Event Notification Report for March 12, 2024
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
03/11/2024 - 03/12/2024
Agreement State
Event Number: 57027
Rep Org: Minnesota Department of Health
Licensee: Northshore Mining Company
Region: 3
City: Silver Bay State: MN
County:
License #: 1080
Agreement: Y
Docket:
NRC Notified By: Tyler Kruse
HQ OPS Officer: Kerby Scales
Licensee: Northshore Mining Company
Region: 3
City: Silver Bay State: MN
County:
License #: 1080
Agreement: Y
Docket:
NRC Notified By: Tyler Kruse
HQ OPS Officer: Kerby Scales
Notification Date: 03/13/2024
Notification Time: 10:42 [ET]
Event Date: 03/12/2024
Event Time: 14:20 [CDT]
Last Update Date: 03/13/2024
Notification Time: 10:42 [ET]
Event Date: 03/12/2024
Event Time: 14:20 [CDT]
Last Update Date: 03/13/2024
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
10 CFR Section:
Agreement State
Person (Organization):
Hills, David (R3DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
Hills, David (R3DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
AGREEMENT STATE REPORT - MISSING SHUTTER
The following information was received by the Minnesota Department of Health (MDH) via email:
"On March 12, 2024, at 1539 CDT, the licensee contacted MDH to report a gauge with a missing shutter. During their routine semiannual inventory and shutter check, the licensee discovered a Texas Nuclear model 5190 fixed gauge that was missing its shutter. The gauge contained a 100 mCi Cs-137 source (decayed to 35 mCi). The gauge was equipped with a removable shutter, and the licensee assumes that it had become loose and detached from the device due to normal operating vibration. The event was discovered at approximately 1420 on March 12, 2024.
"The licensee stated that they had a spare shutter and were able to install it on the gauge. The gauge was installed and operating when the missing shutter was discovered. Therefore, no abnormal radiation field or exposure occurred due to the missing shutter. At the time of the call, the licensee had not yet located the missing shutter. This gauge is used for density measurements on their tailings clarifier underflow pump."
Minnesota State Event Report Number: MN240002
The following information was received by the Minnesota Department of Health (MDH) via email:
"On March 12, 2024, at 1539 CDT, the licensee contacted MDH to report a gauge with a missing shutter. During their routine semiannual inventory and shutter check, the licensee discovered a Texas Nuclear model 5190 fixed gauge that was missing its shutter. The gauge contained a 100 mCi Cs-137 source (decayed to 35 mCi). The gauge was equipped with a removable shutter, and the licensee assumes that it had become loose and detached from the device due to normal operating vibration. The event was discovered at approximately 1420 on March 12, 2024.
"The licensee stated that they had a spare shutter and were able to install it on the gauge. The gauge was installed and operating when the missing shutter was discovered. Therefore, no abnormal radiation field or exposure occurred due to the missing shutter. At the time of the call, the licensee had not yet located the missing shutter. This gauge is used for density measurements on their tailings clarifier underflow pump."
Minnesota State Event Report Number: MN240002
Non-Agreement State
Event Number: 57025
Rep Org: Eli Lilly and Co.
Licensee: Eli Lilly and Co.
Region: 3
City: Indianapolis State: IN
County:
License #: GL Materials
Agreement: N
Docket:
NRC Notified By: Katherine Haldeman
HQ OPS Officer: Sam Colvard
Licensee: Eli Lilly and Co.
Region: 3
City: Indianapolis State: IN
County:
License #: GL Materials
Agreement: N
Docket:
NRC Notified By: Katherine Haldeman
HQ OPS Officer: Sam Colvard
Notification Date: 03/12/2024
Notification Time: 12:29 [ET]
Event Date: 03/12/2024
Event Time: 00:00 [EDT]
Last Update Date: 03/12/2024
Notification Time: 12:29 [ET]
Event Date: 03/12/2024
Event Time: 00:00 [EDT]
Last Update Date: 03/12/2024
Emergency Class: Non Emergency
10 CFR Section:
20.2201(a)(1)(i) - Lost/Stolen LNM>1000x
10 CFR Section:
20.2201(a)(1)(i) - Lost/Stolen LNM>1000x
Person (Organization):
Hills, David (R3DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
ILTAB, (EMAIL) (EMAIL)
Hills, David (R3DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
ILTAB, (EMAIL) (EMAIL)
NON-AGREEMENT STATE REPORT - LOST TRITIUM EXIT SIGN
The following summary of information was provided by the licensee via phone and email:
During an inventory which began the week of March 4, 2024, the licensee discovered one lost tritium exit sign (Isolite SLX-60, 4.4 Ci). The sign was at a location undergoing renovation. All other tritium exit signs that were on site have been accounted for. An investigation ensued to attempt to determine the disposition of the missing sign. This sign was declared lost on March 12, 2024.
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 summary of information was provided by the licensee via phone and email:
During an inventory which began the week of March 4, 2024, the licensee discovered one lost tritium exit sign (Isolite SLX-60, 4.4 Ci). The sign was at a location undergoing renovation. All other tritium exit signs that were on site have been accounted for. An investigation ensued to attempt to determine the disposition of the missing sign. This sign was declared lost on March 12, 2024.
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
Power Reactor
Event Number: 57024
Facility: Comanche Peak
Region: 4 State: TX
Unit: [2] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Casey Davies
HQ OPS Officer: Sam Colvard
Region: 4 State: TX
Unit: [2] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Casey Davies
HQ OPS Officer: Sam Colvard
Notification Date: 03/12/2024
Notification Time: 12:16 [ET]
Event Date: 03/12/2024
Event Time: 08:16 [CDT]
Last Update Date: 03/12/2024
Notification Time: 12:16 [ET]
Event Date: 03/12/2024
Event Time: 08:16 [CDT]
Last Update Date: 03/12/2024
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):
Werner, Greg (R4DO)
Werner, Greg (R4DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | A/R | Y | 100 | Power Operation | 0 | Hot Standby |
EN Revision Imported Date: 3/13/2024
EN Revision Text: AUTOMATIC REACTOR TRIP
The following information was provided by the licensee via phone and email:
"On March 12, 2024, at 0816 CDT, Comanche Peak Unit 2 reactor automatically tripped on lo-lo level in the 2-03 steam generator (SG). Prior to the trip, main feedwater pump (MFP) 2A speed reduced and a manual runback to 700 MW (60 percent) was in progress. Both motor driven auxiliary feedwater pumps and the turbine driven auxiliary feedwater pump started due to lo-lo level in all SGs.
"Concurrent with the loss of speed on MFP 2A, a servo filter swap was in progress on MFP 2A.
"Unit 2 is being maintained in hot standby (Mode 3) in accordance with integrated plant operating procedure IPO-007A. The emergency response guideline network has been exited. Decay heat is being rejected to the main condenser via the steam dump valves."
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
The cause of the loss of the MFP is under investigation. Unit 1 was unaffected.
EN Revision Text: AUTOMATIC REACTOR TRIP
The following information was provided by the licensee via phone and email:
"On March 12, 2024, at 0816 CDT, Comanche Peak Unit 2 reactor automatically tripped on lo-lo level in the 2-03 steam generator (SG). Prior to the trip, main feedwater pump (MFP) 2A speed reduced and a manual runback to 700 MW (60 percent) was in progress. Both motor driven auxiliary feedwater pumps and the turbine driven auxiliary feedwater pump started due to lo-lo level in all SGs.
"Concurrent with the loss of speed on MFP 2A, a servo filter swap was in progress on MFP 2A.
"Unit 2 is being maintained in hot standby (Mode 3) in accordance with integrated plant operating procedure IPO-007A. The emergency response guideline network has been exited. Decay heat is being rejected to the main condenser via the steam dump valves."
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
The cause of the loss of the MFP is under investigation. Unit 1 was unaffected.
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor
Event Number: 57026
Facility: Catawba
Region: 2 State: SC
Unit: [1] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Joshua Gower
HQ OPS Officer: Kerby Scales
Region: 2 State: SC
Unit: [1] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Joshua Gower
HQ OPS Officer: Kerby Scales
Notification Date: 03/13/2024
Notification Time: 02:29 [ET]
Event Date: 03/12/2024
Event Time: 21:11 [EDT]
Last Update Date: 03/13/2024
Notification Time: 02:29 [ET]
Event Date: 03/12/2024
Event Time: 21:11 [EDT]
Last Update Date: 03/13/2024
Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(3)(iv)(A) - Valid Specif Sys Actuation
10 CFR Section:
50.72(b)(3)(iv)(A) - Valid Specif Sys Actuation
Person (Organization):
Miller, Mark (R2DO)
Miller, Mark (R2DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
LOSS OF POWER TO CONTAINMENT RADIATION MONITORS
The following information was provided by the licensee via phone and email:
"On March 12, 2024, at 2111 EDT, a valid containment ventilation isolation train 'A' and 'B' signal was received due to a spurious loss of power to 1EMF-38 (containment particulate radiation monitor) and 1EMF-39 (containment gas radiation monitor). The power to 1EMF-38 and 1EMF-39 was restored.
"There was no impact on the health and safety of the public or plant personnel.
"The NRC Resident Inspector has been notified"
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
There were no plant evolutions ongoing at the time of the event and the cause of the loss of power is under investigation. There was no impact to Unit 2.
* * * RETRACTION ON 3/13/2024 AT 1436 EDT FROM JASON MOORE TO SAM COLVARD * * *
"After further review of the event, it was determined the actuation of the associated containment ventilation isolation train 'A' and 'B' was not valid. This is due to the loss of power being associated with the control room modules for 1EMF-38 and 1EMF-39, and not a result of an actual sensed parameter or plant condition. Therefore, this event notification is being retracted.
"The NRC Resident Inspector has been notified."
Notified R2DO (Miller)
The following information was provided by the licensee via phone and email:
"On March 12, 2024, at 2111 EDT, a valid containment ventilation isolation train 'A' and 'B' signal was received due to a spurious loss of power to 1EMF-38 (containment particulate radiation monitor) and 1EMF-39 (containment gas radiation monitor). The power to 1EMF-38 and 1EMF-39 was restored.
"There was no impact on the health and safety of the public or plant personnel.
"The NRC Resident Inspector has been notified"
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
There were no plant evolutions ongoing at the time of the event and the cause of the loss of power is under investigation. There was no impact to Unit 2.
* * * RETRACTION ON 3/13/2024 AT 1436 EDT FROM JASON MOORE TO SAM COLVARD * * *
"After further review of the event, it was determined the actuation of the associated containment ventilation isolation train 'A' and 'B' was not valid. This is due to the loss of power being associated with the control room modules for 1EMF-38 and 1EMF-39, and not a result of an actual sensed parameter or plant condition. Therefore, this event notification is being retracted.
"The NRC Resident Inspector has been notified."
Notified R2DO (Miller)