ML25258A096
| ML25258A096 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 09/12/2025 |
| From: | Chatman C Dominion Energy, Dominion Energy Nuclear Connecticut |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| 25-233 | |
| Download: ML25258A096 (1) | |
Text
Dominion Energy Nuclear Connecticut, Inc.
Millstone Power Station 314 Rope Ferry Road, Waterford, CT 06385 Dominion Energy.com September 12, 2025 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 DOMINION ENERGY NUCLEAR CONNECTICUT, INC.
MILLSTONE POWER STATION UNIT 3 Serial No.25-233 NSSL/TFO RO Docket No.
50-423 License No. NPF-49 3R23 REFUELING OUTAGE INSERVICE INSPECTION (ISi) OWNERS ACTIVITY REPORT EXTENSION This letter is to inform you that Dominion Energy Nuclear Connecticut, Inc. (DENC) will not be submitting the Millstone Power Station Unit 3 (MPS3), 3R23 Refueling Outage lnservice Inspection (ISi) Owner's Activity Report (OAR) by the 120-day due date after the completion of the refueling outage.
The 3R23 Refueling Outage ended on May 18, 2025, making the report due on September 15, 2025.
American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code Section XI (2013), Article IWA-6200, contains requirements for the development and submittal of the report.
Specifically, IWA-6240(b), indicates the report is to be issued within 90 calendar days after completion of each refueling outage.
Approved Code Case N-532-5 provides additional guidance related to report preparation and submission but specifies 90 calendar days. However, Code Case N-892 provides guidance that a period of 120 calendar days may be used as an alternative to IWA-6240(b). Code Case N-892 was approved on January 9, 2019, and is listed as "Acceptable for Use" in NRC's Regulatory Guide 1.147, Revision 21.
Title 10, Code of Federal Regulations (CFR) 50.55a, "Codes and Standards",
paragraph (b )(2)(xxxii) was subsequently revised to specify that the OAR must be submitted within 120 days after completion of each refueling outage.
The reason DENC is not able to meet the 120-day requirement is that several ASME XI Repair/Replacement Work Orders and associated NIS-2A forms are still being processed. A Condition Report has been entered into the station corrective action program to address gaps in station's ability to issue this report in a timely manner.
DENC expects that these forms will be processed, and the Owner's Activity Report will be submitted by October 30, 2025.
Serial No.25-233 MPS3 Owner's Activity Report Extension Docket No. 50-423 Page 2 of 2 If you have any questions or require additional information, please contact Ms. Lori K. Kelley, Manager Nuclear Emergency Preparedness/Licensing, at (860) 447-1791, extension 6520.
Sincerely, Christopher S. Chatman Director, Plant Support - Millstone Commitments made in this letter: None 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