The following information was received from the state of
Minnesota via email:
It has come to our attention during our IMPEP review that we have some events that were not directly reported to the HOO as required. They were reported to NMED, but we are now reporting them directly to the HOO.
Certainteed Corporation reported that the shutter on a fixed nuclear gauge (Thermo EGS model SCL-1C, serial #UX458) failed to close on 5/11/2017. The gauge contained a 3.7 GBq (100 milliCi) Sr-90 source (Eckert & Ziegler model SIF.D1). The area within 15 feet of the gauge was cordoned off. Certainteed contacted the manufacturer and arrangements were made for Thermo EGS to inspect and service the gauge on 5/12/2017. The cause of the event was determined to be a broken pin on the mechanical plate that controls the on-off indicator light. The pin was repaired and the shutter mechanism was tested and performed properly. The Minnesota Department of Health conducted an onsite visit.
Minnesota event number: 170004