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Event Notification Report for January 02, 2020

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
1/1/2020 - 1/2/2020

** EVENT NUMBERS **

Power Reactor	Event Number: 54460
Facility: COMANCHE PEAK Region: 4 State: TX Unit: [] [2] [] RX Type: [1] W-4-LP,[2] W-4-LP NRC Notified By: CHRIS METZ HQ OPS Officer: BRIAN LIN	Notification Date: 01/01/2020 Notification Time: 16:57 [ET] Event Date: 01/01/2020 Event Time: 12:53 [CST] Last Update Date: 01/01/2020
Emergency Class: NON EMERGENCY 10 CFR Section: 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION	Person (Organization): GREG WARNICK (R4DO)

Unit

SCRAM Code

RX Crit

Initial PWR

Initial RX Mode

Current PWR

Current RX Mode

M/R

100

Power Operation

Hot Standby

Event Text

MANUAL REACTOR TRIP AND SPECIFIED SYSTEM ACTUATION

"At 1253 [CST] Unit 2 Reactor was manually tripped due to a trip of both Main Feed Pumps. During an evolution to secure Circulating Water Pump 2-01, vacuum was reduced in the auxiliary condensers for both Main Feed Pumps causing both Main Feed Pumps to trip. Both Motor Driven and the Turbine Driven Auxiliary Feedwater Pumps started due to steam generator Lo-Lo levels.

"Unit 2 is being maintained in Hot Standby (Mode 3) in accordance with Integrated Plant Operating Procedure IPO-0078. The Emergency Response Guideline Network has been exited. Decay heat is being rejected to the Main Condenser via the Steam Dump Valves."

The licensee notified the NRC Resident Inspector.

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