Document: NRC Regulatory Guide
Document ID: 1d715751-9321-4481-a46f-4ff802a5efe0
Document Type: regulatory_guide
Title: Service Limits and Loading Combinations for Class 1 Linear-Type Supports + HISTORY – HISTORY 10/2006 – DG-1168 , Proposed Revision 2
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0630/ML063000449.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.124
CFR Part: 
CFR Title: 

Content:
and Loading Combinations for Class 1 Linear-Type Component Supports,” in January 1978 to document service limits and loading combinations for the design of Class 1 linear-type component supports in accordance with the requirements of Section III, Division I, Subsection NF of the ASME Boiler and Pressure Vessel Code, 1974 Edition, including the 1976 Winter Addenda. The NRC staff updated draft Revision 2 of the regulatory guide to incorporate the revisions documented in the 2001 Edition through the 2003 Addenda of the ASME Code, as permitted by 10 CFR 50.55a(b)(1), revised on January 1, 2006. The staff also revised the draft revision of the regulatory guide to delete guidance supplanted by current Code requirements. 2. Objective This regulatory action updates the NRC’s guidance with respect to the design of Class 1 linear-type component supports. The revised regulatory guide will continue to provide guidance to applicants and licensees on the acceptable levels of service limits and appropriate loading combinations for the design of Class 1 linear-type component supports. Use of the regulatory guide as an adjunct to the ASME Code requirements will give applicants and licensees additional assurance that the design of Class 1 linear-type component supports is being implemented conservatively. 3. Alternative Approaches The NRC staff considered the following alternative approaches to the problem of outdated guidance regarding the design of Class 1 linear-type component supports: (1) Do not revise Regulatory Guide 1.124. (2) Update Regulatory Guide 1.124. 3.1 Alternative 1: Do Not Revise Regulatory Guide 1.124 Under this alternative, the NRC would not revise this guidance, and licensees would continue to use the original version of this regulatory guide. This alternative is considered the baseline or “no action” alternative and, as such, involves no value/impact considerations. 3.2 Alternative 2: Update Regulatory Guide 1.124 Under this alternative, the NRC would