05000443/LER-2023-005, Auxiliary Feedwater System Inoperable
| ML23354A067 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 12/20/2023 |
| From: | Strand D NextEra Energy Seabrook |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| L-2023-171 LER 2023-05-00 | |
| Download: ML23354A067 (1) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(v)(B), Loss of Safety Function - Remove Residual Heat |
| 4432023005R00 - NRC Website | |
text
December 20, 2023 Attention: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 Seabrook Station Docket No. 50-443 Reportable Event: 2023-05-00 Date of Event: November 7, 2023
Subject:
Auxiliary Feedwater System Inoperable L-2023-171 10 CFR 50.73 The attached Licensee Event Report 2023-05-00 is being submitted pursuant to the requirements of 10 CFR 50.73 to provide notification of the subject event. If you have any questions, please contact Mr. Kenneth Mack, Fleet Licensing Manager, at 561-904-3635.
Respectfully,
- 1) \\.---- -s '~
Dianne Strand General Manager Regulatory Affairs N extEra Energy Attachment cc:
Seabrook Station NRC Senior Resident Inspector Seabrook Station NRC Project Manager
Abstract
Docket Number Facility Name Docket Number
- 9.
Seabrook Station
00443 3
Auxiliary Feedwater System Inoperable 11 07 2023 2023 05 0
12 20 2023 MODE 1 100
Sheryl Sweet, Licensing Engineer 561-904-3793 X
ED XFMR Q120 Y
On November 07, 2023, during normal operation, Seabrook Station declared the Auxiliary Feedwater System inoperable because control power to the 'B' train Emergency Feedwater (EFW) flow control valve, which supplies the 'D' Steam Generator (SG), was lost. The 'B' transformer providing control power to the EFW circuit was identified as the failure mechanism. Failure of any of the eight EFW flow control valves to meet its Surveillance Requirements will render all EFW pumps inoperable per Technical Specifications.
This event is reportable in accordance with 10 CFR 50.73(a)(2)(v)(B) as any event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to remove residual heat.Page of
- 3. LER NUMBER YEAR SEQUENTIAL NUMBER REV NO.
052 050 Failed Component:
Gould ITE Machine Tool Transformer, 0.100 kVA 480/120V Safety System Functional Failure Consideration:
This event required reporting under the criterion of 10 CFR 50.73(a)(2)(v)(B) because of the failure to meet the TS SR.
However system redundancy preserved the EFW system safety functions. Consequently, this event will not be included in the Station's Performance Indicator (PI) reporting in accordance with NEI 99-02.
Similar Events
Seabrook Station has experienced no similar events in the past three years.
3 3
Seabrook Station 00443 2023 5
0