[Federal Register Volume 87, Number 145 (Friday, July 29, 2022)]
[Notices]
[Pages 45806-45807]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2022-16238]
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NUCLEAR REGULATORY COMMISSION
[NRC-2022-0130]
High Energy Arcing Fault Hazard Frequency and Consequence
Modeling
AGENCY: Nuclear Regulatory Commission.
ACTION: Draft NUREG; request for comment.
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SUMMARY: The U.S. Nuclear Regulatory Commission (NRC) is issuing for
public comment draft NUREG-2262, ``High Energy Arcing Fault Frequency
and Consequence Modeling.''
DATES: Submit comments by August 29, 2022. Comments received after this
date will be considered if it is practical to do so, but the Commission
is able to ensure consideration only for comments received on or before
this date.
ADDRESSES: You may submit comments by any of the following methods;
however, the NRC encourages electronic comment submission through the
Federal rulemaking website:
Federal Rulemaking Website: Go to https://www.regulations.gov and search for Docket ID NRC-2022-0130. Address
questions about Docket IDs in Regulations.gov to Stacy Schumann;
telephone: 301-415-0624; email: [email protected]. For technical
questions, contact the individual listed in the For Further Information
Contact section of this document.
Mail comments to: Office of Administration, Mail Stop:
TWFN-7-A60M, U.S. Nuclear Regulatory Commission, Washington, DC 20555-
0001, ATTN: Program Management, Announcements and Editing Staff.
[[Page 45807]]
For additional direction on obtaining information and submitting
comments, see ``Obtaining Information and Submitting Comments'' in the
SUPPLEMENTARY INFORMATION section of this document.
FOR FURTHER INFORMATION CONTACT: Gabriel J. Taylor, Office of Nuclear
Regulatory Research, U.S. Nuclear Regulatory Commission, Washington, DC
20555-0001, telephone: 301-415-0781, email: [email protected].
SUPPLEMENTARY INFORMATION:
I. Obtaining Information and Submitting Comments
A. Obtaining Information
Please refer to Docket ID NRC-2022-0130 when contacting the NRC
about the availability of information for this action. You may obtain
publicly available information related to this action by any of the
following methods:
Federal Rulemaking Website: Go to https://www.regulations.gov and search for Docket ID NRC-2022-0130.
NRC's Agencywide Documents Access and Management System
(ADAMS): You may obtain publicly available documents online in the
ADAMS Public Documents collection at https://www.nrc.gov/reading-rm/adams.html. To begin the search, 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, 301-415-4737, or
by email to [email protected]. The draft NUREG-2262 ``High Energy
Arcing Fault Frequency and Consequence Modeling'' is available in ADAMS
under Accession No. ML22158A071.
NRC's PDR: You may examine and purchase copies of public
documents, by appointment, at the NRC's PDR, Room P1 B35, One White
Flint North, 11555 Rockville Pike, Rockville, Maryland 20852. To make
an appointment to visit the PDR, please send an email to
[email protected] or call 1-800-397-4209 or 301-415-4737, between
8:00 a.m. and 4:00 p.m. Eastern Time (ET), Monday through Friday,
except Federal holidays.
B. Submitting Comments
The NRC encourages electronic comment submission through the
Federal rulemaking website (https://www.regulations.gov). Please
include Docket ID NRC-2022-0130 in your comment submission.
The NRC cautions you not to include identifying or contact
information that you do not want to be publicly disclosed in your
comment submission. The NRC will post all comment submissions at
https://www.regulations.gov as well as enter the comment submissions
into ADAMS. The NRC does not routinely edit comment submissions to
remove identifying or contact information.
If you are requesting or aggregating comments from other persons
for submission to the NRC, then you should inform those persons not to
include identifying or contact information that they do not want to be
publicly disclosed in their comment submission. Your request should
state that the NRC does not routinely edit comment submissions to
remove such information before making the comment submissions available
to the public or entering the comment into ADAMS.
II. Discussion
The NRC Office of Nuclear Regulatory Research and the Electrical
Power Research Institute (EPRI) are advancing the understanding and
state-of-practice for modeling High Energy Arcing Faults (HEAF) in fire
Probabilistic Risk Assessment. NUREG/CR-6850 and NUREG/CR-6850
Supplement 1 provide the basic methods to analyze the risk associated
with HEAFs in power distribution equipment (switchgear and load
centers) and bus ducts (including iso-phase bus ducts), respectively.
Since the publication of these two reports, the state of knowledge of
the HEAF phenomena has advanced significantly. A thorough understanding
of the nuclear power plant electrical distribution system and its
performance during faulted conditions along with a review and
categorization of industry events has occurred. Additionally,
experimentation--including full scale testing on HEAF-susceptible
equipment, small scale testing, and hazard estimation have increased
the understanding of parameters that affect the dimensions of the zone
of influence (ZOI).
In draft NUREG-2262 titled, ``High Energy Arcing Fault Frequency
and Consequence Modeling,'' the NRC worked with the EPRI to combine
previous HEAF-related research, methods, and data to improve realism in
calculating plant risk due to HEAFs. Ignition frequency and non-
suppression estimates are updated with the most recently available
industry operating experience. The ZOI configurations are expanded.
Previous guidance postulated one ZOI for each category of equipment
(switchgear and load centers, bus ducts, and iso-phase bus ducts). The
development and use of HEAF hazard estimation tools allowed for the
expansion of ZOI configurations by using scenario specific parameters
such as fault current magnitude, arc voltage, duration, location,
electrode composition, and type of equipment, to more accurately
predict the ZOI. The ZOIs results are grouped by the working group to
determine consensus ZOIs for the three classes of equipment with
varying levels of detail commensurate with potential risk significance.
The information contained within the draft research information
letter is expected to be used in the future as the state-of-the-art
method for characterizing the risk to nuclear facilities from a HEAF.
Dated: July 25, 2022.
For the Nuclear Regulatory Commission.
Mark H. Salley,
Chief, Fire and External Hazards Analysis Branch, Division of Risk
Analysis, Office of Nuclear Regulatory Research.
[FR Doc. 2022-16238 Filed 7-28-22; 8:45 am]
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