ML20100M642

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Special Rept 50-366/1984-001:on 841018,personnel Found Blown Power Supply Circuit Fuses for Triaxial Time History Accelerographs.Caused by Short Circuited & Blown Fuse. Blown Fuse Replaced & Instrumentation Loop Repaired
ML20100M642
Person / Time
Site: Hatch Southern Nuclear icon.png
Issue date: 11/21/1984
From: Nix H
GEORGIA POWER CO.
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
50-366-1984-001, 50-366-1984-1, GM-84-1068, NUDOCS 8412120394
Download: ML20100M642 (2)


Text

, ., Georgia Power Company Post Office Box 439 a Baxley, ieorgi) 31513 Telephone 912 367-7781 912 537-9444 NOV to p j ' 03 GeorgiaPower Edwin 1. Hatch Nuclear Plant November 21, 1984 GM-84-1068 PLANT E. I. HATCH Special Report Docket No. 50-366 United States Nuclear Regulatory Commission Office of Inspection and Enforcement Region II Suite 3100 101 Marietta Street Atlanta, Georgia 30303 ATTENTION: Mr. James P. O'Reilly Attached is Special Report No. 50-366/1934-01. This report is required by Hatch Unit 2 Technical Specifications Section 3.3.6.2, ACTION a.

H.C. Nix /

General Manager HCN/TLE/djs xc: R. J. Kelly G. F. Head J.T. Beckham, Jr.

P. D. Rice K. M. Gillespie S. B. Tipps R. D. Baker Control Room Document Control 0 'U '

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LICENSEE .: GEORGIA POWER' COMPANY '

"Y I' I FACILITY-NAME EDWIN Is HATCH DOCKET NUMBER  : :53-366-1

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DESCRIPTION OF EVENT:

On Oc tober .18,- 1964, at apFroximately I 1700 CDT, during-performance ofi

'" SEISMIC INSTRUMENTATION FT&C" procedure (HNP-1-3980), personnel found blown ' power supply circuit fuses for Triaxial Time-History ,

LAccelerographs for the Diesel Generator building- 130' elevation'

-( 2 L 51-N021 ) , Reactor Building .87' elevation ~on drywell- pedestal (2L51-NO20), and drywell feedwater inlet to Reactor Pressure' Vessel-(2L51-N004). Further investigation revealed that the power. supply circuit to 2L51-N004 instrument loop was short circuited which,-in turn, ; blew the common circuit power supply fuse for all of'the above listed - accelerographs. The shorted power circuit cable to- the 2L51-N004 instrumentation loop was lifted, and the blown fuse was replaced. 2L51-N020 and 2L51-NO21 were returned to operable status.

During the . next extended drywell entry on. Unit 2, the short circuited power supply cable to the 2L51-N004 instrumentation loop will be investigated to. determine what- repair is necessary . to restore

- 2L51-N004 to ooerable status. The 2L51-N004 instrumentation loop will be repaired and returned to operable status.

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