L-2024-141, Third Supplement to NextEra Energy Seabrook, LLC, Letter L-2024-108, Response to Request for Additional Information (RAI) Regarding One Time Extension to Technical Specification 3.8.1.1.a, Allowed Outage Time with One Independent Circuit
| ML24228A119 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 08/15/2024 |
| From: | Rasmus P NextEra Energy Seabrook |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| L-2024-141 | |
| Download: ML24228A119 (1) | |
Text
NEXTera' EN~
U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington DC 20555-0001 RE:
Seabrook Station Docket No. 50-443 Renewed Facility Operating License No. NPF-86 August 15, 2024 L-2024-141 10 CFR 50.90 Third Supplement to NextEra Energy Seabrook, LLC, Letter L-2024-108, "Response to Request for Additional Information (RAI) Regarding One Time Extension to Technical Specification 3.8.1.1.a, Allowed Outage Time with One Independent Circuit Between the Offsite Transmission Network and the Onsite Class 1 E Distribution System Out-of-Service,"
March 4, 2024 (ADAMS Accession No. ML24198A026)
References:
- 1.
NextEra Energy Seabrook, LLC, Letter L-2024-061, "License Amendment Request a One Time Extension to Technical Specification 3.8.1.1.a, Allowed Outage Time with One Independent Circuit Between the Offsite Transmission Network and the Onsite Class 1 E Distribution System Out-of-Service," May 24, 2024 (ADAMS Accession No. ML24131A152)
- 2.
NRC Electronic Memorandum dated June 25, 2024, Request for Additional Information (RAI)
- Seabrook LAR offsite power, Regarding the One Time License Amendment Request to Revise Technical Specification 3.8.1, Offsite Sources - Operating," Seabrook Station, Unit 1, Docket No. 50-443
- 3.
NextEra Energy Seabrook, LLC, Letter L-2024-108, "Response to Request for Additional Information (RAI) Regarding One Time Extension to Technical Specification 3.8.1.1.a, Allowed Outage Time with One Independent Circuit Between the Offsite Transmission Network and the Onsite Class 1 E Distribution System Out-of-Service," July 16, 2024 (ADAMS Accession No. ML24198A026)
- 4.
NextEra Energy Seabrook, LLC, Letter L-2024-127, "Supplement to NextEra Energy Seabrook, LLC, Letter L-2024-108, "Response to Request for Additional Information (RAI)
Regarding One Time Extension to Technical Specification 3.8.1.1.a, Allowed Outage Time with One Independent Circuit Between the Offsite Transmission Network and the Onsite Class 1 E Distribution System Out-of-Service," August 5, 2024 (ADAMS Accession No.
M L24219A036)
- 5.
NextEra Energy Seabrook, LLC, Letter L-2024-137, "Second Supplement to NextEra Energy Seabrook, LLC, Letter L-2024-108, Response to Request for Additional Information (RAI)
Regarding One Time Extension to Technical Specification 3.8.1.1.a, Allowed Outage Time with One Independent Circuit Between the Offsite Transmission Network and the Onsite Class 1 E Distribution System Out-of-Service," August 12, 2024 (ADAMs Accession No. ML24225A265)
NextEra Energy Seabrook, LLC P.O. Box 300, Lafayette Road, Seabrook, NH 03874
Seabrook Station Docket No. 50-443 L-2024-141 Page 2 of 3 In Reference 1, NextEra Energy Seabrook, LLC (NextEra) requested, pursuant to 10 CFR 50.90, a one-time License Amendment to Renewed Facility Operating License NFP-86 for Seabrook Nuclear Plant Unit 1 (Seabrook).
In Reference 2, the NRC staff forwarded Requests for Additional Information (RAls) deemed necessary to complete its review. A clarification call was held with the staff, on June 25, 2024, and in Reference 3, NextEra provided a response to the RAls. In References 4 and 5, NextEra provided supplemental information which clarified the responses provided in Reference 3. to this submittal summarizes the compensatory measures that will be implemented during the requested AOT extension previously identified in the above referenced letters. to this submittal provides a revised TS 3.8.1.1.a markup page associated with this amendment request. The revised markup supersedes and replaces the corresponding TS 3.8.1.1.a markup page provided in Reference 1.
The information included in this Reference 1 supplement provides additional information that clarifies the application, does not expand the scope of the application as originally noted, and should not change the NRC staffs originally proposed no significant hazards consideration determination as published by the Federal Registered.
This letter contains no new or revised regulatory commitments.
Should you have any questions regarding this submission, please contact Mr. Kenneth Mack, Senior Manager, Licensing and Regulatory Compliance, at 561 -904-3635.
I declare under penalty of perjury that the foregoing is true and correct.
Executed on the 15th day of August 2024.
Sincerely,
/'f 111n...------
Paul Rasmus General Manager, Regulatory Affairs Enclosures
- 1. Seabrook Third Supplemental Response to RAI Questions
- 2. Proposed Technical Specification Page Markup
Seabrook Station Docket No. 50-443 cc:
USNRC Region I Administrator USNRC Project Manager USNRC Senior Resident Inspector Director Homeland Security and Emergency Management New Hampshire Department of Safety Division of Homeland Security and Emergency Management Bureau of Emergency Management 33 Hazen Drive Concord, NH 03305 Kimberly A Castle, Technological Hazards Unit Supervisor The Commonwealth of Massachusetts Emergency Management Agency 400 Worcester Road Framingham, MA 01702-5399 L-2024-141 Page 3 of 3
Seabrook Station Docket Nos. 50-443 ENCLOSURE 1 SEABROOK THIRD SUPPLEMENTAL RESPONSE TO RAI QUESTIONS (One Page Follows)
Seabrook Station Docket No. 50-443 ENCLOSURE 1 SEABROOK TS 3.8.1.1.AAOT LAR COMPENSATORY MEASURES L-2024-141 Page 1 of 1 The extended Allowed Outage Time (AOT) requested by the amendment only allows operation, with the redundant offsite power source inoperable, in MODES 3 and 4, and in MODE 2 for the duration of low-power physics testing.
Operations will perform a Senior Reactor Operator (SRO) walkdown of all guarded equipment once per shift as follows:
Both Emergency Diesel Generators (EGDs)
Supplemental Emergency Power System (SEPS)
Seabrook's 345kV Switchyard Breaker Enclosure Building 3A and 38 Reserve Auxiliary Transformers (RATs)
Seabrook's Relay Room Steam Driven EFW Pump when testing is complete in accordance with TS 4.7.1.2.b.2 and TS 4.7.1.2.2 Risk significant configurations will be avoided in order to preserve safety margins and defense-in-depth strategies.
At least two of the independent transmission lines will be aligned to the RATs during breaker replacement.
The Station will be in contact with the load dispatcher in order to stay apprised of any potential grid perturbations or of any switching that might be necessary.
Switchyard activities and offsite transmission activities will be limited to emergency work or work necessary to restore the Unit Auxiliary Transformers (UATs).
Seabrook will perform the following compensatory actions in preparation for the extended AOT prior to transitioning from MODE 5 to MODE 4:
Verify that an ISO-NE transmission request is in place requesting to limit maintenance on the offsite transmission lines to emergencies only Verify shutdown power availability risk is GREEN in accordance with SM7.31 Verify SEPs is aligned to bus 6 to provide a redundant power source for the motor driven EFWpump Verify no severe weather is forecasted in the next 2 days Verify that electrical FLEX equipment is staged in the Service Water pumphouse once per shift Maintenance and testing activities will be controlled by existing Technical Specification requirements and approved procedures during the approved extended AOT.
Seabrook Station Docket Nos. 50-443 ENCLOSURE 2 SEABROOK PROPOSED TECHNICAL SPECIFICATION PAGE MARKUP (One Page Follows)
ELECTRICAL POWER SYSTEMS AC. SOURCES OPERATING LIMITING CONDITION FOR OPERATION 3.8.1.1 (Continued)
ACTION:
- 3. Restore at least two offsite circuits to OPERABLE status within 72* hours 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 />.
Unit 240 hours0.00278 days <br />0.0667 hours <br />3.968254e-4 weeks <br />9.132e-5 months <br /> ed ~
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- A one-time Allowable Outag~Vnme (AOT) extension for ad'inoperable offsite circuit allows ~
to restore the inoperable 38 Reserve Auxiliary Transformer% OPERABLE status. Compensatory measures within NextEra Energy Seabrook, LLC letter L 2024 038 dated March 8, 202~1 be implemented and shall remain in effect during the extended AOT period. The one-time\\ ~.9.:'-~
extension shall expire upon completion of the maintenance to restore the 38 Reserve Auxilia~ 02 1-~~\\~~~ed Trans~ r~
to OPERABLE status or by O, n MaFch 31, 2024, wh~
r occurs earrest.
gus SEABROOK - UNIT 1 24o hours 3/4 8-1a Unit mendment No. 1-7\\:
If the 240-hour one-time allowance has not been fully utilized, by November 30, 17 4
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