10 septembre 2016
Suite à l’arrêt, le système de contrôle de rupture d’alimentation de vapeur a été activé suite à l’atteinte d’un niveau élevé dans le Générateur de vapeur 1. L’origine des problèmes est en cours de recherche. Le réacteur est à l’arrêt (en mode 3) et le refroidissement assuré par les soupapes qui déchargent la vapeur à l’atmosphère. Tous les systèmes de sécurité auraient correctement fonctionné.
Type : PWR - Puissance : 2 817 MWth - Première divergence : 08 / 1977 -
Available in english only
Event Number : 52232
Facility : DAVIS BESSE
State : OH - Unit : [1] - RX Type : [1] B&W-R-LP
Event Date : 09/10/2016 - Event Time : 03:43 [EDT]
Emergency Class : NON EMERGENCY
10 CFR Section : 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Initial PWR : 100 % Current PWR : 0 %
Event Text
AUTOMATIC UNIT TRIP DUE TO MAIN GENERATOR LOCK-OUT
"At 0343 EDT, with the unit operating at approximately 100% full power, an automatic reactor trip occurred due to a Main Generator lock-out. The cause of the generator lock-out is being investigated at this time. All control rods fully inserted. Post trip, the Steam Feedwater Rupture Control System was actuated due to high Steam Generator 1 level. The cause of the high Steam Generator 1 level is being investigated at this time.
"The unit is currently in Mode 3 (Hot Standby) and stable, at approximately 550 degrees F and 2155 psig. Steam is being discharged through the Atmospheric Vent Valves for decay heat removal. There is no known primary to secondary leakage, and all safety systems functioned as expected.
"The NRC Resident Inspector has been notified of the event."
The licensee notified the State of Ohio, Ottawa and Lucas County.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2016/20160912en.html#en52232