Event Notification Report for April 17, 2025
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
04/16/2025 - 04/17/2025
EVENT NUMBERS
57672
57672
Agreement State
Event Number: 57672
Rep Org: Illinois Emergency Mgmt. Agency
Licensee: Isomedix Operations, Inc.
Region: 3
City: Libertyville State: IL
County:
License #: IL-01123-02
Agreement: Y
Docket:
NRC Notified By: Robin Muzzalupo
HQ OPS Officer: Kerby Scales
Licensee: Isomedix Operations, Inc.
Region: 3
City: Libertyville State: IL
County:
License #: IL-01123-02
Agreement: Y
Docket:
NRC Notified By: Robin Muzzalupo
HQ OPS Officer: Kerby Scales
Notification Date: 04/18/2025
Notification Time: 13:29 [ET]
Event Date: 04/17/2025
Event Time: 00:00 [CDT]
Last Update Date: 04/18/2025
Notification Time: 13:29 [ET]
Event Date: 04/17/2025
Event Time: 00:00 [CDT]
Last Update Date: 04/18/2025
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
10 CFR Section:
Agreement State
Person (Organization):
Nguyen, April (R3DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
Nguyen, April (R3DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
AGREEMENT STATE REPORT - FAILURE OF EXIT PORTAL MONITOR
The following report was received by the Illinois Emergency Management Agency (the Agency) via phone and email:
"The corporate radiation safety officer for Isomedix Operations, Inc. (IL-01123-02) contacted the Agency on 4/18/2025 to report that during routine monthly testing of the exit portal monitor conducted on 4/17/2025, on the Co-60 pool irradiator (irradiator 192), the monitor failed to respond to radiation. The issue was immediately identified as corrosion on the cable-to-probe connection and was subsequently repaired, tested, and found to be functional. There was no report of exposure to personnel or loss of control. The licensee reported the failure within 24 hours as required by 346.830(a) and will submit a written report within 30 days as required."
Illinois Item Number: IL250017
The following report was received by the Illinois Emergency Management Agency (the Agency) via phone and email:
"The corporate radiation safety officer for Isomedix Operations, Inc. (IL-01123-02) contacted the Agency on 4/18/2025 to report that during routine monthly testing of the exit portal monitor conducted on 4/17/2025, on the Co-60 pool irradiator (irradiator 192), the monitor failed to respond to radiation. The issue was immediately identified as corrosion on the cable-to-probe connection and was subsequently repaired, tested, and found to be functional. There was no report of exposure to personnel or loss of control. The licensee reported the failure within 24 hours as required by 346.830(a) and will submit a written report within 30 days as required."
Illinois Item Number: IL250017