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

2017/02/14

Nuclear Event in USA on Monday, 13 February, 2017 at 23:09 [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

UNIT 1 AUTOMATIC REACTOR SCRAM DUE TO MAIN GENERATOR TRIP ON DIFFERENTIAL CURRENT

“This notification is being provided in accordance with 10CFR50.72(b)(2)(iv)(B).

“On February 13, 2017 at 2309 CST, Unit 1 Reactor Automatic Scram signal was received due to Turbine Control Valves Fast Closure. The turbine trip was due to the main generator trip on Differential Current. The ‘U’ safety relief valve actuated in the relief mode on the turbine trip, and has subsequently reset with tailpipe temperature returning to normal. The plant is in a stable condition with reactor pressure being maintained by the Turbine Bypass valves. Reactor water level is being controlled with feedwater. Investigation into the cause of the event is in progress.”

All control rods fully inserted on the scram. Unit 1 is in a normal shutdown electric plant alignment. Unit 2 was not affected.

The licensee notified the NRC Resident Inspector.

Source: NRC Event Number: 52547

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