Event Notification Report for August 08, 2023
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
08/07/2023 - 08/08/2023
Non-Agreement State
Event Number: 56646
Rep Org: City Of Great Falls
Licensee: City Of Great Falls
Region: 4
City: Great Falls State: MT
County: Cascade
License #: 25-15247-01
Agreement: N
Docket:
NRC Notified By: Matt Troud
HQ OPS Officer: John Russell
Notification Date: 07/31/2023
Notification Time: 12:01 [ET]
Event Date: 07/31/2023
Event Time: 07:30 [MDT]
Last Update Date: 07/31/2023
Emergency Class: Non Emergency
10 CFR Section:
30.50(b)(2) - Safety Equipment Failure
Person (Organization):
Azua, Ray (R4DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
Event Text
TROXLER MOISTURE DENSITY GAUGE INADVERTENTLY BUMPED BY TRUCK
The following summary information was provided by the licensee via telephone:
On 7/31/2023 at about 0730 MDT, employees of the City of Great Falls were standardizing a Troxler moisture density gauge (contained 9 millicuries of cesium-137 and 44 millicuries of americium-241) with the gauge on an asphalt lot and the source in its cage; as per standard practice. A loader truck inadvertently hit the gauge but was halted before it ran over the gauge. Some plastic on the gauge was damaged. The licensee halted operations and restricted access. Subsequently, radiation levels of 0.294 millirem per hour at 1 foot and 0.004 millirem per hour at 4 feet were measured, which were essentially background levels. No overexposure or other personnel injury were reported.
Agreement State
Event Number: 56649
Rep Org: OR Dept of Health Rad Protection
Licensee: Georgia-Pacific Toledo LLC
Region: 4
City: Toledo State: OR
County:
License #: ORE-90708
Agreement: Y
Docket:
NRC Notified By: Todd Carpenter
HQ OPS Officer: Bill Gott
Notification Date: 08/01/2023
Notification Time: 14:30 [ET]
Event Date: 08/01/2023
Event Time: 08:30 [PDT]
Last Update Date: 08/01/2023
Emergency Class: Non Emergency
10 CFR Section:
Agreement State
Person (Organization):
Azua, Ray (R4DO)
NMSS_EVENTS_NOTIFICATION (EMAIL)
Event Text
AGREEMENT STATE REPORT - GAUGE SHUTTER STUCK SHUT
The following is a summary of the information provided by the Oregon Health Authority via email:
At 0830 PDT on August 1, 2023, during the 6-month shutter check and 3-year wipe test on the number 1 digestor level source, the licensee discovered a corroded shear pin that allowed the lever to detach from the source, leaving the source in the closed position. The current state of the source was verified closed with a survey meter. The licensee repaired the sheer pin and tested the mechanism. The source was working correctly and returned to service by 0922 PDT.