ML20052A433

Ro:On 820217,electrician Found a 125/250-volt Dc Station Svc Batteries W/Low Specific Gravity.When Batteries Placed on Charge,Voltage Went from 130 to 142-volts Dc Causing Topaz Inverter to Trip on High Voltage

ML20052A433
Person / Time
Site:	Hatch
Issue date:	04/06/1982
From:	Nix H GEORGIA POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
PM-82-258, NUDOCS 8204280329
Download: ML20052A433 (2)

Text

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, Georg a Power Comparrf /

. Post Othee Box 442 Baaley Georg:a31513 "* r' 'I',

Telephone 912 367-7781 N p' -

912 537-9444 ' ,'.11'l.

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Edwin I. Hatch Nuclear Plant ;l Georgia Power tre samem rune sniem April 6,1982 PM-82-258 PLANT E. I. HATCH Special Report Docket No. 50-366 United States Nuclear Regulatory Commission q ' N e% .

Office of Inspection and Enforcement ,

Region II 4 .\

Suite 3100 , . -

101 Marietta Street e O6 )^ r 'P, C-Atlanta, Georgia 30303 8a ,

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ATTENTION: Mr. James P. O'Reilly 2.

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,xN Pursuant to Section 6.9.2 and 3.5.1 action: c. EJatch ttJni Technical Specifications, please find attached Sp e4difR ' ort.

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H. C. Nix Plant Manager HCN/SXB/gjg xc: G. F. Head J. T. Beckham, Jr.

T. V. Greene C. T. Jones S. X. Baxley Control Room File M-58 Document Control

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SPECIAL REPORT Georgia Power Company Plant E. I. Hatch Docket No. 50-366 HPCI INJECTION INTO REACTOR On 2-17-82 an electrician was performing Weekly Pilot Cell Surveillance and found the "A" 125/250 volts D.C. Station Service Batteries with low specific gravity. The electrician notified the Shift Foreman and began charging the batteries per procedure. When the batteries were placed on charge, the voltage went from 130 to 142 volts D.C. This caused the TOPAZ Inverter that supplies power to the "B" Reactor level instrument to trip on high voltage. The "B" level instrument went to zero causing the level controls to increase Reactor Feedpump flow which raised water level . The main and RFP turbines tripped on high water level and the reactor scrammed on TVS fast closure.

HPCI was manually started and injected to maintain water level. Level dropped to a minimum of minus 25 inches during the transient.

As of the date of this report there have been twenty-three (23) incidents with HPCI injections into the Reactor Vessel.

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