ML20058K494

Special Rept:On 931109,EDG Failed to Auto Start During Performance of Main Dam Auxiliary Power Diesel Periodic Test 1-PT-1 Due to Low Out of Spec Readings on Four 6 Volt Batteries.Batteries Replaced & Subj Test Completed

ML20058K494
Person / Time
Site:	North Anna
Issue date:	12/03/1993
From:	Ohanlon J VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	Crisp R FEDERAL ENERGY REGULATORY COMMISSION
References
F93-04, F93-4, NUDOCS 9312150260
Download: ML20058K494 (2)

Text

Justs P. Olimax innsbrook Technic.al Ccuter Vnce President ~ Kuclear Orcrations <000 Domimon ikwlewd Glen Allen. Ystgtnt.t 2.4000 l

, 804 2~.3 2101 \

O vrr u o etiwen December 3, 1993 Mr. R. W. Crisp Serial No. F93-024 Regional Director Federal Energy Regulatory Commission 3125 Presidential Parkway, Suite 300 Atlanta, Georgia 30340

Dear Mr. Crisp:

PROJECT NO. 6335-VA RQBTH ANNA HYDROELECTRIC PROJECT EMERGENCY DIESEL GENERATOR AUTO START FAILURE Pursuant to the requirements of 18 CFR 12.10(a), Conditions Affecting the Safety of a Project, this report documents a problem recently encountered with the Emergency Diesel Generator (EDG) at the North Anna Main Dam.

On November 9,1993, the EDG failed to auto start during the performance of the Main Dam Auxiliary Power Diesel Periodic Test (1-PT-1). Initial examination of component circuitry'did not identify any proble Tis. A corrective maintenance work order was immediately initiated to trouble-sh00t and repair the EDG. Trouble-shooting activities identified low out of specificatic readings on the four 6-volt batteries. The batteries were replaced and the EDG was started. Periodic Test 1-PT-1 was completed satisfactorily and the EDG was returned to service on November 9,1993.

The 6-volt batteries are routinely checked on a monthly basis by performance of preventative maintena; ice activities. The last preventative maintenance check on the batteries was satisfactorily performed on November 1,1993. A review of the maintenance work order history data base indicated that the affected batteries had been in service for at least nine years.

This event was reported by telephone to the Federal Energy Regulatory Commission at 1128 hours0.0131 days <br />0.313 hours <br />0.00187 weeks <br />4.29204e-4 months <br /> on November 9,1993. The Nuclear Regulatory Commission was also contacted by telephone at 1219 hours0.0141 days <br />0.339 hours <br />0.00202 weeks <br />4.638295e-4 months <br /> on November 9,1993.

Should you have any questions regarding this report, please contact us.

Very truly yours, hW)

D

p. (- Jg, 18no o

~

J. P. O'Hanlon 9312150260 931203 U PDR ADDcK O$000?38 O S r ,y y

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cc: U S. Nuclear Regulatory Commission Attn: Document Control Desk >

Washington, D. C. 20555 License Numbers: NPF-4/NPF-7 1 Docket Numbers: 50-338/50 339 U.S. Nuclear Regulatory Commission Region ll 101 Marietta Street, N.W.

Suite 2900 '

Atlanta, Georgia 30323  ;

Mr. R. D. McWhorter -

NRC Senior Resident inspector North Anna Power Station l

1 h

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