23 octobre 2017
Même si le niveau de fuite de liquide primaire n’a pu être quantifié à l’observation de la soudure, avant l’arrêt du réacteur, ce taux était de 41 litre par heure sur cette soudure de piquage de 2,54 cm de diamètre. Cette déclaration est faite suite à la dégradation sérieuse de la seconde barrière de confinement du réacteur.
Type : Fukushima 1 (BWR-Mark 1) - Puissance : 3 514 MWth - Première divergence : 8 / 1974 -
Available in english only
Event Number : 53031
Facility : PEACH BOTTOM - State : PA -
Unit : [3] - RX Type : [3] GE-4
Event Date : 10/23/2017 - Event Time : 04:00 [EDT]
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(ii)(A) - DEGRADED CONDITION
Initial PWR : 0 % - Current PWR : 0 %
Event Text LEAKAGE IDENTIFIED ON ONE INCH LINE SOCKET WELD FOR THE B RECIRCULATION PUMP
"On Monday, October 23, 2017, with PBAPS [Peach Bottom Atomic Power Station] Unit 3 in Mode 3 at the beginning of a refueling outage, personnel entered the drywell to perform an inspection. At approximately 0400 [EDT], leakage was identified on a one-inch diameter instrument line socket weld for the ’B’ recirculation pump. Because the leak was misting, the leakage rate could not be quantified. However, Unit 3 reactor coolant unidentified leakage prior to plant shutdown was 0.18 gpm. This line is considered part of the primary coolant pressure boundary.
"This event is being reported as an occurrence of an event or condition that results in the condition of the nuclear power plant, including its principal safety barriers being seriously degraded under 10 CFR 50.72(b)(3)(ii).
"The Station is preparing an evaluation and repair plan at this time.
"The NRC Resident Inspector has been notified."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2017/20171024en.html
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