Document: NRC Regulatory Guide
Document ID: c458fb43-5ee6-4e14-a33d-808ec974115a
Document Type: regulatory_guide
Title: Instrument Lines Penetrating Primary Reactor Containment + HISTORY - HISTORY 09/2009 – DG-1225 , Proposed Revision 1 Prior to the issuance of Revision 1, RG 1.11 was entitled "Instrument Lines Penetrating Primary Reactor Containment (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0909/ML090970530.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.11
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CFR Title: 

Content:
ernative Approaches The NRC staff considered the following alternative approaches: Do not revise Regulatory Guide 1.11. Revise Regulatory Guide 1.11. Alternative 1: Do Not Revise Regulatory Guide 1.11 Under this alternative, the NRC would not revise this guide, and the current guidance would be retained. If the NRC does not take action, there would not be any changes in costs or benefit to the public, licensees, or the NRC. However, the “no-action” alternative would allow outdated and no longer applicable information to remain with the current version of the regulatory guide. Alternative 2: Revise Regulatory Guide 1.11 Under this alternative, the NRC would revise Regulatory Guide 1.11, taking into consideration the efficiency improvement of providing guidance in a format consistent with that of other more recently issued regulatory guides and without the obsolete February 17, 1972 supplement to Safety Guide 11 (Ref 5) which describes possible backfitting considerations. The benefit of this action is that an updated Regulatory Guide 1.11 provides licensees with the current staff positions on acceptable designs they may use to implement the intent of GDC 55 and 56 of Appendix A to 10 CFR Part 50 for the isolation of instrument lines that penetrate the primary containment of light-water-cooled reactors. The impact to the NRC would be the costs associated with preparing and issuing the regulatory guide revision. The impact to the public would be the voluntary costs associated with reviewing and providing comments to the NRC during the public comment period. The additional impact on licensees and applicants is expected to be negligible. The value to the NRC staff, its licensees and its license and certification applicants would be the benefits associated with enhanced efficiency and effectiveness in using a common guidance document as the technical basis for license and design certification applications and other interactions between the NRC and its regulated