The following information was obtained from the state of
Iowa via email:
On August 18, 2021, at approximately 1000 CDT, the DAV-015 #4 shutter was reported to be stuck in the open position. A survey meter measured a background level of 0.02 mR/hr outside of the gauge house, and 0.05 mR/hr inside the gauge house at that time. Locks were changed to the gauge house to prevent entry. The service company, SenTek, was notified and requested to provide service. They are expected to arrive on August 19, 2021, to provide service and repairs. This event will be updated after the service company determines the cause of the failure and the licensee provides a corrective action plan.
The gauge was manufactured by Isotope Measuring Systems, Inc., model number 5221-02, serial number 2332-2336L, and contains 5 Curies of Am-241.
NMED Number: IA210003
- * * UPDATE ON 9/2/21 AT 1522 EDT FROM RANDAL DAHLIN TO JOANNA BRIDGE * * *
The following information was obtained from the state of Iowa via email:
The SenTek service technician arrived onsite late afternoon on August 18, 2021 and determined that the bolts holding the shutter had sheared and needed to be replaced. All other shutter bolts were inspected and found to be satisfactory. As a corrective action, the licensee is implementing an annual preventative maintenance check to inspect and replace the bolts on all shutters. The licensee's intent is to replace these fixed gauging devices with x-ray tube devices.
The State considers this event closed.
Notified: R3DO (Riemer) and
NMSS Events Notification via e-mail.