[Federal Register Volume 77, Number 60 (Wednesday, March 28, 2012)]
[Pages 18872-18873]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2012-7437]




Availability of Electric Power Sources

AGENCY: Nuclear Regulatory Commission.

ACTION: Regulatory guide; issuance.


SUMMARY: The U.S. Nuclear Regulatory Commission (NRC or Commission) is 
issuing Revision 1 of Regulatory Guide (RG) 1.93, ``Availability of 
Electric Power Sources.'' This guide describes actions the NRC staff 
considers acceptable when available electric power sources are less 
than the number of sources required by the limiting conditions for 
operations (LCOs) for the facility.

ADDRESSES: Please refer to Docket ID NRC-2010-0305 when contacting the 
NRC about the availability of information regarding this document. You 
may access information related to this document, which the NRC 
possesses and is publicly available using the following methods:
     Federal Rulemaking Web site: Go to http://www.regulations.gov and search for Docket ID NRC-2010-0305. Address 
questions about NRC dockets to Carol Gallagher; telephone 301-492-3668; 
email: [email protected].
     NRC's Agencywide Documents Access and Management System 
(ADAMS): Publicly available documents created or received at the NRC 
are available online in the NRC Library at http://www.nrc.gov/reading-rm/adams.html. To begin the search, select ``ADAMS Public Document'' 
and then select ``Begin Web-based ADAMS Search.'' For problems with 
ADAMS, please contact the NRC's Public Document Room (PDR) reference 
staff at 1-800-397-4209 or 301-415-4737, or by email to 
[email protected]. The ADAMS accession number for each document 
referenced in this notice (if that document is available in ADAMS) is 
provided the first time that document is referenced. Revision 1 of 
Regulatory Guide 1.93 is available electronically under ADAMS Accession 
Number ML090550661. The regulatory analysis may be found in ADAMS under 
Accession Number ML101870610. Public Comments and the NRC staff 
response to them are summarized in a table that may be found in ADAMS 
under Accession Number ML090550693.
    Regulatory guides are not copyrighted, and NRC approval is not 
required to reproduce them.
     NRC's Public Document Room (PDR): The public may examine 
and have copied, for a fee, publicly available documents at the NRC's 
PDR, O1-F21, One White Flint North, 11555 Rockville Pike, Rockville, 
Maryland 20852.

FOR FURTHER INFORMATION CONTACT: Sheila Ray, Division of Engineering, 
Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory 
Commission, Washington, DC 20555-0001, telephone: 301-251-7644; email: 
[email protected].


I. Introduction

    The NRC is issuing a revision to an existing guide in the NRC's 
``Regulatory Guide'' series. This series was developed to describe and 
make available to the public information such as methods that are 
acceptable to the

[[Page 18873]]

NRC staff for implementing specific parts of the agency'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 recommendations in this guide describe actions that the staff 
of the NRC considers acceptable when the number of available electric 
power sources are less than the number of sources required by the 
limiting conditions for operation (LCOs) for a facility. This 
regulatory guide applies to single- and multiple-unit plants and is 
consistent with the improved standard technical specifications (iSTS) 
(NUREG-1430 through NUREG-1434). The LCO-required actions and specified 
completion times referred to in this guide are based on the completion 
times presented in Regulatory Guide 1.93, Revision 0, ``Availability of 
Electric Power Sources,'' issued December 1974, which have been 
incorporated into the required actions in the iSTS.
    The recommendations described in this guide are an approach that 
the NRC staff finds acceptable for satisfying some of the requirements 
of General design criterion (GDC) 17, ``Electric Power Systems,'' of 
Appendix A, ``General Design Criteria for Nuclear Power Plants,'' to 10 
CFR part 50, ``Domestic Licensing of Production and Utilization 

II. Further Information

    Revision 1 of RG 1.93 was issued with a temporary identification as 
Draft Regulatory Guide, DG-1244. DG-1244, was published in the Federal 
Register on September 24, 2010 (75 FR 5844) for a 60 day public comment 
period. The public comment period closed on November 26, 2010. The NRC 
staff's responses to the public comments on DG-1244 are available under 
ADAMS Accession Number ML090550693.

    Dated at Rockville, Maryland, this 19th day of March, 2012.

    For the Nuclear Regulatory Commission.
Richard Jervey,
Acting Chief, Regulatory Guide Development Branch, Division of 
Engineering, Office of Nuclear Regulatory Research.
[FR Doc. 2012-7437 Filed 3-27-12; 8:45 am]