support Material Other Than Bolting
67	NF-2360 Calibration of Instruments and Equipment NF-2400 Welding Material NF-2410 General Requirements NF-2420 Required Tests Table NF-2333-1 Required Cv Values for Bolting Material
68	NF-2430 Weld Metal Tests
69	Table NF-2432.1-1 Sampling of Welding Materials for Chemical Analysis
70	NF-2440 Storage and Handling of Welding Material NF-2500 Examination and Repair of Material NF-2510 Examination and Repair of Material Other Than Bolting NF-2520 Required Examination and Acceptance Standards for Class 1 Springs Table NF-2432.2(a)-1 Welding Material Chemical Analysis
71	NF-2530 Required Examination and Acceptance Standards for Coiled Wire Rope Used as a Spring NF-2580 Examination of Bolting Material and Rods Figure NF-2433.1-1 Delta Ferrite Content
72	NF-2600 Material Manufacturer’s Quality System Programs NF-2610 Documentation and Maintenance of Quality System Programs
73	Article NF-3000 Design NF-3100 General Design Requirements NF-3110 Loading Criteria
74	NF-3120 Design Considerations
75	NF-3130 General Design Requirements
76	Table NF-3131(a)-1 Reference Paragraphs for Procedures for Design of Component Supports, Piping Supports, and Standard Supports
77	NF-3140 General Design Procedures NF-3200 Design Rules for Plate- and Shell-Type Supports NF-3210 General Requirements
78	NF-3220 Design by Analysis for Class 1
79	Table NF-3221.2-1 Elastic Analysis Stress Categories and Stress Limit Factors for Class 1 Plate‐ and Shell‐Type Supports Designed by Analysis
82	Table NF-3223.5-1 Values of K for Various Boundary Conditions and a/b Ratios
84	NF-3250 Design by Analysis for Class 2 and MC Table NF-3225.2-1 Stress Limit Factors for Class 1, 2, 3, and MC Bolt Design by Analysis
85	Figure NF-3226.1-1 Permissible Welded Joints for Class 1 Plate‐ and Shell‐Type Supports
86	Figure NF-3226.1(a)-1 Typical Weld Details Referenced
87	Figure NF-3226.1(a)-2 Butt Welding of Plates of Unequal Thickness
88	Table NF-3251.2-1 Elastic Analysis Stress Categories and Stress Limit Factors for Class 2, 3, and MC Plate‐ and Shell‐Type Supports Designed by Analysis
89	NF-3260 Design by Analysis for Class 3
90	Figure NF-3256.1-1 Permissible Welded Joints for Class 2, 3, and MC Plate‐ and Shell‐Type Supports
91	NF-3270 Experimental Stress Analysis NF-3280 Design by Load Rating
92	NF-3300 Design Rules for Linear-Type Supports NF-3310 General Requirements
94	Table NF-3312.1(b)-1 Elastic Analysis Stress Categories and Stress Limit Factors for Class 1, 2, 3, and MC Linear-Type Supports Designed by Analysis
96	NF-3320 Design by Linear Elastic Analysis for Class 1
104	Table NF-3322.2(e)(2)-1 Limiting Proportions for Channels and Tees
112	Figure NF-3322.8-1 Dimensional Requirements for Eyebars
113	Figure NF-3322.8-2 Dimensional Requirements for Pin‐Connected Plates
114	Figure NF-3324.1(a)(1) Typical Friction‐Type Connections Using High-Strength Bolts
116	Table NF-3324.5(a)-1 Allowable Stress Limits for Class 1 Linear‐Type Support Welds
119	NF-3330 High Cycle Fatigue Design for Class 1 Table NF-3324.6(a)(4)-1 Effective Slip Coefficient Versus Surface Condition
120	NF-3340 Limit Analysis Design for Class 1 Table NF-3324.6(b)(1)-1 Minimum Edge Distances From Center of Standard Hole Table NF-3332.2-1 Classification of Loading Conditions
121	Table NF-3332.3-1 Stress Categories
124	Figure NF-3332.3-1 Illustrative Examples
126	Table NF-3332.4-1 Allowable Stress Ranges
129	NF-3350 Design by Analysis for Class 2 and MC NF-3360 Design by Analysis for Class 3 NF-3370 Experimental Stress Analysis NF-3380 Design by Load Rating
130	NF-3400 Design Rules for Standard Supports NF-3410 General Requirements
132	NF-3420 Design by Analysis for Class 1 Figure NF-3426.1-1 Additional Permissible Welded Joints for Class 1 Standard Supports
133	NF-3450 Design by Analysis for Class 2 NF-3460 Design by Analysis for Class 3 NF-3470 Design by Experimental Stress Analysis NF-3480 Procedure for Load Rating NF-3500 Design Rules for Component Supports NF-3510 General Requirements NF-3520 Design by Analysis for Class 1
134	NF-3550 Design by Analysis for Class 2, 3, and MC NF-3570 Experimental Stress Analysis NF-3580 Design by Load Rating NF-3600 Design Rules for Piping Supports NF-3610 General Requirements
135	NF-3620 Design by Analysis for Class 1 Table NF-3611-1 Suggested Piping Support Spacing
136	NF-3650 Design by Analysis for Class 2 and 3 NF-3670 Experimental Stress Analysis NF-3680 Design by Load Rating Figure NF-3626(a)-1 Additional Permissible Welded Joints for Class 1 Piping
137	Article NF-4000 Fabrication and Installation NF-4100 General Requirements NF-4110 Introduction NF-4120 Certification of Materials and Fabrication by Support Certificate Holder NF-4130 Repair of Material
138	NF-4200 Forming, Fitting, and Aligning NF-4210 Cutting, Forming, and Bending
139	NF-4220 Support Tolerances NF-4230 Fitting and Aligning
140	NF-4240 Requirements for Welded Joints NF-4300 Welding Qualifications NF-4310 General Requirements NF-4320 Welding Qualifications and Records Table NF-4232-1 Maximum Allowable Offset in Final Butt-Welded Joints
141	NF-4330 General Requirements for Welding Procedure Qualification Tests
143	NF-4400 Rules Governing Making and Repairing Welds NF-4410 Precautions to Be Taken Before Welding
144	NF-4420 Rules for Making Welded Joints NF-4430 Welding of Attachments NF-4440 Special Requirements for Welding
145	Figure NF-4427-1 Fillet Weld Dimensions
146	NF-4450 Repair of Weld Metal Defects Figure NF-4441-1 Weld Joint Producing Through‐Thickness Loading
147	NF-4500 Brazing NF-4510 Rules for Brazing NF-4600 Heat Treatment NF-4610 Welding Preheat and Interpass Requirements
148	NF-4620 Postweld Heat Treatment
149	Table NF-4622.1-1 Mandatory Requirements for Postweld Heat Treatment (PWHT) of Welds
150	NF-4660 Heat Treatment of Electroslag Welds Table NF-4622.4(c)-1 Alternative Holding Temperatures and Times
151	Table NF-4622.7(b)-1 Exemptions to Mandatory PWHT
152	Table NF-4622.7(b)-2 Additional Exemptions to Mandatory PWHT
153	NF-4700 Requirements for Bolted Construction NF-4710 Bolting and Threading NF-4720 Bolting Table NF-4721(a)-1 Bolt Hole Sizes Table NF-4721(b)-1 Tolerances on Oversized Holes
155	Article NF-5000 Examination NF-5100 General Requirements for Examination NF-5110 Procedures, Qualifications, and Evaluations NF-5120 Time of Examination of Welds NF-5200 Required Examination of Welds NF-5210 Examination of Class 1 Support Welds
156	NF-5220 Examination of Class 2 and MC Support Welds NF-5230 Examination of Class 3 Support Welds
157	NF-5240 Inertia and Continuous Drive Friction Welds NF-5300 Acceptance Standards NF-5320 Radiographic Acceptance Standards NF-5330 Ultrasonic Acceptance Standards NF-5340 Magnetic Particle Acceptance Standards
158	NF-5350 Liquid Penetrant Acceptance Standards NF-5360 Visual Acceptance Standards
159	NF-5500 Qualifications and Certification of Nondestructive Examination Personnel NF-5510 General Requirements NF-5520 Personnel Qualification, Certification, and Verification
160	NF-5530 Records
161	Article NF-8000 Certificates of Authorization and Certification Documents NF-8100 General Requirements
162	MANDATORY APPENDIX NF-I ADDITIONAL MATERIAL FOR SUPPORTS ARTICLE NF-I-1000 Introduction NF-I-1100 Scope NF-I-1200 General Requirements
163	ARTICLE NF-I-2000 Materials NF-I-2100 General NF-I-2200 Requirements NF-I-2210 NF-I-2220 NF-I-2230 NF-I-2240
164	Table NF-I-2100-1 Design Stress Intensity (Sm), Maximum Allowable Stress (S), Yield Strength (Sy), and Tensile Strength (Su) Values
190	Table NF-I-2100-1 MDesign Stress Intensity (Sm), Maximum Allowable Stress (S), Yield Strength (Sy), and Tensile Strength (Su) Values
209	Table NF-I-2100-2 ASTM Specifications
210	ARTICLE NF-I-3000 Welding NF-I-3100 General NF-I-3110 NF-I-3200 Welding Qualifications NF-I-3210 NF-I-3220 NF-I-3300 Additional Requirements NF-I-3310 NF-I-3320 NF-I-3330 NF-I-3340 NF-I-3400 Requirements for S-Number Materials NF-I-3410 NF-I-3500 Specific Requirements for S-Number 12 Group Number 1 Materials NF-I-3510 Preheat NF-I-3520 Postweld Heat Treatment
211	NF-I-3530 Impact Test Requirements
212	MANDATORY APPENDIX NF-II DESIGN OF SINGLE ANGLE MEMBERS ARTICLE NF-II-1000 Introduction NF-II-1100 Scope NF-II-1200 General Requirements
213	ARTICLE NF-II-2000 Nomenclature
214	ARTICLE NF-II-3000 Design Requirements NF-II-3100 General NF-II-3200 Tension NF-II-3300 Shear NF-II-3400 Compression
215	NF-II-3500 Flexure NF-II-3510 Allowable Bending Stress
216	NF-II-3520 Bending About Geometric Axes Figure NF-II-3510 Equal Leg Single Angle Limits for Fb = 0.66Sy (Reprinted With Permission of AISC)
217	NF-II-3530 Bending About Principal Axes NF-II-3600 Combined Stresses NF-II-3610 Axial Compression and Flexure Table NF-II-3532-1 Bw Values for Angles
218	NF-II-3620 Axial Tension and Bending
219	MANDATORY APPENDIX NF-III ENERGY-ABSORBING SUPPORT MATERIAL ARTICLE NF-III-1000 General Requirements
220	ARTICLE NF-III-2000 Material Requirements
221	ARTICLE NF-III-3000 Design
222	ARTICLE NF-III-4000 Fabrication
223	NONMANDATORY APPENDIX NF-A STRUCTURAL BOLT PRELOADING ARTICLE NF-A-1000 INTRODUCTION NF-A-1100 Scope NF-A-1200 Discussion
224	NF-A-1300 Bolt Tightening (Preload Methods) NF-A-1310 Torque Wrenches Figure NF-A-1311
225	NF-A-1320 Turn-of-the-Nut NF-A-1330 Load-Indicating Washers
226	NF-A-1340 Strain Gages NF-A-1350 Fastener Elongation/Extension
227	NONMANDATORY APPENDIX NF-B DESIGN ALLOWABLE STRESSES FOR PLATE AND SHELL AND LINEAR-TYPE SUPPORTS ARTICLE NF-B-1000 INTRODUCTION NF-B-1100 Objective NF-B-1200 Scope
228	ARTICLE NF-B-2000 Linear Supports — Method for Establishing Allowable Stresses NF-B-2100 Responsibility for Assigning Yield and Ultimate Strength Values NF-B-2200 Tension Member Allowable Stress NF-B-2300 Beam Bending Allowable Stress NF-B-2400 Compression Member Allowable Stress
229	NF-B-2500 Beam-Column Allowable Stress Figure NF-B-2400-1 Effective Length Factor for Various End Conditions
230	Figure NF-B-2400-2 Alignment Chart for Effective Length of columns in Continuous Frames
231	NF-B-2600 Bolting Allowable Stress
232	ARTICLE NF-B-3000 Plate and Shell Supports — Allowable Stresses
233	ARTICLE NF-B-4000 Materials With Low Ratios of Tensile to Yield Strength Table NF-B-4000 Factors of Safety for a Material With a Low Value of Su/Sy Ratio
234	ARTICLE NF-B-5000 Special Consideration NF-B-5100 Copper-Based Alloys NF-B-5200 Stainless Steel NF-B-5300 Nonductile Behavior and Stress Corrosion Cracking
235	NONMANDATORY APPENDIX NF-C DESIGN BASIS FOR LINEAR-TYPE SUPPORTS ARTICLE NF-C-1000 Introduction NF-C-1100 Objective NF-C-1200 Scope
236	ARTICLE NF-C-2000 Material Availability and Requirements Differences
237	ARTICLE NF-C-3000 AISC Paragraph Selections
238	ARTICLE NF-C-4000 Cross-Reference to AISC
239	Table NF-C-4000 Design Basis for Linear‐Type Supports
241	NONMANDATORY APPENDIX NF-D TOLERANCES ARTICLE NF-D-1000 Introduction NF-D-1100 Objective NF-D-1200 Scope NF-D-1300 General Requirements NF-D-1310 Material NF-D-1320 Fabrication Tolerances Table NF-D-1320-1 Clamp Tolerances
242	NF-D-1330 Installation Tolerances
243	Table NF-D-1330-1 Local Installation Tolerances for Supports
247	NONMANDATORY APPENDIX NF-E DAMPERS, ENERGY ABSORBERS, AND SNUBBERS ARTICLE NF-E-1000 NF-E-1100 Scope and Definitions NF-E-1110 Scope NF-E-1120 Definitions NF-E-1200 Dampers NF-E-1210 Description NF-E-1220 Function NF-E-1230 Applications NF-E-1240 Modeling NF-E-1300 Energy Absorbers NF-E-1310 Description
248	NF-E-1320 Function NF-E-1330 Applications NF-E-1340 Modeling NF-E-1400 Snubbers NF-E-1410 Description NF-E-1420 Function NF-E-1430 Applications NF-E-1440 Modeling
249	ENDNOTES

Published By	Publication Date	Number of Pages
ASME	2021


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

ASME BPVC III 1 NF 2021

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