ML17312A577

Special Rept 1-SR-96-01 on:960225,unit 1 Turbine Tripped Followed by Reactor Power Cutback.Caused by Lightning Strike.Unit 1 Will Not Be Connected to Grid Until Repairs Can Be Made to C Neutral Bushing of Transformer

ML17312A577
Person / Time
Site:	Palo Verde
Issue date:	03/01/1996
From:	James M. Levine ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
1-SR-96-01, 1-SR-96-1, 192-00962-JML-B, 192-962-JML-B, NUDOCS 9603120059
Download: ML17312A577 (6)

Text

~ CATEGORY 1 REGULATORY INFORMATION DISTRIBUTION &STEM

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I (RIDS)'CCESSION NBR:9603120059 DOC.DATE: 96/03/01 NOTARIZED: NO DOCKET FACIL:STN-50-528 Palo Verde Nuclear Station, Unit 1, Arizona Publi 05000528 AUTH. NAME AUTHOR AFFILIATION LEVINE,J.M. Arizona Public Service Co. (formerly Arizona Nuclear Power RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Special rept 1-SR-96-01 on:960225,unit 1 turbine tripped followed by reactor power cutback. Caused by lightning strike. Unit 1 will not be connected to grid until repairs can be made to C neutral bushing of transformer.

DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR ENCL SIZE:

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

E NOTES:STANDARDIZED PLANT 05000528 G

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD4-2 PD 1 1 HOLIANI B 1 1 INTERNAL: ACRS 1 1 2 2 AEOD/SPD/RRAB 1 1 1 1 NRR/DE/ECGB 1 1 NRR/DE/EELB 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 D EXTERNAL: L ST LOBBY WARD 1 1 LITCO BRYCE,J H 2 2 NOAC MURPHY,G.A 1 1 NOAC POORE,W. 1 1 NRC PDR 1 1 NUDOCS FULL TXT 1 1 N

NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM OWFN SD-5(EXT. 415-2083) TO ELIMINATE YOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED: LTTR 26 ENCL 26 4

A Arizona Public Service Company PALO VERDE NUCLEAR GENERATING STATION P 0 BOX 52034 ~ PHOENIX, ARIZONA 85072-2034 192-00962- JML/BAG/8E JAMES M. LEVINE March 1, 1996 VICE PRESIOEMT NUCLEAR PAOCUCTION 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 1 Docket No. STN 50-528 (License No. NPF-41)

Special Report 1-SR-96-001 Enclosed please find Special Report 1-SR-96-001 prepared and submitted pursuant to PVNGS Emergency Plan Implementing Procedure (EPIP-03), "Emergency Classification Implementing Actions". This report discusses a condition requiring the declaration of a NotiTication of Unusual Event due to an lightning strike affecting the Protected Area resulting in visible damage to permanent structures or equipment.

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

Sincerely, JML/BAG/BE/pv Attachment cc: L. J. Callan (all with attachment)

K. E. Perkins K. E. Johnston i.lCGGS 9603'120059 'TI60301 PDR ADQCK 05000528 8 PDR

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ENCLOSURE PALO VERDE NUCLEAR GENERATING STATION UNIT 1 Notification of Unusual Event DOCKET NO. 50-528, LICENSE NO. NPF-41 SPECIAL REPORT 1-SR-96-001

PALO VERDE NUCLEAR GENERATING STATION UNIT 1 Notification of Unusual Event DOCKET NO. 50-528, LICENSE NO. NPF-41 SPECIAL REPORT 1-SR-96-001 This Special Report is being provided pursuant to PVNGS Emergency Plan Implementing Procedure (EPIP-03), "Emergency Classification Implementing Actions" to report a condition requiring the declaration of a Notification of Unusual Event (NUE) for Palo Verde Unit 1 at approximately 2032 MST on February 25, 1996. The NUE was terminated at approximately 2046 MST on February 25, 1996.

On February 25, 1996, at approximately 2017 MST, Palo Verde Unit 1 was operating at approximately 100 percent power in Mode 1 (POWER OPERATION) when a lightning strike occurred on the "C" phase of Main Transformer NBNX01 resulting in a turbine trip followed by a reactor power cutback. At approximately the same time, Unit 3 experienced a main turbine trip due to a Power Load Unbalance on the grid.

At approximately 2032 MST, it was determined that a lightning strike affecting the Protected Area had occurred and the event was classified as a NUE in accordance with EPIP-02. The Nuclear Regulatory Commission (NRC) Operations Center was notified at approximately 2110 MST.

At approximately 2046 MST on February 25, 1996, the NUE was terminated in accordance with EPIP-03. Unit 1 will not be connected to the grid until repairs can be made to the "C" and neutral bushing of Main Transformer NBNX01. Unit 3 experienced no major complications or equipment problems and has restarted. 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.