4 mai 2014
Le réacteur était en état sous-critique lorsque un mauvais positionnement des barres de contrôle a été observé. Ces barres ont alors été insérées manuellement dans le cœur, par les opérateurs, avant l’ouverture des disjoncteurs d’arrêt du réacteur.
Type : PWR - Puissance : 2 871 MWth - Première divergence : 08/1977
Available in english only.
Event Number : 50097 Facility : DAVIS BESSE - State : OH - Unit : [1] - RX Type : [1] B&W-R-LP
Event Date : 05/04/2014 - Event Time : 08:32
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Initial PWR : 0 % Current PWR : 0 %
Event Text
MANUAL INITIATION OF THE REACTOR PROTECTION SYSTEM WHILE SHUTDOWN
"On 5/4/14 while the plant was in Mode 3 and the reactor not critical, unexpected position indications were observed on a Control Rod while withdrawing an Axial Power Shaping Rod (APSR). Due to the uncertainty of rod positions, the APSR was inserted into the core. The reactor trip breakers were then opened from the Control Room using the manual trip pushbuttons. All Control and Safety Rods were unlatched and fully inserted into the reactor core before the reactor trip breakers were opened.
"This manual initiation of the Reactor Protection System with the reactor not critical is being reported per 10 CFR 50.72(b)(3)(iv)(A). The reportability of this event was determined based on an extent of condition review for Event Number 50086 that occurred 5/5/14. The failure to meet the 8-hour reporting requirement has been entered into the Corrective Action Program."
The licensee notified the NRC Resident Inspector, the State of Ohio, and Ottawa and Lucas Counties.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2014/20140509en.html
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