ENS 50943

v t e ENS Event
20:09 Mar 31, 2015
Title	Unanalyzed Condition Due to Degraded Torus Coating
Event Description	The issue described in this report was addressed during the station's most recent refueling and maintenance outage in October of 2014 and no longer exists. During an inspection of Suppression Pool (torus) during the October 2014 outage, degradation of the torus coating was discovered. Some of the coating had become delaminated. NextEra Energy DAEC [Duane Arnold Energy Center] took immediate action to restore the coating to within design parameters during the refueling outage and the degraded condition no longer exists. Extensive analysis was performed to determine effect of the delaminated material. Upon completion of this investigation, NextEra Energy DAEC has determined an unanalyzed condition existed as a result of the coating degradation and is reporting the condition under 10 CFR 50.72(b)(3)(ii)(B). A root cause evaluation has been performed to determine causes and corrective actions. The NRC Resident Inspector has been notified.

ENS 50943 +/-
Where
Duane Arnold Iowa (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
LER:	05000331/LER-2015-002 Regarding Unanalyzed Condition Due to Degraded Primary Containment Suppression Pool Coating
Time - Person (Reporting Time:+-1.67 h-0.0696 days <br />-0.00994 weeks <br />-0.00229 months <br />)
Opened:	Hans Olson 18:29 Mar 31, 2015
NRC Officer:	Jeff Herrera
Last Updated:	Mar 31, 2015
50943 - NRC Website Loading map...
v • d • e

v t e Emergency Notification System
Duane Arnold with 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
WEEKMONTHYEAR2015-03-31T20:09:00 [Table view]
[ENS list for Duane Arnold]

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