GAUGE SHUTTER MALFUNCTION
"On March 21, 2018, at approximately 0300 CDT the shutter on an industrial beta transmission gauge malfunctioned and did not immediately close when commanded to do so. Facility maintenance personnel were able to get the shutter to fully close. The gauge was taken out of service. At approximately 0800 CDT the facility maintenance technician with the most experience working with radiation gauges inspected the device and found that the shutter opened properly, but would not fully close. The licensed service provider under contract to the facility was contacted and provided advice to the facility technician so that the shutter could be fully closed. The facility Radiation Safety Officer verified that the shutter was fully closed using a portable radiation survey meter. Electrical power to the device was locked out to prevent use. The gauge manufacturer was contacted to provide advice and to provide a replacement shutter assembly to be installed by the licensed service provider that the facility uses for more extensive maintenance on radiation gauges.
"Isotope, quantity, chemical and physical form:
"Kr-85, 1000 millicuries on January 8, 2007, encapsulated sealed source, serial number 05-709, QSA Global model KAC.D1, in LFE model SULP-77A beta thickness gauge, serial number 9281
"The event resulted in no radiation exposure to any individual." |