[Federal Register Volume 69, Number 242 (Friday, December 17, 2004)]
[Notices]
[Pages 75570-75571]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 04-27613]


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NUCLEAR REGULATORY COMMISSION


Notice of Availability and Draft Report for Comment, ``Evaluation 
of Loss of Offsite Power Events at Nuclear Power Plants: 1986-2003''

AGENCY: Nuclear Regulatory Commission (NRC).

ACTION: Notice of availability of the Office of Nuclear Regulatory 
Research draft report entitled, ``Evaluation of Loss of Offsite Power 
Events at Nuclear Power Plants: 1986-2003,'' and request for public 
comment.

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SUMMARY: The Nuclear Regulatory Commission (NRC) is announcing the 
availability of the Office of Nuclear Regulatory Research draft report 
entitled, ``Evaluation of Loss of Offsite Power Events at Nuclear Power 
Plants: 1986-2003.''

DATES: Comments on this document should be submitted by January 31, 
2005. Comments received after that date will be considered to the 
extent practicable. To ensure efficient and complete comment 
resolution, comments should include references to the section, page, 
and line numbers of the document to which the comment applies, if 
possible.

ADDRESSES: Members of the public are invited and encouraged to submit 
written comments to Michael Lesar, Chief Rules and Directives Branch, 
Office of Administration, Mail Stop T-6D59, U.S. Nuclear Regulatory 
Commission, Washington, DC 20555-0001. Hand-deliver comments attention 
to Michael Lesar, 11545 Rockville Pike, Rockville, Maryland, between 
7:30 a.m. and 4:15 p.m. on Federal workdays. Comments may also be sent 
electronically <a href="/cdn-cgi/l/email-protection#da948899889f8a9ab4a8b9f4bdb5ac"><span class="__cf_email__" data-cfemail="7a342839283f2a3a140819541d150c">[email protected]</span></a>.
    This document is available at the Agencywide Documents Access and 
Management System (ADAMS) Public Electronic Reading Room on the 
Internet at the NRC Web site at http://www.nrc.gov/reading-rm/adams.html under Accession No. ML043380322, and at the NRC Public 
Document Room, 11555 Rockville Pike, Rockville, MD. Please note that on 
October 25, 2004, the NRC terminated public access to ADAMS and 
initiated an additional security review of publicly available documents 
to ensure that potentially sensitive information is removed from the 
ADAMS database accessible through the NRC's Web site. Interested 
members of the public may obtain copies of the referenced documents for 
review and/or copying by contacting the Public Document Room pending 
resumption of public access to ADAMS. The NRC Public Documents Room is 
located at NRC Headquarters in Rockville, MD, and can be contacted at 
(800) 397-4209, (301) 415-4737 or by e-mail to <a href="/cdn-cgi/l/email-protection#09796d7b49677b6a276e667f"><span class="__cf_email__" data-cfemail="275743556749554409404851">[email protected]</span></a>.

FOR FURTHER INFORMATION CONTACT: Dale Rasmuson, Operating Experience 
Risk Analysis Branch, Office of Nuclear Regulatory Research, telephone 
(301) 415-7571, e-mail <a href="/cdn-cgi/l/email-protection#26424b546648544508414950"><span class="__cf_email__" data-cfemail="1a7e77685a746879347d756c">[email protected]</span></a>.

SUPPLEMENTARY INFORMATION:

Draft Report Entitled, ``Evaluation of Loss of Offsite Power Events at 
Nuclear Power Plants: 1986-2003''

    This report is an update of two previous reports analyzing loss of 
offsite power (LOOP) events at U.S. commercial nuclear power plants. 
LOOP data over the period 1986-2003 were collected and analyzed. 
Frequency and duration estimates for critical and shutdown operations 
were generated for five categories of LOOPs: plant centered, switchyard 
centered, grid related, severe weather related, and extreme weather 
related. Overall, LOOP frequencies during critical operation have 
decreased significantly in recent years, while LOOP durations have 
increased. Various additional topics of interest were also addressed. 
These topics include potential effects of deregulation, seasonal 
impacts on LOOP frequencies, consequential LOOPs and others. Finally, 
additional engineering analyses of the LOOP data were presented. This 
information is needed in probabilistic risk assessment models of U.S. 
commercial nuclear power plants to accurately model current risk from 
LOOP and associated station blackout scenarios.
    The NRC is seeking public comment in order to receive feedback from 
the widest range of parties and to ensure that all information relevant 
to developing this document is available to the NRC staff. This 
document is issued for comment only and is not intended for interim 
use. The NRC will review

[[Page 75571]]

public comments received on the document, incorporate suggested changes 
as necessary, and issue the final report for use.

    Dated at Rockville, Maryland, this 13th day of December, 2004.

    For the Nuclear Regulatory Commission.
Charles E. Ader,
Director, Division of Risk Analysis and Applications, Office of Nuclear 
Regulatory Research.
[FR Doc. 04-27613 Filed 12-16-04; 8:45 am]
BILLING CODE 7590-01-P


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