ML25251A109
| ML25251A109 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 09/08/2025 |
| From: | Samson Lee Plant Licensing Branch IV |
| To: | Richardson M Pacific Gas & Electric Co |
| Lee S, 301-415-3158 | |
| References | |
| EPID L-2025-LLA-0122, TS 3.7.12 | |
| Download: ML25251A109 (1) | |
Text
From:
Samson Lee To:
Richardson, Michael
Subject:
Acceptance Review: Diablo Canyon proposed revision to Technical Specification 3.7.12, Auxiliary Building Ventilation System (ABVS) (EPID: L-2025-LLA-0122)
Date:
Monday, September 8, 2025 11:13:00 AM By \
letter dated July 31, 2025 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML25213A095), Pacific Gas and Electric Company (PG&E, the licensee) submitted a request to revise Technical Specification (TS) 3.7.12, Auxiliary Building Ventilation System (ABVS), for the Diablo Canyon Nuclear Power Plant, Units 1 and 2, to prevent unnecessary unit shutdowns for a low-risk scenario. The purpose of this email is to provide the results of the U.S. Nuclear Regulatory Commission (NRC) staffs acceptance review of this 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 application 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 application and concluded 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 change 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, the licensee will be advised by separate correspondence.
The NRC staff has evaluated precedence related to this request and determined that, on average, the reviews have required 327.7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> and 9.0 months. To support a more efficient process, the NRC is setting a goal of 15% improvement. Based on that, our estimate for this review is 279 hours0.00323 days <br />0.0775 hours <br />4.613095e-4 weeks <br />1.061595e-4 months <br /> and 7.7 months (estimated completion date March 21, 2026). If emergent complexities or challenges arise during the NRC staffs review that affect the initial forecasted completion date or result in significant changes to the estimated review hours, the reasons for those changesalong with updated estimateswill be communicated during routine interactions with the assigned project manager. These estimates are based on the NRC staffs initial review of the application and may change due to several factors, including requests for additional information, unanticipated expansion of the review scope, hearing-related activities, or if the submittal is provided to the NRC in advance of or concurrently with industry program initiatives or pilot applications.
If you have any questions, please contact me.
Samson Lee Plant Licensing Branch 4 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation 301-415-3168
Docket Nos. 50-275 and 50-323