17 mai 2010
L’arrêt s’est déroulé normalement avec des barres de contrôle normalement insérées dans le cœur. La cause du problème est en cours de recherche.
Type : PWR - Puissances : 3 650 MWth - Première divergence : 01/1986
Available in english only.
Event Number : 45931
Facility : MILLSTONE - State : CT
Unit : [3] - RX Type : [3] W-4-LP
Event Date : 05/17/2010 - Event Time : 10:17
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
Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode 3 A/R Y 17 Power Operation 0 Hot Standby
Event Text
AUTOMATIC REACTOR TRIP DUE TO LOW STEAM GENERATOR WATER LEVEL
"System Affected : RPS actuation and reactor trip. Actuation Initiation Signals : AFW auto initiation. Cause : Low level ’C’ steam generator. Effect of event on Plant : Reactor and turbine trip. Actions taken or Planned : Standard post trip actions. Additional information : Plant stabilized at NOP/NOT."
The licensee experienced a feedwater transient which initiated the event. All safety systems are available. All control rods fully inserted. The electrical lineup is normal. The decay heat path is through the condenser steam dumps. There were no relief valve or safety valve lifted during the transient. Primary plant temperature is 555 degrees Fahrenheit, and primary plant pressure is 2250 psig. The licensee is investigating the cause of the feed transient.
The licensee notified the NRC Resident Inspector, the Waterford Dispatch, and the State Department of Environmental Protection,
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2010/20100518en.html
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