ML25161A105
| ML25161A105 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 06/10/2025 |
| From: | Turner Z Plant Licensing Branch II |
| To: | Jeanne Johnston Southern Nuclear Operating Co |
| References | |
| EPID L-2024-LLA-0173 | |
| Download: ML25161A105 (1) | |
Text
From:
Zach Turner To:
Johnston, Jeanne D.
Cc:
Joyce, Ryan M.; Lowery, Ken G.; John Lamb; Michael Markley; Rothschadl, Benjamin T.
Subject:
RAI - Vogtle 1&2 - LAR to Revise TS SR 3.6.6.8 - EPID L-2024-LLA-0173 Date:
Tuesday, June 10, 2025 11:33:00 AM Attachments:
Vogtle 1 and 2 - TS SR 3.6.6.8 - RAI-10635-R1-FINAL - EPID L-2024-LLA-0173.docx
- Jeanne, By letter dated December 19, 2024 (Agencywide Documents and Access Management System (ADAMS) Accession No. ML24354A346), Southern Nuclear Operating Company (SNC, the licensee) requested the Nuclear Regulatory Commission (NRC) staff approve a license amendment request for Vogtle Electric Generating Plant, Units 1 and 2,to revise the Frequency for Surveillance Requirement (SR) 3.6.6.8, Verify each spray nozzle is unobstructed.
To complete its review of the application, the U.S. Nuclear Regulatory Commission (NRC) staff requests additional information (RAI) as discussed in the attachment to this email. On May 30, 2025, the NRC staff sent the draft RAIs to SNC for review to determine if a clarifying call was needed. SNC requested a clarifying call, which was held on June 10, 2025.
As agreed upon in a clarification call held between SNC and the NRC staff, the licensee will respond to the request for additional information (RAI) within 30-days.
If you have any questions, you may contact me at 301-415-2258.
Very Respectfully,
Zach Turner, Project Manager Nuclear Regulatory Commission Division of Operating Reactor Licensing NRR/DORL/LPL2-1 (301) 415-2258 Office: OWFN-10C02 Mail Stop: O-08 B01A
1 REQUEST FOR ADDITIONAL INFORMATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION VOGTLE - UNITS 1 AND 2 - LAR TO REVISE TS SR 3.6.6.8 - CONTAINMENT SPRAY NOZZLE TEST FREQUENCY SOUTHERN NUCLEAR OPERATING COMPANY VOGTLE, UNITS 1, 2 DOCKET NO. 05000424, 05000425 ISSUE DATE: 06/10/2025
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Background===
In the letter dated December 19, 2024 (ML24354A346), Southern Nuclear Operating Company, Inc. (SNC, the licensee) requested changes to the Technical Specifications (TS) for Renewed Facility Operating License Nos. NPF-68 and NPF-81 for Vogtle Electric Generating Plant (VEGP), Units 1 and 2, respectively. The proposed change would revise the Frequency for Surveillance Requirement (SR) 3.6.6.8, "Verify each spray nozzle is unobstructed," from:
In accordance with the Surveillance Frequency Control Program to:
Following activities that could result in nozzle blockage To complete its review of the application, U.S. Nuclear Regulatory Commission (NRC) staff determined that additional information is needed as described below.
Regulatory Basis 10 CFR 50.36(c)(3) requires that surveillance requirements are met to ensure that facility operation is within safety limits and that limiting conditions for operation are met.10 CFR 50.36(c)(3) requires that surveillance requirements are met to ensure that facility operation is within safety limits and that limiting conditions for operation are met.
Question 1 As stated in Section 3.1.1, "Performance History," of the Enclosure to the licensee's submittal, the licensee stated that:
SNC has performed the following tests in accordance with TS SR 4.6.2.1.d (currently SR 3.6.6.8) which had an initial Frequency of 5 years. The results of these tests demonstrated unobstructed flow through the [Containment Spray System (CSS)] nozzles with one exception on Unit 1.
During performance of SR 4.6.2.1.d (currently SR 3.6.6.8) for Unit 1 in 1996, an obstruction was identified in one nozzle on the lower ring of the B train at 180 degrees.
The obstruction was evaluated and concluded that the condition would have no significant impact on the ability of the sprays to perform their safety function considering that there are 342 stainless steel spray nozzles in the containment. The subsequent test in 2006 did not identify an obstruction in any spray nozzle.
Provide additional information on the nature of the 1996 CSS obstruction found at VEGP, Unit 1, the cause of obstruction, and resolution of issue.
2 OFFICE NRR/DORL/LPL4/PM NRR/DSS/STSB/BC NRR/DSS/SCPB/BC NAME ZTurner SMehta MValentin-Olmeda DATE 06/10/2025 05/28/2025 05/28/2025 OFFICE NRR/DORL/LPL2-1/BC NRR/DORL/LPL4/PM NAME MMarkley ZTurner DATE 05/30/2025 06/10/2025