ML20196E824

Special Rept:On 881205,diesel Generator 1B Experienced Invalid Test Failure.Caused by Improper Adjustment of Voltage Regulator Due to Personnel Error.Operations Mgt Will Cover Incident W/Representative from Each Shift

ML20196E824
Person / Time
Site:	McGuire
Issue date:	12/05/1988
From:	Tucker H DUKE POWER CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
NUDOCS 8812120094
Download: ML20196E824 (3)

Text

..

ll l Duke havr Company Hu8 Tm P Q S w 33198 y,c, y,,,;p,,

g.,.7,g, f ,,y 7,g, Charlotte, N C 28242 ,

(7G6,13-4531 DUKEPOWER December 5, 1988 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555

Subject:

McGuire Nuclear Station, Unit 1 Docket No. 50-369 Diesel Generator Special Report Gentlemen:

Pursuant to McGuire Technical Specifications 4.8.1.1.3.c and 6.9.2, find attached a special report concerning an invalid failure of Diesel Generator 18.

Should there be any questions, please contact S.E, LeRoy at (704) 373-6233.

Very truly yours, 24/sn ,-

Hal B. Tucker Attachment xc: Mr. M.L. Ernst Deputy Administrat, , Region II U.S. Nuclear Regulatory Commission '

101 Marietta St., NW, Suite 2900 Atlanta, GA 30323 Mr. Darl Hood U.S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Washington. 0.C. 20555 Mr. P.K. Van Doorn NRC Resident inspector McGuire Nuclear Station Gs1212co94 ss1205 69 7 ADOCK 0000 j PDR

'\

4 .

Vocument Control Desk December 5, 1988 Page 2 bxc: 0.R. Br adyhaw R.C. Futrail .

S.A. Genahr R.L. Gill R.M. Glove:' (CNS) 1.W. He',lman '

C.L. M elia (ONS)

A.D.Harrington(fSD)

P.R. Herran J.J. Maher P,C. Nardoci A.R. Sipe (MNO)

R.O. Sharpe (MNS)

G.B. Swindlehuist l K.D. Thomas W.H. Taylor J.S. Warren J.W. Willis QA Tech. Services NRC Coordinator (EC 12/55) ,

fib 815-01 (20) i

[

r

)

e i

i f

4

,A M m- - -- -- . -.

d' e -

' U.S. Nuclear Regulatory Commission Document Control Desk December 5, 1988 ATTACHMENT Ouke Power Company McGuire Nuclear Station Diesel Generator 1B Special Report On November 5,1988 at 0428, Diesel Generator (DG) IB experienced an invalid test failure. Operations was in the process of performing the DG operability periodic test,(PT/1/A/4350/028) when the test failure occurred. The DG did not trip but the DG breaker did trip. An evaluation performed by Operations revealed that the OG breaner tripped due to improper adjustment of the voltage regulator during the operability test; therefore, the test failure has been attributed to personnel error. The DG was shutdown per procedure and the operability test was performed again. The results of this test revealed that no problems existed with the DG or DG controls, i

4 When the voltage regulator was improperly adjusted during the test run, the DG breaker tripped because the power factor and VARS were excessive; therefore, the

OG breaker performed properly for the conditions that existed during the test.

4 Operations management will cover this incident with a representative from each Operations shift in en upcoming Shift Supervisors meeting.

i Unit I was in No Mode (no fuel in the core) at the time of the test failure.

2 9

i t

i i

i