Document: NRC Regulatory Guide
Document ID: 08cebcdf-2e81-4e08-a508-9f6b4701c0a5
Document Type: regulatory_guide
Title: Design, Fabrication, and Materials Code Case Acceptability, ASME Section III (Rev. 40)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2219/ML22195A282.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.84
CFR Part: 
CFR Title: 

Content:
to brittleness and stress-corrosion cracking. (2) In the last sentence of Paragraph 5.2 of Code Case N7119, reference must be made to Paragraph 5.3.2.3, “Alternative Atmosphere Exposure Time Periods Established by Test,” of the AWS D1.1 Code for the evidence presented to and accepted by the Authorized Inspector concerning exposure of electrodes for a longer period of time. (3) Paragraph 16.2.2 of Code Case N-71-19 is not acceptable as written and must be replaced with the following: “When not exempted by 16.2.1 above, the post weld heat treatment must be performed in accordance with NF4622 except that ASTM A-710 Grade A Material must be at least 1000°F (540°C) and must not exceed 1150°F (620°C) for Class 1 and 2 material and 1175°F (640°C) for Class 3 material.” (4) The new holding time at temperature for weld thickness (nominal) must be 30 minutes for welds 0.5 inch or less; 1 hour per inch of thickness for welds over 0.5 inch to 5 inches; and for thicknesses over 5 inches, 5 hours plus 15 minutes for each additional inch over 5 inches. (5) The fracture toughness requirements as listed in this Code Case apply only to piping supports and not to Class 1, 2 and 3 component supports. (6) When welding P-number materials listed in the Code Case, the corresponding S-number welding requirements shall apply. 6/30/16 1/11/21 N-95-1 (1701-1) Determination of Capacities of Vacuum Relief Valves, Section III, Division 1 and 2, Class MC 7/9/79 N-102-1 (1714-2) Postweld Heat Treatment of P-1 Material, Section III, Class MC 8/28/78 N-119-2 (1739-2) N-119-3 (1739-3 N-119-4 (1739-4) N-119-5 Pump Internal Items, Section III, Division 1, Class 1, 2, and 3 8/25/80 12/1/80 7/18/85 9/5/85 N-122 Stress Indices for Structural Attachments, Class 1, Section III, Division 1 7/24/89 N-133 (1761-1) Use of SB-148 Alloy CA954 for Section III, Division 1, Class 2 or 3 Flanged End Valves 1/14/77 N-133-1 N-133-2 Use of SB-148 Alloys 952 and 954, Section III, Division 1, Class 3 5/19/85