Event Notification Report for March 22, 2024
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
03/21/2024 - 03/22/2024
Power Reactor
Event Number: 57045
Facility: Cook
Region: 3 State: MI
Unit: [2] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Bud Hinckley
HQ OPS Officer: Ian Howard
Region: 3 State: MI
Unit: [2] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Bud Hinckley
HQ OPS Officer: Ian Howard
Notification Date: 03/22/2024
Notification Time: 12:31 [ET]
Event Date: 03/22/2024
Event Time: 08:52 [EDT]
Last Update Date: 03/22/2024
Notification Time: 12:31 [ET]
Event Date: 03/22/2024
Event Time: 08:52 [EDT]
Last Update Date: 03/22/2024
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):
Hills, David (R3DO)
Hills, David (R3DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | A/R | Y | 48 | Power Operation | 0 | Hot Standby |
REACTOR TRIP DUE TO MAIN TURBINE TRIP
The following information was provided by the licensee via email and phone:
"At 0852 EDT on March 22, 2024, with Unit 2 at 48 percent reactor power, Unit 2 reactor automatically tripped due to a main turbine automatic trip from a high-high thrust bearing position trip signal.
"This notification is being made in accordance with 10 CFR 50.72(b)(2)(iv)(B), reactor protection system (RPS) actuation as a four hour report. This notification is also being made in accordance with 10 CFR 50.72(b)(3)(iv)(A) due to automatic auxiliary feedwater system actuation immediately following the turbine and reactor trip as an eight hour report.
"The DC Cook Resident NRC Inspector has been notified.
"Unit 2 is being supplied by offsite power. All control rods fully inserted. Both motor driven auxiliary feedwater pumps and the turbine driven auxiliary feedwater pump automatically started on the reactor trip. Decay heat is being removed via the steam dump system to the main condenser. Preliminary evaluation indicates plant systems functioned normally following the reactor trip. Unit 2 remains stable in Mode 3 while conducting the post trip review. No radioactive release is in progress as a result of this event."
The following information was provided by the licensee via email and phone:
"At 0852 EDT on March 22, 2024, with Unit 2 at 48 percent reactor power, Unit 2 reactor automatically tripped due to a main turbine automatic trip from a high-high thrust bearing position trip signal.
"This notification is being made in accordance with 10 CFR 50.72(b)(2)(iv)(B), reactor protection system (RPS) actuation as a four hour report. This notification is also being made in accordance with 10 CFR 50.72(b)(3)(iv)(A) due to automatic auxiliary feedwater system actuation immediately following the turbine and reactor trip as an eight hour report.
"The DC Cook Resident NRC Inspector has been notified.
"Unit 2 is being supplied by offsite power. All control rods fully inserted. Both motor driven auxiliary feedwater pumps and the turbine driven auxiliary feedwater pump automatically started on the reactor trip. Decay heat is being removed via the steam dump system to the main condenser. Preliminary evaluation indicates plant systems functioned normally following the reactor trip. Unit 2 remains stable in Mode 3 while conducting the post trip review. No radioactive release is in progress as a result of this event."
Agreement State
Event Number: 57055
Rep Org: Colorado Dept of Health
Licensee: First Bank - Vail
Region: 4
City: Vail State: CO
County:
License #: CO240007
Agreement: Y
Docket:
NRC Notified By: Kathryn Kirk
HQ OPS Officer: Natalie Starfish
Licensee: First Bank - Vail
Region: 4
City: Vail State: CO
County:
License #: CO240007
Agreement: Y
Docket:
NRC Notified By: Kathryn Kirk
HQ OPS Officer: Natalie Starfish
Notification Date: 03/26/2024
Notification Time: 18:00 [ET]
Event Date: 03/22/2024
Event Time: 00:00 [MDT]
Last Update Date: 03/26/2024
Notification Time: 18:00 [ET]
Event Date: 03/22/2024
Event Time: 00:00 [MDT]
Last Update Date: 03/26/2024
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
10 CFR Section:
Agreement State
Person (Organization):
Kellar, Ray (R4DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
ILTAB, (EMAIL) (EMAIL)
Kellar, Ray (R4DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
ILTAB, (EMAIL) (EMAIL)
AGREEMENT STATE REPORT - LOST EXIT SIGNS
The following is a summary of information received from the Colorado Department of Public Health and Environment via email:
Seven Isolite Corporation exit signs, model 2040, containing 11.5 curies each, of tritium (80.5 curies total) were determined to be lost.
Colorado event number CO240007
THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' LEVEL OF RADIOACTIVE MATERIAL
Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf
The following is a summary of information received from the Colorado Department of Public Health and Environment via email:
Seven Isolite Corporation exit signs, model 2040, containing 11.5 curies each, of tritium (80.5 curies total) were determined to be lost.
Colorado event number CO240007
THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' LEVEL OF RADIOACTIVE MATERIAL
Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf