Event Notification Report for August 06, 2025
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
08/05/2025 - 08/06/2025
Agreement State
Event Number: 57855
Rep Org: Louisiana DEQ
Licensee: Union Carbide Corporation
Region: 4
City: Taft State: LA
County: St Charles Parish
License #: LA-2163-L01
Agreement: Y
Docket:
NRC Notified By: James Pate III
HQ OPS Officer: Jordan Wingate
Licensee: Union Carbide Corporation
Region: 4
City: Taft State: LA
County: St Charles Parish
License #: LA-2163-L01
Agreement: Y
Docket:
NRC Notified By: James Pate III
HQ OPS Officer: Jordan Wingate
Notification Date: 08/07/2025
Notification Time: 14:33 [ET]
Event Date: 08/06/2025
Event Time: 22:48 [CDT]
Last Update Date: 08/08/2025
Notification Time: 14:33 [ET]
Event Date: 08/06/2025
Event Time: 22:48 [CDT]
Last Update Date: 08/08/2025
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 - BROKEN GAUGE SHUTTER
The following is a summary of the information provided by the Louisianna Department of Environmental Quality (LDEQ) via email:
On August 06, 2025, at 2248 CDT, LDEQ was notified by Union Carbide Corporation's radiation safety officer via phone concerning a broken handle for the shutter rotor on a fixed nuclear gauge. This condition was identified during a six-month inspection by BBP Sales (a third-party inspector) in their Poly Ethylene Plant Unit - LP-6 Rx3 West Product Chamber. The fixed gauge is used for level/density and is in the "On" position. This is its normal position and poses no additional risk to the public or plant personnel.
BBP Sales is planning to replace the rotor with a new rotor and handle next week.
Ohmart SH-F2-0 nuclear gauge
Serial number: 20285009
Source serial number: 156OCO
Isotope: Cs-137
Activity: 500 mCi
LA Event Report ID Number: LA 20250006
The following is a summary of the information provided by the Louisianna Department of Environmental Quality (LDEQ) via email:
On August 06, 2025, at 2248 CDT, LDEQ was notified by Union Carbide Corporation's radiation safety officer via phone concerning a broken handle for the shutter rotor on a fixed nuclear gauge. This condition was identified during a six-month inspection by BBP Sales (a third-party inspector) in their Poly Ethylene Plant Unit - LP-6 Rx3 West Product Chamber. The fixed gauge is used for level/density and is in the "On" position. This is its normal position and poses no additional risk to the public or plant personnel.
BBP Sales is planning to replace the rotor with a new rotor and handle next week.
Ohmart SH-F2-0 nuclear gauge
Serial number: 20285009
Source serial number: 156OCO
Isotope: Cs-137
Activity: 500 mCi
LA Event Report ID Number: LA 20250006
Agreement State
Event Number: 57853
Rep Org: Louisiana Radiation Protection Div
Licensee: Rubicon, LLC
Region: 4
City: Geismar State: LA
County:
License #: LA-22320-L01
Agreement: Y
Docket:
NRC Notified By: Russell Clark II
HQ OPS Officer: Jon Lilliendahl
Licensee: Rubicon, LLC
Region: 4
City: Geismar State: LA
County:
License #: LA-22320-L01
Agreement: Y
Docket:
NRC Notified By: Russell Clark II
HQ OPS Officer: Jon Lilliendahl
Notification Date: 08/06/2025
Notification Time: 19:51 [ET]
Event Date: 08/06/2025
Event Time: 09:30 [CDT]
Last Update Date: 08/06/2025
Notification Time: 19:51 [ET]
Event Date: 08/06/2025
Event Time: 09:30 [CDT]
Last Update Date: 08/06/2025
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 SHUTTER
The following is a summary of information provided by the Louisiana Department of Environmental Quality (LDEQ) via email:
The licencee's radiation safety officer notified LDEQ of an equipment malfunction, which occurred at their facility on August 6, 2025, at approximately 0930 CDT. During a routine shutter check, the shutter of a fixed gauge became stuck in the closed position. The vendor conducted a site visit and assessment where he noted that the bolt fastening the rotor handle sheared, leaving the rotor inoperable. The shutter was left in the open position while awaiting replacement. The licensee intends to order a replacement source holder and shield, remove the existing source holder, and prepare it for disposal. The gauge shutter is now stuck in the open position. No exposures in excess of regulatory limits took place. The licensee is monitoring radiation levels around the gauge and vessel and will notify the LDEQ of incident status changes.
Device Information:
Manufacturer: VEGA
Source housing model: SH-F1A-45
Device serial number: 74127
Source serial number: 7474CO
Activity: 300 mCi
Isotope: Cs-137
Louisiana Event Report Number: LA20250005
The following is a summary of information provided by the Louisiana Department of Environmental Quality (LDEQ) via email:
The licencee's radiation safety officer notified LDEQ of an equipment malfunction, which occurred at their facility on August 6, 2025, at approximately 0930 CDT. During a routine shutter check, the shutter of a fixed gauge became stuck in the closed position. The vendor conducted a site visit and assessment where he noted that the bolt fastening the rotor handle sheared, leaving the rotor inoperable. The shutter was left in the open position while awaiting replacement. The licensee intends to order a replacement source holder and shield, remove the existing source holder, and prepare it for disposal. The gauge shutter is now stuck in the open position. No exposures in excess of regulatory limits took place. The licensee is monitoring radiation levels around the gauge and vessel and will notify the LDEQ of incident status changes.
Device Information:
Manufacturer: VEGA
Source housing model: SH-F1A-45
Device serial number: 74127
Source serial number: 7474CO
Activity: 300 mCi
Isotope: Cs-137
Louisiana Event Report Number: LA20250005
Power Reactor
Event Number: 57854
Facility: Surry
Region: 2 State: VA
Unit: [1] [] []
RX Type: [1] W-3-LP,[2] W-3-LP
NRC Notified By: Richard Post
HQ OPS Officer: Ernest West
Region: 2 State: VA
Unit: [1] [] []
RX Type: [1] W-3-LP,[2] W-3-LP
NRC Notified By: Richard Post
HQ OPS Officer: Ernest West
Notification Date: 08/06/2025
Notification Time: 21:17 [ET]
Event Date: 08/06/2025
Event Time: 18:47 [EDT]
Last Update Date: 08/06/2025
Notification Time: 21:17 [ET]
Event Date: 08/06/2025
Event Time: 18:47 [EDT]
Last Update Date: 08/06/2025
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):
Davis, Bradley (R2DO)
Davis, Bradley (R2DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | A/R | Y | 100 | Power Operation | 0 | Hot Shutdown |
AUTOMATIC REACTOR TRIP
The following information was provided by the licensee via phone and email:
"Surry Unit 1 reactor automatically tripped at 1847 EDT on August 6, 2025, due to a spurious actuation of high consequence limiting safeguards train `B' [due to a false high containment pressure trip signal]. Reactor coolant temperature is being maintained at 547 degrees Fahrenheit on the main steam dumps with main feedwater supplying the steam generators.
"All systems operated as required. The trip was uncomplicated and all control rods fully inserted into the core. Reactor protection system, emergency core cooling system, auxiliary feedwater system, emergency diesel generators, phase I and phase II containment isolation signals all actuated as designed. Offsite power remains available. There is no impact to Surry Unit 2.
"This notification is being made pursuant to 10 CFR 50.72(b)(2)(iv)(B) for 4-hour notification of reactor protection system activation and 10 CFR 50.72(b)(3)(iv)(A) for 8-hour notification of specified system actuation. The NRC Resident Inspector has been notified via cell phone."
The following information was provided by the licensee via phone and email:
"Surry Unit 1 reactor automatically tripped at 1847 EDT on August 6, 2025, due to a spurious actuation of high consequence limiting safeguards train `B' [due to a false high containment pressure trip signal]. Reactor coolant temperature is being maintained at 547 degrees Fahrenheit on the main steam dumps with main feedwater supplying the steam generators.
"All systems operated as required. The trip was uncomplicated and all control rods fully inserted into the core. Reactor protection system, emergency core cooling system, auxiliary feedwater system, emergency diesel generators, phase I and phase II containment isolation signals all actuated as designed. Offsite power remains available. There is no impact to Surry Unit 2.
"This notification is being made pursuant to 10 CFR 50.72(b)(2)(iv)(B) for 4-hour notification of reactor protection system activation and 10 CFR 50.72(b)(3)(iv)(A) for 8-hour notification of specified system actuation. The NRC Resident Inspector has been notified via cell phone."