Event Notification Report for December 18, 2024
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
12/17/2024 - 12/18/2024
Agreement State
Event Number: 57478
Rep Org: Arkansas Department of Health
Licensee: Exploratory Ventures, LLC.
Region: 4
City: Oceola State: AR
County:
License #: ARK-1084-03120
Agreement: Y
Docket:
NRC Notified By: David Eichenberger
HQ OPS Officer: Tenisha Meadows
Licensee: Exploratory Ventures, LLC.
Region: 4
City: Oceola State: AR
County:
License #: ARK-1084-03120
Agreement: Y
Docket:
NRC Notified By: David Eichenberger
HQ OPS Officer: Tenisha Meadows
Notification Date: 12/19/2024
Notification Time: 10:04 [ET]
Event Date: 12/18/2024
Event Time: 00:00 [CST]
Last Update Date: 12/19/2024
Notification Time: 10:04 [ET]
Event Date: 12/18/2024
Event Time: 00:00 [CST]
Last Update Date: 12/19/2024
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
10 CFR Section:
Agreement State
Person (Organization):
Bywater, Russell (R4DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
Bywater, Russell (R4DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
AGREEMENT STATE REPORT - STUCK OPEN SHUTTER
The following information was received from the Arkansas Department of Health, Radiation Control (the Department) via email:
"On 12/18/2024, at 1530 CST, Exploratory Ventures LLC. notified the Department via phone that an IMS-5420-XX profile thickness gauge experienced a stuck open shutter. This gauge contains a 50.5 curie Cs-137 source, Eckert & Ziegler NuX.N27_A, serial number NR-1120-D-101-S, listed in the sealed source and device registry.
"An IMS technician arrived on-site at 1615 and was able to close the shutter at 1630. The gauge was moved from the in-line position to allow the technician to close the shutter; the technician opened the access panel on the gauge and placed an adjustable wrench on the pointer to manually close the shutter. As they started to turn the pointer, the spring of the shutter activated and closed the shutter. The technician closed the access panel then surveyed the area for radiation and found none.
"The gauge is currently locked-out and not in use. It will remain locked-out until an authorized service technician arrives to service the unit. The estimated date of service is pending.
"The investigation is ongoing and the report will proceed in accordance with SA-300."
Arkansas Event Number: AR-2023-005
The following information was received from the Arkansas Department of Health, Radiation Control (the Department) via email:
"On 12/18/2024, at 1530 CST, Exploratory Ventures LLC. notified the Department via phone that an IMS-5420-XX profile thickness gauge experienced a stuck open shutter. This gauge contains a 50.5 curie Cs-137 source, Eckert & Ziegler NuX.N27_A, serial number NR-1120-D-101-S, listed in the sealed source and device registry.
"An IMS technician arrived on-site at 1615 and was able to close the shutter at 1630. The gauge was moved from the in-line position to allow the technician to close the shutter; the technician opened the access panel on the gauge and placed an adjustable wrench on the pointer to manually close the shutter. As they started to turn the pointer, the spring of the shutter activated and closed the shutter. The technician closed the access panel then surveyed the area for radiation and found none.
"The gauge is currently locked-out and not in use. It will remain locked-out until an authorized service technician arrives to service the unit. The estimated date of service is pending.
"The investigation is ongoing and the report will proceed in accordance with SA-300."
Arkansas Event Number: AR-2023-005
Power Reactor
Event Number: 57477
Facility: Comanche Peak
Region: 4 State: TX
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Chris Metz
HQ OPS Officer: Adam Koziol
Region: 4 State: TX
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Chris Metz
HQ OPS Officer: Adam Koziol
Notification Date: 12/18/2024
Notification Time: 20:38 [ET]
Event Date: 12/18/2024
Event Time: 14:30 [CST]
Last Update Date: 12/18/2024
Notification Time: 20:38 [ET]
Event Date: 12/18/2024
Event Time: 14:30 [CST]
Last Update Date: 12/18/2024
Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(3)(xiii) - Loss Comm/Asmt/Response
10 CFR Section:
50.72(b)(3)(xiii) - Loss Comm/Asmt/Response
Person (Organization):
Bywater, Russell (R4DO)
Bywater, Russell (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 |
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
LOSS OF OFFSITE EMERGENCY NOTIFICATION SYSTEM CAPABILITY
The following information was provided by the licensee via phone and email:
"Comanche Peak Nuclear Power Plant (CPNPP) experienced an unplanned loss of the alert and notification system (ANS) method of outdoor warning primary siren capability for 30 hours from 12/17/24, 0900 CST to 12/18/24, at 1500.
"The capability to activate the sirens was lost during a planned activity to upgrade CPNPP radio system components. The loss of the capability to activate the sirens was not anticipated as part of the planned modification.
"The condition was discovered on 12/18/24, at 1430 while performing periodic testing on the ANS. The siren capability was restored at 1500 when the back-up radio repeater was powered on. The FEMA approved back-up alerting method (route alerting) was available during the loss of ANS siren capability.
"The CPNPP ANS system is currently functional on the back-up radio repeater. There were no plant activities that would have required siren activation during the loss of capability period."
The NRC Resident Inspector has been notified.
The following information was provided by the licensee via phone and email:
"Comanche Peak Nuclear Power Plant (CPNPP) experienced an unplanned loss of the alert and notification system (ANS) method of outdoor warning primary siren capability for 30 hours from 12/17/24, 0900 CST to 12/18/24, at 1500.
"The capability to activate the sirens was lost during a planned activity to upgrade CPNPP radio system components. The loss of the capability to activate the sirens was not anticipated as part of the planned modification.
"The condition was discovered on 12/18/24, at 1430 while performing periodic testing on the ANS. The siren capability was restored at 1500 when the back-up radio repeater was powered on. The FEMA approved back-up alerting method (route alerting) was available during the loss of ANS siren capability.
"The CPNPP ANS system is currently functional on the back-up radio repeater. There were no plant activities that would have required siren activation during the loss of capability period."
The NRC Resident Inspector has been notified.