ML20082E247

Special Rept 91-01 Re Loose Part Detection Sys Channel Remaining Inoperable for Greater than 30 Days.Cause Under Investigation.Until Further Troubleshooting Completed, Corrective Actions Cannot Be Determined

ML20082E247
Person / Time
Site:	Callaway
Issue date:	07/25/1991
From:	Blosser J UNION ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
91-01, 91-1, ULNRC-2448, NUDOCS 9107310287
Download: ML20082E247 (3)

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-Union Etucruic a

Callaway Plant _

July 25,1991 U. P. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 ULNRC-2448 Gentlemen:

DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 FACILITY OPERATING LICENSE NPF-30 SPECIAL REPORT 91-01 LOOSE-PART DETECTION SYSTEM CHANNEL INOPERABLE FOR GREATER THAN 30 DAYd This Special Report is being submitted pursuant to Technical Specification 3.3.3.8 Action (a) concerning the inoperability of one channel of the Loose-Part Detection System.

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.,f] N;nu' h.D.Blosser Manager, Callaway Plant JDB/TPS/MAH/lrj cc: Distribution attached 9101h41d' 2 87 91072'-

hDR ADOCK 050coggg ,,

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/) ~/ l Marhng Address- P O. Box 62Q Futton, MO E5251 i*

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c,c distribution for ULNRC-2448

-Mr. A. Bert Davis Mr. M. David Lynch, J r. (2 copies)

Regional Administrator U.S. Nuclear Regulatory Commission U.S. Nuclear Regulatory Commission OWFN - Mail Stop 13E21 Region III Washington, D.C. 20555 799 Roosevelt Road Glen Ellyn, IL 60137 Manager, Electric Department Mr. O. Maynard Missouri Public Servico Commission Wolf Creek Nuclear Operating Corp.

P.O. Box 360 P. O. Box 411 Jefferson City, MO 65102 Burlington, KS 66839 Records Center Mr. Merlin Williams Institute of Nuclear Power Operations Supt. of Regulatory Quality Suite 1500 & Adminiscrative Se rvices 1100 circle 75 Parkway Wolf Creek Nuclear Operating Corp.

Atlanta, CA 30339 P. O. Box 411 Burlington, KS 66839 NRC Senior Resident Inspector Mr. R. L. Hague Chief, Project Section 3C U.S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137

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e i SPECIAL REPORT 91-01 i LOOSE-PART DETECTION SYSTEM CHANNEL INOPERABLE FOR CREATER THAN 30 DAYS l

This report is submitted.in accordance with Technical Specification 3.3.3.8  !

Action (a) which states, "With one or more Loose-Part Detection System  !

channel (s) 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 0800 CDT on 6/20/91, following a Main Control Board Loose-Part annunciator and performance of an inservice inspection by Instrument and Conti- technicians and Operations, Channel 3 of the Loose-Part Detection System was determined to be inoperable. The plant was in Mode 1 at 100%

power.

The Channel 3 accelerometer is located in the containment mounted on the l reactor _ ves;e1 head assembly. Initial troubleshootng of Channel 3 has determined that the problem lies with the sensor mounting or associated sensor cabling. Since the instrument sensor is connected to the reactor vessel head (thus inaccesc:ble during power operations) further troubleshooting will not tc performed until the next outage of sufficient

duration. The remaining eleven channels in this system remaic, operable.

1 Until further troubleshooting has been completed, actions to be taken to prevent recurrence cannot be determined.

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