ENS 57001
ENS Event | |
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05:00 Aug 27, 2022 | |
Title | Part 21 - Service Water Booster Pump Bearing Housing Cover Oil Leak |
Event Description | 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. |
Where | |
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Cooper Nuclear Station Brownville, Nebraska (NRC Region 4) | |
Organization: | Cooper Nuclear Station |
Reporting | |
10 CFR 21.21(d)(3)(i), Failure to Comply or Defect | |
Time - Person (Reporting Time:+13255.83 h552.326 days <br />78.904 weeks <br />18.158 months <br />) | |
Opened: | Linda Dewhirst 13:50 Mar 1, 2024 |
NRC Officer: | Sam Colvard |
Last Updated: | Mar 1, 2024 |
57001 - NRC Website
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WEEKMONTHYEARENS 570012022-08-27T05:00:00027 August 2022 05:00:00
[Table view]10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 - Service Water Booster Pump Bearing Housing Cover Oil Leak ENS 529342016-04-26T02:17:00026 April 2016 02:17:00 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect Part 21 Report - Relay Failure Due to Open Coil 2022-08-27T05:00:00 | |