ML20132H193

Special Rept 85-09:on 850823,Channel 1 of Loose Parts Monitoring Sys Indicated Cable Fault During Control Room Shift & Surveillance.Cause Not Determined During Investigation.Work Request Initiated

ML20132H193
Person / Time
Site:	Callaway
Issue date:	09/23/1985
From:	Miltenberger S UNION ELECTRIC CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
85-09, 85-9, ULNRC-1183, NUDOCS 8510020089
Download: ML20132H193 (4)

Text

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a UNION ELECTRIC COMPANY Colkway Plont i

September 23, 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-1183

Dear Mr. Keppler:

DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 FACILITY OPERATING LICENSE NPF-30 SPECIAL REPORT 85-09 LOOSE PARTS MONITORING SYSTEM The enclosed Special Report is submitted pursuant to Technical Specification 3.3.3.8 concerning the loss of one channel of the Loose Parts Monitoring System.

S. E. Miltenberger af Manager, Callaway Plant kh WRR/CAC/drs Enclosure .

cc: Distribution attached 8510020089 850923 s" ^ K W$ #gk 7

' t Mailing Address P.O. Box 620 Fulton,MO65251

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cc distribution for ULNRC-1183 Mr. Tom Alexion Office of Nuclear Reactor Regulation U. S.' Nuclear. Regulatory Commission Mail Stop P-316 7920 Norfolk Avenue Bethesda, MD 20014 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 Mr. Nicholas A.'Petrick Executive Director, SNUPPS 5 Choke Cherry Road Rockville, Maryland 20850 Mr. J. H. Smith Bechtel Power Corporation SNUPPS Project 15740 Shady Grove Road Gaithersburg, Maryland 20877-1454 NRC Resident Inspector D. F. Schnell J. F. McLaughlin .

J. E. Davis (Z40LER)

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)

J. M. Price C. D. Naslund R. A. McAleenan S. L. Auston (470)(NSRB)

Merlin Williams, Wolf Creek SEM Chrono 3456-0021.6 3456-0260 Z40ULNRC G56.37 N. Date

SPECIAL REPORT 85-09 LOOSE PARTS MONITORING SYSTEM CABLE FAULT 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."

At approximately 1812 CDT on 8/23/85 Channel 1 of the Loose Pa'rts Monitoring System indicated a cable fault during the Control Room Shift and Daily Log Readings and Channel Check Surveillance. The channel would not reset after receiving and indicating the test alarm signal.

The plant was in Mode 1 at 97% power.

The Channel 1 accelerometer is located on in-core instrumentation guide tube 44 at a distance of not more than 6 inches from the bottom of the reactor vessel. An additional accelerometer (Channel 2) is also located on the lower reactor vessel on guide tube 42. Channel 2 was verified operable upon discovery of the cable fault on Channel 1.

A Work Request was initiated to troubleshoot Channel 1.

Verification and investigation of the Channel I circuitry from the Control Board to the Bio-Shield did not indicate the cause for the malfunction. No further investigation inside the Bio-Shield has been done due to the radiation level.

Additional investigation inside the Bio-Shield will be conducted at the first outage of sufficient' duration. Channel 1 will be returned to operable status no later than restart following the first refueling, i

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