ML17312A661

Special Rept 2-SR-96-001:on 960404,fault Occurred in Voltage Regulator for CR & Remote Shutdown Panel Essential Lighting, Resulting in Fire in 100 Ft Elevation of Cb B Battery Equipment Room & Requiring Declaration of Alert,Per EPIP-04

ML17312A661
Person / Time
Site:	Palo Verde
Issue date:	04/04/1996
From:	Overbeck G ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
192-00964-GRO-B, 192-964-GRO-B, 2-SR-96-001, 2-SR-96-1, NUDOCS 9604100271
Download: ML17312A661 (8)

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ACCESSION NBR:9604100271 DOC.DATE: 96/04/04 NOTARIZED:,NO DOCKET FACIL:STN-50-529 Palo Verde Nuclear Station, Unit 2, Arizona Publi 05000529 AUTH. NAME AUTHOR AFFILIATION OVERBECK,G.R. Arizona Public Service Co. (formerly Arizona Nuclear Power RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Special Rept 2-SR-96-001:on 960404,fault occurred in voltage regulator for CR & remote shutdown panel essential lighting, resulting in fire in elevation of control big "B" battery equipment room.

DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR ENCL SIZE:

TITLE: 50.73/50.9 Licensee Event Report (LER), Incident Rpt, etc.

NOTES:Standardized plant. 05000529 RECIPIENT COPIES RECIP1ENT COPIES 0 ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD4-2 PD 1 1 THOMASiC 1 1 R INTERNAL: ACRS 1 1 ~+EON/SP~~B 2 2 AEOD/SPD/RRAB 1 1 1 1 NRR/DE/ECGB 1 1 NRR/DE7EELB 1 1 NRR/DE/EMEB 1 1 NRR/DRCH/HHFB 1 1 NRR/DRCH/HICB 1 1 NRR/DRCH/HOLB 1 1 NRR/DRCH/HQMB 1 1 NRR/DRPM/PECB 1 1 NRR/DSSA/SPLB 1 1 NRR/DSSA/SRXB 1 .1 RES/DSIR/EIB 1 1 RGN4 FILE 01 1 1 EXTERNAL: L ST LOBBY WARD 1 1 LITCO BRYCE,J H 2 2 0 NOAC MURPHYgG.A 1 1 NOAC POORE,W. 1 1 NRC PDR 1 1 NUDOCS FULL TXT 1 1 NOTE TO ALL "RZDS" RECZPZENTS:

PLEASE HELP US TO REDUCE WASTEI CONTACT THE DOCUMENT CONTROL DESK/

ROOM OWFN SD-5(EXT. 415-2083) TO ELZMZNATE YOUR NAME FROM DZSTRZBUTZON LZSTS FOR DOCUMENTS YOU DON'T NEEDI TOTAL NUMBER OF COPIES REQUIRED: LTTR 26 ENCL 26

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Arizona Public Service Company PALO VERDE NUCLEAR GENERATING STATION P.O. BOX 52034 ~ PHOENIX. ARIZONA 850'T2-2034 192-00964-GRO/BAG/DRL GREGG R. OVERBECK VICE PRESIDENT April 4, 1996 NUCLEAR SUPPORT U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station P1-37 Washington, DC 20555-0001

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Unit 2 Docket No. STN 50-529 (License No. NPF-51)

Special Report 2-SR-96-001 Enclosed please find Special Report 2-SR-96-001 prepared and submitted pursuant to PVNGS Emergency Plan Implementing Procedure (EPIP-04), "Alert, Site Area and General Emergency Implementing Actions". This report discusses a condition requiring the declaration of an Alert due to a fire in a voltage regulator for Control Room and Remote Shutdown Panel essential lighting.

lf you.have any questions, please contact Burton A. Grabo, Section Leader, Nuclear Regulatory Affairs, at (602) 393-6492.

Sincerely, GRO/BAG/DRL Attachment cc: L. J. Callan (all with attachment)

K. E. Perkins K. E. Johnston ggrP 960410027i 960404 PDR ADOCK 05000529 S PDR

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ENCLOSURE PALO VERDE NUCLEAR GENERATING STATION UNIT 2 ALERT DOCKET NO. 50-529, LICENSE NO. NPF-51 SPECIAL REPORT 2-SR-96-001

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PALO VERDE NUCLEAR GENERATING STATION UNIT 2 ALERT DOCKET NO. 50-529, LICENSE NO. NPF-51 SPECIAL REPORT 2-SR-96-001 This Special Report is being provided pursuant to PVNGS Emergency Plan Implementing Procedure (EPIP-04), "Alert, Site Area and General Emergency Implementing Actions" to report

, a condition requiring the declaration of an Alert for Palo Verde Unit 2 at approximately 1714 MST on April 4, 1996. The Alert was terminated at approximately 1807 MST on April 4, 1996.

On April 4, 1996, at approximately 1700 MST, Palo Verde Unit 2 was in Mode 6 (REFUELING) when a fault occurred in the voltage regulator for Control Room and Remote Shutdown Panel Essential Lighting (2EQBBV02) resulting in a fire in the 100 foot elevation of the Control building "B" Battery Equipment Room and smoke in the 140 foot elevation of the Control building Uninterruptable Power Supply (2EQDNN02). Fire teams responded and both fires were considered out by 1735.

At approximately 1700 MST, a smoke condition was discovered on the 140 foot elevation of the Control Room area immediately behind the main control panel. This fire was at 2EQDNN02 which was down-powered. Light smoke was present in the local area. Main Control Room access was not lost and evacuation of Control Room staff was not required. HVAC equipment was switched to smoke removal mode and the smoke was quickly removed from the area. In addition, a second related fire was noted in the class DC "B" Switchgear Room and the event was classified as an Alert in accordance with EPIP-02. The Nuclear Regulatory Commission (NRC) Operations Center was notified at approximately 1810 MST.

At approximately 1807 MST on April 4, 1996, the Alert was terminated in accordance with EPIP-04. The fires caused a brief delay to work on the stuck fuel assembly. The assembly still is scheduled to be lifted and moved late Friday afternoon. Further investigation into the circumstances surrounding this event is being performed in accordance with the APS Incident Investigation Program. The results of the investigation will be reported pursuant to 10CFR50.73.

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