9 janvier 2014
Arrêt automatique du réacteur pendant l’essai d’une voie de protection du niveau d’eau dans le générateur de vapeur. Durant cette opération, l’arrêt de la turbine a provoqué l’arrêt du réacteur. Comme le cœur était critique, les systèmes de protection du réacteur se sont enclenchés. Les causes de la survenue du problème sont en cours de recherche.
Type : PWR - Puissance : 2 339 MWth - Premières mise en service : 09 /1970
Available in english only.
Event Number : 49708 Facility : ROBINSON - 2 State : SC - Unit : [2] - RX Type : [2] W-3-LP Event Date : 01/09/2014 - Event Time : 22:34
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 REACTOR TRIP DUE TO TURBINE TRIP
"At 2234 hours EST on 01/09/2014, with the unit in Mode 1 at 100% power, an automatic reactor trip occurred. At the time of the event, Steam Generator Water level Protection Channel Testing was in progress. While testing was in progress with the ’C’ Steam Generator Channel 1 Water Level Protection channel in trip for testing, a Turbine Trip occurred. The cause of the Turbine Trip is under investigation.
"The [Turbine Driven and Motor Driven] Auxiliary Feedwater System automatically actuated, as expected due to low steam generator water level, and provided feedwater to the steam generators. The pressurizer Power Operated Relief Valves (PORVs) and the Main Steam Safety Valves did not open during the event. All control rods indicated fully inserted following the reactor trip.
"Currently, the unit is stable in Hot Standby (Mode 3).
"This event is being reported as a 4 hour Non-Emergency per 10 CFR 50.72(b)(2)(iv)(B) due to the valid Reactor Protection System Actuation.
"This event is being reported as an 8 hour Non-Emergency per 10 CFR 50.72(b)(3)(iv)(A) due to the valid actuation of Auxiliary Feedwater System.
"At no time during this occurrence was the public or plant staff at risk as a result of this event.
"The NRC Resident Inspector has been notified. State and local authorities will be notified. Estimated restart date is 1/12/2014"
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2014/20140110en.html