Event Notification Report for July 31, 2025
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
07/30/2025 - 07/31/2025
Agreement State
Event Number: 57842
Rep Org: Wisconsin Radiation Protection
Licensee: Aspirus Wausau Hospital
Region: 3
City: Wausau State: WI
County:
License #: 073-1342-01
Agreement: Y
Docket:
NRC Notified By: Kyle Walton
HQ OPS Officer: Ossy Font
Licensee: Aspirus Wausau Hospital
Region: 3
City: Wausau State: WI
County:
License #: 073-1342-01
Agreement: Y
Docket:
NRC Notified By: Kyle Walton
HQ OPS Officer: Ossy Font
Notification Date: 07/31/2025
Notification Time: 14:47 [ET]
Event Date: 07/31/2025
Event Time: 00:00 [CDT]
Last Update Date: 07/31/2025
Notification Time: 14:47 [ET]
Event Date: 07/31/2025
Event Time: 00:00 [CDT]
Last Update Date: 07/31/2025
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 - MEDICAL EVENT
The following information was provided by the Wisconsin Department of Health Services (the Department) via email:
"On July 31, 2025, the licensee was treating the third of five fractions for a gynecological cylinder HDR (high dose rate) treatment. The authorized user placed the cylinder prior to treatment and confirmed that they believed it was snug and fully inserted. The licensee also utilized briefs with Velcro straps to hold the cylinder in place. Following the completion of the treatment, the authorized user identified that the cylinder was no longer snug, and that it had shifted by up to one centimeter. It is unclear whether the shift happened during or after treatment. The prescribed dose was 6 Gy for the fraction. The licensee performed a dose reconstruction and determined that if the cylinder had shifted immediately, the cervix would have only received 2.6 Gy (44 percent) of the dose. The licensee believes that the shift would not have resulted in a dose to other organs above regulatory limits, and that the completion of the remaining fractions will result in the desired clinical outcome. The authorized user notified the patient immediately. The Department will perform an investigation."
Wisconsin Item Number: WI250007
A Medical Event may indicate potential problems in a medical facility's use of radioactive materials. It does not necessarily result in harm to the patient.
The following information was provided by the Wisconsin Department of Health Services (the Department) via email:
"On July 31, 2025, the licensee was treating the third of five fractions for a gynecological cylinder HDR (high dose rate) treatment. The authorized user placed the cylinder prior to treatment and confirmed that they believed it was snug and fully inserted. The licensee also utilized briefs with Velcro straps to hold the cylinder in place. Following the completion of the treatment, the authorized user identified that the cylinder was no longer snug, and that it had shifted by up to one centimeter. It is unclear whether the shift happened during or after treatment. The prescribed dose was 6 Gy for the fraction. The licensee performed a dose reconstruction and determined that if the cylinder had shifted immediately, the cervix would have only received 2.6 Gy (44 percent) of the dose. The licensee believes that the shift would not have resulted in a dose to other organs above regulatory limits, and that the completion of the remaining fractions will result in the desired clinical outcome. The authorized user notified the patient immediately. The Department will perform an investigation."
Wisconsin Item Number: WI250007
A Medical Event may indicate potential problems in a medical facility's use of radioactive materials. It does not necessarily result in harm to the patient.
Power Reactor
Event Number: 57844
Facility: Calvert Cliffs
Region: 1 State: MD
Unit: [1] [2] []
RX Type: [1] CE,[2] CE
NRC Notified By: Kerry Hummer
HQ OPS Officer: Tenisha Meadows
Region: 1 State: MD
Unit: [1] [2] []
RX Type: [1] CE,[2] CE
NRC Notified By: Kerry Hummer
HQ OPS Officer: Tenisha Meadows
Notification Date: 07/31/2025
Notification Time: 23:59 [ET]
Event Date: 07/31/2025
Event Time: 17:44 [EDT]
Last Update Date: 08/01/2025
Notification Time: 23:59 [ET]
Event Date: 07/31/2025
Event Time: 17:44 [EDT]
Last Update Date: 08/01/2025
Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(3)(v)(D) - Accident Mitigation
10 CFR Section:
50.72(b)(3)(v)(D) - Accident Mitigation
Person (Organization):
Bickett, Carey (R1DO)
Bickett, Carey (R1DO)
| 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 |
BOTH TRAINS OF CONTROL ROOM EMERGENCY VENTILATION/CONTROL ROOM EMERGENCY TEMPERATURE SYSTEM INOPERABLE
The following information was provided by the licensee via phone and email:
"At 1744 EDT, on 7/31/2025, it was discovered both trains of control room emergency ventilation (CREVS) and control room emergency temperature system (CRETS) were simultaneously inoperable due to a damper going shut in the control room ventilation system. The damper went back to its normal open position in less than a minute. Due to this inoperability, the system was in a condition that could have prevented the fulfillment of a safety function; therefore, this condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v)(D). 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:
Multiple technical specification limiting conditions for operation (LCOs) such as LCO 3.0.3, 3.7.8, and 3.7.9 were entered as a result of this event.
The following information was provided by the licensee via phone and email:
"At 1744 EDT, on 7/31/2025, it was discovered both trains of control room emergency ventilation (CREVS) and control room emergency temperature system (CRETS) were simultaneously inoperable due to a damper going shut in the control room ventilation system. The damper went back to its normal open position in less than a minute. Due to this inoperability, the system was in a condition that could have prevented the fulfillment of a safety function; therefore, this condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v)(D). 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:
Multiple technical specification limiting conditions for operation (LCOs) such as LCO 3.0.3, 3.7.8, and 3.7.9 were entered as a result of this event.