Event Notification Report for October 27, 2026
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
10/26/2026 - 10/27/2026
Agreement State
Event Number: 58502
Rep Org: NJ Rad Prot And Rel Prevention Pgm
Licensee: New Jersey American Water
Region: 1
City: Beverly State: NJ
County:
License #: 1073101
Agreement: Y
Docket:
NRC Notified By: Joe Power
HQ OPS Officer: Adam Koziol
Licensee: New Jersey American Water
Region: 1
City: Beverly State: NJ
County:
License #: 1073101
Agreement: Y
Docket:
NRC Notified By: Joe Power
HQ OPS Officer: Adam Koziol
Notification Date: 10/20/2026
Notification Time: 08:06 [ET]
Event Date: 10/18/2026
Event Time: 16:00 [EDT]
Last Update Date: 10/20/2026
Notification Time: 08:06 [ET]
Event Date: 10/18/2026
Event Time: 16:00 [EDT]
Last Update Date: 10/20/2026
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
10 CFR Section:
Agreement State
Person (Organization):
NMSS_EVENTS_NOTIFICATION (EMAIL)
NMSS_EVENTS_NOTIFICATION (EMAIL)
AGREEMENT STATE REPORT - MEDIA SPILL
The following is a summary of information provided by the New Jersey Department of Environmental Protection (the Department) via phone and email:
The licensee reported that on October 18, 2026, at approximately 1600 EDT, at the Cooper Street station, the primary radium treatment vessel (designed to remove radium from the water) experienced an overpressure transient and failed, releasing water and treatment media from the bottom of the vessel. The licensee operator notified their contracted service provider, who reported to the site. The service provider closed isolation valves on the radium treatment vessel and notified the radiation safety officer (RSO). The entirety of the spill was contained within the treatment plant's secondary containment structure.
The service provider estimated that the spill released approximately 31 microcuries of Ra-226 and Ra-228 based on in-service time of the treatment media. The RSO informed the licensee there was no risk to the community, environment, or site personnel. The Department responded to the site and performed surveys of the area which showed dose rates of 10-25 microrem/h, typical for a water treatment facility.
Entry to the area has been restricted to qualified employees of the service provider until a cleanup, repair, and decontamination plan can be developed and completed.
NJ incident number: C1002917
The following is a summary of information provided by the New Jersey Department of Environmental Protection (the Department) via phone and email:
The licensee reported that on October 18, 2026, at approximately 1600 EDT, at the Cooper Street station, the primary radium treatment vessel (designed to remove radium from the water) experienced an overpressure transient and failed, releasing water and treatment media from the bottom of the vessel. The licensee operator notified their contracted service provider, who reported to the site. The service provider closed isolation valves on the radium treatment vessel and notified the radiation safety officer (RSO). The entirety of the spill was contained within the treatment plant's secondary containment structure.
The service provider estimated that the spill released approximately 31 microcuries of Ra-226 and Ra-228 based on in-service time of the treatment media. The RSO informed the licensee there was no risk to the community, environment, or site personnel. The Department responded to the site and performed surveys of the area which showed dose rates of 10-25 microrem/h, typical for a water treatment facility.
Entry to the area has been restricted to qualified employees of the service provider until a cleanup, repair, and decontamination plan can be developed and completed.
NJ incident number: C1002917
Agreement State
Event Number: 58503
Rep Org: CA Department of Public Health
Licensee: RMA Group dba Certerra RMA Group
Region: 4
City: Laguna Hills State: CA
County:
License #: 8055-19
Agreement: Y
Docket:
NRC Notified By: Donald Oesterle
HQ OPS Officer: Robert A. Thompson
Licensee: RMA Group dba Certerra RMA Group
Region: 4
City: Laguna Hills State: CA
County:
License #: 8055-19
Agreement: Y
Docket:
NRC Notified By: Donald Oesterle
HQ OPS Officer: Robert A. Thompson
Notification Date: 10/20/2026
Notification Time: 16:54 [ET]
Event Date: 10/15/2026
Event Time: 00:00 [PDT]
Last Update Date: 10/20/2026
Notification Time: 16:54 [ET]
Event Date: 10/15/2026
Event Time: 00:00 [PDT]
Last Update Date: 10/20/2026
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
10 CFR Section:
Agreement State
Person (Organization):
NMSS_EVENTS_NOTIFICATION (EMAIL)
NMSS_EVENTS_NOTIFICATION (EMAIL)
AGREEMENT STATE REPORT - LOST AND FOUND GAUGE
The following information was provided by the Radiologic Health Branch (RHB) of the California Department of Public Health via email:
"On October 15, 2026, a CPN moisture density gauge (S/N M350802786) was relinquished to Maurer Technical Services, a licensed CPN calibration facility in Laguna Hills. The gauge was allegedly recovered at a swap meet by someone from The Quality Firm, aka Ambessaw Consulting, who also is licensed to possess CPN gauges. This gauge contains a 10 mCi Cs-137 sealed source and a 50 mCi Am-241/Be sealed source.
"Maurer Technical historical records of calibration of this gauge indicated it had belonged to RMA Group in Carson, CA, in 2017. The gauge was inspected and found to be damaged and corroded. The recovered gauge's serial number was not listed in the Nuclear Materials Event Database as lost or stolen.
"RHB has initiated an investigation. RMA Group will dispose of this damaged gauge through the gauge vendor."
CA incident number: 5010-101526
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 provided by the Radiologic Health Branch (RHB) of the California Department of Public Health via email:
"On October 15, 2026, a CPN moisture density gauge (S/N M350802786) was relinquished to Maurer Technical Services, a licensed CPN calibration facility in Laguna Hills. The gauge was allegedly recovered at a swap meet by someone from The Quality Firm, aka Ambessaw Consulting, who also is licensed to possess CPN gauges. This gauge contains a 10 mCi Cs-137 sealed source and a 50 mCi Am-241/Be sealed source.
"Maurer Technical historical records of calibration of this gauge indicated it had belonged to RMA Group in Carson, CA, in 2017. The gauge was inspected and found to be damaged and corroded. The recovered gauge's serial number was not listed in the Nuclear Materials Event Database as lost or stolen.
"RHB has initiated an investigation. RMA Group will dispose of this damaged gauge through the gauge vendor."
CA incident number: 5010-101526
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