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Nuclear Event – (Automatic Reactor Scram) Hot Shutdown: Clinton Power Station, Unit 1, Illinois

2017/05/31

North America – USA | State of Illinois, Clinton Power Station, Unit 1
Location: 40°10’20.0″N 88°50’06.0″W
Present Operational Age: ~30 years
Emergency Level:  10 CFR Section:
50.72(b)(2)(iv)(B) – RPS ACTUATION – CRITICAL

Nuclear Event in USA on Tuesday, 30 May 2017 at 20:38 [CDT].

AUTOMATIC REACTOR SCRAM

“At 2038 [CDT], Clinton Power Station received an automatic RPS [Reactor Protection System]actuation. EOP-1 [Emergency Operating Procedure] was entered on RPV [Reactor Pressure Vessel] Level 3. The cause of the scram is unknown at this time. All systems responded appropriately following the scram and the plant is currently stable.”

Reactor level is being maintained by normal feedwater and decay heat is being removed to the main condenser via the steam dump bypass valves. The plant is in a normal shutdown electrical lineup. The plant main generator was synchronized to the electrical grid and the plant was conducting control rod scram time testing at the time of the reactor trip.

The licensee notified the NRC Resident Inspector.

Source: NRC  Event Number: 52777

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