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Nuclear Event – Automatic Reactor SCRAM/Hot Shutdown (2nd Event): LaSalle County Nuclear Generating Station, Unit 1, Illinois

2017/02/21

AUTOMATIC REACTOR SCRAM RESULTING FROM FEEDWATER REGULATING VALVE FAILURE

Nuclear Event in USA on Friday, 17 February, 2017 at 23:53 [CST].

North America – USA | State of Illinois – LaSalle County Station, Unit 1
Location: 41°14’44.0″N 88°40’09.0″W
Present Operational Age: ~32 years
Event: RPS ACTUATION – CRITICAL – AUTOMATIC REACTOR SCRAM

“This notification is being provided in accordance with 10CFR 50.72(b)(2)(iv)(B).

“On February 17, 2017 at 2353 CST, Unit 1 Reactor Automatic Scram signal was received due to Turbine Control Valves Fast Closure. The turbine trip was due to receipt of Level 8 Trip due to a failure of the Feedwater Regulating Valve to Full open. Plant is in a stable condition with reactor pressure being maintained by the Turbine Bypass valves. Reactor water level is being controlled with Feedwater thru the Low Flow Feedwater Regulating Valve. Further investigation into the cause of the event is in progress.”

All control rods fully inserted, and decay heat is being removed via steam to the main condenser using bypass valves.

The licensee has notified the NRC Resident Inspector.

Source: NRC Event Number: 52564


Previous Event

Nuclear Event in USA on Monday, 13 February, 2017 at 23:09 [CST]. NRC Event Number: 52547

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