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:
has essentially no residual stresses or assembly stresses and it does not experience frequent sustained loads in service. (3) In the last sentence of Paragraph 5.3 of the Code Case, reference must be made to Paragraph 5.3.2.3, “Alternative Atmosphere Exposure Time Periods Established by Tests,” of the AWS D1.1 Code for the evidence presented to and accepted by the authorized inspector concerning exposure of electrodes for longer periods of time. (4) Paragraph 15.2.2 of the Code Case is not acceptable as written and must be replaced with the following: “When not exempted by 15.2.1 above, the postweld heat treatment must be performed in accordance with NF-4622 except that ASTM A-710 Grade A Material must be at least 1000°F (540°C) 12/5/85 12/16/86 2/12/93 12/31/96 12/8/00 11/8/12 DG-1405, Page 41 CODE CASE NUMBER TABLE 5 CODE CASES THAT HAVE BEEN SUPERSEDED BY REVISED CODE CASES ON OR AFTER JULY 1, 1974 REVISION DATE and must not exceed 1150°F (620°C) for Class 1 and Class 2 material and 1175°F (640°C) for Class 3 material.” (5) The new holding time at temperature for weld thickness (nominal) must be 30 minutes for 2 inches or less; 1 hour per inch for thickness over 2 inches to 5 inches; and for thicknesses over 5 inches, 5 hours plus 15 minutes for each additional inch over 5 inches. The fracture toughness requirements as listed in this Code Case apply only to piping supports, not to Class 1, Class 2, and Class 3 component supports. N-71-19 N-71-20 Additional Materials for Subsection NF, Classes 1, 2, 3 and MC Component Supports Fabricated by Welding, Section III, Division 1 (1) The maximum measured ultimate tensile strength (UTS) of the component support material must not exceed 170 ksi because of the susceptibility of high-strength materials 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