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:
t 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 N-71-21, the evidence presented to and accepted by the Authorized Inspector concerning exposure of electrodes for a longer period of time must be consistent with Paragraph 5.3.2.3, “Alternative Atmosphere Exposure Time Periods Established by Test,” of the AWS D1.1 Code. (3) Paragraph 16.2.2 of Code Case N-71-21 is replaced with the following: “When not exempted by 16.2.1 above, the post weld 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) 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 Pnumber materials listed in the Code Case, the corresponding Snumber welding requirements apply. 0/21E DG-1405, Page 14 CODE CASE NUMBER TABLE 2 CONDITIONALLY ACCEPTABLE SECTION III CODE CASES TITLE/CONDITION DATE OR SUPPLEMENT/ EDITION N-155-3 Fiberglass Reinforced Thermosetting Resin Pipe, Section III, Division 1 (1) The design temperature for spray pond piping must be 100°C (212°F). (2) The allowable design stress must be the value obtained from the minimum hydrostatic design basis in Table 3611-1 of Code Case N-155-2 (Procedure A or B) or the value determined as one-sixth of the stress obtained from a short-time burst test for the pipe being qualified, whichever is lower. The short-time burst