Document: NRC Regulatory Guide
Document ID: 3b2db8ce-390c-4489-92fa-93da21fdd0fa
Document Type: regulatory_guide
Title: Station Blackout + HISTORY –HISTORY 09/2015 – Periodic Review of Revision 0 – Reviewed with issues identified for future consideration Revision 0, issued June 1988, and reissued August 1988 with corrected tables 03/1986 – Draft SI 501-4, Proposed Revision 0
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1527/ML15272A242.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.155
CFR Part: 
CFR Title: 

Content:
Regulatory Guide Periodic Review NOTE: This review was conducted in Sept 2015 and reflects the staff’s plans as of that date. These plans are tentative and are subject to change. Regulatory Guide Number: 1.155 Revision number: 0 Title: Station Blackout Office/division/branch: RES/DE/ICEEB Technical Lead: Kenn Miller Staff Action Decided: Reviewed with issues identified for future consideration 1. What are the known technical or regulatory issues with the current version of the Regulatory Guide (RG)? The current version of RG 1.155 generally references IEEE Std. 765-1983 (765-2012 current version) “Preferred Power Supply (PPS) for Nuclear Power Generating Stations (NPGS)” Section 5.1.3 on Independence. The discussion of Independence in 765-2012 is the same as in 765-1983 so the RG 1.155 reference to 765-1983 presents no technical or regulatory issues. In addition, RG 1.155 also generally references IEEE Std. 387-1984 (387-1995 current version) “IEEE Standard Criteria for Diesel-Generator Units Applied as Standby Power Supplies for Nuclear Power Generating Stations” for AC power system power reliability and its vulnerability to common cause failures. While 387-1995 provided additional detail on qualification, testing and reliability with respect to 387-1984, a new revision is in process with IEEE and should be going to ballot in the next six months. Therefore, since the reference in RG 1.155 to IEEE Std. 387 is in general terms and since a new version of IEEE Std. 387 is soon to be issued, a revision to RG 1.155 should be deferred until the new IEEE Std. 387 is issued. 2. What is the impact on internal and external stakeholders of not updating the RG for the known issues, in terms of anticipated numbers of licensing and inspection activities over the next several years? Use of the current version of RG 1.155 will have no known impact on internal or external stakeholders at this time. 3. What is an estimate of the level of effort (LOE) needed to address