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The NRC is issuing for public comment a draft guide in the NRC's “Regulatory Guide” series. This series was developed to describe and make available to the public such information as methods that are acceptable to the NRC staff for implementing specific parts of the NRC's regulations, techniques that the staff uses in evaluating specific problems or postulated accidents, and data that the staff needs in its review of applications for permits and licenses.
The draft regulatory guide, entitled, “Control of Ferrite Content in Stainless Steel Weld Metal,” is temporarily identified by its task number, DG-1279. The DG-1279 is proposed revision 4 of Regulatory Guide 1.31, dated April 1978. Revision 4 updates the guide to remove references to outdated standards and to remove an appendix that has been incorporated into relevant specifications.
This guide describes a method that the staff of the U.S. Nuclear Regulatory Commission (NRC) considers acceptable for controlling ferrite content in stainless steel weld metal. This guide is intended to supplement the ASME Code requirements to ensure control of delta ferrite in welds in austenitic stainless steel core support structures, reactor internals, and Class 1, 2, and 3 components. The NRC staff seeking input on the latest technical standards that should be in this guide.
For the Nuclear Regulatory Commission.