ML24116A011

Acceptance Review Determination for Proposed Alternative Request IR-4-13 Regarding Steam Generator Channel Head Drain Modification

ML24116A011
Person / Time
Site:	Millstone
Issue date:	04/25/2024
From:	Richard Guzman NRC/NRR/DORL/LPL1
To:	Sinha S Dominion Energy Nuclear Connecticut
References
EPID L-2024-LLR-0025
Download: ML24116A011 (1)

Text

From: Richard Guzman To: Shayan Sinha Cc: RidsNRRLIC109 Resource; Hipo Gonzalez

Subject:

Millstone Power Station, Unit 3 - Acceptance Review Determination for Proposed Alternative Request IR-4-13 Regarding Steam Generator Channel Head Drain Modification (EPID: L-2024-LLR-0025)

Date: Thursday, April 25, 2024 7:09:51 AM

Mr. Sinha,

By letter dated April 1, 2024 (ADAMS Accession No. ML24093A102), Dominion Energy Nuclear Connecticut, Inc. (the licensee) submitted alternative request IR-4-13 for Millstone Power Station, Unit No. 3 (MPS3), in support of performing modifications on the steam generator (SG) channel head drain connection on each SG in accordance with American Society of Mechanical Engineers (ASME) Code Case N-839. The proposed alternative requests relief from the code case requirements to use a 48-hour hold time and volumetric inspection method for final examination. The licensee proposes to perform progressive surface exams with the Liquid Dye Penetrant Examination (PT) process as an alternative to the final volumetric inspection. The proposed alternative is requested on the basis that compliance with the specified ASME Code Case examination requirements would result in hardship or unusual difficulty without a compensating increase in the level of quality and safety in accordance with Title 10 of the Code of Federal Regulations (10 CFR) section 50.55a(z)(2). The SG head drain modifications are scheduled to take place during the spring 2025 MPS3 refueling outage.

The purpose of this e-mail is to provide the results of the Nuclear Regulatory Commission (NRC) staffs acceptance review of this alternative request.The acceptance review was performed to determine if there is sufficient technical information in scope and depth to allow the NRC staff to complete its detailed technical review. The acceptance review is also intended to identify whether the submittal has any readily apparent information insufficiencies in its characterization of the regulatory requirements or the licensing basis of the plant.

The NRC staff has reviewed the licensees submittal and concludes that it does provide technical information in sufficient detail to enable the NRC staff to complete its detailed technical review and make an independent assessment regarding the acceptability of the proposed amendment in terms of regulatory requirements and the protection of public health and safety and the environment.Given the lesser scope and depth of the acceptance review as compared to the detailed technical review, there may be instances in which issues that impact the NRC staffs ability to complete the detailed technical review are identified despite completion of an adequate acceptance review.If additional information is needed, you will be advised by separate correspondence.

Based on the information provided in the submittal, the NRC staff has estimated that the review of the alternative request will take approximately 190 hours0.0022 days <br />0.0528 hours <br />3.141534e-4 weeks <br />7.2295e-5 months <br /> to complete.The NRC staff expects to complete this review by April 1, 2025.If there are emergent complexities or challenges in our review that would cause changes to the initial forecasted completion date (greater than a month) or significant changes in the forecasted hours (greater than 25%),

the reasons for the changes, along with the new estimates, will be communicated during the routine interactions with the assigned project manager. These estimates are based on the NRC staffs initial review of the application and they could change, due to several factors including requests for additional information and unanticipated addition of scope to the review. Additional delay may occur if the submittal is provided to the NRC in advance or in parallel with industry program initiatives or pilot applications.

Please contact me if you have any questions. A copy of this email will be made publicly available in ADAMS.

Thanks,

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Rich Guzman Sr. PM, Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Office: O-10H17 l Phone: (301) 415-1030 Richard.Guzman@nrc.gov