ML20248M050

Special Rept 98-02:on 980502,Channel 3 of loose-part Detection Sys Was Declared to Be Inoperable.Caused by Failure of Component Inaccessible at Power.Addl Troubleshooting Will Be Performed

ML20248M050
Person / Time
Site:	Callaway
Issue date:	06/08/1998
From:	Affolter R UNION ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
98-02, 98-2, ULNRC-3843, NUDOCS 9806120295
Download: ML20248M050 (3)

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< June 8,1998 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Stop Pl-137 Washington, DC 20555-0001 ULNRC-3843 UE ac*""":

DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 FACILITY OPERATING LICENSE NPF-30 SPECIAL REPORT 98-02 LOOSE-PART DETECTION SYSTEM CIIANNEL INOPERA11LE FOR GREATER THAN 30 DAYS This special report is submitted in accordance with Final Safety Analysis Report 16.3.3.5 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 te Technical 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 ttatus."

R. D. Affolter Manager, Callaway Plant

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ULNRC-3843 June 8,1998 l Page 2 l cc: Mr. Ellis W, Merschoff-Regional Administrator U.S. Nuclear Regulatory Commission Region IV l

611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064 Senior Resident Inspector Callaway Resident Office

, U.S. Nuclear Regulatory Commission l- 8201 NRC Road h Steedman, MO 65077 Ms. Kristine Thomas (2 copies)

Licensing Project Manager, Callaway Plant Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop 13E16 Washington, DC 20555-2738 Manager, Electric Depanment Missouri Public Sersice Commission PO Box 360 -

Jefferson City, MO 65102 Mr. Thomas A. Baxter l, Shaw, Pittman, Potts, & Trowbridge 2300 N. Street N.W.

Washington, DC 20037 1

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ULNRC-3843 June 8,1998

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SPECIAL REPORT 98-02 l

LOOSE-PART DETECTION SYSTEM CIIANNEL )

INOPERABLE FOR GREATER TIIAN 30 DAYS I

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This report is submitted in accordance with Final Safety Analysis Report 16.3.33.5 Action a, which states:

"With one or more Loose-Pan Detection System channels inoperable for more than 30 days, prepare and submit a Special Report to the Commission pursuant to Technical 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 2000 CDT, on 5/2/98, Channel 3 of the Loose-Part Detection System was declared to be inoperable.

The plant was in Mode 2 at 0% power.

The Channel 3 accelerometer is located in containment mounted on the reactor vessel head assembly. The problem is loss of signal due to failure of a component inaccessible at power (charge converter sensor).

Additional troubleshooting will be performed during the next outage of suflicient duration. Channel 4, also on the reactor head assembly, remains operable as well as the remaining ten channels in the Loose-Part Detection System.

Until further troubleshooting is completed, actions to be taken to prevent recurrence can not be determined.

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