[Federal Register Volume 76, Number 96 (Wednesday, May 18, 2011)]
[Notices]
[Pages 28819-28820]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2011-12200]


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NUCLEAR REGULATORY COMMISSION

[NRC-2011-0109]


NUREG/CR-XXXX, Development of Quantitative Software Reliability 
Models for Digital Protection Systems of Nuclear Power Plants Draft 
Report for Comment

AGENCY: Nuclear Regulatory Commission.

ACTION: Announcement of issuance for public comment, availability.

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SUMMARY: The Nuclear Regulatory Commission has issued for public 
comment a document entitled: NUREG/CR-XXXX, ``Development of 
Quantitative Software Reliability Models for Digital Protection Systems 
of Nuclear Power Plants, Draft Report for Comment.''

DATES: Please submit comments by July 18, 2011. 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-2011-0109 in the subject line 
of your comments. Comments submitted in writing or in electronic form 
will be posted on the NRC 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 may submit

[[Page 28820]]

comments by any one of the following methods:
     Federal Rulemaking Web Site: Go to http://www.regulations.gov and search for documents filed under Docket ID NRC-
2011-0109. Address questions about NRC dockets to Carol Gallagher, 
telephone: 301-492-3668; e-mail: [email protected].
     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.
     Fax comments to: RADB at 301-492-3446.
    You can access publicly available documents related to this notice 
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 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. 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 e-mail to [email protected]. 
NUREG/CR-XXXX is available electronically under ADAMS Accession Number 
ML111020087.
     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-2011-0109.

FOR FURTHER INFORMATION CONTACT: Alan Kuritzky, Division of Risk 
Analysis, Office of Nuclear Regulatory Research, U.S. Nuclear 
Regulatory Commission, Washington, DC 20555-0001. Telephone: 301-251-
7587, e-mail: [email protected].

SUPPLEMENTARY INFORMATION: The NRC is conducting research to support 
development of regulatory guidance for using risk information related 
to digital systems in the licensing actions of nuclear power plants 
(NPPs). The objective of this research is to identify and develop 
methods, analytical tools, and regulatory guidance for (1) including 
models of digital systems into NPP probabilistic risk assessments 
(PRAs), and (2) incorporating digital systems in the NRC's risk-
informed licensing and oversight activities.
    A previous Brookhaven National Laboratory (BNL) technical report, 
entitled ``Review of Quantitative Software Reliability Methods,'' BNL-
94047-2010 (ADAMS Accession No. ML102240566), documented a review of 
currently available quantitative software reliability methods (QSRMs) 
that can be used to quantify software failure rates and probabilities 
of digital systems at NPPs for use in PRAs and identified a set of 
desirable characteristics for QSRMs. The current draft report documents 
a comparison of the previously-identified QSRMs against the set of 
desirable characteristics. Three candidate QSRMs were identified for 
further literature review to assess their suitability for estimating 
demand-failure probabilities of safety-critical protection systems and 
to formulate an approach for applying each of them to an example system 
in a case study. The example digital protection system to be used in 
the case studies is also identified. The actual case studies will be 
documented in separate reports. Completion of the case studies is 
expected to provide a much better understanding of the existing 
capabilities and limitations in treating software failure in digital 
system reliability models for use in NPP PRAs.

    Dated at Rockville, Maryland, this 10th day of May, 2011.

    For the Nuclear Regulatory Commission.
Kevin A. Coyne,
Chief, Probabilistic Risk Assessment Branch, Division of Risk Analysis, 
Office of Nuclear Regulatory Research.
[FR Doc. 2011-12200 Filed 5-17-11; 8:45 am]
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