30 octobre 2017
Ce problème a été découvert pendant la phase de rechargement de "combustible" lors d’une inspection dans la zone contrôlée. Selon la NRC, cette partie de circuit serait isolable.
Type : PWR - Puissance : 1 800 MWth - Première divergence : 11 / 1970 -
Available in english only
Event Number : 53042
Facility : POINT BEACH - State : WI
Unit : [1] - RX Type : [1] W-2-LP
Event Date : 10/30/2017 - Event Time : 04:04 [CDT]
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(ii)(A) - DEGRADED CONDITION
Initial PWR : 0 % Current PWR : 0 %
Event Text DEFECTIVE WELD IDENTIFIED ON REACTOR COOLANT PUMP SEAL UPPER ROOT
"During a scheduled refueling outage, an inspection of components inside containment revealed a suspected weld defect on 1CV-309B, 1P-1B RCP Labyrinth Seal 1PT-124 Upper Root.
"10 CFR 50.2 (2)(i) defines the reactor coolant pressure boundary as being connected to the reactor coolant system, up to and including the outermost containment isolation valve in system piping which penetrates primary reactor containment. The weld defect is located on the transmitter side of 1CV-309B. This can be isolated from the RCS by shutting 1CV-309B and 1CV-308B, 1P-1B RCP Labyrinth Seal 1PT-124 Lower Root.
"Based on the definition provided in 10 CFR 50.2, the condition is considered reportable under 50.72(b)(3)(ii).
"Unit 1 is currently in mode 3. Repairs for the condition are being determined.
"The NRC Resident Inspector has been notified."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2017/20171031en.html
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