24 mars 2012
Richard Zuercher, un porte-parole pour les opérations nucléaires Dominion, a déclaré lundi que deux petites fissures ont été découvertes à un point de soudure où les tuyaux de deux différents types d’acier ont été connectés. Cette centrale a subi le tremblement de terre historique le 23 aout 2011 ( magnitude 5.8) : les fissures proviennent probablement de cette date.
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Degradation of steam generator nozzle weld areas
On March 24, 2012, at 1855 [EDT] during the performance of work activities to support Alloy 600 dissimilar metal weld overlay work on the ’B’ Reactor Coolant loop hot leg to the ’B’ Steam Generator nozzle weld, two through-wall defects were identified. The workers noted a small amount of water seeping from the indications in the nozzle weld area. The indications are in the area of excavation that was being performed for the weld overlay project. Approximately 1 [inch] of weld material had been removed prior to the seepage being identified.
"Entered Technical Requirement 3.4 .6, ’ASME Code Class 1, 2 and 3 Components’ and immediately initiated actions to isolate the ’B’ Reactor Coolant loop. The ’B’ Reactor Coolant loop stop valves were closed at 2312 hours on March 24, 2012, which isolated the defects from the reactor coolant system . An engineering evaluation of the defects will be performed and corrective actions implemented.
"This event is reportable in accordance to 10CFR50.72(b)(3)(ii)(A) for ’any event or condition that results in the condition of the nuclear power plant, including its principle safety barriers, being seriously degraded’."
The licensee notified the NRC Resident Inspector and will notify Louisa County.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2012/20120326en.html
Nouveau contrôle suite à un autre séisme
UNUSUAL EVENT DECLARED DUE TO SEISMIC ACTIVITY https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2012/20120327en.{html
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