ML17306A279

Special Rept 3-SR-91-007:on 911115,mobile Crane Came in Contact W/Energized 13.8 Kv Power Line Resulting in Arcing of Crane Outrigger Pads to Ground & Burning of Asphalt Area in Contact W/Pads.Investigation Re Event Being Performed

ML17306A279
Person / Time
Site:	Palo Verde
Issue date:	11/20/1991
From:	James M. Levine ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
192-00754-JML-T, 192-754-JML-T, 3-SR-91-007, 3-SR-91-7, NUDOCS 9111270078
Download: ML17306A279 (6)

Text

ACCELERATED DISGBUTION DEMONS~ION SYSTEM I DOCKET g 05000530 REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)ACCESSION NBR:9111270078 DOC.DATE: 91/11/20 NOTARIZED:

NO FACIL:STN-50-530 Palo Verde Nuclear Station, Unit 3, Arizona Publi-AUTH.NAME AUTHOR AFFILIATION LEVINE,J.M.

Arizona Public Service Co..(formerly Arizona Nuclear Power RECIP.NAME RECIPIENT AFFILIATION

'ocument Control Branch (Document Control Desk)

SUBJECT:

Special Rept 3-,SR-91-007:on 911115,mobile crane came in contact w/energized 13.8 kV power line resulting in arcing of crane outrigger pads to ground&burning of asphalt area in contact w/pads.Investigation re event being performed.

DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR ENCL/SIZE: TITLE: 50.73/50.9 Licensee Event Report (LER), ncident Rpt, etc.D NOTES:Standardized plant.RECIPIENT ID CODE/NAME PD5 LA TRAMMELL, C INTERNAL: ACNW AEOD/DOA AEOD/ROAB/DSP NRR/DET/EMEB 7E NRR/DLPQ/LPEB10 NRR/DREP/PRPBll NRR/DST/SICB8H3 NRR/DST/SRXB 8E RES/DSIR/EIB EXTERNAL EG&G BRYCE i J~H NRC PDR NSIC POORE,W.NOTES COPIES LTTR ENCL 1 1 1 1 2 2 1 1 2 2 ,1 1 1.1'2 1 l.1 1 1 1 3 3 1 1 1 1 1 1 RECIPIENT ID CODE/NAME PD5 PD THOMPSON,M ACRS AEOD/DSP/TPAB NRR/DET/ECMB 9H NRR/DLPQ/LHFB10 NRR/DOEA/OEAB NRR/DST/SELB 8D NRR DST/LB8Dl G 02 RGN5 FILE 01 L ST LOBBY WARD NSIC MURPHY,G.A NUDOCS FULL TXT COPXES LTTR ENCL 1 1'1 1 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1/05000530.A D D D.NOTE TO ALL"RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE iVASTE!CONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT.20079)TO ELIMINATE YOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!TOTAL NUMBER OF COPXES REQUIRED: LTTR 35 ENCL 35 D JAMES M.LEVINE VICE PRESIDENT NUCLEAR PRODUCTION Arizona Public Service Company PALO VERDE NUCLEAR GENERATING STATION P.O, BOX 52034~PHOENIX, ARIZONA 85072-2034 192-00754-JML/TRB/KR November 20, 1991 U.S.Nuclear Regulatory Commi:ssion Attention:

Document Control'esk Mail Station Pl-37 Washington, D.C.20555'ear Sirs:

Subject:

Palo Verde Nuclear Generating Station (PVNGS)Unit 3 Docket No.STN 50-530 (License No.NPF-74)Special Report 3-SR-91-007 File'1-020-404 Attached please find Special Report 3-SR'-91-007 prepared and submitted pursuant to Emergency Plan Implementing Procedure (EPIP-03).

This report discusses a condition requiring the declaration of a NOTIFICATION OF UNUSUAL EVENT due to a fire in the protected area lasting longer than 10 minutes.If you have any questions, please contact Thomas R.Bradish, Compliance Manager, at (602)393-2521.Very truly yours, JML/TRB/KR Attachment cc: W.F.Conway J.BE Martin D.H.Coe (all with attachment) 9I11:70078 91II20 PDR AGO=K 0500CI,':-30

PDP, 0

Palo Verde Nuclear Generating Station Unit 3 Notification of Unusual Event Docket No.,50-530 License No.NPF-74 , Special Report No.3-SR-91-007 This Special Report is being provided pursuant to Emergency Plan Implementing Procedure (EPIP-03),"Notification of Unusual Event Implementing Actions" to report a condition (i.e., a fire in the protected area lasting longer than 10 minutes)requiring the declaration of an Unusual Event in Palo Verde Unit 3 at 0928 MST on November 15, 1991.The Unusual Event was terminated at 1002 MST on November 15, 1991.On November 15, 1991, at approximately 0910 MST, Palo Verde Unit 3 was in Mode 3 (HOT STANDBY)when a mobile crane located inside the protected area came in contact with an energized 13.8 kV power line resulting in the arcing of the crane outrigger pads to ground and the burning of the asphalt area immediately in contact with the pads.At approximately 0910 MST, the site Fire Department was notified of the fire inside the protected area.At approximately 0913 MST, the Control Room Shift Supervisor was notified by an electrical foreman via telephone that the crane had come in contact with, an energized 13.8 kV overhead line, that a fire was in progress, and that the line required deenergization.

'he electrical foreman identified the line that required deenergization as NAN-S06 to NAN-S04.At approximately 0913 MST, Control Room personnel deenergized the line by securing power to the NAN-S06 bus, which also resulted in a loss of offsite power (LOP)signal to the Train B 4160 volt Class lE bus.This resulted in a Train B LOP Engineered Safety Feature Actuation System (ESFAS)actuation.

The Train B Emergency Diesel Generator (EDG)started and loaded per design.Subsequently, at approximately 0914 MST, the Control Room was notified by radio that the 13.8 kV overhead line in contact with the crane was still energized.

At this time, Control Room personnel determined that the crane was actually in contact with the 13.8 kV overhead line supplied by'he NAN-S05 bus.Control Room personnel proceeded to reenergize the NAN-S06 bus prior to deenergizing the NAN-S05 bus, thereby maintaining the availability of offsite power.At approximately 0915 MST, the Fire Department response team (i.e., personnel, fire engine, and command vehicle)arrived, at the scene of the fire.At approximately 0922 MST, Control Room personnel deenergized the NAN-S05 bus, following radio confirmation with the Fire;Department Incident Commander, which also resulted in a loss of offsite power (LOP)signal to the Train A 4160 volt Class lE bus per design.This resulted in a Train A LOP ESFAS actuation as designed.The Train A EDG started and loaded per design.At approximately 0928 MST, the Shift Supervisor received information from the Fire Department Incident Commander that the fire was out and that there were no apparent injuries.The Emergency Plan Implementing Procedures require the declaration of a Notification of Unusual Event (NUE)for a fire in the protected area lasting longer than 10 minutes.At approximately 0928 MST, the Shift Supervisor declared a Notification of Unusual Event.By approximately l

NRC Document Control Desk Page 2 Special Report 3-SR-91-007 0941 MST, on November 15, 1991, the appropriate state and local agencies were notified of the condition requiring the declaration of an NUE (i.e., fire in the protected area).At approximately 0946 MST on November 15, 1991, the Nuclear Regulatory Commission (NRG)Operations Center was notified.At approximately 1002 MST on November 15, 1991, the NUE was terminated in accordance with EPIP-03'y approximately 1012 MST on November 15, 1991, the appropriate state and local agencies and the NRC Operations Center were notified of'the termination of the NUE.Further investigation into the circumstances surrounding this event is.being'performed in accordance with the PVNGS Incident Investigation Program.The results of the investigation will be reported pursuant to 10CFR50.73.