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| Entered date | Event description | |
|---|---|---|
| ENS 46420 | 15 November 2010 18:37:00 | The following report was received via fax: The licensee uses fixed industrial gauges for measuring densities in fly ash hoppers at the Stations precipitator building. The industrial fixed gauges contain a Cesium 137 sealed source. The Cesium 137 sources were originally installed in April 1984 and at the time contained 50 milliCuries per source. The sources were manufactured and installed by Kay Ray, Inc. The gauge is Model No. 7080 and housing serial number 16785-G. The source capsule manufacturer was Amersham model no. CDC 800 and K-R ref. number serial number 15485 V. The Authorized User was performing the semi-annual 'Shutter Function Test' on Unit #3's precipitator sources. The 'external' source closure mechanism for the 3FA-1B & 2B hoppers did not operate as designed and the shutter did not close when the handle on the floor was operated. The external closure cable had detached from the shutter arms. In this condition, when the shutter closure mechanism was moved, the cable that operates the source shutter mechanism 20 feet above the floor did not move the shutter to the closed position. It should be noted that this cable is an older one which has been slated for replacement. This event happened at 11:30 am. The event was reported to the Lab Supervisor and the Radiation Safety Officer (RSO) at the Ft. Calhoun Power Station was notified. No personnel were exposed to radiation during this event. |