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Event Notification Report for June 11, 2019

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
6/10/2019 - 6/11/2019

** EVENT NUMBERS **

Power Reactor	Event Number: 54096
Facility: RIVER BEND Region: 4 State: LA Unit: [1] [] [] RX Type: [1] GE-6 NRC Notified By: ALFONSO CROEZE HQ OPS Officer: JEFFREY WHITED	Notification Date: 06/01/2019 Notification Time: 03:15 [ET] Event Date: 05/31/2019 Event Time: 23:45 [CDT] Last Update Date: 06/10/2019
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): JASON KOZAL (R4DO)

Unit

SCRAM Code

RX Crit

Initial PWR

Initial RX Mode

Current PWR

Current RX Mode

M/R

Power Operation

Hot Shutdown

Event Text

MANUAL REACTOR SCRAM DUE TO LOW REACTOR WATER LEVEL

"At 2345 CDT at River Bend Station (RBS) Unit 1, a manual Reactor scram was inserted in anticipation of receiving an automatic Reactor Water Level 3 (9.7") scram due to the isolation of the 'B' Heater String with the 'A' Heater String already isolated. The 'B' heater string isolation caused loss of suction and subsequent trip of the running Feed Water Pumps 'A' and 'C'. All control rods fully inserted with no issues. Subsequently Reactor level was controlled by the Reactor Core Isolation Cooling (RCIC) system. Feed Water Pump 'C' was restored 4 minutes after the initial trip and the RCIC system secured. Currently RBS-1 is stable and is being cooled down using Turbine Bypass Valves.

"No radiological releases have occurred due to this event from the unit."

The plant is currently under a normal shutdown electrical lineup.

The licensee notified the NRC Resident Inspector.

* * * UPDATE AT 1603 EDT ON 6/10/19 FROM ALFONSO CROEZE TO JEFF HERRERA * * *

"This amended event notification is being made to provide additional information that was not included in the original notification made on 6/1/19 at 0315 EDT. This event was reportable under 10 CFR 50.72(b)(3)(iv)(A) which was not annotated or described in the original report.

"Forty-two minutes after the Feed Water Pump 'C' was started, the pump tripped causing a Reactor Water Level 3 (9.7") RPS actuation. Feed Water was restored five minutes later using the Feed Water Pump 'A'."

The NRC Resident Inspector has been notified.

Notified the R4DO (Warnick).

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