[Federal Register Volume 70, Number 38 (Monday, February 28, 2005)]
[Notices]
[Page 9682]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 05-3736]


-----------------------------------------------------------------------

NUCLEAR REGULATORY COMMISSION


Availability of the Office of Nuclear Regulatory Research Draft 
Report Entitled, ``Station Blackout Risk Evaluation for Nuclear Power 
Plants,'' for Comment

AGENCY: Nuclear Regulatory Commission.

ACTION: Notice of availability of the Office of Nuclear Regulatory 
Research draft report entitled, ``Station Blackout Risk Evaluation for 
Nuclear Power Plants,'' and request for public comment.

-----------------------------------------------------------------------

SUMMARY: The Nuclear Regulatory Commission (NRC) is announcing the 
availability of the Office of Nuclear Regulatory Research draft report 
entitled, ``Station Blackout Risk Evaluation for Nuclear Power 
Plants.''

DATES: Comments on this document should be submitted by April 15, 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, MD, between 7:30 
a.m. and 4:15 p.m. on Federal workdays. Comments may also be sent 
electronically to: [email protected].
    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. ML050140399, and at the NRC Public 
Document Room, 11555 Rockville Pike, Rockville, MD. The PDR's mailing 
address is USNRC PDR, Washington, DC 20555; telephone (301) 415-4737 or 
(800) 397-4205; fax (301) 415-3548; e-mail [email protected].

FOR FURTHER INFORMATION CONTACT: Dale M. Rasmuson, Division of Risk 
Analysis and Applications, Office of Nuclear Regulatory Research, U.S. 
Nuclear Regulatory Commission, Washington, DC 20555-0001. Telephone: 
301-415-7571, e-mail: [email protected].

SUPPLEMENTARY INFORMATION:

Draft Report Entitled, ``Station Blackout Risk Evaluation for Nuclear 
Power Plants''

    This report is an update of several previous reports analyzing the 
risk from loss of offsite power and subsequent station blackout events 
at U.S. commercial nuclear power plants. The risk measure used is core 
damage frequency. Standardized plant analysis risk (SPAR) models 
developed by the U.S. Nuclear Regulatory Commission, covering the 103 
operating commercial nuclear power plants, were used to evaluate the 
risk. Core damage frequency results indicating contributions from 
station blackout scenarios and other loss of offsite power scenarios 
are presented for each of the 103 plants, along with plant class and 
industry averages. In addition, a comprehensive review of emergency 
diesel generator performance was performed to obtain current estimates 
for input to the SPAR models. Overall results indicate that core damage 
frequencies for loss of offsite power and station blackout are lower 
than previous estimates. Contributing to this risk reduction is an 
improvement in emergency diesel generator performance.
    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 public comments received on the document, 
incorporate suggested changes as necessary, and issue the final report 
for use. The NRC will review public comments received on the document, 
incorporate suggested changes as necessary, and issue the final report 
for use.

    Dated at Rockville, Maryland, this 16th day of February, 2005.
    For the Nuclear Regulatory Commission.
Charles E. Ader,
Director, Division of Risk Analysis and Applications, Office of Nuclear 
Regulatory Research.
[FR Doc. 05-3736 Filed 2-25-05; 8:45 am]
BILLING CODE 7590-01-P