ENS 50943
ENS Event | |
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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. |
Where | |
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Duane Arnold ![]() Iowa (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
LER: | 05000331/LER-2015-002 |
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
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Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 509432015-03-31T20:09:00031 March 2015 20:09:00
[Table view]10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Due to Degraded Torus Coating ENS 424792006-04-05T23:55:0005 April 2006 23:55:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Abnormal Operating Procedure (Aop) for Station Blackout Could Not Be Performed in Specified Time Period ENS 420882005-10-27T18:28:00027 October 2005 18:28:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition ENS 417422005-06-02T23:49:0002 June 2005 23:49:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Appendix R Assessment on Remote Shutdown Panel 2015-03-31T20:09:00 | |