05000260/LER-2024-001, Secondary Containment Isolation Valve Inoperable Due to Mechanical Failure
| ML24047A222 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 02/16/2024 |
| From: | Sivaraman M Tennessee Valley Authority |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| LER 2024-001-00 | |
| Download: ML24047A222 (1) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 2602024001R00 - NRC Website | |
text
Post Office Box 2000, Decatur, Alabama 35609-2000 February 16, 2024 10 CFR 50.73 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 Browns Ferry Nuclear Plant, Unit 2 Renewed Facility Operating License No. DPR-52 NRC Docket No. 50-260
Subject:
Licensee Event Report 50-260/2024-001-00 The enclosed Licensee Event Report provides details of a failed Secondary Containment Isolation Valve on Browns Ferry Nuclear Plant, Unit 2. The Tennessee Valley Authority is submitting this report in accordance with Title 10 of the Code of Federal Regulations (10 CFR) 50.73(a)(2)(i)(B), as any operation or condition which was prohibited by the plants Technical Specifications.
There will be a supplement to this Licensee Event Report to provide additional time to complete the root cause evaluation.
There are no new regulatory commitments contained in this letter. Should you have any questions concerning this submittal, please contact David J. Renn, Nuclear Site Licensing Manager, at (256) 729-2636.
Respectfully, Manu Sivaraman Site Vice President Enclosure: Licensee Event Report 50-260/2024-001 Secondary Containment Isolation Valve Inoperable due to Mechanical Failure cc (w/ Enclosure):
NRC Regional Administrator - Region II NRC Senior Resident Inspector - Browns Ferry Nuclear Plant NRC Project Manager - Browns Ferry Nuclear Plant
ENCLOSURE Browns Ferry Nuclear Plant Unit 2 Licensee Event Report 50-260/2024-001-00 Secondary Containment Isolation Valve Inoperable due to Mechanical Failure See Enclosed
Abstract
On November 18, 2023, at approximately 2038 Central Standard Time, Reactor Zone Outboard Supply Damper 2-DMP-064-0013 failed to close upon securing Reactor Zone Supply Fans. Operations personnel declared 2-DMP-064-0013 inoperable for SCIV function and entered Technical Specification Limiting Condition for Operation 3.6.4.2 Condition A. On November 22, 2023, 1515 CST, following a Temporary Modification to the damper, Operations personnel declared damper 2-DMP-064-0013 operable for SCIV function and exited TS LCO 3.6.4.2 Condition A. On December 18, 2023, a Past Operability Evaluation determined that the damper had been inoperable for longer than allowed by TS. This condition did not result in any loss of safety function.
There will be a supplement to this Licensee Event Report to provide additional time to complete the cause evaluation.
Page 6 of 6 VI.
Corrective Actions
Corrective Actions are being managed by the TVAs corrective action program under CR 1893273.
A. Immediate Corrective Actions
A temporary modification was implemented to pin the lower louvers closed until the valve is repaired.
B. Corrective Actions to Prevent Recurrence or to reduce the probability of similar events occurring in the future There will be a supplement to this Licensee Event Report to provide additional time to complete the cause evaluation.
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.