ML20129D324

Special Rept 85-04:on 850504,during Control Room Shift & Daily Log Readings & Channel Check Surveillance,Channel 9 of Loose Parts Monitoring Sys Logged in Alarm Status.Caused by Component Malfunction.Addl Investigation Will Be Conducted

ML20129D324
Person / Time
Site:	Callaway
Issue date:	06/13/1985
From:	Miltenberger S UNION ELECTRIC CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
85-04, 85-4, ULNRC-1111, NUDOCS 8507160493
Download: ML20129D324 (4)

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UNION ELEcTsic COMPANY

' CALLAWAY PLANT MAILING ADDftEss:

P.O. BOX Sao FULTON. MO. S5288 June 13, 1985 Mr. James.G. Keppler Regional Administrator Office'of_ Inspection & Enforcement U.S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 ULNRC-1111

Dear Mr. Keppler:

DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 FACILITY OPERATING LICENSE NPF-30 SPECIAL REPORT 85-04 LOOSE PARTS MONITORING SYSTEM The enclosed Special Report is submitted pursuant to Technical Specifications 3.3.3.8 concerning the loss of one channel of the Loose Parts Monitoring System, b

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S. E. Miltenberger Manager, Callaway Plant WRR/WRB/dra Enclosure cc: Distribution attached

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0507160493 050613 PDR ADOCK 05000483 8 PDR ,

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cc distribution for ULNRC-llll American Nuclear Insurers c/o Dottie Sherman, Library The Exchange Suite 245 270 Farmington Avenue Farmington, CT 06032 Records Center Institute of Nuclear Power Operations Suite 1500 1100 Circle 75 Parkway Atlanta, GA 30339 NRC Resident Inspector D. F. Schnell J. F. McLaughlin J. E. Davis (Z40SR)

D. W. Capone /R. P. Wendling F. D. Field R. L. Powers A. C. Passwater/D. E. Shafer/D. J. Walker G. A. Hughes W. R. Robinson (QA Record)

C. D. Naslund M. E. Taylor J. M. Price R. A. McAleenan L. K. Robertson (470)(NSRB)

Merlin Williams, Wolf Creek SEM Chrono 3456-0021.6 .

3456-0260 Z40ULNRC G56.37 N. Date l

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SPECIAL REPORT 85-04 LOOSE PARTS MONITORING SYSTEM ALARM This report is being generated in accordance with Technical Specification 3.3.3.8 action (a.) which states "with one or more Loose-Part Detection System channels inoperable for more than 30 days, prepare and submit a Special Report to the Commission pursuant to Specification 6.9.2 within the next 10 days outlining the cause of the malfunction and the plans for restoring the channel (s) to OPERABLE status."

On 5/4/85 at approximately 1200 CDT, during the Control Room Shift and Daily Log Readings and Channel Check Surveillance, Channel 9 of the Loose Parts Monitoring System was logged in the alarm status. The plant was in Mode 1 at 75% power.

The Channel 9 accelerometer is located on Steam Generator C near inlet A on the lower supporting flange. An additional accelerometer (Channel 10) is also located on Steam Generator C on the lower supporting flange approximately 120' clockwise from Channel 9 (see attached sketch). Upon discovery of Channel 9 in an alarm state, Channel 10 was verified to be reading normal. Investigation revealed that Channel 9 had failed and was thereby giving a false reading.

A Work Request was initiated to troubleshoot Channel 9.

Technicians verified circuitry from the Control Board to the Bio-shield and found no indication of a cause of the malfunction. Due to the radiation level inside the Bio-shield, no further investigation has been done.

At the first outage of sufficient duration, additional investigation inside the Bio-shield will be conducted. Channel 9 will be returned to an operable state no later than the restart following the first refueling, i

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