ULNRC-02922, Special Rept 93-04:on 931119,channel 7 of loose-part Detection Sys Determined Inoperable for Greater than 30 Days.Charge Converter Replaced.Troubleshooting Revealed Problem W/Sensor Mounting or Associated Sensor Cabling

Special Rept 93-04:on 931119,channel 7 of loose-part Detection Sys Determined Inoperable for Greater than 30 Days.Charge Converter Replaced.Troubleshooting Revealed Problem W/Sensor Mounting or Associated Sensor Cabling

ML20059A424
Person / Time
Site:	Callaway
Issue date:	12/20/1993
From:	Blosser J UNION ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
93-04, 93-4, ULNRC-02922, ULNRC-2922, NUDOCS 9312300167
Download: ML20059A424 (3)

Text

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d' Callaway Piant

- Post offte Box 620

, fliton, Missaan 65251  ;

t Union Etscr1UC December 20,' 1993

$ a U. S. Nuclear Regulatory Commission l Document Control Desk Washington, D.C. 20555 P

ULNRC-02922

~i Gentlemen: ,

DOCKET NUMBER 50-483  ;

CALLAWAY PLANT UNIT 1 FACILITY OPERATING LICENSE NPF-30 a SPECIAZ REPORT 93-04  ;

LOOSE-PART DETECTION SYSTEM CIIANNEL i INOPERAHLE FOR GREATER TIIAN 30 DAYS t 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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. D. Blosser JDB/SES/MAH/Irj l Enclosure .  :

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cc distribution for ULNRC-02922 Mr. J. B. Martin Regional Administrator-U. S. Nuclear Regulatory Commission ,

Region 111 801 Warrenville Road Lisle, Illinois 60532-4351 ,

Mr. L. Raynard Wharton (2 copies)

U. S. Nuclear Regulatory Commission OWFN - Mail Stop 13E21 Washington, D. C. 20555 Manager, Electric Department -

Missouri Public Service Commission P. O. Box 360 Jefferson City, MO 65102 Records Center ,

Institute of Nuc! car Power Operations 700 Galleria Parkway Atlanta, GA 30339 s

Mr. Art Mah ,

Wolf Creek Nuclear Operating Corporation P. O. Box 411 Burlington, KS 66839 -

Mr. Tom M, Tongue Acting Chief, Project Section 3A U. S. Nuclear Regulatory Commission [

Region III 801 Warrenville Road Lisle, Illinois 60532-4351 NRC Senior Resident Inspector e

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, SPECIAL REPORT 93-04 LOOSE-PART DETECTION SYSTEM CllANNEL INOPERAHl.E FOR GREATER TIIAN 30 DAYS 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 10:00 CST on 11/19/93, Channel'7 of the Loose-Part Detection System was determined to be inoperable. The problem was originally thought to be in the charge converter located inside containment outside the bioshield. The plant was in Mode 3, Ilot Standby. The charge converter was replaced, but it did not eliminate the problem.

By that time, criticality had been achieved.

The Channel 7 accelerometer is located in the containment mounted on the tubesheet.

flange of Steam Generator "B". Further troubleshooting of Channel 7 has determined that the problem lies with the sensor mounting or associated sensor cabling. Since the instrument sensor is connected to a steam generator (thus inaccessible during power operations), further troubleshooting will not be performed until the next outage of sufficient duration. The remaining eleven channels in this system remain operable.

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

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