26 janvier 2018
Une visite a été lancée pour déterminer l’origine de la fuite qui a entrainé une sérieuse dégradation de barrière de sécurité. La fuite a été repérée sur une tuyauterie, à 8 h 53, ce qui a engagé l’entrée dans la procédure technique qui fixe la limitation de fonctionnement des réacteurs et qui impose leur arrêt sous 6 heures. La fuite aurait été isolée 1 h 22 après sa découverte, ce qui aurait fait sortir les réacteurs des conditions de limitation de leur utilisation. Le plan de réparation est en cours d’élaboration.
Type : PWR - Puissance : 1 775 MWth - Première divergence : 11 / 1969 -
Available in english only
Event Number : 53185
Facility : GINNA - State : NY Unit : [1] - RX Type : [1] W-2-LP
Event Date : 01/26/2018 - Event Time : 08:53 [EST]
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(ii)(A) - DEGRADED CONDITION
Initial PWR n° 1 : 100 % - n°2 : 100 % Current PWR n° 1 : 100 % - n°2 : 100 %
Event Text
REACTOR COOLANT SYSTEM OPERATIONAL LEAKAGE
"On January 26, 2018, a containment entry was made to identify the source of elevated Unidentified Reactor Coolant System (RCS) operational leakage. A through-wall leak was identified on a Class 1 piping weld on the letdown line at 0853 EST. It was determined that the leak was RCS pressure boundary leakage. Ginna entered Technical Specification (TS) LCO [Limiting Condition for Operation] 3.4.13, RCS Operational Leakage, Condition B. for the existence of pressure boundary leakage. This condition requires the plant to be in MODE 3 within 6 hours and MODE 5 within 36 hours. The leak was isolated and TS LCO 3.4.13 exited at 1015 EST.
"This event is reportable within 8 hours in accordance with 10CFR50.72(b)(3)(ii)(A) for ’Any event or condition that results in : (A) The condition of the nuclear power plant, including its principal safety barriers, being seriously degraded’.
"The Station [Ginna] is developing an evaluation and a repair plan at this time.
"This condition has no impact on public health and safety.
"The licensee has informed the NRC Resident Inspector."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2018/20180129en.html