7 octobre 2014
La sortie des critères de fonctionnement correct a découverte sur le réacteur n° 2. Les contrôles se poursuivent et l’étude pour la réparation du problème avant redémarrage du réacteur est en cours.
Type : PWR - Puissance : 3 586,6 - Première divergence : 01/1987
Available in english only.
Event Number : 50517
Facility : BYRON - State : IL -
Unit : [2] - RX Type : [2] W-4-LP
Event Date : 10/07/2014 - Event Time : 19:00 -
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(ii)(A) - DEGRADED CONDITION Person (Organization) : ROBERT ORLIKOWSKI (R3DO)
Initial PWR : 0 % Current PWR : 0 %
Event Text
ULTRASONIC TESTING REVEAL DEGRADED CONDITION ON ONE CONTROL ROD DRIVE MECHANISM PENETRATION
"In accordance with 10 CFR 50.72(b)(3)(ii)(A), this notification reports a degraded condition on Byron Station Unit 2 that occurred on October 7, 2014, when it was determined that the results of planned ultrasonic testing (UT) examinations performed on one CRDM penetration of the reactor vessel head would not meet the applicable acceptance criteria. Byron Station Unit 2 is presently in day eight of a refueling outage. The examinations were being performed to meet the requirements of 10 CFR 50.55a(g)(6)(ii)(D) and ASME Code Case N-729-1 to ensure the structural integrity of the reactor vessel head pressure boundary. The UT examinations continue for the remaining CRDM head penetrations. The repairs are currently being planned and will be completed prior to unit start-up.
"The NRC Resident Inspector has been notified of this condition."
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