Nuclear Event – Manual Reactor Trip: Watts Bar Nuclear Plant, Unit 2
North America – USA | State of Tennessee, Rhea County, Spring City, Watts Bar Nuclear Plant
Location: 35°36’10.0″N 84°47’22.0″W
Site Operational Age: ~31 years
Event: RPS ACTUATION – CRITICAL/MANUAL REACTOR TRIP
Nuclear Event in USA on Tuesday, 23 August, 2016 at 13:56 [EDT].
MANUAL TRIP DUE TO A LOSS OF MAIN FEEDWATER
“On August 23, 2016, at 1356 EDT, Watts Bar Nuclear Plant [WBN] Unit 2 reactor was manually tripped due to a loss of main feedwater.
“Concurrent with the reactor trip, the Auxiliary Feedwater system actuated as designed.
“All control and shutdown rods fully inserted. All safety systems responded as designed. The unit is currently stable in Mode 3, with decay heat removal via Auxiliary Feedwater and main steam dump systems. Unit 2 is in a normal shutdown electrical alignment.
“The cause is currently under investigation.
“This is being reported under 10CFR 50.72(b)(3)(iv)(A) and 10CFR 50.72(b)(2)(iv)(B).
“There was no effect on WBN Unit 1.
“The NRC Senior Resident Inspector has been notified.”
Nuclear Event in USA on Monday, 20 June, 2016 at 15:40 [EDT]. RPS ACTUATION – CRITICAL/AUTOMATIC REACTOR TRIP
Nuclear Event in USA on Sunday, 05 June, 2016 at 12:27 [EDT]. REACTOR TRIP AND ECCS ACTUATION CAUSED BY TURBINE GOVERNOR VALVE FAILURE
Nuclear Event in USA on Tuesday, 22 March, 2016 at 11:31 [EDT]. WATTS BAR AUTOMATIC REACTOR TRIP UNIT 1 [due to the actuation of the Over Temperature Delta Temperature bistables.]
Nuclear Event in USA on Thursday, 17 March, 2016 at 01:15 [EDT]. LOSS OF EMERGENCY AND AUXILIARY GAS TREATMENT SYSTEMS – UNIT 1
Nuclear Event in USA on Wednesday, 09 March, 2016 at 03:42 [EST]. UNUSUAL EVENT DECLARED DUE TO A FIRE GREATER THAN 15 MINUTES – UNIT 2