ML20150C674

Special Rept:On 880217,discovered That Channel 5 of Vibration & Loose Parts Monitor (Vlpm) Had Low Noise Level. Cause Not Determined.Util Presently Pursuing Replacement of Existing Vlpm & Appropriate Schedule for Installation

ML20150C674
Person / Time
Site:	Mcguire
Issue date:	03/11/1988
From:	Tucker H DUKE POWER CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
NUDOCS 8803210164
Download: ML20150C674 (2)

Text

?Y DUKE POWER GOMPANY P.O. DOX 33100 C11ARLOTTE, N.O. 28242 HAL11. TUCKER TE LEPHONE vtsram. wen (704) 073-4501 NtTLEAR PROOCCTION 1

March 11, 1988 U.S. Nuclear Regulatory Commission

' Document Control Desk Washingtan, D.C. 20555

Subject:

McGuire Nuclear Station, Unit 2 Docket No. 50-370 Technical Specification 3.3.3.10 and 6.9.2 Special Report Gentlemen:

Please find attached a special report submitted pursuant to Technical Specifica-tion (T.S.) 6.9.2 as specified by T.S. 3.3.3.10. The report concerns operability of the Unit 2 Vibration and Loose Parts Monitor.

Should there by any questions concerning this matter, please contact us through the norme,1 licensing channels.

sVery truly yours,

./ -

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/

Hal B. Tucker JBD/250/j gc Attachment xc: Dr. J. Nelson Grace Mr. Darl Hood Regional Administrator, Region II U.S. Nuclear Regulatory Commission U.S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation 101 Marietta St., NW, Suite 2900 Washington, D.C. 20555 Atlanta, GA 30323 INPO Rectrds Center Mr. W.T. Orders Suite 1500 NRC Resident Inspe c tor 1100 Circle 75 Parkway McGuire Nuclear Station Atlanta, GA 30339 flk

/ t I 8803210164 880311 PDR ADOCK 05000370 S DCD

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i; DUKE POWER COMPANY McGUIRE NUCLEAR STATION SPECIAL REPORT OPERABILITY OF THE VIBRATION AND LOOSE PARTS MONITOR On February 17, 1988 Operations personnel discovered that Channel 5 of the Vibration and Loose Parts Monitor (VLPM) had a low noise level. A work re-quest was written to repair the system; 'however, it was not possible to de-

, termine the actual cause of the failure due to the number of possible fail-ures, (e . g . bad cable, failed accelerometer. . f ailed pre-amp) and due to the location of the components within the plant,, (all components are located in the Containment Building) . The VLPM will be repaired during the next Refuel-ing Outage or during an extended forced outage should one occur. Present noise levels are lower (quieter) than normal and lower than surrounding chan-

.nels; therefore, Duke believes that there is no loose parts condition at Mc-Guire. If a loose parts' condition did exist, higher noise levels in these channels would be observed.

The VLPM is manufactured by Rockwell International and has a history of not providing reliable se rvic e. Duke Design Engineering has conducted an inves-tigation of the system and has identified several design flaws. Duke is pres-ently pursuing a replacement for the existing VLPM and an appropriate schedule for installation.

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