ML20086H143

Special Rept:On 950608,Channel 13 Was Declared Inoperable. Trending of Bias Voltage & Background Rms Evaluated to Conclude Channel Was Experiencing Periodic Failures. Corrective Maint Will Be Performed During 1EOC9 Outage

ML20086H143
Person / Time
Site:	Catawba
Issue date:	07/11/1995
From:	Rehn D DUKE POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9507180046
Download: ML20086H143 (1)

Text

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Catawba Nuclear Generation Department %ce hesident j 4800ConcordRoad ., (803)8313205Oflice f

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( July 11,1995 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 l i

Subject:

Catawba Nuclear Station, Unit 1  ;

Docket No. 50-413 Special Report  :

Vibration and Loose Parts Monitoring System l On June 8,1995, Channel 13 (S/G 1B Manway) was declared inoperable.  !

Trending of bias voltage and background RMS was evaluated to conclude  ;

that the channel was experiencing periodic failures. Problem Investigation i Process (PIP) 1-C95-0883 has been initiated for tracking purposes; work '

request 95025569 (WO 95045842-01) has been initiated to perform corrective  !

maintenance on this instrumentation. This work will be performed during  ;

1EOC9 outage. Redundant monitoring is afforded by Channels 12 (S/G 1B l Secondary) and 14 (S/G 1B Hot Leg).  !

i Since this channel has been inoperable for 30 days; it is reportable pursuant to Technical Specification 3.3.3.9. i Very truly yours, A _ - __ -

D. L. Rehn KEN /SR071195. LPM i Attachment xc: S. D. Ebneter, Regional Administrator R. E. . Martin, ONRR R. J. Freudenberger, SRI 9507180046 950711 PDR ADDCK 05000413

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