ML22024A172
| ML22024A172 | |
| Person / Time | |
|---|---|
| Issue date: | 02/23/2023 |
| From: | Russell Felts NRC/NRR/DNRL/NLRP |
| To: | |
| James L | |
| References | |
| RIS-14-006, Rev. 1 | |
| Download: ML22024A172 (7) | |
See also: RIS 2014-06
Text
UNITED STATES
NUCLEAR REGULATORY COMMISSION
OFFICE OF NUCLEAR REACTOR REGULATION
WASHINGTON, DC 20555-0001
DRAFT NRC REGULATORY ISSUE SUMMARY 2014-06, REVISION 1,
CONSIDERATION OF CURRENT OPERATING ISSUES
AND LICENSING ACTIONS IN LICENSE RENEWAL
ADDRESSEES
All holders of, or applicants for, a power reactor operating license or construction permit under
Title 10 of the Code of Federal Regulations (10 CFR) Part 50, Domestic Licensing of
Production and Utilization Facilities, except those that have certified that they have
permanently ceased operations and permanently removed all fuel from the reactor vessel.
All holders of, or applicants for, a power reactor early site permit or a combined license under
10 CFR Part 52, Licenses, Certifications, and Approvals for Nuclear Power Plants.
INTENT
The U.S. Nuclear Regulatory Commission (NRC) is issuing this regulatory issue summary (RIS)
to provide information to applicants and licensees on how the NRC considers current operation
of the facility in the license renewal review under 10 CFR Part 54, Requirements for Renewal of
Operating Licenses for Nuclear Power Plants. This RIS requires no action or written response
on the part of any addressee.
BACKGROUND INFORMATION
In 10 CFR 54.21, Contents of applicationtechnical information, and 10 CFR 54.23, Contents
of applicationenvironmental information, the regulations identify the technical information that
must be submitted in a license renewal application (LRA) to enable the NRC staff to make a
determination that the license may be renewed, as identified in 10 CFR 54.29, Standards for
issuance of a renewed license. The license renewal review focuses on the management of
aging for structures and components within the scope of license renewal. To grant a renewed
license in accordance with 10 CFR 54.29, the NRC must find, in part, that the applicant has
demonstrated compliance with the current licensing basis (CLB) as follows:
(a) Actions have been identified and have been or will be taken with respect to
the matters identified in Paragraphs (a)(1) and (a)(2) of this section, such that
there is reasonable assurance that the activities authorized by the renewed
license will continue to be conducted in accordance with the CLB, and that any
changes made to the plants CLB in order to comply with this paragraph are in
accord with the Act and the Commissions regulations. These matters are:
(1) managing the effects of aging during the period of extended operation on the
functionality of structures and components that have been identified to require
review under § 54.21(a)(1); and
RIS 2014-06, Rev. 1
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(2) time-limited aging analyses that have been identified to require review under
§ 54.21(c).
Licensing actions and current operating issues may arise during the review of either initial or
subsequent LRAs that may affect aspects of the review. For example, during the NRC staffs
review of an LRA, separate licensing actions, other CLB changes, and operating experience
have challenged the NRC staffs ability to conclude that the applicant has demonstrated it will
adequately manage the effects of aging. Whether these issues need to be considered in the
license renewal review depends on the effect that the information will have on the required
finding of 10 CFR 54.29(a) in regard to the adequacy of aging management for structures and
components and the applicants evaluation of time-limited aging analyses (TLAAs).
SUMMARY OF ISSUE
As required by 10 CFR 54.21(b), license renewal applicants need to update their applications
with newly-developed information that could impact aging management of structures and
components. Newly-identified information related to a current operating license issue or CLB
change(s) include the following examples:
- a significant change to the CLB that affects the scope of license renewal as provided in
the LRA
- a current operating issue that potentially challenges the adequacy of the applicants
aging management programs (AMPs)
- recent operating experience (that occurred between the operating experience review
cutoff date and the submission of the LRA) or late-breaking operating experience (that
arose during the LRA review) that potentially challenges the adequacy of the applicants
These examples highlight some issues that may affect the NRC staffs license renewal review.
Addressing these and similar issues may require more resources from the applicant and the
NRC staff, potentially delaying the license renewal review schedule.
The above considerations pertain to current operating license holders. In addition, although
current combined license holders have yet to commence operation, the information in this RIS
may be useful to help them develop and implement operational programs that would facilitate
eventual license renewal.
1. Issues affecting the scope of license renewal
The applicants determination of systems, structures, and components (SSCs) within the scope
of license renewal must be based on the CLB. Significant changes to the CLB that occur during
the license renewal review present challenges because the CLB, and thus the scope of license
renewal, may be in flux. Such changes can arise from other licensing actions that are processed
concurrently with the LRA. To comply with 10 CFR 54.21(a), license renewal applicants must
ensure the license renewal scope reflects their current CLB.
These challenges are highlighted when an applicant submits its LRA concurrent with other
major licensing actions. For example, an applicants implementation of an NRC-approved
RIS 2014-06, Rev. 1
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extended power uprate can affect multiple areas of the CLB, such as the reactor vessel
internals and calculations for neutron fluence, upper shelf energy, and pressure-temperature
limits. The changes to such areas of the CLB also can result in significant modifications to major
balance-of-plant equipment.
When the review of these types of major licensing actions occurs concurrently with the license
renewal review, applicants should give extra consideration to the possibility of significant
changes to the CLB that could materially affect the LRA. Such changes may necessitate new
AMPs and TLAAs or may introduce new and significant aging effects and mechanisms that
could result in the addition of multiple aging management review line items to the LRA.
Examples of CLB changes that potentially are not significant such that the LRA would not be
materially affected could involve SSCs that are removed from the scope of license renewal or
SSCs that were added in scope but are already accounted for by existing aging management
activities in the LRA. Regardless of the significance of the impact to the LRA, the NRC staff
must review all such CLB changes before it can make the finding required by 10 CFR 54.29(a).
Therefore, LRA reviews that occur concurrently with licensing action reviews or other CLB
changes may require extra consideration, resources, and review time, including reviews held in
abeyance pending final determination of the impact of the CLB change on the LRA.
How significant changes to the CLB may affect the license renewal review depends on when the
CLB change is made. Figure 1 below shows four scenarios of CLB changes, labeled A through
D, and their relationship to the license renewal review. Scenario A marks a CLB change that
occurs before the LRA is submitted. Scenario B marks a CLB change that occurs before the last
required LRA update. Scenario C marks a CLB change that occurs after the last required LRA
update but before the renewed license decision. Scenario D marks a CLB change that occurs
after issuance of the renewed license.
Last Required LRA Renewed License
LRA Receipt Update Issued
A B C D
Figure 1 CLB change and LRA review timeline
Scenario A. If the CLB change is implemented before the LRA receipt, the LRA should reflect
the applicable CLB changes before submission, in accordance with the requirements of
10 CFR 54.21(a), (c), and (d), and 10 CFR 54.22, Contents of applicationtechnical
specifications.
Scenario B. CLB changes are reported pursuant to 10 CFR 54.21(b). As stated in
10 CFR 54.21(b), license renewal applicants must amend the LRA annually, to identify any CLB
changes that materially affect the contents of the LRA, including the [final safety analysis report]
supplement. The last annual update to the LRA that the applicant is required to submit is at
least 3 months before the scheduled completion of the NRC review. This update must capture
all CLB changes up to that point that materially affect the contents of the LRA in accordance
with 10 CFR 54.21(b). The NRC staff will evaluate these CLB changes for significance and
RIS 2014-06, Rev. 1
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therefore may need additional time to make the finding required by 10 CFR 54.29(a). The NRC
staff will issue its safety evaluation report when all open items have been closed, including any
open items associated with the reported CLB changes.
Scenario C. If the CLB change is implemented after the last required LRA update but before the
renewed license decision, the NRC staff will still evaluate the CLB changes that materially affect
the LRA for significance. The NRC staff will review these changes to determine whether they
affect the finding required by 10 CFR 54.29(a). If there is an impact to this finding, the NRC staff
may extend the review schedule to evaluate the CLB changes and their effects on aging
management and TLAAs before making its 10 CFR 54.29(a) finding.
Scenario D. CLB changes that occur after the renewed license is issued are addressed by Part
50 requirements (e.g., 50.59, 50.90) and may also be subject to the 10 CFR 54.37(b) reporting
requirements. RIS 2007-16, Revision 1, Implementation of the Requirements of
10 CFR 54.37(b) for Holders of Renewed Licenses, dated April 28, 2010 (Agencywide
Documents Access and Management System (ADAMS) Accession No. ML100250279),
provides additional information on these post-renewal reporting requirements.
2. Operating experience that occurs after the development of the application or during the
license renewal application review
As discussed in NUREG-2192, Revision 0, Standard Review Plan for Review of Subsequent
License Renewal Applications for Nuclear Power Plants, Appendix A.4, issued July 2017
(ADAMS Accession No. ML17188A158) for subsequent license renewal (for plant operation
from 60 to 80 years) and in LR-ISG-2011-05, Ongoing Review of Operating Experience, for
license renewal (for plant operation from 40 to 60 years) issued March 2012 (ADAMS Accession
No. ML12044A215), operating experience is a crucial aspect of any efforts to effectively
manage aging effects. Operating experience provides support for all other aspects of effective
AMPs and, as a continuous feedback mechanism, is used to identify AMP changes that are
necessary to maintain the overall effectiveness of the AMP. Operating experience can provide
objective evidence to support the conclusion that the effects of aging are managed adequately
so that the intended function(s) of structures and components will be maintained during the
period of extended operation. Pursuant to 10 CFR 54.21(a)(3), a license renewal applicant is
required to demonstrate that the effects of aging on structures and components subject to an
aging management review are adequately managed so that their intended function(s) will be
maintained consistent with the CLB for the period of extended operation.
The NRC staff acknowledges and understands that applicants must set a cutoff date for the
review of operating experience in order to complete and submit their applications for the staffs
review. However, recent (between the operating experience review cutoff date and the
submission of the LRA) or late-breaking (during the LRA review), operating experience could
affect an applicants ability to define its aging management activities and thus affect the staffs
ability to reach a regulatory decision under 10 CFR 54.29(a). For example, if a new aging
mechanism is identified during the LRA review, such as a corrosion mechanism that could
compromise the pressure boundary of a piping component subject to an aging management
review, the applicant must determine whether the proposed inspection techniques and
inspection frequencies are capable of identifying loss of material prior to a loss of intended
function. This may result in the applicant augmenting the specific aging management program,
or developing a new plant specific AMP, to demonstrate that the effects of aging will be
adequately managed.
RIS 2014-06, Rev. 1
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To make the finding required by 10 CFR 54.29(a), the NRC staff needs to receive information
about recent and late-breaking operating experience, if it materially affects an AMP, to have
sufficient technical basis to evaluate the adequacy of the applicants aging management
activities. License renewal applicants should inform the staff in a timely manner of recent or late-
breaking operating experience using appropriate communication vehicles, including voluntary
supplements to the application and the annual update required by 10 CFR 54.21(b), as
delineated above. The NRC will evaluate the recent and late-breaking operating experience for
impacts to the adequacy of the applicants AMPs and, therefore, may need additional
information and time to determine whether the finding required by 10 CFR 54.29(a) may be
made.
BACKFITTING AND ISSUE FINALITY DISCUSSION
This RIS provides information that clarifies how a licensing action or current operating issue that
is identified during a license renewal review may affect the NRCs determination on license
renewal. This RIS requires no action or written response. Therefore, the RIS does not contain a
new or changed NRC staff position or an interpretation of the regulations that would constitute
backfitting as defined in 10 CFR 50.109, Backfitting, or represent an inconsistency with
applicable issue finality provisions in 10 CFR Part 52.
FEDERAL REGISTER NOTIFICATION
The NRC will publish a notice of opportunity for public comment on this draft RIS in the Federal
Register.
CONGRESSIONAL REVIEW ACT
This RIS is not a rule as defined in the Congressional Review Act (5 U.S.C. §§ 801-808).
PAPERWORK REDUCTION ACT STATEMENT
This RIS does not contain new or amended information collection requirements that are subject
to the Paperwork Reduction Act of 1995 (44 U.S.C. 3501 et seq.). Existing requirements were
approved by the Office of Management and Budget (OMB), approval number 3150-0155.
Public Protection Notification
The NRC may not conduct or sponsor, and a person is not required to respond to, a collection
of information unless the document requesting or requiring the collection displays a currently
valid OMB control number.
RIS 2014-06, Rev. 1
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CONTACT
Please direct any questions about this matter to the technical contact listed below.
Russell Felts, Director
Division of Reactor Oversight
Office of Nuclear Reactor Regulation
Lead Project Manager: Christopher Tyree, NRR
301-415-3754
Email: Christopher.Tyree@nrc.gov
Note: NRC generic communications may be found on the NRC public website,
http://www.nrc.gov, under NRC Library/Document Collections.
ML22024A172 *via e-concurrence L-2021-GEN-0005
OFFICE PM:NLRP:DNRL Tech Editor BC:NLRP:DNRL D:DNRL OCIO OE
NAME CTyree Azariah-Kribbs LGibson BSmith DCullison JPeralta
DATE 11/21/2022 7/08/2022 11/17/2022 11/21/2022 1/18/2023 12/7/2022
OFFICE OGC LA:IOEB:DRO PM:IOEB:DRO BC:IOEB:DRO D:DRO:NRR
NAME STurk IBetts BBenney LRegner RFelts
DATE 1/17/2023 2/2/20233 2/13/2023 2/10/2023 2/23/2023