ENS 50042
ENS Event | |
|---|---|
05:00 Apr 16, 2014 | |
| Title | Agreement State Report - Radiography Camera Failure of Source to Retract to Safe Position |
| Event Description | The following was received from the State of Illinois via email:
On Wednesday at midday, the Regional Radiation Safety Officer (RSO) for the licensee's South Roxana, IL area was called by their two man crew working at the WRB Refinery in Roxana, IL. The crew reported that following a sixth 'shot' on an elevated tank from an overhead platform, the source to the radiography camera would not retract into the safe position. The source had previously been 'run out' to a distance of just over 7 feet into a collimator, and although the crank and assembly rotated freely without notable restriction through two ninety degree turns, the source would not enter the camera. The crew reported that the guide tube had not been affected during the previous shots and noted that the equipment had regularly passed the routine maintenance inspection prior to that day. The Regional RSO assembled his emergency response equipment kit and arrived at the site approximately 30 minutes later. The crew had maintained a perimeter and advised responsible site safety personnel of the matter with instructions to ensure the affected area was to remain off limits until the situation was resolved. The Regional RSO inspected the guide tube and set up and like the crew was unable to retract the source. Calls were then placed to the company's regional management and to the Illinois Emergency Management Agency to advise of the situation. The set up was disassembled and the collimated end point placed into a shielded configuration using bags of lead shot so that the full length of the guide tube could be more closely inspected. Minor dents and obstructions of the guide tube were noted and although when corrected by the Regional RSO, would still not allow the source to be safely returned. With the help of the radiography crew, the camera and guide tube assembly was subsequently moved to a more accessible lower platform by the Regional RSO to allow for additional inspection and to create a more direct path. The source however would still not retract into the camera. Dose rates with the source in the collimator were measured as 390 millirem at 8 feet and 695 millirem at 6 feet which was the closest distance the Regional RSO remained in. Additional support from the regional office was requested to thoroughly patrol the boundaries of the area as it appeared additional time was going to be required and the camera would need to be lowered further to gain better access for potential repairs. While additional equipment was being collected from the regional office, the manufacturer was advised of the situation and consulted. The manufacturer suggested the issue may lie with the drive cables from the reserve crank end and they would likely have to be disconnected from the source cable. When the additional equipment arrived, the crank housing was disconnected from the camera following the manufacturer's suggestion and from a distance, the cable was manually retracted. The source subsequently was returned to the shielded and locked position with no further difficulties. The total time for recovery was approximately two and a half hours. Later, close inspection of the drive crank assembly showed that the reserve section of the crank had been subjected to heat or burned such that the exterior plastic covering had melted along approximately 3 inches of its length. Upon testing, this damaged section prohibited movement of the cable past this point. It's surmised that the crank assembly may have come to rest against an uninsulated section of the piping while taking shots that morning at the refinery that led to the burning/melting of the protective covering over the braided cable which led to the inability to retract the source. A check of the Regional RSO direct reading dosimeter showed less than 80 millirem as a result of the recovery operation. Members of the radiography crew received a total dose for the day of less than 100 millirem. The camera was last inspected by the manufacturer on March 14, 2014 and the manufacturer's associated equipment on February 4, 2014 by the Regional RSO. The associated equipment is being returned to the manufacturer for evaluation and repair/replacement. Illinois event # IL14007 |
| Where | |
|---|---|
| Team Industrial Services Roxana, Illinois (NRC Region 3) | |
| License number: | IL 01136-01 |
| Organization: | Illinois Emergency Mgmt. Agency |
| Reporting | |
| Agreement State | |
| Time - Person (Reporting Time:+32.88 h1.37 days <br />0.196 weeks <br />0.045 months <br />) | |
| Opened: | Daren Perrero 13:53 Apr 17, 2014 |
| NRC Officer: | Daniel Mills |
| Last Updated: | Apr 17, 2014 |
| 50042 - NRC Website | |
Team Industrial Services with Agreement State | |
WEEKMONTHYEARENS 523492016-11-03T04:00:0003 November 2016 04:00:00
[Table view]Agreement State Agreement State Report - Failure of Source to Retract to Safe Position ENS 511802015-06-25T13:30:00025 June 2015 13:30:00 Agreement State Agreement State Report - Lost Radiography Camera During Transit ENS 508442015-02-23T06:00:00023 February 2015 06:00:00 Agreement State Agreement State Report - Damaged Guide Tube on Radiography Camera Preventing Source Retraction ENS 505722014-10-28T04:00:00028 October 2014 04:00:00 Agreement State Agreement State Report - Radiography Camera Source Can Not Be Retracted ENS 501072014-05-06T04:00:0006 May 2014 04:00:00 Agreement State Agreement State Report - Radiography Camera Source Disconnect ENS 500422014-04-16T05:00:00016 April 2014 05:00:00 Agreement State Agreement State Report - Radiography Camera Failure of Source to Retract to Safe Position ENS 484172012-10-16T05:00:00016 October 2012 05:00:00 Agreement State Agreement State Report - Radiography Camera Source Disconnect ENS 480252012-05-22T07:00:00022 May 2012 07:00:00 Agreement State Agreement State Report - Camera Source Fails to Retract ENS 467502011-04-12T14:35:00012 April 2011 14:35:00 Agreement State Agreement State Report - Fire in Portable Darkroom ENS 464302010-11-21T18:00:00021 November 2010 18:00:00 Agreement State Agreement State Report - Source Disconnect and Retrieval ENS 463162010-10-03T05:00:0003 October 2010 05:00:00 Agreement State Agreement State - Radiography Source Failed to Retract ENS 458182010-04-07T05:00:0007 April 2010 05:00:00 Agreement State Agreement State - Radiography Truck Involved in Auto Accident ENS 453852009-09-25T19:00:00025 September 2009 19:00:00 Agreement State Agreement State Report - Source Disconnected from Radiography Camera ENS 444932008-09-16T05:00:00016 September 2008 05:00:00 Agreement State Radiography Camera Source Failed to Return to Safe Position ENS 443692008-07-25T05:00:00025 July 2008 05:00:00 Agreement State Agreement State Report - Radiography Camera Malfunction ENS 441452008-04-17T05:00:00017 April 2008 05:00:00 Agreement State Radiography Camera Malfunction ENS 440192008-02-28T06:00:00028 February 2008 06:00:00 Agreement State Agreement State Report - Overexposed Personnel Monitoring Badge ENS 435042007-07-18T15:00:00018 July 2007 15:00:00 Agreement State Agreement State Report - Defective Radiography Camera ENS 426192006-06-02T14:30:0002 June 2006 14:30:00 Agreement State Agreement State Report - Personnel Overexposure 2016-11-03T04:00:00 | |