Event Notification Report for July 22, 2025
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
07/21/2025 - 07/22/2025
Power Reactor
Event Number: 57822
Facility: Susquehanna
Region: 1 State: PA
Unit: [1] [] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: Ken Hulbert
HQ OPS Officer: Brian P. Smith
Region: 1 State: PA
Unit: [1] [] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: Ken Hulbert
HQ OPS Officer: Brian P. Smith
Notification Date: 07/22/2025
Notification Time: 17:22 [ET]
Event Date: 07/22/2025
Event Time: 15:10 [EDT]
Last Update Date: 07/22/2025
Notification Time: 17:22 [ET]
Event Date: 07/22/2025
Event Time: 15:10 [EDT]
Last Update Date: 07/22/2025
Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(2)(iv)(A) - ECCS Injection 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)(A) - ECCS Injection 50.72(b)(2)(iv)(B) - RPS Actuation - Critical 50.72(b)(3)(iv)(A) - Valid Specif Sys Actuation
Person (Organization):
Dentel, Glenn (R1DO)
Dentel, Glenn (R1DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | M/R | Y | 96 | Power Operation | 0 | Hot Shutdown |
MANUAL REACTOR SCRAM
The following information was provided by the licensee via phone and email:
"At 1510 [EDT] with Unit 1 in mode 1 at 96 percent reactor power, the reactor was manually scrammed due to loss of main transformer cooling. The scram was not complex, all systems responded normally post-scram. Main turbine bypass valves opened automatically to maintain reactor pressure.
"Operations responded to stabilize the plant. High pressure coolant injection momentarily injected into the reactor vessel and was subsequently placed in standby. Reactor water level has stabilized and is being maintained with the '1B' reactor feed pump. Decay heat is being removed by discharging steam to the main condenser using the turbine bypass valves. Unit 2 was not impacted. Due to the reactor protection system actuation while critical and the emergency core coolant system discharge to the reactor coolant system, this event is being reported as a four-hour and eight-hour non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B), 10 CFR 50.72{b){2)(iv)(A), and 10 CFR 50.72(b)(3)(iv)(A).
"The Unit 1 reactor is currently stable in mode 3. An investigation is in progress into the cause of the loss of main transformer cooling. There was no impact to the health or safety of the public or plant personnel. The NRC Resident Inspector has been informed. The state of Pennsylvania has been informed."
The following information was provided by the licensee via phone and email:
"At 1510 [EDT] with Unit 1 in mode 1 at 96 percent reactor power, the reactor was manually scrammed due to loss of main transformer cooling. The scram was not complex, all systems responded normally post-scram. Main turbine bypass valves opened automatically to maintain reactor pressure.
"Operations responded to stabilize the plant. High pressure coolant injection momentarily injected into the reactor vessel and was subsequently placed in standby. Reactor water level has stabilized and is being maintained with the '1B' reactor feed pump. Decay heat is being removed by discharging steam to the main condenser using the turbine bypass valves. Unit 2 was not impacted. Due to the reactor protection system actuation while critical and the emergency core coolant system discharge to the reactor coolant system, this event is being reported as a four-hour and eight-hour non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B), 10 CFR 50.72{b){2)(iv)(A), and 10 CFR 50.72(b)(3)(iv)(A).
"The Unit 1 reactor is currently stable in mode 3. An investigation is in progress into the cause of the loss of main transformer cooling. There was no impact to the health or safety of the public or plant personnel. The NRC Resident Inspector has been informed. The state of Pennsylvania has been informed."
Agreement State
Event Number: 57825
Rep Org: Illinois Emergency Mgmt. Agency
Licensee: Rush University Medical Center
Region: 3
City: Chicago State: IL
County:
License #: IL-01766-01
Agreement: Y
Docket:
NRC Notified By: Gary Forsee
HQ OPS Officer: Ernest West
Licensee: Rush University Medical Center
Region: 3
City: Chicago State: IL
County:
License #: IL-01766-01
Agreement: Y
Docket:
NRC Notified By: Gary Forsee
HQ OPS Officer: Ernest West
Notification Date: 07/24/2025
Notification Time: 16:01 [ET]
Event Date: 07/22/2025
Event Time: 00:00 [CDT]
Last Update Date: 07/24/2025
Notification Time: 16:01 [ET]
Event Date: 07/22/2025
Event Time: 00:00 [CDT]
Last Update Date: 07/24/2025
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
10 CFR Section:
Agreement State
Person (Organization):
Zurawski, Paul (R3DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
Zurawski, Paul (R3DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
AGREEMENT STATE REPORT - MEDICAL EVENT
The following information was provided by the Illinois Emergency Management Agency (the Agency) via phone and email:
"The Agency was contacted on July 23, 2025, by Rush University Medical Center in Chicago to advise of an administration of Y-90 Theraspheres which resulted in an underdose exceeding 20 percent. The incident occurred on July 22, 2025. No untoward medical impact to the patient is expected.
"The Agency was contacted by the radiation safety officer for Rush University Medical Center (radioactive materials license: IL-01766-01), on July 23, 2025, to report that a patient prescribed 47.42 mCi of Y-90 Theraspheres on July 22, 2025, received only 36.81 mCi of the prescribed dose.
"The patient has been notified, and inspectors will verify that the referring physician was notified during a reactive inspection scheduled to occur on July 29, 2025. There was no reported adverse impact to the patient. The licensee reported using a smaller than recommended catheter due to the area being treated. The underdose (22.4 percent deviation between the prescribed and administered dose) meets the criteria as a reportable event under 32 Illinois Administrative Code 335.1080. The prescribed and administered dose (in terms of Gy) will be confirmed on site. The investigation remains ongoing. This medical event will be reported to the NRC Operations Center today, July 24, 2025."
Illinois item number: IL250029
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 Illinois Emergency Management Agency (the Agency) via phone and email:
"The Agency was contacted on July 23, 2025, by Rush University Medical Center in Chicago to advise of an administration of Y-90 Theraspheres which resulted in an underdose exceeding 20 percent. The incident occurred on July 22, 2025. No untoward medical impact to the patient is expected.
"The Agency was contacted by the radiation safety officer for Rush University Medical Center (radioactive materials license: IL-01766-01), on July 23, 2025, to report that a patient prescribed 47.42 mCi of Y-90 Theraspheres on July 22, 2025, received only 36.81 mCi of the prescribed dose.
"The patient has been notified, and inspectors will verify that the referring physician was notified during a reactive inspection scheduled to occur on July 29, 2025. There was no reported adverse impact to the patient. The licensee reported using a smaller than recommended catheter due to the area being treated. The underdose (22.4 percent deviation between the prescribed and administered dose) meets the criteria as a reportable event under 32 Illinois Administrative Code 335.1080. The prescribed and administered dose (in terms of Gy) will be confirmed on site. The investigation remains ongoing. This medical event will be reported to the NRC Operations Center today, July 24, 2025."
Illinois item number: IL250029
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.