NL-25-0463, Supplement to Response to Request for Additional Information License Amendment Requests to Increase Flexibility in Mode Restraints and to Revise Shutdown Actions Mode Change Restrictions
| ML25353A427 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 12/18/2025 |
| From: | Coleman J Southern Nuclear Operating Co |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| NL-25-0463 | |
| Download: ML25353A427 (0) | |
Text
3535 Colonnade Parkway Birmingham, AL 35243 205.992.5000 Regulatory Affairs December 18, 2025 Docket Nos.: 52-025 NL-25-0463 52-026 10 CFR 50.90 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Southern Nuclear Operating Company Vogtle Electric Generating Plant Units 3 and 4 Supplement to Response to Request for Additional Information License Amendment Requests to Increase Flexibility in Mode Restraints and to Revise Shutdown Actions Mode Change Restrictions Ladies and Gentlemen:
Pursuant to 10 CFR 52.98(c) and in accordance with 10 CFR 50.90, Southern Nuclear Operating Company (SNC) requested two amendments to the combined license (COL) for Vogtle Electric Generating Plant (VEGP) Unit 3 (License Number NPF-91) and Unit 4 (License Number NPF-92). The requested amendments (ML24354A169, L-2024-LLA-0171 and ML25023A275, L-2025-LLA-0011) proposed changes to the COLs Appendix A, Technical Specifications (TS), to increase flexibility in mode restraints and to revise unnecessarily restrictive and potentially conflicting Required Actions that may also restrict mode changes while shutdown, respectively.
On October 31, 2025, SNC responded to an NRC request for additional information addressing the topics determined by the audit to require additional information. The previously submitted regulatory evaluations (including the Significant Hazards Consideration Determinations),
environmental considerations and the markups depicting the requested changes were not impacted by the additional information.
Based on follow-up questioning, it was determined that one portion of the responses requires minor revision. Specifically, the Enclosure to NL-25-0388, RAI Response 2d, is revised such that item 2.a.ii for RNS gravity injection, is revised to read:
ii. In B-ADM-OPS-011, the ADS stage 4 revision is to be reflected in a note associated with the Decay Heat Removal matrix in Figure 1 and the Inventory Control matrix in Figure 2.
The relevant portion of the note will state that RNS gravity injection requires availability of ADS stage 4, specifically 2 out of 4 paths with 1 path on the non-pressurizer RCS loop in POS IV, V and VI. The note will also state that ADS stage 4 is not required in POS VII.
U. S. Nuclear Regulatory Commission NL-25-0463 Page 2 SNC expects to implement the proposed amendments within 90 days of issuance.
This letter contains no regulatory commitments. This letter has been reviewed and determined not to contain security-related information.
In accordance with 10 CFR 50.91, a copy of this application, with enclosures, is being provided to the designated State of Georgia official.
If you have any questions, please contact Mr. Ryan Joyce at (205) 992-6468.
I declare under penalty of perjury that the foregoing is true and correct.
Executed on the 18th day of December 2025.
Respectfully submitted, Jamie M. Coleman Regulatory Affairs Director cc: NRC Regional Administrator, Region ll NRR Project Manager - Vogtle 3 & 4 Senior Resident Inspector - Vogtle 3 & 4 Director, Environmental Protection Division - State of Georgia Document Services RTYPE: VND.LI.L00 Digitally signed by JAMIEMCO Date: 2025.12.18 08:49:08
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