18 juin 2013
Lors du rechargement de combustible, il a été identifié des fissurations sur 4 buses de pénétration de la cuve du réacteur. Ces fissures sont susceptibles de créer une "brèche" primaire. Les quatre buses ont été réparées par soudure.
1ère divergence janvier 1987 - Type PWR - P : 900 MW
Available in english only.
Facility : HARRIS - State : NC - Unit : [1] - RX Type : [1] W-3-LP
Event Date : 04/27/2012 Event Time : 14:33 [EDT] Last Update Date : 06/18/2013 Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(ii)(A) - DEGRADED CONDITION
Initial PWR : 0 % Current PWR : 0 %
Event Text
REACTOR HEAD NOZZLE PENETRATION FLAWS IDENTIFIED "On April 27, 2012, while the Harris Nuclear Plant was shutdown for a scheduled refueling outage, the reactor vessel head penetrations were being examined in accordance with Inservice Inspection Program requirements. Examinations were being performed to identify flaws before they grow to a size that could effect the structural integrity of the reactor vessel. Those examinations identified flaws in four head penetration nozzles that exhibited characteristics of Primary Water Stress Corrosion Cracking. The four nozzles were repaired using the inner diameter temper bead welding process. Examinations performed following the repairs confirmed the repairs were successful.
"This was originally submitted as a voluntary report on May 29, 2012 at 1511 EDT. The condition has since been determined to be reportable per 10CFR50.72(b)(3)(ii)(A).
"The NRC Resident Inspector has been informed."
Event Number : 49131
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2013/20130620en.html
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