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Nuclear Event – (Automatic Reactor Scram) Hot Shutdown: Grand Gulf Nuclear Station, Mississippi

2016/06/27

Technological Hazard –  Nuclear Event

North America – USA | State of Mississippi, Claiborne County, Port Gibson, Grand Gulf Nuclear Station
Location: 32°00’24.0″N 91°02’54.0″W
Present Operational Age: ~30 years
Event: RPS ACTUATION – CRITICAL/HOT SHUTDOWN

Nuclear Event in USA on Saturday, 25 June, 2016 at 14:07 [CDT].

AUTOMATIC REACTOR SCRAM DUE TO TURBINE TRIP

“At 1407 [CDT], during power ascension to 100 percent, turbine control valves closed unexpectedly causing reactor protection trip signals that in turn caused a reactor scram. Reactor scram, turbine trip ONEPs [Off Normal Event Procedure], and EP2 [Emergency Procedure for Level Control] were entered. Reactor water level was stabilized at 36 inches narrow range on startup level and reactor pressure stabilized at 935 psig using bypass valves. No other safety system actuations occurred and all systems performed as designed.”

All control rods inserted. Reactor level is maintained by feedwater. Normal electrical shutdown configuration is through offsite electrical power sources. The Safety Relief Valves lifted, then closed. The plant is stable at normal level and pressure and remains in Mode 3. The event is under licensee investigation.

The licensee notified the NRC Resident Inspector.

Source: NRC Event Number:  52012

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Event History

Nuclear Event in USA on Friday, 17 June, 2016 at 02:57 [CDT]. AUTOMATIC REACTOR SCRAM DURING TESTING
Nuclear Event in USA on Tuesday, 29 March, 2016 at 11:23 [CDT]. REACTOR SCRAM DUE TO TURBINE TRIP
Nuclear Event in USA on Wednesday, 07 October, 2015 at 19:30 [CDT]. SECONDARY CONTAINMENT RENDERED INOPERABLE
Nuclear Event in USA on Monday, 07 June, 2015 at 22:59 [CDT] FIRE IN PROTECTED AREA
Nuclear Event in USA on Saturday, 07 February, 2015 at 18:56 [CST] AUTOMATIC REACTOR SCRAM

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