ENS 46716

v t e ENS Event
02:26 Apr 1, 2011
Title	Identified Unsealed Flood Barrier Penetrations
Event Description	During investigations of flood barrier penetrations, two approximately 4 inch conduits have been identified that are not sealed. These conduits penetrate the south wall of the auxiliary building near the transformers into room 19. Flooding through the penetrations could have impacted the ability of the station's auxiliary feedwater (AFW) pumps to perform their design accident mitigation functions. This eight-hour notification is being made pursuant to 10 CFR 50.72 (b)(3)(v). The penetrations are at an approximate elevation of 1007 [feet]. The river level has been less than 997 feet Mean Sea Level (MSL) since prior to December 1, 2010. The AFW pumps are operable. There are not any indications of conditions that might result in a flood. Actions are in progress to plug the penetrations. The NRC Resident Inspector has been notified.

ENS 46716 +/-
Where
Fort Calhoun Nebraska (NRC Region 4)
Reporting

10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Time - Person (Reporting Time:+-2.9 h-0.121 days <br />-0.0173 weeks <br />-0.00397 months <br />)
Opened:	Amy Burkhart 23:32 Mar 31, 2011
NRC Officer:	Dong Park
Last Updated:	Mar 31, 2011
46716 - NRC Website
v • d • e

v t e Emergency Notification System
Fort Calhoun with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
WEEKMONTHYEAR2016-08-25T20:23:00 [Table view]
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