L-2023-103, Inservice Inspection Examination Report
| ML23215A087 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 08/03/2023 |
| From: | Strand D NextEra Energy Seabrook |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| L-2023-103 | |
| Download: ML23215A087 (1) | |
Text
August 3, 2023 U.S. Nuclear Regulatory Commission Attn.: Document Control Desk Washington, D.C. 20555-0001 Seabrook Station NEXTera ENERGY~
SEABROOK Docket No. 50-443 L-2023-103 lnservice Inspection Examination Report Enclosed is the NextEra Energy Seabrook, LLC lnservice Inspection Examination Report for inspections conducted prior to and during the twenty-second refueling outage that concluded on May 10, 2023.
The enclosed report is submitted pursuant to the requirements of paragraph IWA-6240 of the 2013 Edition of Section XI of the American Society of Mechanical Engineers (ASME)
Boiler and Pressure Vessel Code and approved ASME Code Case N-532-5, N-729-6, and N-716-1. Additionally, a copy of this letter and the enclosed report are being submitted to the State of New Hampshire.
Should you have any questions regarding this submission, please contact Mr. Kenneth Mack, Fleet Licensing Manager, at 561-904-3635.
Sincerely,
'),~ -s [ /
Dianne Strand General Manager Regulatory Affairs Enclosure cc:
NRG Region I Administrator NRG Project Manager, Project Directorate 1-2 NRG Senior Resident Inspector Brian Oliver, New Hampshire Department of Labor, Inspection Division PO Box 2076, Concord, NH 03302-2076 NextEra Energy Seabrook, LLC, P.O. Box 300, Lafayette Road, Seabrook, NH 03874
Enclosure to L-2023-103 Seabrook Station OR22 OAR-1 Summary Report (4 pages follow)
Report Number: ISI-SBK-OR22-2023 Plant:
NextEra Energy Seabrook, LLC P.O. Box 300 Seabrook, NH 0387 4 Commercial Service Date: August 19, 1990 Refueling Outage No.: OR22 Current Inspection Interval: ISi-Fourth Interval and IWE-Third Interval Current Inspection Period: ISi-First Period and IWE-First Period Edition and Addenda of Section XI applicable to the inspection plans:
ISi First lnterval-2013 Edition No Addenda and IWE Third lnterval-2013 Edition No Addenda Date and Revision of inspection plans: ISi Fourth Interval September 30, 2021 Rev. O and IWE Third Interval - September 21, 2021 Rev. 0 Edition and Addenda of Section XI applicable to repairs and replacements, if different than the inspection plan: Same CERTIFICATE OIF 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 OR22 conform to the requirements of Section XI.
Signed Donna R. Slivon Owner or Owner's Designee, Title CERTIFICATE OF INSIERVICIE INSPIECTIONI I, the undersigned, holding a valid commission issued by the National Board of Boiler and Pressure Vessel Inspectors and the State or Province of New Hampshire and employed by The Hartford Steam Boiler Inspection and Insurance Company of Hartford. CT 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 s empl er shall be liable in any manner for any personal injury or property damage or loss of any kind aris' g from connected with this inspection.
:....----,,..::;+------ Commissions A\\& JCJ-71):z; (National Board Number ~nd Endorsements)
Date 7..... g 1-::k.> !:). '5 Code Cases Used: N-532-5, N-729-6, and N-716-1 Page 1 of 4
TABLE 1 ITEMS WITH FLAWS OR RELEVANT CONDITIONS THAT REQUIRED EVALUATION FOR CONTINUED SERVICE Examination Category and Item Description Evaluation Description Item Number E-A Leak Chase AR02454986 (Leak Chase),
E1.30 Items identified Water was identified in six of the 57 leak chase plugs. The outer debris cover for the containment leak chase zone for HL5-11, HL 1-4, HL5-2, HL 1-22, HL2-20, HL 1-6, and the inner plugs have conditions that require evaluation. The leak chase test connections (LCTCs) are functioning as moisture barriers as defined by ASME Section XI 2013 Edition, Subsection IWE. The LCTCs include the cover plate, inner plug, and access box.
Engineering Evaluation Although a qualified NOE method could not be performed on the liner plate in locations associated with degraded moisture barriers, the body of information included in this evaluation supports the conclusion that the inaccessible portions of the liner plate have not experienced any appreciable loss of material that would compromise the liner plate's ability to perform its specified design function.
The following summarizes the information that supports the conclusion that the liner plate has maintained its ability to perform its specified design function. The qualitative visual inspections showed no significant degradation of the liner plate.
- Rate of corrosion is minimal.
- In 2023, an ILRT was performed on the containment structure, and the test results showed that the containment structure was performing its specified design function.
- Examination results indicate that no appreciable corrosion has occurred since the last ILRT in 2008, and the observed water in the channels is consistent with historical leakage. Thus, the condition of the liner plate in 2008 is expected to be representative of the condition today. Accordingly, there is no reason to expect the liner plate to have degraded to a point of loss of containment inteQritv.
Page 2 of 4
TABLE 1 ITEMS WITH FLAWS OR RELEVANT CONDITIONS THAT REQUIRED EVALUATION FOR CONTINUED SERVICE Examination Category and Item Description Evaluation Description Item Number
- Based on the chemical comparison performed, the leakage source is unlikely to be groundwater. Additionally, the observed high pH is indicative of a low corrosive environment.
- A minimum liner wall thickness of 1 /8" is acceptable.
Considering conservative total corrosion based on the observed chemistry from the water samples, the liner wall thickness is greater than the minimum. Therefore, there is no unacceptable effect on the structural integrity of the containment.
In summary, based on the examinations, chemistry analysis, design, corrosion assessment, and OE from other plants, reasonable assurance exists to conclude that the liner has maintained the ability to perform its specified design function and that the liner plate is capable of performing its specified design function for the following operating cycle.
E-A Moisture Barrier AR02454594, AR02454650 & AR02455440, AR02454877 (CTMT E1.30 Liner Liner)
E1.11 Items Identified Chipped, scratched paint, minor surface pitting, and mechanically induced impact areas were identified on liner and penetrations.
Light surface corrosion was observed, but no deformed metal or measurable wall loss was identified. Also, missing sections of the moisture barrier were observed and repaired, and a loose nut on the personnel airlock was tightened.
Engineering Evaluation The conditions identified do not impact the containment liner's pressure-retaining capacity or penetrations. The conditions noted are nonstructural and have no unacceptable effect on the containment's structural integrity or leak tightness.
Page 3 of 4
TABLE 2 ABSTRACT OF REPAIR/REPLACEMENT ACTIVITIES REQUIRED FOR CONTINUED SERVICE Code Item Description Date Repair/Replacement Class Description Of Work Completed Plan Number Installation of Flush Patch ND SW-1818-1-153-24" Code Repair for SW-1818-12/30/2022 40855718-08 1-153-24" Page 4 of 4