31 mars 2015
Durant l’arrêt d’octobre 2014, la dégradation du revêtement du tore a été découverte. Des morceaux d’enduits étaient décollés. Duane Arnold Energy Center a pris immédiatement des mesures de restauration du revêtement. Cette situation n’avait pas été envisagée.
Note : les données sont insuffisantes pour déterminer le niveau de risque encouru. A titre d’exemple, on ignore s’il existait un risque de bouchage des filtres de l’eau de refroidissement du réacteur.
Type : Fukushima I (BWR Mark 1) - Puissance : 1 912 MWTh - Première divergence : 03/1974
Available in english only.
Event Number : 50943
Facility : DUANE ARNOLD - State : IA
Unit : [1] - RX Type : [1] GE-4
Event Date : 03/31/2015 Event Time : 15:09
Last Update Date : 03/31/2015 Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
Initial PWR : 100 % Current PWR : 100 %
Event Text
UNANALYZED CONDITION DUE TO DEGRADED TORUS COATING
"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."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2015/20150401en.html
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