2 September 2017
Ce problème a engendré la perte de la pièce principale de contrôle bloquant de fait un niveau d’action d’urgence. Les zones de sécurité doivent avoir un niveau d’activité radioactive inférieur à 1 310 mSv/an. Des mesures compensatoires ont été prises à travers la mise en place de radiamètres portatifs à seuils d’alarme. Une maintenance prioritaire est planifiée pour rétablir le moniteur.
Type : PWR - Puissance : 1 175 MWth - Première divergence : 11 1969 -
Available in english only
Event Number: 52946
Facility: GINNA
State: NY
Unit: [1] - X Type: [1] W-2-LP
Event Date: 09/02/2017 - Event Time: 11:48 [EDT]
Emergency Class: NON EMERGENCY 10 CFR Section: 50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Initial PWR Current PWR 100 % 100 %
Event Text
AREA RADIATION MONITOR FAILURE
"MCR (Main Control Room) area radiation monitor R-1 failed at 1148 [EDT on] 9/2/2017. This caused a loss of capability to classify EAL [Emergency Action Level] RA3.1, Dose Rates greater than 15 mrem/hr in either of the following areas requiring continuous occupancy to maintain plant safety functions: Control Room (R-1) or CAS [Central Alarm Station]. Compensatory measures are currently in place with a portable radiation monitor in the MCR with alarm setpoints consistent with R-1. Priority maintenance is being planned to restore R-1 to service."
The licensee will notify the NRC Resident Inspector.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2017/20170905en.html