[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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