United States Nuclear Regulatory Commission - Protecting People and the Environment


ACCESSION #: 9810080096


Westronics [Registered Trademark]
A subsidiary of Thermo Instrument System, Inc.

THIS IS A 10CFR PART 21 NOTIFICATION FOLLOW-UP REPORT

Contacts: Robert T. Agee
Quality Assurance Manager
Larry Zett
Service Manager
September 28, 1998
US Nuclear Regulatory Commission
Document Control Desk
Washington, DC 20555
 
Subject: Westronics Model 1200AC and 1200BC Recorders
 
Reference: Facsimile Message, Westronics to USNRC dated August 5, 1998, same subject

This letter is a follow-up to the reference letter, a notification of a defect associated with Westronics 1200AC and 1200BC recorders built under the Westronics 10CFR50 Appendix B Program.

On July 23, 1998, Westronics determined that three Westronics Series 1200A Commercial Grade recorders had exhibited an anomaly whereby the alpha-numeric and/or bar-graph displays went blank or froze, potentially presenting erroneous information to the operator.

The Westronics Series 1200A and 1200B recorders are 1/2 Din, programmable recorders which contain door mounted alphanumeric and bar-graph displays.

This anomaly is associated with repetitive openings and closures of the recorder door, which could cause strain related fractures in the flat-conductor cable routed to the door-mounted displays.

After the failure, the recorder continues to measure and process data correctly, and to alarm on process signals that have exceeded normal boundaries. The recorder pens also indicate signal levels correctly, however, the data which is measured and recorded may not match the data which is displayed on the alphanumeric and bar-graph displays.

There have been no reported field failures of safety related Series 1200 (1200AC or 1200BC) recorders. Although the anomaly has been identified in Commercial Grade recorders only, Westronics has sent this notification to all customers who have purchased 1200AC and/or 1200BC recorders. The scope of the notification included fourteen (14) safety related recorders, of which thirteen (13) are Westronics Series 1200AC and one (1) is a Westronics Series 1200BC.

Thermo Electron

Westronics Inc. o 22001 North Park Drive, Suite 100 o Kingwood, TX 77339-3804
Phone: 281/348-1800 o Fax: 281/348-1288
E-mail: westron@westronics.com o http://www.westronics.com [EXIT]


The following is the list of safety related recorders which could potentially contain the defect, including Serial Number, Westronics Ship Date, Customer, Location Shipped To, and Purchase Order.
Recorder Serial # Ship Date Customer Shipped To Purchase Order
123AC1019 07/10/98 Duquesne Light Beaver Valley D162900
123AC1020 07/10/98 Duquesne Light Beaver Valley D162900
123AC1021 07/10/98 Duquesne Light Beaver Valley D162900
123AC1022 07/10/98 Duquesne Light Beaver Valley D162900
123AC1023 07/10/98 Duquesne Light Beaver Valley D162900
123AC1024 07/10/98 Duquesne Light Beaver Valley D162900
121BC7042 07/01/98 Entergy Riverbend Sta. RB972301
121AC1025 07/07/98 Entergy Ark. Nuclear One 973287
121AC1026 07/07/98 Entergy Ark. Nuclear One 973287
121AC1027 07/07/98 Entergy Ark. Nuclear One 973287
122AC1028 07/07/98 Entergy Riverbend Sta. RB980091
122AC1029 07/07/98 Entergy Riverbend Sta. RB980091
123AC1030 07/07/98 Entergy Riverbend Sta. RB980091
123AC1031 07/07/98 Entergy Riverbend Sta. RB980091

A design modification was developed which provides a larger bend radius, and re-routes the flat-conductor cable, thereby greatly improving reliability of the part.

Westronics has notified the above listed customers and is currently making arrangements to implement the design modifications, either by rework at the Westronics facility, or by rework at the customer location, by Westronics Service Technicians. It is estimated that rework associated with the design modifications will be complete within sixty (60) days, or as soon as Westronics is contacted by the identified customers.

Should you have any questions regarding the above, please contact the undersigned.

Sincerely,

Robert T. Agee
Quality Assurance Manager


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