ML20027E665
| ML20027E665 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 11/05/1982 |
| From: | Koester G KANSAS GAS & ELECTRIC CO. |
| To: | Seidle W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, KMLNRC-82-251, NUDOCS 8211150589 | |
| Download: ML20027E665 (4) | |
Text
KANSAS GAS AND ELECTRIC COMPANY THE ELECT AiC COMPANY GLENN L MOESTER v<E PRESaDENT NUCLE AR November 5, 1982 Mr. W.C. Seidle, Chief g'
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611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 b
--d KMLNRC 82-251 Re:
Docket No. STN 50-482 Subj : Final 10CFR50.55(e) Report - Suspect Potentiometer Leads on Foxboro Cards
Dear Mr. Seidle:
This letter provides the final report concerning suspect potentiometer leads on Foxboro cards. Kansas Gas and Electric Company initially reported this matter to Region IV of the Nuclear Regulatory Commission (NRC) on October 8, 1982.
Ad-ditional information was provided to Mr. Johnson, NRC Region IV, on October 12, 1982.
The attached Final Report is submitted pursuant to Regulation 10CFR50.55(e). If you have any questions concerning this subject, please contact me or Mr. Otto Maynard of my staff.
Yours very truly, GLK:bb Attach cc: Messrs. TVandel/SSchum, w/a
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8211 ISO 599 821105 hDRADOCK 05000482 I
l PDR 201 N. Market - VcMa, Kansas - Mail Address: PO. Box 208 I WicMa. Kansas 67201 - Telephone: Area Code (316) 261-6451 N
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1, 10CFR50.55(e) FINAL REPORT On SUSPECT POTENTIOMETER LEADS For i
WOLF CREEK GENERATING STATION, UNIT NO.1 I
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November 5, 1982 i
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I.
INTRODUCTION he Foxboro Company recently advised Kansas Gas and Electric Company that a potential deficiency may exist in certain cards or modules supplied to Wolf Creek Generating Station (WCGS). he suspect component is a cne K ohm potentiometer utilized to set the alarm point or gap for alarms. he advisory described in detail the method of ferreting out the suspect parts.
Instrumentation and Control personnel at Wolf Creek Generating Station commenced a thorough investigation to determine whether or not any of the suspect units had been supplied to WCGS.
%e investigation involved the removal of all cards of the suspect types, one at a time, from all plant Foxboro racks and checking for the suspect potentiometers.
Cards in warehouse spare parts were also checked.
he inve stigation revealed that 11 out of 158 cards contained the suspect potentiometer. Scne of the suspect cards were installed in safety-related equipment.
II.
DESCRIPTION OF DEFICIENCY Foxboro's advisory stated that f actory tests and evaluation revealed that components utilized during the period December, 1980, to December, 1981, may have been subjected to mechanical stress during assembly.
his stress could have, in some cases, created a fracture of the leads to resistive element connection. his condition could, with subsequent stress due to temperatire variations, vibration or additional mechanical stress due to setting adjustments; cause an intermittent open or short to occur.
III. ANALYSIS OF SAFETY IMPLICATIONS Due to the nature of the potential defect it would be dif ficult to find the actual faults, if any, and it may take several years of operation before any adverse performance would be observed.
Se cards are used in
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several applications including safety-related equipment.
Herefore, rather than performing a safety analysis, the conservative assumption was made that all suspect potentiometers were f aulty and could have adversely affected the safety of operations of the plant.
Werefore, this matter is reportable under Regulation 10CFR50.55(e).
IV. CORRECTIVE ACTION he eleven cards with the potentially defective potentiometers will be returned to the Foxboro Company for repair or replacement.
It is anticipated that @ proximately three months will be required to complete the corrective ac tion.
In any event the corrective action will be completed prior to fuel load.
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