ML26048A155
| ML26048A155 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 03/01/2024 |
| From: | Dewhirst L Nebraska Public Power District (NPPD) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| EN 57001 | |
| Download: ML26048A155 (0) | |
Text
02-12-2026 07:03:41 U.S. Nuclear Regulatory Commission Operations Center Report 8
02-12-2026 07:03:41 U.S. Nuclear Regulatory Commission Operations Center Report Event #:
57001 Event Type:
Part 21 Reporting Org:
Cooper Nuclear Station Notify Date/Time:
2024-03-01 13:50 (EST)
Licensee:
Cooper Nuclear Station Event Date/Time:
2022-08-27 00:00 (CDT)
Modify Date/Time:
2024-03-01 14:14 Region:
4 City:
Brownville Agreement State:
Yes County:
Nemaha License #:
State:
NE Notified by:
Linda Dewhirst Notifications:
Warnick, Greg R4DO HOO:
Sam Colvard Part 21/50.55 Reactors, - EMAIL Emergency Class:
Non Emergency 10 CFR Sections:
21.21(d)(3)(i)
Defects And Noncompliance PART 21 - SERVICE WATER BOOSTER PUMP BEARING HOUSING COVER OIL LEAK The following information was provided by the licensee via phone and email:
"On August 27, 2022, while in Mode 1 at 100 percent power, Nebraska Public Power District (NPPD) Cooper Nuclear Station (CNS) identified a 3 drops per minute (dpm) oil leak from the radial (inboard) bearing housing cover on one of four residual heat removal (RHR) service water booster pumps (SWBP); specifically, SWBP-D.
"Subsequent analysis determined that the leak was a result of a deviation with the configuration of the labyrinth seal drain path. This deviation was due to an error introduced in a manufacturing drawing used by the vendor for the fabrication of four new replacement pumps. The bearing housing cover is a unique design to CNS for the RHR SWBPs.
"On March 1, 2024, NPPD completed a substantial safety hazard evaluation and determined that the manufacturing drawing error could cause a substantial safety hazard. The NRC Resident Senior Resident has been notified. This is a non-emergency notification required by 10 CFR 21.21(d)(3)(i). A written notification will be provided within 30 days."
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
All four SWBPs had a similar housing design. Three of the four pump housings have been replaced. No other nuclear plant is affected due to the housing design being unique to CNS.
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