ENS 50519

v t e ENS Event
15:35 Oct 8, 2014
Title	Potential Fire Induced Cable Failure in Multiple Fire Zones
Event Description	INPO-IER-L4-14-33 (Direct Current Circuits Challenge Appendix R Fire Analysis) was reviewed to determine applicability to ANO Unit 1 & 2. It was determined that 2P-21, Turbine Generator Emergency Seal Oil Pump, control cables are not fused and are routed through multiple fire zones containing safe shutdown equipment. A potential fire induced cable failure in any of these fire zones could result in a secondary fire or damage adjacent cables along the path of the unprotected cable. The concern is that under fire safe shutdown conditions, it is postulated that a fire in one zone can cause short circuits potentially resulting in secondary fires or cable failures in other fire zones where the cables are routed. The secondary fires or cable failures are outside the assumptions of the 10 CFR 50 Appendix R Safe Shutdown Analysis. This condition is reportable as an 8-hour ENS report in accordance with 10 CFR 50.72(b)(3)(ii)(B) as an unanalyzed condition. Compensatory measures (fire watches) have been implemented for affected zones of the plant. The NRC Resident Inspector has been notified.

ENS 50519 +/-
Where
Arkansas Nuclear Arkansas (NRC Region 4)
Reporting
Emergency class:
10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
Time - Person (Reporting Time:+0.07 h0.00292 days <br />4.166667e-4 weeks <br />9.5886e-5 months <br />)
Opened:	Rex Knight 15:39 Oct 8, 2014
NRC Officer:	Dan Livermore
Last Updated:	Oct 8, 2014
50519 - NRC Website
v • d • e

v t e Emergency Notification System
Arkansas Nuclear with 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
WEEKMONTHYEAR2016-09-15T14:08:00 [Table view]
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