The following report was received from the state via e-mail:
Nucor Steel Company informed the [Arkansas] Department [of Health] that they had a stuck shutter on one of their caster sources. The licensee utilized a lifting mechanism that allowed the technicians to lift and move the source without being near the source. The source and source holder were placed in an appropriate container and surveys were performed. The highest reading on the storage container with the shutter open at contact was 120 MicroR/hour.
The storage container was relocated to a remote area on the casting deck and surveys were performed. A source service provider was contacted and arrived on site the next day to evaluate the problem.
Source: Berthold Model LB 300 MLT, Serial number 730-4-97, 36 mCi of Co-60 used for mold level control.
On 02/12/2009, at 10:01 AM the licensee provided the Department with a more detailed description of the steps taken by the technicians during the event, storage of the source, exposure reading at the source, and security of the source at this time. The licensee is currently awaiting feedback from the gauge service provider.
The Department will leave this report open pending receipt of a final written report from the licensee, due in 30 days.
Arkansas Report: 09-02-01
- * * UPDATE FROM ROBERT PEMBERTON (VIA EMAIL) TO HOWIE CROUCH ON 4/17/09 @ 1119 EDT * * *
The following are the findings of Arkansas Department of Health [ADH], Radioactive Materials Program, concerning event Number 44847 at NUCOR Steel in Armorel, AR. From information provided by NUCOR Steel and JENDCO Corporation, the Department [ADH] has determined this event was caused by a small metal chip that interfered with the rotation of the shutter. The Department has concluded that the root cause of this incident is mechanical failure. The Department considers this incident to be closed.
Notified
FSME (Flannery) and R4DO (Whitten).