Event Notification Report for May 15, 2024
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
05/14/2024 - 05/15/2024
EVENT NUMBERS
57128
57128
Power Reactor
Event Number: 57128
Facility: Cook
Region: 3 State: MI
Unit: [2] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: James Havlik
HQ OPS Officer: Brian P. Smith
Region: 3 State: MI
Unit: [2] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: James Havlik
HQ OPS Officer: Brian P. Smith
Notification Date: 05/15/2024
Notification Time: 05:50 [ET]
Event Date: 05/15/2024
Event Time: 04:27 [EDT]
Last Update Date: 05/15/2024
Notification Time: 05:50 [ET]
Event Date: 05/15/2024
Event Time: 04:27 [EDT]
Last Update Date: 05/15/2024
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
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS Actuation - Critical 50.72(b)(3)(iv)(A) - Valid Specif Sys Actuation
Person (Organization):
McCraw, Aaron (R3DO)
McCraw, Aaron (R3DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | M/R | Y | 20 | Power Operation | 0 | Hot Standby |
UNIT 2 MANUAL REACTOR TRIP
The following information was provided by the licensee via email:
"On May 15, 2024 at 0427 EDT, DC Cook's Unit 2 reactor was manually tripped due to difficulty maintaining steam generator water levels.
"DC Cook Unit 2 had removed the main turbine from service at approximately 0354 EDT during a planned down-power to repair a steam leak on the high pressure turbine right outer steam/stop control valve upstream drip pot. Stable steam generator water levels were unable to be maintained. As a result, DC Cook Unit 2 was manually tripped with reactor power stabilizing at approximately 20 percent.
"This notification is being made in accordance with 10 CFR 50.72(b)(2)(iv)(B), 'Reactor Protection System' actuation as a four hour report, and under 10 CFR 50.72(b)(3)(iv)(A), specified system actuation of the 'Auxiliary Feedwater System', as an eight hour report.
"The reactor trip was not complicated and all plant systems functioned normally. The DC Cook NRC Resident Inspector was notified."
The following information was provided by the licensee via email:
"On May 15, 2024 at 0427 EDT, DC Cook's Unit 2 reactor was manually tripped due to difficulty maintaining steam generator water levels.
"DC Cook Unit 2 had removed the main turbine from service at approximately 0354 EDT during a planned down-power to repair a steam leak on the high pressure turbine right outer steam/stop control valve upstream drip pot. Stable steam generator water levels were unable to be maintained. As a result, DC Cook Unit 2 was manually tripped with reactor power stabilizing at approximately 20 percent.
"This notification is being made in accordance with 10 CFR 50.72(b)(2)(iv)(B), 'Reactor Protection System' actuation as a four hour report, and under 10 CFR 50.72(b)(3)(iv)(A), specified system actuation of the 'Auxiliary Feedwater System', as an eight hour report.
"The reactor trip was not complicated and all plant systems functioned normally. The DC Cook NRC Resident Inspector was notified."