Part 21 Report - 1996-090

ACCESSION #: 9512180157 P. O. Box 5247 Omnitron 3409 West Prien Lake Road International, Inc. Telephone: (318) 474-0505 Lake Charles, Louisiana 70606 Fax: (318) 478-6218 December 6, 1995 Document Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555 Re: Part 21 - Reporting of Defects and Noncompliance Omnitron Report # 0101 Addendum Subject: Incident at Indiana Regional Cancer Center, November 1992 NRC Report NUREG-1480 Dear Madam or Sir: Pursuant to 10 CFR 21 and a request from Mr. Larry W. Camper, Office of Nuclear Materials Safety and Safeguards, Omnitron International Inc., reports the following additional information to be added to the report dated March 16, 1993: Device Model 2000 HDR Treatment System, Afterloader S/N 100, Source Wire, Model SL 777. Additional Information In response to NRC comments the Afterloader software has been changed as follows: After any emergency DC motor retraction, the Afterloader is inoperable until serviced, an alarm is sounded, and below error message is displayed in a red box on the console monitor screen until cleared by medical personnel: CHECK RAD MONITOR, Backup retract motor activated POSSIBLE EMERGENCY!, verify source in safe UNRESETTABLE ERROR - - CALL OMNITRON SERVICE CENTER During an emergency DC motor retraction the length of the wire is not recorded as all components that could in any way restrict the movement of the wire are retracted from making contact with the wire. This retraction includes the encoders that measure the wire length. This is as designed to ensure that the DC motor will always be capable of pulling the active wire back. Letter to U. S. NRC, 12/06/1995 Page 2 The above change was implemented in September of 1993 and all licensed users were notified of the change. This change was not implemented as a result of any failure of the system but was done to further assist medical personnel to understand what should be done when the Backup Retract Motor activates. Omnitron will be responsive to any comments or suggestions the NRC may have regarding this report. Regards, Sam Lott, Ph.D. RSO SL/ae *** END OF DOCUMENT ***

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