ML20202C470

Ro:On 971228:Unit 1 Loose Parts Monitoring Sys Channel 6 Was Declared Inoperable Due to Excessive Static on Channel. Caused by Loose Connection.Work Order Has Been Written to Pursue Repairs

ML20202C470
Person / Time
Site:	Catawba
Issue date:	02/05/1998
From:	Gordon Peterson DUKE POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9802120255
Download: ML20202C470 (2)

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• Gary R. M, son (803) 831-4251 cunct W , b nib ne (803) 8313426 w February-5, 1998 U. S. Nuclear Regulatory Commission ATTEN, TION: Document Control Desk Washington, DC 20555-0001

SUBJECT:

Duke Energy Corporation Catawba Nuclear Station Unit 1 Docket No. 50-413 Special Report Loose Parts Monitoring System Pursuant to Selected Licensee Commitment 16.7-4 and Technical Specification 6.9.2, this special report is being submitted due to one channel of the Unit 1 Loose Parts Monitoring System being inoperable for greater than 30 days.

On' December 28, 1997, Unit 1 Loose Parts Monitoring System Channel 6 (Upper Reactor Vessel 240 degrees) was declared inoperable due to excessive static on the channel. This was discovered during Baseline Impact Testing during startup from the End of Cycle 10 refueling outage. The static, believed to be attributable to a loose connection at the accelerometer, was severe enough for the channel to be declared inoperable. A Work order has been written to

(. pursue repairs. It was not possible to access this Channel's accelerometer to perform corrective action prior to Unit 1 Cycle 11 Startup. Repairs to this channel will be performed no.later than the upcoming Unit i refueling outage in 1999.

Channel 4 (Upper Reactor Vessel-0 degrees) and Channel 5 (Upper Reactor Vessel 120 degrees) are operable and afford sufficient coverage of the upper reactor vessel data collection region.

Questions on this Special Report should be directed to M.H.

Chernoff at (803) 831-3414.

Ver tr y o s, O

G. R. Peterson V 10 .

9902120255 990205 PDR ADOCK 05000413:-

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. 0.'S. Nuclear Regulatory _ Commission +

February 5, 1998 )

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L. A. Reyes .

U. S. Nuclear Regulatory Commission i Regional Administrator, Region II Atlanta Federal Center-

. 61 Forsyth St., SW,-Suite 23785 Atlanta,'GA 30303 P. S. Tam NRC Senior Project Manager (CNS)

U. S. Nuclear Regulatory Commission Mail Stop O-14H25 t Washington, DC- 20555-0001 D. J. Roberts-Senior Resident Inspector (CNS) I U. S. Nuclear Regulatory Commission ,

Catawba Nuclear Site t

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