05000259/LER-2023-001, High Pressure Coolant Injection System Inoperable Due to a Torn Valve Diaphragm
| ML23086C092 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 03/27/2023 |
| From: | Sivaraman M Tennessee Valley Authority |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| LER 2023-001-00 | |
| Download: ML23086C092 (1) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(v), Loss of Safety Function |
| 2592023001R00 - NRC Website | |
text
Post Office Box 2000, Decatur, Alabama 35609-2000 March 27, 2023 10 CFR 50.73 10 CFR 50.4(a)
ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 Browns Ferry Nuclear Plant, Unit 1 Renewed Facility Operating License No. DPR-33 NRC Docket No. 50-259
Subject:
Licensee Event Report 50-259/2023-001 High Pressure Coolant Injection System Inoperable Due to a Torn Valve Diaphragm
Reference:
Non-Emergency Event Notification 56321 - High Pressure Coolant Injection Inoperable The enclosed Licensee Event Report provides details of a failed diaphragm which resulted in the inoperability of the High Pressure Coolant Injection system. The Tennessee Valley Authority (TVA) is submitting this report in accordance with Title 10 of the Code of Federal Regulations (10 CFR) 50.73(a)(2)(v)(D), as any event or condition that could have prevented the fulfillment of the safety function of structures or systems that are needed to mitigate the consequences of an accident.
There will be a supplement to this Licensee Event Report to provide additional time to complete the apparent cause evaluation.
There are no new regulatory commitments contained in this letter. Should you have any questions concerning this submittal, please contact Chris L. Vaughn, Site Licensing Manager, at (256) 729-2636.
Respectfully, Manu Sivaraman Site Vice President 1\\14 TENNESSEE VALLEY AUTHORITY
U.S. Nuclear Regulatory Commission Page 2 March 27, 2023
Enclosure:
Licensee Event Report 50-259/2023-001 High Pressure Coolant Injection System Inoperable Due to a Torn Valve Diaphragm cc (w/ Enclosure):
NRC Regional Administrator - Region II NRC Senior Resident Inspector - Browns Ferry Nuclear Plant NRC Project Manager - Browns Ferry Nuclear Plant
Abstract
On January 24, 2023 at 0121 CST, the Browns Ferry Nuclear Plant, Unit 1, High Pressure Coolant Injection (HPCI) was declared inoperable because the normally-open HPCI Steam Line Condensate Outboard Drain Valve failed closed, apparently due to a failed diaphragm. On January 24, 2022, at 0743 CST, eight-hour Event Notification 56321 was made to the NRC.
The Tennessee Valley Authority (TVA) is submitting this report in accordance with Title 10 of the Code of Federal Regulations (10 CFR) 50.73(a)(2)(v)(D), as any event or condition that could have prevented the fulfillment of the safety function of structures or systems that are needed to mitigate the consequences of an accident.
The causal analysis and corrective actions will be reported later in a supplement to this LER.
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I Page 5 of 5 C. For failure that rendered a train of a safety system inoperable, estimate of the elapsed time from discovery of the failure until the train was returned to service HPCI was inoperable from the time of discovery on January 24, 2023, 0121 CST until the diaphragm was replaced and its associated PMT was completed on January 25, 2023, 0215 CST. The BFN, Unit 1, HPCI system was inoperable for approximately one (1) day.
VI.
Corrective Actions
Corrective Actions are being managed by the TVAs corrective action program under Condition Report (CR) 1830955.
A. Immediate Corrective Actions
The diaphragm was replaced under WO 123430246.
B. Corrective Actions to Prevent Recurrence or to reduce the probability of similar events occurring in the future The corrective actions will be reported later in a supplement to this LER.
VII. Previous Similar Events at the Same Site
A search of LERs from BFN, Units 1, 2, and 3 over the last five years identified no similar events.
VIII. Additional Information
There is no additional information.
IX.
Commitments
There are no new commitments.