Document: NRC Regulatory Guide
Document ID: c6e354c2-cc83-4d3d-b01b-b43865ccdac6
Document Type: regulatory_guide
Title: Control of Ferrite Content in Stainless Steel Weld Metal + HISTORY - HISTORY DG-1279 , Proposed Revision 4, published 09/2012 (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1202/ML12024A004.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.31
CFR Part: 
CFR Title: 

Content:
and 3 components. The staff concludes that ferrite content in the weld filler metal, as depicted by a ferrite number, should be between 5 and 20. This lower limit provides sufficient ferrite to avoid microfissuring in welds, whereas the upper limit provides a ferrite content adequate to offset dilution and reduce thermal aging effects. This regulatory guide endorses the use of one or more voluntary consensus codes or standards developed by external organizations. These codes or standards may contain references to other codes or DG-1279, Page 3 standards. These references should be considered individually. If a referenced standard has been incorporated separately into NRC regulations, licensees and applicants must comply with that standard as set forth in the regulation. If the referenced standard has been endorsed in a regulatory guide, the standard constitutes a method acceptable to the NRC staff for meeting a regulatory requirement as described in the specific regulatory guide. If a referenced standard has been neither incorporated into NRC regulations nor endorsed in a regulatory guide, licensees and applicants may consider and use the information in the referenced standard, if appropriately justified and consistent with current regulatory practice. The NRC has an interest in facilitating the harmonization of standards used domestically and internationally. This regulatory guide endorses standards from the American Welding Society (AWS) and the American Society of Mechanical Engineers (ASME), which are international standards organizations that develop and publish voluntary consensus technical standards for a wide range of materials, products, systems, and services. C. STAFF REGULATORY GUIDANCE 1. Verification of Delta Ferrite Content of Filler Materials Prior to production usage, the delta ferrite content of test weld deposits from each lot and each heat of weld filler metal procured for the welding of austenitic stainless steel core support structures, reactor