ML26027A371
| ML26027A371 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 01/27/2026 |
| From: | Richard Guzman NRC/NRR/DORL/LPL1 |
| To: | Jonathan Brown Constellation Energy Generation |
| References | |
| EPID L-2025-LLR-0097 | |
| Download: ML26027A371 (0) | |
Text
From:
Rich Guzman To:
Brown, Jesse S: (Constellation Nuclear)
Cc:
RidsNRRLIC109 Resource; Undine Shoop; Reynolds, Ronnie J: (Constellation Nuclear)
Subject:
Nine Mile Point Nuclear Station, Unit 2 - Acceptance Review Determination - GVRR-8 Alternative Related to Excess Flow Check Valve Test Frequency (EPID: L-2025-LLR-0097)
Date:
Tuesday, January 27, 2026 6:49:21 PM Mr. Brown,
By \
letter dated December 19, 2025 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML25353A385), Constellation Energy Generation, LLC (CEG, the licensee) submitted Alternative Request GVRR-8 pursuant to Title 10 of the Code of Federal Regulations (10 CFR) 50.55a(z)(1). The licensee requested approval of a proposed alternative to the requirements of the American Society of Mechanical Engineers (ASME) Operation and Maintenance (OM) Code, specifically ISTC-3510, ISTC-3522(a),
and ISTC-3700, for certain reactor instrumentation line excess flow check valves (EFCVs) at Nine Mile Point Nuclear Station, Unit 2 (NMP2). The ASME OM Code requires these EFCVs to be exercised quarterly during plant operation or, if exercising is not practicable during plant operation or cold shutdown, during refueling outages. As an alternative, the licensee proposes to perform reverse-flow exercising and position indication verification testing on a representative sample consisting of an approximately equal number of EFCVs during each refueling outage, such that each EFCV would be tested at least once every five refueling cycles (nominally 10 years). The NRC staff will evaluate this alternative request for applicability to the current fourth inservice testing (IST) interval, which began on January 1, 2019, and is scheduled to end on December 31, 2028.
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 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 request 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. You will be advised of any further information needed to support the NRC staffs detailed technical review by separate correspondence.
For this request, the staff used the Graded Estimate Method (GEM) for licensing actions, which was discussed with industry during a public workshop on August 5, 2025 (ML25217A212). Based on this approach, the staff estimates that this review will require 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> (approximately a 20% reduction from historical averages) and expects to complete its review by May 29, 2026. These estimates are based on the staffs initial review of the request and could change, due to several factors including requests for additional
information and unanticipated addition of scope to the review. If there are emergent complexities or challenges in our review that would cause changes to the initial forecasted completion date or significant changes in the forecasted hours, the reasons for the changes, along with the new estimates will be communicated, during our routine interactions.
Please contact me if you have any questions. A copy of this email will be made publicly available in ADAMS as the official agency record.
~~~~~~~~~~~~
Richard V. Guzman Sr. Project Manager LPL1, Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Phone: (301) 415-1030 Richard.Guzman@nrc.gov