ML20198B273

Special Rept 85-011:on 850912,Channel 10 of Loose Part Detection Sys Declared Inoperable During Surveillance Procedure.Investigation Conducted to Discover Root Cause & Plans for Restoring Inoperable Channel to Svc

ML20198B273
Person / Time
Site:	Wolf Creek
Issue date:	10/22/1985
From:	Koester G KANSAS GAS & ELECTRIC CO.
To:	Martin R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
85-011, 85-11, KMLNRC-85-239, NUDOCS 8511060383
Download: ML20198B273 (2)

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xANSAS GAS AND ELECTRIC COMPANY TW ELECTRC COMPANY GLENN L ROESTER vsCE Es.ctnet . newcLaam October 22, 1985 Mr. R.D. Martin, Regional Administrator U.S. toclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 1000 OCT 2 8l985 Arlington, Texas 76011 KML?aC 85-239 f Re: Docket Ib. SIN 50-482

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Subj: Special Report 85-011

Dear Mr. Martin:

The enclosed Special Report is submitted pirsuant to Technical Specifications 6.9.2 and 3.3.3.9.

Yours very truly, N

Glenn L. Koester Vice President - !bclear GIK:hkc Attachment xc: PO'Connor (2), w/a JCumins, w/a

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'Y?f 201 N. Market - Wictuta, Kansas - Mail Address: PO. Box 208 l Wictuta, Kansas 67201 - Telephone: Area Code (316) 2616451 b

J Attachment to KMIRRC 85-239 SPECIAL REPORP 85-011 IDOSE-PARP DETFPHON SYSITM INOPERABIE CHM @EL This report is being submitted pursuant to Technical Specification 6.9.2 and Technical Specification 3.3.3.9, Action Statement a, concerning a Loose-Part Detection System Channel which has been inoperable for more than thirty days.

On Septenber 12, 1985, at approximately 1625 07f, Channel 10 of the Icose-Part Detection System was declared inoperable. This failure was identified during the performance of surveillance procedure STS-IC-830, " Vibration and Icose Parts Monitor Analog Channel Operational Test", and was indicated by the absence of background noise when Channel 10 was selected on.the Audio Monitor. '!he Channel 10 accelerometer is located on the lower support flange of Steam Generator "C".

During troubleshooting efforts, technicians verified that no cable ground fault existed. A conparison of ohnuneter readings in the terminal box just upstream of the Channel 10 acceleroneter with the readings of the Channel 9 accelerometer, which is 120 degrees away from Channel 10 on the same supporting flange, found no significant differences. The technicians also attenpted to inspect the accelerometer enclosure, but due to the plant being at normal operating tenperature, were unable to perform an inspection beyond the insulation on the accelerometer.

Further investigation is being conducted concerning the discovery, i root cause, and plans for restoring the inoperable channel to service. The results of this investigation will be provided in a l supplecent to this report.

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