Event Notification Report for March 10, 2024
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
03/09/2024 - 03/10/2024
EVENT NUMBERS
57019
57019
Power Reactor
Event Number: 57019
Facility: South Texas
Region: 4 State: TX
Unit: [1] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Billy Herzog
HQ OPS Officer: Brian P. Smith
Region: 4 State: TX
Unit: [1] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Billy Herzog
HQ OPS Officer: Brian P. Smith
Notification Date: 03/10/2024
Notification Time: 12:05 [ET]
Event Date: 03/10/2024
Event Time: 03:53 [CDT]
Last Update Date: 03/10/2024
Notification Time: 12:05 [ET]
Event Date: 03/10/2024
Event Time: 03:53 [CDT]
Last Update Date: 03/10/2024
Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(3)(v)(D) - Accident Mitigation
10 CFR Section:
50.72(b)(3)(v)(D) - Accident Mitigation
Person (Organization):
Gaddy, Vincent (R4DO)
Gaddy, Vincent (R4DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
ESSENTIAL CHILLED WATER TRAINS DECLARED INOPERABLE
The following information was provided by the licensee via email:
"On 3/9/2024 at 2126 CST, train C essential cooling water was declared inoperable due to a through-wall leak on the discharge vent line. This would also cascade and cause train C essential chilled water to be inoperable.
"On 3/10/2024 at 0353 CDT, train B essential chilled water was declared inoperable due to chilled water outlet temperature greater than 52 degrees F following startup of essential chiller 12B. Chilled water outlet temperature was adjusted to less than 52 degrees F at 0440 CDT, and train B essential chilled water was declared operable.
"This condition resulted in the inoperability of two of the three safety trains required for the accident mitigating functions including: high head safety injection, low head safety injection, containment spray, electrical auxiliary building HVAC, control room envelope HVAC, and essential chilled water.
"This is an 8 hour reportable condition per 10CFR50.72(b)(3)(v)(D) because it could affect the ability to mitigate the consequences of an accident."
The licensee notified the NRC Resident Inspector.
The following information was provided by the licensee via email:
"On 3/9/2024 at 2126 CST, train C essential cooling water was declared inoperable due to a through-wall leak on the discharge vent line. This would also cascade and cause train C essential chilled water to be inoperable.
"On 3/10/2024 at 0353 CDT, train B essential chilled water was declared inoperable due to chilled water outlet temperature greater than 52 degrees F following startup of essential chiller 12B. Chilled water outlet temperature was adjusted to less than 52 degrees F at 0440 CDT, and train B essential chilled water was declared operable.
"This condition resulted in the inoperability of two of the three safety trains required for the accident mitigating functions including: high head safety injection, low head safety injection, containment spray, electrical auxiliary building HVAC, control room envelope HVAC, and essential chilled water.
"This is an 8 hour reportable condition per 10CFR50.72(b)(3)(v)(D) because it could affect the ability to mitigate the consequences of an accident."
The licensee notified the NRC Resident Inspector.