ML20101T730

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Special Rept:On 841231,Tech Spec 3.3.3.4 Violated.Caused by Failure to Restore Malfunctioned Meteorological Monitoring Sys within Required 7-day Period.Circuit Card Connections Checked Out.Sys Returned to Svc on 850110
ML20101T730
Person / Time
Site: Catawba Duke Energy icon.png
Issue date: 01/17/1985
From: Tucker H
DUKE POWER CO.
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NUDOCS 8502060324
Download: ML20101T730 (2)


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DUKE POWER GOMPANY P.O. Box 33180 CHARLOTTE, N.O. 28242 HALB. TUCKER res.zenoxx

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wha. PRESEDE.7 f217 p lf985 Mr. James P. O'Reilly, Regional. Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Re: Catawba Nuclear Station, Unit 1 Docket No. 50-413

Dear Mr. O'Reilly:

Pursuant to Technical Specification 3.3.3.4, Action Statement a., please find attached a Special Report concerning the inoperability of the Meter-logical Monitoring Instrumentation System.

Very truly yours, b.

ffh Fa1 B. Tucker RWO: sib Attachment cc: Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 i

NRC Resident Inspector Catawba Nuclear Station Palmetto Alliance 213513 Devine Street Columbia, South Carolina 29205 Mr. Jesse L. Riley Carolina Environmental Study Group 854 Henley Place Charlotte, North Carolina 28207 Robert Guild, Esq.

P. O. Box 12097 Charleston, South Carolina 29412 85,0 o

OFFIGAE COP.Y.

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e Duke _ Power Company Catawba Nuclear Station Inoperability of Meteorological Mo'nitoring Instrumentation System On December 31, 1984, during performance of routine. surveillance procedures, a malfunction of the Meteorological Monitoring Instrumentation System was discovered. _ Failure to restore the system to operable status within the

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required period of seven (7) days resulted in Laplementing Action Statement

a. of Technical Specification 3.3.3.4.

At approximately 0400 hours0.00463 days <br />0.111 hours <br />6.613757e-4 weeks <br />1.522e-4 months <br /> on December 31, 1984, Personnel discovered the malfunction and initiated Work Request #13635 OPS for investigation and repair of the system.

System inoperability occurred when an internally generated error signal caused the Automet V Computer's CPU unit to halt processing. The CPU was reset per the manufacturers' instruction manual and returned to normal operation but the system remained out of service pending completion of.the channel calibration. This error condition continued to occur periodically, each tbne requiring manual reset to clear, and thus prevented the systems' return to operability within the. required seven (7) day period.

The manufacturer has indicated that the problem may be the. result of improper circuit card connections. The circuit card connections were checked out and the unit was returned to service on January 10, 1985.

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