Catawba Nuclear Station – Loss of control room chillers

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Power Reactor Event Number: 47525
Facility: CATAWBA
Region: 2 State: SC
Unit: [1] [2] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: STEVE CHRISTOPHER
HQ OPS Officer: JOE O’HARA
Notification Date: 12/15/2011
Notification Time: 10:41 [ET]
Event Date: 12/15/2011
Event Time: 07:39 [EST]
Last Update Date: 12/15/2011
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(i) – PLANT S/D REQD BY TS
Person (Organization):
SCOTT FREEMAN (R2DO)
Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 100 Power Operation 99 Power Operation
2 N Y 100 Power Operation 100 Power Operation
DUAL UNIT TECHNICAL SPECIFICATION 3.0.3 REQUIRED SHUTDOWN DUE TO LOSS OF CONTROL ROOM CHILLERS

“Control room area chilled water system ‘B’ train tripped while control room area chilled water system ‘A’ train was isolated for maintenance. Unit 1 and Unit 2 entered technical specification 3.0.3 at 0739 EST. Unit 1 shutdown commenced at 1030 EST. Unit 2 shutdown is scheduled to commence at 1100 EST. This plant condition also requires a notification under 10CFR50.72(b)(3)(v).”

The licensee is investigating the cause of the trip on the ‘B’ train and is taking actions to restore the ‘A’ train to service and exit the shutdown. The electrical lineup is normal and all safety systems are operable.

The NRC Resident Inspector has been notified. The states of North Carolina and South Carolina will be notified. Local county governments of York, Gaston, and Mecklenberg counties will also be notified.

Source: NRC Event Notifications

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