ML20043B171

Special Rept:On 900418,diesel Generator 2B Failure Occurred During Operability Test & Output Breaker Tripped on Reverse Power.Caused by Operator Error.Reverse Power Relays Checked & Found to Be Operating Correctly.Operator Counseled

ML20043B171
Person / Time
Site:	Catawba
Issue date:	05/17/1990
From:	Owen T DUKE POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9005240315
Download: ML20043B171 (2)

Text

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, ' Duke i%r Cony >any 00 AIOOOO -

n - Ceauha Nuclear $tation _

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DUKEPOWER s

sMay I7',c1990 Document Control ~ Desk U. S. : Nuclear, Regulatory Commission >

Y Washington, D. C.. 20555

Subject:

Catawba Nuclear Station Docket 50-414 ';,

.Special Report - Unit 2 s Invalid Failure 2B D/G.

. Gentlemen:.

Pursuant toTTechnical Specification 6.9.2 and 4.8.1.1.3, please-find attached a-

-t Special Report concerning Unit 2B Diesel Generator Invalid Failure on April .18,.

.1990.

, .s f Very truly.yours, t

.' [

Tony'B. Owen.

. Station Manager kon: REPORT.SP:

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Mr. S. D. Ebneter American Nuclear Insurers Regional Administrator, Region II. c/o Dottie Sherman, ANI Library W The Exchange, Suite 245

-U. S.: Nuclear' Regulator Commission

' 101 Marietta Streeti NW, Suite 2900 270 Farmington Avenue Atlanta, GA 30323 Farmington,'CT 06032 M-& M Nuclear Consultants Mr. K. Jabbour 1221 Avenues of the Americas U. S. Nuclear Regulatory Commission New York, NY 10020 Office of Nuclear Reactor Regulation Washington, D. C. 20555 l I INPO Records Center I

< suite 1500 Mr. W. T. Orders

-1100. Circle 75 Parkway' NRC Resident Inspector Atlanta, GA 30339 Catawba Nuclear Station r

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SPECIAL REPORT During performance of the' Unit 2 Diesel-Generator B '

< ' Operability Test, the output breaker. tripped on reverse-power while attempting to synchronize the Diesel Generator with the 4160 Volt Essential. Power bus. The root cause of

.the. trip was. operator error. The operator failed to adjust the output voltage high enough above the line voltage to prevent actuation of the reverse power relay. This start attempt was classified.as.an invalid failure per NRC Regulatory Guide 1.108. It should be noted that the trip on reverse power is bypassed in the emergency mode.of operation.

Line voltage and Diesel Generator output. voltage meters as-

-well asEthe reverse power relay were checked and found to be-operating _ correctly. The operator involved-in this incident-was counselled by management and afterwards demonstrated his ability.to successfully parallel the Diesel Generator to the Essential Power bus. No further corrective actions are ,

-planned. 'I I

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