[Federal Register Volume 77, Number 35 (Wednesday, February 22, 2012)]
[Pages 10576-10577]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2012-4096]




Methodology for Low Power/Shutdown Fire PRA

AGENCY: Nuclear Regulatory Commission.

ACTION: Draft NUREG/CR; extension for public comment period.


SUMMARY: On December 29, 2011 (76 FR 81998), the U.S. Nuclear 
Regulatory Commission (NRC) published in the Federal Register a request 
for public comment on Draft NUREG/CR-7114, Revision 0, ``Methodology 
for Low Power/Shutdown Fire PRA.'' In response to request from members 
of the public, the NRC is extending the public comment period until 
April 18, 2012.

DATES: The comment period has been extended and expires on April 18, 
2012. Comments received after this date will be considered if it is 
practical to do so, but the NRC staff is able to ensure consideration 
only for comments received on or before this date.

ADDRESSES: Please include Docket ID NRC-2011-0295 in the subject line 
of your comments. For additional instructions on submitting comments 
and instructions on accessing documents related to this action, see 
``Submitting Comments and Accessing Information'' in the SUPPLEMENTARY 
INFORMATION section of this document. You may submit comments by any of 
the following methods:
     Federal Rulemaking Web site: Go to http://www.regulations.gov and search for documents filed under Docket ID NRC-
2011-0295. Address questions about NRC dockets to Carol Gallagher (301) 
492-3668; email [email protected].
     Mail comments to: Mail comments to: Cindy Bladey, Chief, 
Rules, Announcements, and Directives Branch (RADB), Office of 
Administration, Mail Stop: TWB-05-B01M, U.S. Nuclear Regulatory 
Commission, Washington, DC 20555-0001, or by fax to RADB at (301) 492-
     Fax comments to: RADB at (301) 492-3446.

FOR FURTHER INFORMATION CONTACT: Felix E. Gonzalez, Division of Risk 
Analysis, Office of Nuclear Regulatory Research, U.S. Nuclear 
Regulatory Commission, Washington, DC 20555-0001; telephone: (301) 251-
7596, email: [email protected].


Submitting Comments and Accessing Information

    Comments submitted in writing or in electronic form will be posted 
on the NRC's Web site and on the Federal rulemaking Web site, http://www.regulations.gov. Because your comments will not be edited to remove 
any identifying or contact information, the NRC cautions you against 
including any information in your submission that you do not want to be 
publicly disclosed.
    The NRC requests that any party soliciting or aggregating comments 
received from other persons for submission to the NRC inform those 
persons that the NRC will not edit their comments to remove any 
identifying or contact information, and therefore, they should not 
include any information in their comments that they do not want 
publicly disclosed.
    You can access publicly available documents related to this 
document using the following methods:
     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.
     NRC's Agency-wide Documents Access and Management System 
(ADAMS): Publicly available document created or received at the NRC are 
available online in the NRC Library at http://www.nrc.gov/reading-rm/adams.html. From this page, the public can gain entry into ADAMS, which 
provides text and image files of the NRC's public documents. If you do 
not have access to ADAMS or if there are problems in accessing the 
documents located in ADAMS, contact the NRC's PDR reference staff at 1-
(800) 397-4209, (301) 415-4737, or by email to [email protected]. 
The draft NUREG is available electronically under ADAMS Accession No. 
ML11353A377. The draft NUREG will also be accessible through the NRC's 
public site under draft NUREGs for comment.
     Federal Rulemaking Web Site: Public comments and 
supporting materials related to this notice can be found at http://www.regulations.gov by searching on Docket ID NRC-2011-0295.


    The draft NUREG presents a probabilistic risk assessment (PRA) 
method for quantitatively analyzing fire risk in commercial nuclear 
power plants during low power operation and shutdown (LPSD) conditions, 
including the determination of core damage

[[Page 10577]]

frequency (CDF) and large early release frequency (LERF). Future 
updates are expected to be made to this document as experience is 
gained with LPSD quantitative risk analyses of both internal events and 
    The NRC developed this LPSD fire quantitative risk method so 
analysts would be able to use a quantitative approach for estimating 
fire risk during LPSD conditions. While current LPSD safety analyses 
for fires performed under National Fire Protection Association Standard 
805 (NFPA 805) focus on qualitative, defense-in-depth methods, it is 
envisioned that applications in the future may evolve to a more 
quantitative method.

    Dated at Rockville, Maryland, this 14th day of February, 2012.

    For the Nuclear Regulatory Commission.
Mark H. Salley,
Chief, Fire Research Branch, Division of Risk Analysis, Office of 
Nuclear Regulatory Research.
[FR Doc. 2012-4096 Filed 2-21-12; 8:45 am]