ML26042A194
| ML26042A194 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 02/11/2026 |
| From: | James Holloway Dominion Energy Nuclear Connecticut |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| 25-301B | |
| Download: ML26042A194 (0) | |
Text
Dominion Energy Nuclear Connecticut, Inc 5000 Dominion Boulevard, Glen Allen, VA 23060 Dominion Energy.com February 11, 2026 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 DOMINION ENERGY NUCLEAR CONNECTICUT, INC.
MILLSTONE POWER STATION UNIT 3
~
Dominion
- iii" Energy Serial No.
NRA/NDM:
Docket No.:
License No.:
25-301B RO 50-423 NPF-49 SUPPLEMENT TO APPLICATION TO REVISE TECHNICAL SPECIFICATIONS TO ADOPT TSTF-601, "EXTEND SHIELD BUILDING COMPLETION TIME AFTER REFUELING" By letter dated December 18, 2025 (NRC Agencywide Documents Access and Management System (ADAMS) Accession No. ML25353A596) Dominion Energy Nuclear Connecticut, Inc. (DENC) submitted a license amendment request (LAR) to revise to the Technical Specifications (TS) for Millstone Power Station Unit 3 (MPS3) to adopt Technical Specifications Task Force (TSTF) Traveler 601, "Extend Shield Building Completion Time After Refueling." TSTF-601 revises the shield building TS to add a new Action that is applicable prior to criticality following a refueling outage.
DENC is supplementing the LAR to revise two items:
- , Section 2.1, "Applicability of Safety Evaluation," states that the NRC issued the safety evaluation for TSTF-601 on March 6, 2025. This is the date the NRC provided the draft safety evaluation. The final safety evaluation was issued on September 8, 2025.
- , "Marked-Up Technical Specifications Pages for MPS3," Page 2 of 2, "Unit 3 TS Insert," is revised. Paragraph a. of the insert states, "If in HOT STANDBY or HOT SHUTDOWN, and STARTUP has not been entered following refueling, restore the Secondary Containment to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />." If the unit is in Hot Standby or Hot Shutdown, it is unnecessary to specify that the unit must be in Hot Standby within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. A revised insert is included as Attachment 1 to this letter.
This letter contains no new regulatory commitments.
In accordance with 10 CFR 50.91 (b ), a copy of this supplement is being provided to the State of Connecticut.
Pursuant to 10 CFR 50.92, the revised changes proposed do not affect the conclusion of the Significant Hazards Consideration presented in the December 18, 2025 LAR.
Serial No.: 25-3018 Docket No.: 50-423 Page 2 of 3 If you have any questions or require additional information, please contact Nick Maynard at (804) 273-3910.
I declare under penalty of perjury that the foregoing is true and correct.
Executed on February 11, 2026 Sincerely, James E. Holloway Vice President - Nuclear Engineering and Fleet Support : Revised Unit 3 TS Insert
cc:
U.S. Nuclear Regulatory Commission Region I 475 Allendale Road, Suite 102 King of Prussia, PA 19406-1415 Theo L. Edwards Project Manager U.S. Nuclear Regulatory Commission One White Flint North, Mail Stop O-8C04 11555 Rockville Pike Rockville, MD 20852-2738 NRC Senior Resident Inspector Millstone Power Station Director, Radiation Division Department of Energy and Environmental Protection 79 Elm Street Hartford, CT 06106-5127 Serial No.: 25-301 B Docket No.: 50-423 Page 3 of 3 REVISED UNIT 3 TS INSERT Dominion Energy Nuclear Connecticut, Inc.
Millstone Power Station 3 Serial No.: 25-3018 Docket No.: 50-423
Unit 3 TS Insert With the Secondary Containment inoperable, Serial No.: 25-301 B Docket No.: 50-423 Page 1 of 1
- a. If in HOT STANDBY or HOT SHUTDOWN, and STARTUP has not been entered following refueling, restore the Secondary Containment to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />; or
- b. Restore the Secondary Containment to OPERABLE status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.