Event Notification Report for August 11, 2025
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
08/10/2025 - 08/11/2025
Power Reactor
Event Number: 57859
Facility: Summer
Region: 2 State: SC
Unit: [1] [] []
RX Type: [1] W-3-LP,[2] W-AP1000,[3] W-AP1000
NRC Notified By: Howard Garrett
HQ OPS Officer: Josue Ramirez
Region: 2 State: SC
Unit: [1] [] []
RX Type: [1] W-3-LP,[2] W-AP1000,[3] W-AP1000
NRC Notified By: Howard Garrett
HQ OPS Officer: Josue Ramirez
Notification Date: 08/11/2025
Notification Time: 09:51 [ET]
Event Date: 08/11/2025
Event Time: 02:12 [EDT]
Last Update Date: 08/11/2025
Notification Time: 09:51 [ET]
Event Date: 08/11/2025
Event Time: 02:12 [EDT]
Last Update Date: 08/11/2025
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):
Davis, Bradley (R2DO)
Davis, Bradley (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 |
AUTOMATIC ACTUATION OF THE 'A' EMERGENCY DIESEL GENERATOR
The following information was provided by the licensee via phone and email:
"On August 11, 2025, at 0212 EDT, VC Summer Unit 1 was in Mode 1 at 100 percent power when the 'A' emergency diesel generator (XEG0001A) automatically actuated in response to undervoltage indications on Bus `1 DA'. Bus `1 DA' remained energized from its normal offsite power source. The XEG0001A was secured at 0302 EDT and realigned for auto start.
"Dominion Energy South Carolina (DESC) is actively investigating to determine the cause of the transient at this time.
"This event is being reported as eight-hour notification in accordance with 10 CFR 50.72(b)(3)(iv)(A) as an event that results in a valid actuation of the 'A' emergency diesel generator."
The NRC Resident Inspector was notified.
The following information was provided by the licensee via phone and email:
"On August 11, 2025, at 0212 EDT, VC Summer Unit 1 was in Mode 1 at 100 percent power when the 'A' emergency diesel generator (XEG0001A) automatically actuated in response to undervoltage indications on Bus `1 DA'. Bus `1 DA' remained energized from its normal offsite power source. The XEG0001A was secured at 0302 EDT and realigned for auto start.
"Dominion Energy South Carolina (DESC) is actively investigating to determine the cause of the transient at this time.
"This event is being reported as eight-hour notification in accordance with 10 CFR 50.72(b)(3)(iv)(A) as an event that results in a valid actuation of the 'A' emergency diesel generator."
The NRC Resident Inspector was notified.
Agreement State
Event Number: 57911
Rep Org: MA Radiation Control Program
Licensee: Baystate Health
Region: 1
City: Springfield State: MA
County:
License #: 60-0095
Agreement: Y
Docket:
NRC Notified By: Bob Locke
HQ OPS Officer: Josue Ramirez
Licensee: Baystate Health
Region: 1
City: Springfield State: MA
County:
License #: 60-0095
Agreement: Y
Docket:
NRC Notified By: Bob Locke
HQ OPS Officer: Josue Ramirez
Notification Date: 09/09/2025
Notification Time: 13:36 [ET]
Event Date: 08/11/2025
Event Time: 11:00 [EDT]
Last Update Date: 09/09/2025
Notification Time: 13:36 [ET]
Event Date: 08/11/2025
Event Time: 11:00 [EDT]
Last Update Date: 09/09/2025
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
10 CFR Section:
Agreement State
Person (Organization):
Ford, Monica (R1DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
ILTAB, (EMAIL) (EMAIL)
Ford, Monica (R1DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
ILTAB, (EMAIL) (EMAIL)
AGREEMENT STATE REPORT - LOST I-125 SEED
The following information was received from the Massachusetts Radiation Control Program (the Agency) via email:
"On August 11, 2025, three radioactive iodine-125 sealed sources (seeds) were removed from a patient receiving a radioactive seed localization procedure. The licensee expected to remove four I-125 seeds, which were placed in the patient on August 8, 2025, but only located three of the seeds.
"The missing seed was not located after extensive surveys of the patient, staff, and all areas where the seed may have been misplaced. The seed has not been located at this time.
"This is a 30-day reporting requirement per [Code of Massachusetts Regulations] 105 CMR 120.281(A)(2), missing licensed radioactive materials in aggregate quantity equal to or greater than 10 times quantity specified in 105 CMR 120.297, Appendix C.
"The Agency considers this event to be open."
Manufacturer: IsoAid, LLC
Model: IAI-125A
Source: 0.181 mCi I-125
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 information was received from the Massachusetts Radiation Control Program (the Agency) via email:
"On August 11, 2025, three radioactive iodine-125 sealed sources (seeds) were removed from a patient receiving a radioactive seed localization procedure. The licensee expected to remove four I-125 seeds, which were placed in the patient on August 8, 2025, but only located three of the seeds.
"The missing seed was not located after extensive surveys of the patient, staff, and all areas where the seed may have been misplaced. The seed has not been located at this time.
"This is a 30-day reporting requirement per [Code of Massachusetts Regulations] 105 CMR 120.281(A)(2), missing licensed radioactive materials in aggregate quantity equal to or greater than 10 times quantity specified in 105 CMR 120.297, Appendix C.
"The Agency considers this event to be open."
Manufacturer: IsoAid, LLC
Model: IAI-125A
Source: 0.181 mCi I-125
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