Document: NRC Regulatory Guide
Document ID: 1bd47be4-b79c-4108-b744-3e7d400266e8
Document Type: regulatory_guide
Title: ASME Code Cases Approved for Use Without Conditions (Rev. 0)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2509/ML25091A013.pdf
Revision Date: 2025-09
Chapter: 
Section ID: RG-1.262
CFR Part: 
CFR Title: 

Content:
by Surface Stress Improvement 0/2023E N-933 Materials Exempted from Stress-Rupture Test 2/2023E Table 1. Acceptable Section III Code Cases RG 1.262, Page 8 2. Acceptable Section XI Code Cases The NRC determined that the Section XI code cases listed in table 2 are acceptable for use by licensees in their Section XI ISI programs. To assist users, new or newly revised code cases are shaded in grey to distinguish them from those listed in previous versions of this guide. Users should be aware that a code case approved in this RG may be a more recent version of a code case previously approved in RG 1.147. Licensees are required to follow 10 CFR 50.55a(b)(5) when applying ASME BPV Section XI code cases. The third column of table 2 lists the supplement and edition in which each code case was published (e.g., “5/2017E” means Supplement 5 to the 2017 Edition of the ASME BPV Code). The NRC will update this table in the future as additional code cases are determined to be appropriate for this RG. Table 2. Acceptable Section XI Code Cases CODE CASE NUMBER TITLE SUPPLEMENT/ EDITION N-513-6 Evaluation Criteria for Temporary Acceptance of Flaws in Moderate Energy Class 2 or 3 Piping and Gate Valves 4/2021E N-516-6 Underwater Welding 1/2023E N-532-6 Repair/Replacement Activity Documentation Requirements and Inservice Inspection Summary Report Preparation and Submission 0/2023E N-639-1 Alternative Calibration Block Material 3/2021E N-786-5 Alternative Requirements for Sleeve Reinforcement of Class 2 and 3 Moderate-Energy Carbon Steel Piping 1/2023E N-788-2 Certification of Ultrasonic Examination Personnel by Third Party NDE Certification Organizations 5/2023E N-809-2 Reference Fatigue Crack Growth Rate Curves for Austenitic Stainless Steels in Pressurized Water Reactor Environments 1/2023E N-888-2 Similar and Dissimilar Metal Welding Using Ambient Temperature SMAW or Machine GTAW Temper Bead Technique 3/2023E N-892-1 Alternative Requirement for Form OAR-1, Owner’s Activity