United States Nuclear Regulatory Commission - Protecting People and the Environment

ACCESSION #: 9603130277

Nucletron - Oldelft                     Nucletron - Oldelft Corporation
                                          7080 Columbia Gateway Drive
                                        Columbia, Maryland 21046-2133

                                          Telephone: 410-312-4100
                                             Fax: 410-312-4199
March 12, 1996

Director, Office of Enforcement
U. S.  Nuclear Regulatory Commission
ATTN: Document Control Desk
Washington, D.C.  20555
Dear Sirs:

The following pages are submitted for your review in compliance with I
10CFR Section 21.21, Report of Defect.

Should you have any questions or concerns in this matter after review of
this information, please feel free to contact the undersigned directly.


Stephen P. Teague
Director of Regulatory Affairs/R.S.O.

enclosure:     Report of Defect

cc: Region III N.R.C. Office


ACCESSION #:  9603130283



microSelectron-High Dose Rate Remote

Memorial Medical Center

January 9, 1996

Prepared by:

S.  P.  Teague
Director of Regulatory Affairs
Nucletron-Oldelft Corporation

In compliance with 10CFR Section 21.21 Nucletron-Oldelft Corporation is
submitting the following report with attachments as listed on the Table
of Contents Page.

Submitted by:                           Date of Report:

Stephen P.  Teague                      March 12, 1996
Director of Regulatory Affairs
Nucletron-Oldelft Corporation

Facility:                               Device:

Memorial Medical Center                 microSelectron-HDR S/N 9003
800 North Rutledge                      S & D No.  MD-497-D-104S
Springfield, IN 62781

Device Supplier:                        Device Installer:

Nucletron-Oldelft International B.V.    Nucletron-Oldelft Corporation
Waardgelder 1                           7080 Columbia Gateway Drive
3905 TH Veenendaal                      Columbia, Maryland 21046

Nature of Defect:

See Attached

Initial Notification:

a.  By facility          January 9, 1996

Installed Base:

See Appendix I (User List)

Corrective Action Plan:

a.  Action:              Replace defective board
b.  Responsible Party    Nucletron-Oldelft Corporation
c.  Time Schedule        Immediate

Final Notification:

a.  to facility          March 13, 1996
b.  to NRC OPS Center    March 13, 1996
c.  to Regional Office   March 13, 1996
d.  Maryland State DOE   March 13, 1996


The preparation of this report is authorized individual:

Date                     Stephen P. Teague
                         Director of Regulatory Affairs

                            TABLE OF CONTENTS

History of Event

Failure Analysis



Corrective Action

Appendix I - User List

Appendix II - Safety Alert

I.  History of Event

On January 9, 1996, Nucletron-Oldelft Corporation was advised via
telephone by Memorial Medical Center in Springfield, Indiana that the
display failed to update treatment information.  The microSelectron-HDR
Treatment Control Unit was unable to display or print current status of
the treatment.  The operator responded by pressing the Interrupt button
at that time.  The button failed to retract the source.  The operator
opened the door to the treatment room.  This interlock failed to retract
the source.  The operator turned the Emergency hand crank and the source
retracted under machine control.  The unit was removed from service
pending the arrival of a Nucletron service engineer.  On January 12,
1996, a service engineer on site attempted to duplicate the condition
that existed, without success.

II.  Failure Analysis

The system was tested extensively and all functions performed within
normal limits.  All door switches and Emergency Stop switches functioned
correctly.  The service engineer was unable to duplicate the error
condition.  The CPU board was removed for failure analysis by the
manufacturer (supplier).  Results of this investigation are not yet

III.  Conclusion

The CPU board was replaced and extensive cycling performed.  There was no
indication that the problem reoccurred.  The unit was returned to the
customer for Quality Assurance testing prior to being placed in clinical

IV.  Summary

A microSelectron-HDR failed in the communication between the control unit
and the Treatment Unit.  This failure prevented both the Interrupt button
and door interlock switch from retracting the source.  The Emergency Stop
button was not pressed by the operator prior to entering the treatment

V.  Corrective Action

The CPU board has been shipped to the manufacture for failure analysis.
A Safety Alert has been sent to all North American Users of the
microSelectron-HIDR and microSelectron-PDR devices.

     Investigated into redesign of firmware or hardware is ongoing to
prevent door interlock failures due to communication problems.


                               APPENDIX II

                              Safety Alert

                                        Nucletron - Oldelft Corporation
nucletron - Oldelft                       7080 Columbia Gateway Drive
                                         Columbia, Maryland 21046-2133

                                             Telephone: 410-312-4100
                                                 Fax: 410-312-4199

March 4, 1996

Dear Nucletron microSelectron HDR & PDR Users:

Your attention is directed to the attached Safety Alert describing a
situation that may occur in routine operation of the device.  This alert
is based on an event that occurred recently at a facility using this
device.  Please follow the instructions contained in this Alert to
prevent loss of treatment data and potential radiation exposure to

If you have any questions regarding this Safety Alert or the procedure to
be followed, please call the 1-800 number listed that the bottom of the
Safety Alert.


Stephen P. Teague
Director of Regulatory Affairs

Attachment: Safety Alert # 300.074

nucletron - Oldelft                          Safety Alert

                                                  Validity: mHDR/mPDR

Situation                               Solution

During normal treatment operation,      If the display on the Control
the micro-Selectron HDR and PDR         Unit stops updating the status
control unit may freeze up.             of the treatment, the operator
The door switch and interrupt           is required to perform the
buttons may be inoperative during       following steps in sequence:
these situations The printer will
stop printing the record of dwell       1. Depress the Interrupt button,
positions and treatment times              and then
                                        2. Depress the Master Emergency
                                           Stop button.

                                        3. Note the exact time that the
                                           display stopped and the
Cause                                      condition of all lamps,
                                           keyswitches, and
The exact cause is uncertain at            information shown on display.
this time, but is believed to be a
momentary loss of communications        4. Call Nucletron at the number
between the Treatment Unit, and the        listed on the Emergency
Control Unit.  The Treatment Unit,         Procedures sheet posted on the
which has control of the treatment         console.  DO NOT attempt to
parameters, continues to function          reset the system and continue
properly.                                  the treatment.

                                        You will be given instructions in
                                        the proper method of resetting
                                        the Control Unit and continuing
                                        with the treatment. There is no
                                        danger of overexposure to
                                        the patient or operator if the
                                        procedure is followed.

FOR MORE INFORMATION, CONTACT:                       Tel: 1- 800-445-9295
Nucletron-Oldelft Corporation                         Fax: (410)-312-4196
Columbia, Maryland, 21046                        Issue Date: Mar. 4, 1996
Page 1 of 1                                                  Part 300.074


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