ML25065A220
| ML25065A220 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 03/06/2025 |
| From: | Goolsbey M Dominion Energy Nuclear Connecticut |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| 25-056 | |
| Download: ML25065A220 (1) | |
Text
Dominion Energy Nuclear Connecticut, Inc.
Millstone Power Station 314 Rope Ferry Road, Waterford, CT 06385 Dominion Energy.com U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 MAR *O. 6 20,25 DOMINION ENERGY NUCLEAR CONNECTICUT, INC.
MILLSTONE POWER STATION UNIT 2
- ..-=--_-: Dominion
~
Energy Serial No.
NSS&L/TFO Docket No.
License No.25-056 RO 50-336 DPR-65 INSERVICE INSPECTION PROGRAM - OWNER'S ACTIVITY REPORT, REFUELING OUTAGE 29 Dominion Energy Nuclear Connecticut, Inc. hereby submits the American Society of Mechanical Engineers (ASME),Section XI, Form OAR-1, Owner 1s Activity Report for the period from July 2, 2023, through Refueling Outage 29, completed on November 7, 2024, for Millstone Power Station Unit 2. The enclosure is in accordance with the requirements of ASME Code Case N-532-5 and N-892.
If you have any questions or require additional information, please contact Lori E. Kelley at (860) 447-1791, Extension 6520.
Sincerely, fij \\v. ~
Mark W. Goolsbey Director, Nuclear Station Safety and Licensing
Enclosure:
Millstone Power Station Unit 2, Owner's Activity Report - Refueling Outage 29 Commitments made in this letter:
None
- cc:
U.S. Nuclear Regulatory Commission Region I 475 Allendale Rd Suite 102 King of Prussia, PA 19406-1415 R. V. Guzman NRC Senior Project Manager Serial No.25-056 Owner's Activity Report, 2R29 Docket No. 50-336 Page 2 of 2 U.S. Nuclear Regulatory Commission, Mail Stop 08 C2 One White Flint North 11555 Rockville Pike Rockville, MD 20852-2738 NRC Senior Resident Inspector Millstone Power Station
ENCLOSURE MILLSTONE POWER STATION UNIT 2 OWNER'S ACTIVITY REPORT REFUELING OUTAGE 29 Serial No.25-056 Docket No.
50-336 MILLSTONE POWER STATION UNIT 2 DOMINION ENERGY NUCLEAR CONNECTICUT, INC.
Report Number:.:.:..;M:.:..P-=2--=2:..:....R=2..;;;..9 ______________ _
Plant: __
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1 ___,_R...:..:o:::.i:p=e'-'F....!e:::.!..r!.,J.N....!R...!..:o=a::.::d:..i..,..!..W.!..!:a~te=rf..:..::o:::.!..r=d,'---'C=o=n=n=e=ct=ic=u=t c....:0:..:a6:.:::3=8=-5 ____ _
Unit No.
2 Commercial service date: 12/26/1975 Refueling outage no. 29 (if applicable)
Current inspection interval: ____
___;;;;5...;:.:.th.;....._ __________ _
(1 5\\ 2nd, 3rd, 4th, other)
Current inspection period: ------"-"2"""'n"""d'--------------
( 15t, 2nd 1 3rd)
Edition and Addenda of Section XI applicable to the inspection plans: 2013 Edition, No Addenda Date and revision of inspection plans: __
____:_:.M=a>+y_1=2,.,_. =20=2::...c1,_,/c.....!R-'-'e=v'--'-'is=io=n_,_,_1 ____________ _
Edition and Addenda of Section XI applicable to repair/replacement activities, if different than the inspection plans:
NIA Code Cases used for inspection and evaluation:
N-532-5, N-716-1, N-770-5,N-805, N-831-1, N-892 (if applicable, including cases modified by Case N-532 and later revisions)
CERTIFICATE OF CONFORMANCE I certify that (a) the statements made in this report are correct; (b) the examinations and tests meet the Inspection Plan as required by the ASME Code,Section XI; and (c) the repair/replacement activities and evaluations supporting the completion of 2R29 conform to the requirements of Section XI.
Signed (refueling outage number)
~upervisor, Nuclear Engineering ISi and NOE Programs Date _0_3_/_0_5_/2_0_2_5 __
o Owner's Designee, Title CERTIFICATE OF INSERVICE INSPECTION I, the undersigned, holding a valid commission issued by the National Board of Boiler and Pressure Vessel Inspectors and employed by The Hartford Steam Boiler Inspection and Insurance Company of Hartford. Connecticut have inspected the items described in this Owner's Activity Report, and state that, to the best of my knowledge and belief, the Owner has performed all activities represented by this report in accordance with the requirements of Section XI.
By signing this certificate neither the Inspector nor his employer makes any warranty, expressed or implied, concerning the repair/replacement activities and evaluation described in this report. Furthermore, neither the Inspector nor his employer shall be liable in any manner for any personal injury or property damage or a loss of any kind arising from or connected with this inspec *.
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/7/20
},J, llJ)-1K 1 i3 National Board Number and EndorsemJnt I Form No. 729595 (Apr 2021)
Table 1 Items with Flaws or Relevant Conditions That Required Evaluation for Continued Service Examination Category and Item Number Item Description Evaluation Description Areas of corrosion evaluated by Engineering and found to F-A / F1.20B Pipe support 506006-A be acceptable for continued service. Reference CR1272263.
Support spring load setting outside design tolerance.
F-A / F1.10C Pipe support 410061-A Evaluated by Engineering.
and found to be acceptable for continued service.
Reference CR1272701 Service Water pump strainer shell wall thickness was found to be below the design required thickness.
Engineering has evaluated this condition for structural integrity in accordance with Service Water pump strainer ASME Section XI, Non-NIA Mandatory Appendix U and M2L-1C found to be acceptable for continued service until such time that a repair can be made. Reference CR 1260581 and ETE -MP-2024-1001 Rev. 2. Repair tracked by CA 12727768 and work order 53203421493 Service Water pump strainer shell wall thickness was found to be below the design required thickness.
Engineering has evaluated this condition for structural integrity in accordance with NIA Service Water pump strainer ASME Section XI, Non-M2L-1A Mandatory Appendix U and found to be acceptable for continued service. Reference CR1247313 and ETE-MP-2024-1001 Rev. 1. Repair was completed on 04/26/2024 under work order 53203407667.
Form No. 729595 (Apr 2021)
Table 2 Abstract of Repair/Replacement Activities Required for Continued Service Code Item Description Date Repair/Replacement Class Description of Work Completed Plan Number Service Water 3
system strainer Perform weld repair 04/26/2024 53203407667 M2L-1A (U2-2878)
system piping line Replaced portions of number 4"-HUD-06/09/2024 53203421760 30 and '3"-HUD-degraded piping.
(U2-2897) 130 AFWsystem 3
pipe supports Replaced pipe support 10/30/2024 53203423121 505077 I 505078 (U2-2882) 3 AFWsystem pipe supports Modified pipe support 10/20/2024 53203441252 505083 I 405256 (U2-2869) 3 AFWsystem Modified pipe support pipe supports 10/20/2024 53203441251 30597 4 I 505073 (U2-2868) 3 AFWsystem Modified pipe support 53203441192 10/20/2024 pipe supports (U2-2866) 405269 I 405270 10/29/2024 53203441461 (U2-2894) 3 AFWsystem pipe supports Modified pipe support 10/20/2024 53203441250 505076 I 305972 (U2-2867) 3 AFWsystem 53203441930 pipe supports Replaced pipe support 10/24/2024 (U2-2892) 305968 I 305983 53203422602 (U2-2888)
pipe supports Replaced pipe support 11/1/2024 53203420084 305966 I 305981 (U2-2862)
pipe supports Modified pipe support 11/12/2024 53203421498 405283 I 405284 (U2-2890)
AFWsystem Replaced portions of 3
pipe support 11/03/2024 53203421497 505070 pipe support (U2-2884)
RBCCW system 3
to "A" RCP motor Replaced flex hose 53203442194 inlet and outlet assemblies 11/1/2024 (U2-2872) flex hoses.
Steam Generator Replace stud & nut, 1
Primary Manway 10/27/2024 53203441230 Fasteners refer to CR 1284832 (U2-2864)
Form No. 729595 (Apr 2021)