ML20206P239

Special Rept:On 981222,operators Removed non-TS Channel 12 Drywell Pressure Recorder & Associated TS Pressure Indicator from Svc.Caused by Intermittent Measuring Cable Connection in non-TS Recorder Circuitry.Replaced Cable

ML20206P239
Person / Time
Site:	Nine Mile Point
Issue date:	12/31/1998
From:	Abbott R NIAGARA MOHAWK POWER CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NMP1L-1398, NUDOCS 9901110039
Download: ML20206P239 (2)

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NiagarahMohawk' I

Richard B. Abboh Phone: 315.349.1812 i Vice President Fax: 315.349.4417 !

NucharEngineering l l

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1 December 31,1998 NMPIL 1398 i

U. S. Nuclear Regulatory Commission Attn: Document Control Desk

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Washington, DC 20555 RE: Nine Mile Point Unit 1 l Docket No. 50-220 l

DPR-63 ,

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Subject:

Special Report Gentlemen: )

In accordance with Nine Mile Point Unit 1 (NMP1) Technical Specification (TS) Table 3.6.11-2, " Accident Monitoring Instrumentation," Action Statement 4.a, Niagara Mohawk Power Corporation (NMPC) is submitting the following Special Report concerning the inoperability of the Channel 12 Drywell Pressure Monitor. /

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Descriotion of Event On December 22,1998, at approximately 1223 hours0.0142 days <br />0.34 hours <br />0.00202 weeks <br />4.653515e-4 months <br />, with the reactor mode switch in the k "RUN" position during normal operations, operators removed the non-TS Channel 12 Drywell Pressure Recorder and the associated TS Pressure Indicator from service to correct intermittent signal wire connections internal to the recorder.

rance of Event The cause of the event was an intermittent measuring cable connection in the non-TS recorder circuitry due to normal wear.

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9901110039 981231 9 PDR ADOCK 05000220' S ppR L Nine Mile Point Nuclear Station R0. Box 63, Lycoming. New York 13093 0063

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cometin Arrinns j l Under Work Order 98-07079-00, Instrument and Controls (I&C) technicians replaced the

! measuring cable in the pressure recorder circuitry that had caused the intermittent connection.

I&C technicians then satisfactorily tested the non-TS Channel 12 Drywell Pressure Recorder l and the associated TS Pressure Indicator. Operators declared the equipment operable on l Decem'r- 24,1998, and returned the instruments to service.

i Very truly yours, j

! I fd6h& W Richard B. Abbott Vice President Nuclear Engineering RBA/KLUkap xc: Mr. H. J. Miller, Regional Administrator, Region I Mr. G. K. Hunegs, Senior Resident Inspector Records Management i

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