ML20095C699

Special Rept:On 951107,spillway EDG Failed to Start During Performance of Monthly Periodic Test.Corrective Maint Work Order Immediately Initiated to trouble-shoot & Repair Spillway EDG

ML20095C699
Person / Time
Site:	North Anna
Issue date:	12/07/1995
From:	Saunders R VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	Crisp R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
F95-016, F95-16, NUDOCS 9512120167
Download: ML20095C699 (2)

Text

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December 7,1995 VNt0lNIA POWER Mr. R. W. Crisp Serial No. F95-016 Regional Director Fedotal Energy Regulatory Commission 3125 Presidential Parkway, Suite 300 Atlanta, Georgia 30340

Dear Mr. Crisp:

PROJECT NO. 6335-VA NORTH ANNA HYDROELECTRIC PROJECl[

EMERGENCY DIESEL GENERATOR STARLFAILURE Pursuant to the requirements of 18 CFR 12.10(a), Conditions Affecting the Safety of a Project, this report documents a problem encountered with the Spillway Emergency Diesel Generator (SEDG) at the North Anna Main Dam.

On November 7,1995, the SEDG failed to start during performance of the monthly periodic test. Once the pre-operational checks were completed, the selector switch was placed in the test position, but the SEDG failted to start. The Operations Shift Supervisor was notified of the failed start. A corrective maintenance work order was immediately initiated to trouble-shoot and repair the SEDG. Trouble shooting activities identified oxidized contacts on the remote selector switch and a control relay. I An open fuse was also identified. The contacts on the remote selector switch and  !

control relay were burnished, the fuse was replaced, and other associated I components were checked for unusual readings. No unusual readings were identified. The SEDG was then successfully started. The periodic test was completed satisfactorily, and the SEDG was returned to service on November 8,1995. The control relay will be replaced during the week of December 4,1995. The remote selector switch will be replaced upon receipt of parts ordered. This letter constitutes

, formal notification of near term corrective maintenance that is to be performed on the SEDG.

Failure of the SEDG to start did not pose any significant safety concems since normal AC power was available to operate the spillway gates. Additionally, the spillway gates are designed to be operated manually if a loss of both normal and emergency AC power occurs. Station procedures provide directions to Operations personnel if l manual gate control becomes necessary. '

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Q This event was reported by telephone to the Federal Energy Regulatoiy Commission at 0800 hours0.00926 days <br />0.222 hours <br />0.00132 weeks <br />3.044e-4 months <br /> on November 7,1995. The Nuclear Regulatory Cornmission was also contacted by telephone at 0948 hours0.011 days <br />0.263 hours <br />0.00157 weeks <br />3.60714e-4 months <br /> on November 7,1995 due to notification of an offsite agency in accordance with 10 CFR 50.72(b)(2)(vi).

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

Very truly yours, R. F. Saunders cc: U.S. Nuclear Regulatory Commission Aitn: Document Control Desk Washington, D. C. 20555 License Numbers: NPF-4/NPF-7 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

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