ENS 48847
ENS Event | |
|---|---|
03:18 Mar 24, 2013 | |
| Title | Switchgear Room Degraded Flood Seals |
| Event Description | On 3/23/13 it was identified that a conduit flood seal between an outside manhole and the switchgear rooms is displaced. This degraded flood seal compromises the flooding design of both the East and West Switchgear Rooms.
Compensatory measures were implemented for the flood seal in accordance with the plants barrier control process. Repairs of the seal are in progress. Per the licensee these switchgear rooms contain both normal and safety related 4kV and 480 V electrical boards. Compensatory measures implemented include: Plant Maintenance personnel will take actions to seal any leak within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of a flooding event and also provide sump pumps to remove any water that has leaked in. The licensee notified the NRC Resident Inspector and the Vermont State Liaison.
This is an update to NRC Event 48847 reported on 3/24/13 at 1316 [EDT]. On 3/27/2013 the extent of condition review identified two additional possible water intrusion paths from the outside to the switchgear rooms. Compensatory measures were implemented for these paths in accordance with plant procedures. Efforts to seal these paths are in progress. This is an on-going extent of condition assessment. The licensee will inform the NRC Resident Inspector and the Vermont State Liaison. Notified R1DO (Krohn). |
| Where | |
|---|---|
| Vermont Yankee File:NorthStar Vermont Yankee icon.png Vermont (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+9.97 h0.415 days <br />0.0593 weeks <br />0.0137 months <br />) | |
| Opened: | Andrew Wisniewski 13:16 Mar 24, 2013 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Mar 28, 2013 |
| 48847 - NRC Website
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