ENS 43945

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v t e ENS Event
17:20 Jan 30, 2008
Title	Auxiliary Feedwater Pumps Declared Inoperable Based on Postulated Main Feedwater Line Break Scenario
Event Description	On 01/30/08, it was discovered that restrictor plates were not installed as required in the Unit 1 and Unit 2 interior doghouse floor drains. The restrictor plates are indicated as required on applicable flow diagrams. The purpose of the plates is to limit the amount of flow into the interior doghouse floor drains following a Main Feedwater (MFW) line break event in the doghouse. Without the restrictor plates installed, the amount of flow into the floor drains following a MFW line break could overwhelm the capability of the floor drain pump. Water could then flood into the AFW pump rooms and could render all three AFW pumps on the affected unit inoperable. Operations declared the 3 AFW pumps on both Units inoperable at 1220 today. TS 3.7.5.D states that with 3 AFW trains inoperable, LCO 3.0.3 and all other LCO required actions requiring Mode changes are suspended until on AFW train is restored to operable status. Both Units will remain at 100% power until repairs are complete. This condition does not prevent the AFW pumps from starting on an automatic or manual signal for any required plant events. An investigation into how this condition occurred is underway. As a result of this discovery, all three AFW pumps on each unit have been declared inoperable. Plant personnel are currently in the process of fabricating the required restrictor plates or blind flanges as necessary and installing them to conform to the drawing requirements. The restrictor plates/blind flanges are being installed and upon completion the affected AFW pumps will be considered operable. The licensee notified the NRC Resident Inspector. State and local government agencies will also be notified by the licensee.

ENS 43945 +/-
Where
Catawba South Carolina (NRC Region 2)
Reporting

10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Time - Person (Reporting Time:+0.53 h0.0221 days <br />0.00315 weeks <br />7.25994e-4 months <br />)
Opened:	Walter Hunnicutt 17:52 Jan 30, 2008
NRC Officer:	Bill Huffman
Last Updated:	Jan 30, 2008
43945 - NRC Website Loading map... {"minzoom":false,"maxzoom":false,"mappingservice":"leaflet","width":"350px","height":"250px","centre":false,"title":"","label":"","icon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"zoom":6,"defzoom":14,"layers":["OpenStreetMap"],"image layers":[],"overlays":[],"resizable":false,"fullscreen":false,"scrollwheelzoom":true,"cluster":false,"clustermaxzoom":20,"clusterzoomonclick":true,"clustermaxradius":80,"clusterspiderfy":true,"geojson":"","clicktarget":"","imageLayers":[],"locations":[{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca class=\"mw-selflink selflink\"\u003EENS 43945\u003C/a\u003E - \u003Ca href=\"/Catawba\" title=\"Catawba\"\u003ECatawba\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EAuxiliary Feedwater Pumps Declared Inoperable Based on Postulated Main Feedwater Line Break Scenario\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 43945 - Catawba\n","link":"","lat":35.05162222222222,"lon":-81.06938055555555,"icon":"/w/images/7/75/Duke_Energy_icon.png"}],"imageoverlays":null}
v • d • e

v t e Emergency Notification System
Catawba with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
WEEKMONTHYEAR2019-08-18T21:00:00 [Table view]
[ENS list for Catawba]

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