ML20086H143

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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 Duke Energy icon.png
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)


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Duke Tower Compny D L Raw Catawba Nuclear Generation Department

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

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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

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