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Event Notification Report for March 13, 2023

U.S. Nuclear Regulatory Commission
Operations Center

EVENT REPORTS FOR
03/10/2023 - 03/13/2023

EVENT NUMBERS
56401 56403

Power Reactor

Event Number: 56401

Facility: Callaway
Region: 4 State: MO
Unit: [1] [] []
RX Type: [1] W-4-LP
NRC Notified By: Matt Sellers
HQ OPS Officer: Thomas Herrity

Notification Date: 03/09/2023
Notification Time: 17:51 [ET]
Event Date: 03/09/2023
Event Time: 11:53 [CST]
Last Update Date: 03/09/2023

Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(2)(xi) - Offsite Notification

Person (Organization):
Gepford, Heather (R4DO)

Power Reactor Unit Info
Unit	SCRAM Code	RX Crit	Initial PWR	Initial RX Mode	Current PWR	Current RX Mode
1	N	Y	100	Power Operation	100	Power Operation

Event Text

OFFSITE NOTIFICATION DUE TO INJURED WORKER

The following information was provided by the licensee via email:
"At approximately 1153 CST on March 9, 2023, a contract worker was injured requiring an ambulance transport to a local hospital. Union Electric (Ameren Missouri) subsequently learned that the individual requires an overnight hospital stay. This event is reportable to the Occupational Safety and Health Administration per 29 CFR 1904.39(a)(2) by the contract worker's employer and is reportable to the Missouri Public Service Commission in accordance with Missouri regulation 20 CSR 4240-3.190(3)(A). This notification is being made to the NRC pursuant to 10 CFR 50.72(b)(2)(xi) due to other government notification. The individual was not working in a radiologically controlled area.

"The NRC Senior Resident Inspector has been notified of this event."

Power Reactor

Event Number: 56403

Facility: Waterford
Region: 4 State: LA
Unit: [3] [] []
RX Type: [3] CE
NRC Notified By: Kevin Hale
HQ OPS Officer: Ernest West

Notification Date: 03/10/2023
Notification Time: 07:25 [ET]
Event Date: 03/10/2023
Event Time: 02:37 [CST]
Last Update Date: 03/10/2023

Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(2)(i) - Plant S/D Reqd By Ts

Person (Organization):
Gepford, Heather (R4DO)

Power Reactor Unit Info
Unit	SCRAM Code	RX Crit	Initial PWR	Initial RX Mode	Current PWR	Current RX Mode
3	N	Y	100	Power Operation	0	Hot Standby

Event Text

SHUTDOWN REQUIRED BY TECHNICAL SPECIFICATIONS

The following information was provided by the licensee via email:

"On 03/09/2023 at 2200 CST, Waterford [Unit] 3 entered OP-901-111, Reactor Coolant System Leakage, and OP-901-403, High Activity In Containment, due to elevated reactor coolant system (RCS) leakage in containment. On 03/10/2023, at 0030 Operations entered Technical Specification 3.4.5.2 action (c) due to unidentified leakage exceeding 1 gallon per minute (gpm). Technical Specification 3.4.5.2 action (c) requires reducing the leakage rate to within limits within 4 hours or be in at least hot standby within the next 6 hours and in cold shutdown within the following 30 hours.

"On 03/10/2023 at 0237 the plant discovered an unisolable RCS leak in the reactor coolant pump 1B cubicle and initiated action to complete a plant shutdown required by Technical Specifications. This event is being reported as a 4-hour report in accordance with 10 CFR 50.72(b)(2)(i) as the initiation of plant shutdown required by technical specifications. Reactor was tripped at 0521 CST on 3/10/2023."