ML17310A871

Forwards Voluntary LER 93-011-00 Reporting Potential to Have Substandard Voltages on Class 1E 480 Volt Power Sys,W/ Switchyard Voltage Between 95 & 100% & W/Startup Transformer Secondary Winding Fully Loaded at Rated Capacity of 70 Mva

ML17310A871
Person / Time
Site:	Palo Verde
Issue date:	12/25/1993
From:	James M. Levine ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML17310A872	List: ML17310A871 ML17310A873
References
192-00876-JML-B, 192-876-JML-B, NUDOCS 9401070049
Download: ML17310A871 (3)

Text

ACCELERATED 'RIBUTION DEMON TION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9401070049 DOC.DATE: 93/12/25 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:

Forwards voluntary LER 93-011-00 reporting potential to have substandard voltages on Class 1E 480 volt power sys,w/

switchyard voltage between 95 & 100% & w/startup transformer secondary winding fully loaded at rated capacity of 70 MVA. D DISTRIBUTION CODE: IE22T COPIES RECEIVED: LTR Q ENCL / SIZE:

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

/+ C/

NOTES:STANDARDIZED PLANT 05000528 RECIPIENT COPIES RECIPIENT COPIES D ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PDV LA 1 1 PDV PD 1 1 HOLIAN,B 1 1 TRAN,L 1 1 D

INTERNAL: ACRS 2 AEOD/DOA 1 1 AEOD/ DS P/TPA B 1 1 AEOD/ROAB/DSP 2 2 NRR/DE/EELB 1 1 NRR/DE/EMEB 1 1 NRR/DORS/OEAB 1 1 NRR/DRCH/HHFB 1 1 NRR/DRCH/HICB 1 1 NRR/DRCH/HOLB 1 1 NRR/DRIL/RPEB 1 1 NRR/DRSS/PRPB 2 2 EE~DSSB SPLB 1 1 NRR/DSSA/SRXB 1 1 REG FIL 02 1 1 RES/DSIR/EZB 1 1 N FILE 01 1 1 EXTERNAL: EG&G BRYCE,Z.H 2 2 L ST LOBBY WARD 1 1 NRC PDR 1 1 NSIC MURPHY,G.A 1 1 NSIC POORE,W. 1 1 NUDOCS FULL TXT 1 1 D

A D

D NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

FULL TEXT CONVERSION REQUIRED TOTAL NUMBER OF COPIES REQUIRED: LTTR 31 ENCL 31

4l Arizona Public Service Company PALO VERDE NUCLEAR GENERATING STATION P.O. 8OX 52034 ~ PHOENIX. ARIZONA85072-2034 192-00876-JML/BAG/KR JAMES M. LEVINE December 25, 1993 VICE PRESIDENT NUCLEAR PRODUCTION U. S. Nuclear Regulatory Commission Attention: Document Control Desk Mail Station P1-37 Washington, D.C. 20555

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Unit 1 Docket No. STN 50-528 (License No. NPF-41)

Ucensee Event Report 93-011-00 File: 93-020-404 Attached please find voluntary Licensee Event Report (LER) 93-011-00 prepared and submitted pursuant to 10CFR50.73. This LER reports that preliminary auxiliary power system calculations indicated that it may be possible to have substandard voltages on the Class 1E 480 V power system, with the switchyard voltage between 95 and 100 percent and with the startup transformer secondary winding fully loaded at its rated capacity of 70 MVA, without actuation of the Class 1E 4.16 kV bus undervoltage relays nor load shed and emergency diesel generator start. This scenario could result in the safety-related equipment powered from the Class 1E 480 V buses to be subject to operating below. the.90 percent voltage specified for minimum continuous operation.

In accordance with 10CFR50.73(d), a copy of this LER is being forwarded to the Regional Administrator, NRC Region V. If you have any questions, please contact Burton A. Grabo, Supervisor, Nuclear Regulatory Affairs, at (602) 393-6492.

Sincerely, "2g

~OP Ld~l~~~~

JML/BAG/KR/rv Attachment cc: W. F. Conway (all with attachment)

B. H. Faulkenberry K. E. Johnston INPO Records Center 9401070049'31225 PDR ADDCK 05000528 S PDR