ML20116E872

Special Rept 92-004::on 920927,five Ton CO-2 Unit for DG Bldg Isolated for Greater than 14 Days to Allow Investigation of Inadvertent Sys Discharge Into 1J 4,160 Volt Bus.Operable Status Restored on 921025

ML20116E872
Person / Time
Site:	Farley
Issue date:	11/05/1992
From:	Woodard J SOUTHERN NUCLEAR OPERATING CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
92-004, 92-4, NUDOCS 9211100058
Download: ML20116E872 (1)

Text

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• Soutnern Nucidar Operaung Company -

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- !  : Post Offce Box 1295 r

• .' fwninoham. Alabama 35201

. ' Telepp 205 868 '086 ,

A o. we Southem Nudear Operating Company

[*,[pQ November 5, 1992 . the Louthern 0!ect'C Sy%em .

Docket Nos. 50-348  :

U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 Joseph M. Farley Nuclear Plant - Unit 1 Special Report No.92-004 C02 Isolated to 4160 Volt Bus.lJ  ;

For Greater Than 14 Dqvs Gentlemen:

This Special Report is being sutmitted in accordance with Technical-Specification 3.7.11.3 due to the fact that-the CO2system to the IJ 4160-volis bus was not restorea to operable' status within _14 days.

On 9-27-92 at 0845, the 5 ton _C02 unit for the Diesel Generator. Building- '!

s . -was isolated to allow investigation:of-an. inadvertent system discharge into the'lJ 4160-volt's bus.---On-10-2-92-at 1130,:the 5 ton _CO2 L unit to the:

' Diesel Generator Building was unisolated;Lhowever, the CO2 piotection for 4160 volts' bus -1J- remained disabled to a " V for troubleshooting and. repair.-

of that portion of the system _ . An:inve:. .gation into the inadvertent 1 ~ .

system discharge.reycaled a DC? system ground 'roblem, lhe DC system ground-was due to a loose:te:minal inside the master valve box and defective: heat-

-detectors. :Due-to operational' constraints the 4160 volts-bus 1J could not1 be de-energized to-allow replacement of the defective: heat detectors within a

14. days. .All;Technict) Specification required actions associated:with q 3.7.11.3 were met.for. the. time period in which the 5 ton unit.wassisolated. j-Corrective maintenance was completed for the. portion of'the Diesel Building- ,

C02 1 system supplying the-IJ'4160. volts bus and the system vas restored-to'-

operable status:on- 10-25-92 at..1600. All_ Technical Specifit ation. required actions associated with 3.7.11.3'were met for:the time peris t in which the!

'CO2 system was -isolated to the IJ 4160 volts bus _

E Respectfully submitted,-

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i 92.111000589211oY PDR- ADOCK 05000348- J h -

S- (N. . . Woodard~

PDR LCDC:cht-92.3396 L Lcc: i Mr. S. D. Ebneter

^Mr! S; T. Hoffman

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-Mr. G. F^ Mantell -

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