Part 21 Report - 1995-036
ACCESSION #: 9502020175 Westronics A subsidiary of Thermo Instrument Systems Inc. THIS IS A 10 CFR PART 21 NOTIFICATION January 30, 1995 Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555 Subject: Spare parts supplied for Westronics chart recorder models S4N, D4N, T4N and 2100C. Westronics has discovered that the possibility exists that some nonconforming diodes may have ben used in safety related spare parts provided for the above noted instruments. The offering parts are generic 6.3 V zener reference diodes 1N825 (Westronics part number SE01N825-00). These particular diodes are easily identified as they are flat black in color with a gray band. These diodes were mixed in with other diodes received from an electronics component distributor. An internal purge was performed in August of 1994 in our commercial production when the nonconforming diodes were discovered. All existing stock was purged because good and bad diodes were mixed together in stock. Westronics felt at the time that all of the bad components had been accounted for. However, service activity performed for GPU Nuclear Oyster Creek in January, 1995 on some commercial recorders (D4E3) revealed that some nonconforming diodes had been dedicated from our commercial stock and supplied in safety related spare parts. The 1N825 diode is used to generate reference voltages in the signal conditioning circuits of the noted instruments. The nonconforming diodes are "noisy" and cause a drift in calibration of the host instrument. The diodes are found on the CB100124N02 and CB100124N04 signal input boards for the S4N, D4N and T4N series and the CB100243C01 ADC board for the 2100C series. Westronics has been able to precisely determine which customers may have received spare parts with the bad diodes. A list of affected license holders and other recipients ia attached for your reference. All customers on the list have received a similar notification. Customers may obtain replacements or return boards for repair by contracting Westronics Recorder Service department at 1-800-433-2184. For further information, please contact the undersigned at (713) 348-1780 Sincerely, Westronics Inc. Chris Kelly Quality Assurance Manager /Attachment P.O. Box 4500 o 22001 North Park Drive o Humble, Texas 77347-4500 Phone: 713/348-1800 o Fax: 713/348-1288 List of Affected Customers: Customer Part Number Lot Number Qty Entergy Operations - River Bend Station CB100124N04 0037510 1 Florida Power - Turkey Point Plant CB100124N04 0037510 1 CB100124N04 0049330 1 CB100243C01 0036510 2 Supplied as KT100161C03 kit New York Power - J.K. Fitzpatrick Plant CB100124N04 0049330 1 Taiwan Power Company CB100124N04 0037510 3 Victoreen Inc. CB100124N02 0048910 15 *** END OF DOCUMENT ***
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