Saint Lucie Nuclear Power Plant trips due to rising condenser backpressure

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Power Reactor Event Number: 47353
Facility: SAINT LUCIE
Region: 2 State: FL
Unit: [1] [ ] [ ]
RX Type: [1] CE,[2] CE
NRC Notified By: DAVE FIELDS
HQ OPS Officer: JOHN SHOEMAKER
Notification Date: 10/19/2011
Notification Time: 07:32 [ET]
Event Date: 10/19/2011
Event Time: 05:28 [EDT]
Last Update Date: 10/19/2011
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) – RPS ACTUATION – CRITICAL
Person (Organization):
MARK LESSER (R2DO)

 

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 M/R Y 86 Power Operation 0 Hot Standby

Event Text

MANUAL REACTOR TRIP ON LOSS OF CONDENSER VACUUM”On October 19, 2011, at 0528, Unit 1 was manually tripped due to rising condenser backpressure. All (Control Element Assembly) CEAs fully inserted into the core. Decay Heat Removal is from Main Feedwater and Steam Bypass to the Main Condenser. The cause of the rising backpressure was an unplanned trip the Circulating Water Pump 1A1, which degraded the Circulating Water System performance. At the time of the trip, an additional Circulating Water Pump 1A2 was secured for planned maintenance.

“The cause of the Circulating Water Pump 1A1 trip is under investigation.

“This event is reportable pursuant to 10CFR 50.72(b)(2)(iv)(B) for the Reactor Trip.”

The plant is stable at normal operating temperature and pressure.

The licensee notified the NRC Resident Inspector.

Source: www.nrc.gov, via Enformable

 

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