ML17304A863

Special Rept:On 890103,facility Suffered Complete Loss of Offsite Power Due to Lightning Striking Circuits Between ESF Svc Transformers.Troubleshooting & Rework Performed & Two Primary Side Bushings Changed on Each Transformer

ML17304A863
Person / Time
Site:	Palo Verde
Issue date:	01/09/1989
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
192-00442-JGH, 192-442-JGH, 2-SR-89-001, 2-SR-89-1, NUDOCS 8901170140
Download: ML17304A863 (8)

Text

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ACCESSION NBR:8901170140 DOC.DATE: 89/Ol/09 NOTARIZED: NO DOCKET FACIL:STN-50-'529 Palo Verde Nuclear Station, Unit 2, Arizona Publi 05000529 AUTH. NAME - AUTHOR AFFILIATION HAYNES,J.G. Arizona Nuclear Power Project (formerly Arizona Public Serv RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Special rept:on 890103,facility loss offsite power caused by lightning striking circuit.

DISTRIBUTION CODE: IE22D COPIES RECEIVED:LTR i ENCL / SIZE:

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

NOTES:Standardized plant. 05000529 r

RECIPIENT COPIES RECIPIENT COPlES

• ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA 1 1 PD5 PD 1 1 CHAN,T 1 1 DAVIS,M -1 1 INTERNAL: ACRS MICHELSON 1 1 ACRS MOELLER 2 2 ACRS WYLIE 1 1 AEOD/DOA 1 1 AEOD/DSP/TPAB 1 1 AEOD/ROAB/DSP 2 2 ARM/DCTS/DAB 1 1 DEDRO 1 1 NRR/DEST/ADE 8H 1 1 NRR/DEST/ADS 7E 1 0 NRR/DEST/CEB 8H -

1 1 NRR/DEST/ESB 8D 1 1 NRR/DEST/ICSB 7 1 1 NRR/DEST/MEB 9H 1 1 NRR/DEST/MTB 9H 1 1 NRR/DEST/PSB 8D 1 1 NRR/DEST/RSB 8E 1 1 NRR/DEST/SGB 8D 1 1 NRR/DLPQ/QAB 10 NRR/DLPQ/HFB 10 NRR/DOEA/EAB NRR/DREP/RPB 10 ll 1 1

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S PIZASE HELP US IO REDUCE RESTEl (XNZACI'IHE DOCUMEMZ CGHZERL DESK RDCN Pl-37 (EXT. 20079) %0 ELIKENAXR MUR MME FRY DISTRIBVZIGN LISTS MR DOCUHEMIS KNJ DGHFT NEZDf TOTAL NUMBER OF COPIES REQUIRED: LTTR 47 ENCL 46

l Arizona Nuclear Power Project.

P.O. BOX 52034 ~ ~ PHOENIX. ARIZONA85072-2034 192-00442-JGH/TDS/JEM January 9, 1989 1

U.'. Nuclear Regulatory'Commission NRC Document Control Desk Washington, D.C. 20555

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

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

Special Report 2-SR-89-001 File: 89-020-404 Attached please find Special Report 2-SR-89-001 prepared and submitted pursuant to Emergency Plan Implementing Procedure -03. This report discusses a NOTIFICATION OF UNUSUAL EVENT due to a complete loss of offsite power to the

4. 16 Kv class 1E electrical busses.

If you have any questions, please contact T. D. Shriver, Compliance Manager at (602) 393-2521.

Very trul yours,

. J. G. Haynes Vice Preside'nt Nuclear Production JGH/TDS/JEM/kj Attachment cc: D. B. Karner (all w/a)

J. B. Martin T. J. Polich E. A. Licitra A. C. Gehr INPO Records Center R. T. Milstead C. F. Tedford F. L. Russo R. Godbehere R. Colson 89011~ <0 890109 PDp ADOCK 05000529 8

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Verde Nuclear Generating Sta Unit 2 Notification of Unusual Event Docket No. 50-529 License No. NPF-51 Special Report No. 2-SR-89-001 This Special Report is being provided pursuant to Emergency Plan Implementing Procedure (EPIP)-03 (Notification of Unusual Event Implementing Actions) to

"

report the declaration of a Notification of Unusual Event (NUE) for Palo Verde Unit 2. The NUE was declared pursuant to EPIP-02 (Emergency Classification) as a result of a complete loss of offsite power to the in.-plant 4. 16 Kv class 1E busses 2E-PBA-S03 and 2E-.PBB-S04.

At approximately 1940 HST on January 3, 1989, Palo Verde Unit 2 was operating in Hode 1 (POWER OPERATION) at approximately 100 percent power when a complete loss of offsite power to the 4. 16 Kv class lE busses 2E-PBA-S03 and 2E-PBB-S04 occurred. The loss of power (LOP) was caused by lightning striking the 13.8=

Kv circuit between the Engineered Safety Features (ESF) Service Transformer 2E-NBN-X03 and 13.8 Kv bus 2E-NAN-S05. Then, 0.8 second later lightning struck the 13,8 Kv circuit between ESF Ser'vice Transformer 2E-NBN-X04 and 13.8 Kv bus 2E-NAN-S06. Breakers 2E-NBN-S03A and 2E-NBN-S04A, ESF Service Transformers Normal Supply Breakers, tripped on Instantaneous Overcurrent and Phase Differential.'ue to the LOP on class IE 4. 16 Kv busses 2E-PBA-S03 and 2E-PBB-S04, the "A" and "B" Diesel Generators started and assumed the loads on 2E-PBA-S03 and 2E-PBB-S04 respectively.'echnical Specification Limiting Condition for Operation (LCO) 3.8; 1. 1 ACTIONS "a" and "d" were entered at 1940 HST on January 3, 1989.

At approximately 1959 HST on January 3, 1989 a,Notification of Unusual Event (NUE) was declared. At approximately 2010 HST on January 3, 1989 the appropriate state and local agencies were notified via the Notification and Alert Network (NAN). The Nuclear Regulatory Commission (NRC) Operations Center was notified at approximately 2034 HST on January 3, 1989.

Troubleshooting and rework were performed in accordance with approved work control documents. It was identified that the transformers were not damaged; however, two primary side bushings were changed on each transformer. After successful completion of appropriate retests, transformer 2E-NBN-X04 was energized at approximatey 1438 HST on January 4, 1989 and -paralleled with "B" diesel generator at approximatey 1646 'HST on January 4, 1989.

At approximatey 1648 HST on January 4, 1989, the NUE was terminated due to offsite power being restored to one class 1E 4. 16 Kv bus and ACTION "d" of LCO 3.8. 1. 1 was then exited.

At approximatey 1808 HST on January 4, 1989, transformer 2E-NBN-X03 was energized from offsite power. At approximatey 1925 HST on January 4, 1989, transformer 2E-NBN-X03 was paralleled with "A" diesel generator and offsite power was restored to class IE bus 2E-PBA-S03. LCO 3.8. 1. 1 ACTION "a" was then exited.

Special Report 2-S -001 Page 2 Throughout the event, the plant remained stable at approximately 100 percent power. The event did not result in any challenges to fission product barriers or result in any releases of radioactive materials. A Licensee Event Report will be submitted within 30-days of the event in accordance with 10CFR50.73.

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