[Federal Register Volume 90, Number 225 (Tuesday, November 25, 2025)]
[Notices]
[Pages 53402-53403]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2025-20929]
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NUCLEAR REGULATORY COMMISSION
[NRC-2025-0089]
Research Information Letter Report: Integrated Human Event
Analysis System Dependency Analysis Guidance (IDHEAS-DEP)
AGENCY: Nuclear Regulatory Commission.
ACTION: Request for comment.
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SUMMARY: The U.S. Nuclear Regulatory Commission (NRC) is seeking public
comment on the Research Information Letter (RIL) report, ``Integrated
Human Event Analysis System Dependency Analysis Guidance (IDHEAS-
DEP),'' which establishes guidance that documents how to perform a
dependency analysis using the dependency model included in Integrated
Human Event Analysis System for Event and Condition Assessment (IDHEAS-
ECA) method for human reliability analysis (HRA).
DATES: Submit comments by January 26, 2026. 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:
[[Page 53403]]
Federal rulemaking website: Go to https://www.regulations.gov and search for Docket ID NRC-2025-0089. Address
questions about Docket IDs in Regulations.gov to Bridget Curran;
telephone: 301-415-1003; email: [email protected].
For technical questions, contact the individual(s) 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.
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: Jing Xing, Office of Nuclear
Regulatory Research, U.S. Nuclear Regulatory Commission, Washington, DC
20555-0001, telephone: 301-415-2410, email: [email protected].
SUPPLEMENTARY INFORMATION:
I. Obtaining Information and Submitting Comments
A. Obtaining Information
Please refer to Docket ID NRC-2025-0089 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-2025-0089.
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 ADAMS Public Search.''
For problems with ADAMS, please contact the NRC's Public Document Room
(PDR) reference staff at 1-800-397-4209, at 301-415-4737, or by email
to [email protected]. The RIL report, RIL 2021-14, is available in
ADAMS under Accession No. ML21316A104.
NRC's PDR: The PDR, where you may examine and order copies
of publicly available documents, is open by appointment. 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
a.m. and 4 p.m. eastern time, 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-2025-0089 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. All comments should
reference the applicable report.
II. Discussion
The NRC Research Information Letter report, RIL 2021-14, discusses
the dependency of human failure events in the context of human
reliability analysis (HRA) which refers to the impact of failure of a
human action on performance of subsequent human actions. HRA assesses
the impact of dependency on human error probabilities as inputs to
probabilistic risk analysis models. The staff at the NRC developed a
HRA method, referred to as the Integrated Human Event Analysis System
for Event and Condition Assessment (IDHEAS-ECA), which includes a human
action dependency model. The staff further developed detailed guidance
for applying the dependency model to quantify the human error
probability of a human action due to the dependency, and to gain a
systematic understanding of factors contributing to dependency, and how
the dependency impact can be mitigated. This RIL report presents the
dependency guidance, along with worksheets and templates for using the
guidance, and two full examples of performing HRA with the IDHEAS-ECA
method and the dependency guidance. This RIL report can be used for HRA
dependency analysis in combination with the IDHEAS-ECA method or stand
alone for applications involving analyzing human action dependency.
III. Executive Order (E.O.) 12866
The Office of Information and Regulatory Affairs determined that
this RIL-2021-14 is not a significant regulatory action under E.O.
12866.
(Authority: 42 U.S.C. 2011 et seq.)
Dated: November 20, 2025.
For the Nuclear Regulatory Commission.
Sean Peters,
Chief, Human Factors and Reliability Branch, Division of Risk Analysis,
Office of Nuclear Regulatory Research.
[FR Doc. 2025-20929 Filed 11-24-25; 8:45 am]
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