ML20244C673

Special Rept:On 890225,operations Personnel Discovered That Channel 8 of Vibration & Loose Parts Monitoring Sys Had Low Noise Level.Investigation Scheduled to Be Completed During Unit 1 Tube Leak Outage

ML20244C673
Person / Time
Site:	McGuire
Issue date:	04/06/1989
From:	Tucker H DUKE POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 8904200334
Download: ML20244C673 (2)

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Dukelbuer Companyl (704) 875-4000 ,

McGuire NuclearStation PO Box 488 0 . Cornelius, NC 28031-0488 l:  ! DUKEPOWER

April' 6, ~ 1989

-U.S. Nuclear Regulatory Commission-

Document Control Desk

Washington, D.C. .'20555--

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Subject:

McGuire Nuclear Station Unit 1 Docket'No. 50-369 <

Technical Specification.3.3.3.10 and 6.9.2 Special Report-Gentlemen:

Please find attached a'special report submitted pursuant- to Technical Specification (T.S.) 6.9.2?as specified by T.S. 3.3.3.10. 'The report concerns operability of the Unit 1 Vibration and Loose Parts Monitor.

Should.there be any questions concerning this matter, please contact Robert Sharpe of Duke Power _at McGuire Nuclear Station at-(704) 875-4447.

Very truly yours, A*6 gjg,-

.Hal B. Tucker lEK/bcb

~ Attachment, xc: Mr. S.D. Ebneter American Nuclear Insurers i Administrator, Region II~ c/o Dottie Sherman, ANI Library -!

U.S. Nuclear Regulatory Commission The Exchange, Suit 245 101 Marietta St., NW,' Suite 2900 270 Farmington Avenue Atlanta, GA' 30323 Farmington, CT 06032

-INPO Records Center Mr. Darl Hood Suite 1500 U.S. Nuclear Reculatory Commission 1100 Circle 75 Parkway Office of Nuclear Reactor Regulation Atlanta, GA' 30339 Washington, D.C. 20555 M&M Nuclear Consultants Mr. P.K. Van Doorn l 1221 Avenue of the Americas NRC Resident Inspector j New York, NY 10020 McGuire Nuclear Station j mwm% S.

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l I Duke Power Company McGuire Nuclear Station Special Report l

l Operability of the Vibration and Loose Parts Monitor )

On February 25, 1989 Operations personnel discovered that channel 8 of the l Vibration and Loose Parts Monitoring System (VLPM) had a low noise level. A J work request was written to investigate and repair the channel; however, it has '

not been possible to determine the actual cause of the failure due to the numbers of possible failures (e.g. bad cable, failed accelerometer, failed pre-amp, etc.) and due to the location of the components within the plant (all components are currently inaccessible due to the work associated with a tube leak on 'D' steam generator). The investigation and repair of the VLPM are scheduled to be completed during the current Unit 1 tube leak outage. Noise levels in this channel are lower (quieter) than normal and lower than surrounding channels. If a loose parts condition did exist, a change in the noise level of this channel would be observed.

The VLPM is manufactured by Rockwell International and has had a history of not providing reliable service. Duke Design Engineering has conducted an investigation of the system which identified several design flaws and is presently pursuing a replacement for the existing VLPM. The modification has been scheduled to be implemented for Unit 1 in 1991.

This item is not reportable to the Nuclear Plant Reliability Data System.

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