ML17311A644

Forwards Suppl 1 to LER 93-011 Per 10CFR50.73,reporting That Addl Undervoltage Scenario Has Been Identified That Could Result in Possible Double Sequencing of SR Equipment

ML17311A644
Person / Time
Site:	Palo Verde
Issue date:	02/06/1995
From:	James M. Levine ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML17311A645	List: ML17311A644
References
192-00918-JML-B, 192-918-JML-B, NUDOCS 9502160186
Download: ML17311A644 (4)

Text

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!'ACCELERATED RIDS PROCESSI.

REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9502160186 'DOC.DATE: 95/02/06 NOTARIZED- NO DOCKET FACIL:STN-50-528 Palo Verde Nuclear Station, Unit 1, Arizona Publi 05000528 STN-50-529 Palo Verde Nuclear Station, Unit. 2g Arizona Publi 05000529 STN-50-530 Palo Verde Nuclear Station, Unit 3, Arizona Publi 05000530 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 suppl 1 to LER 93-011 per 10CFR50.73,reporting that addi undervoltage scenario has been identified that could result in possible double sequencing of SR equipment.

DISTRIBUTION CODE: IE22T COPIES RECEIVED:LTR (

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

ENCL I SIZE: / +8 NOTES:STANDARDIZED PLANT 05000528 Standardized plant. 05000529 Standardized plant. 05000530 RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD4-2 PD 1 1 HOLIAN, B 1 1 TRAN,L 1 1 INTERNAL: ACRS 1 1 A~EO /~+D- 1 1 AEOD/SPD/RRAB 1 1 1 1 NRR/DE/ECGB 1 1 NRR/DE/EELB 1 1 NRR/DE/EMEB 1 1 NRR/DISP/PIPB 1 1 NRR/DOPS/OECB NRR/DRCH/HICB NRR/DRSS/PRPB 1

1 2

1 1

2 NRR/DRCH/HHFB NRR/DRCH/HOLB NRR/DSSA/SPLB 1,

1 1

1 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 NOAC MURPHY E G A 1 1 NOAC'OOREEW 1 1 NRC PDR 1 1 NUDOCS FULL TXT 1 1 iNOTE TO ALL "Rl DS" RE CI PI ENTS:

PLEASE HELP US TO REDUCE KVASTE! COYTACTTHE DOCL'i!EYTCOYTROL DESK, ROOM Pl-37 (EXT. 504-2083 ) TO ELI!if IRATE 'iOL R iAME PRO!iI DISTRIBUTION LISTS I:OR DOCI.'MERITS YOU DOY"I'EED!

FULL TEXT CONVERSION REQUIRED TOTAL NUMBER OF COPIES REQUIRED: LTTR 28 ENCL 28

f 0 4l I

Arizona Public Service Company PALO VERDE NUCLEAR GENERATING STATION P.O. BOX 52034 ~ PHOENIX. ARIZONA 85072-2034 JAMES M. LEVINE 192-00918-JML/BAG/KR VICE PRESIDENT NUCI.EAR PRODUCTION February 6, 1995 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station P1-37 Washington, D.C. 20555

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

-Units 1,-2, and 3 Docket Nos. STN 50-528, 50-529, 50-530 License Nos. NPF-41, NPF-51, NPF-74 Licensee Event Report 93-011-01 File: 94-020-404 Attached please find Supplement 1 to Licensee Event Report (LER)93-011 prepared and submitted pursuant to 10CFR50.73. This supplement reports that an additional undervoltage scenario has been identified that could result in the possible double sequencing of safety-related equipment. That is, following an emergency, safety features actuation, there exists the potential to not only start sequencing safety-related equipment on to the preferred offsite power, but to.load shed due to the Class 1E 4.16 kV undervoltage relays dropping out and not resetting, and then resequencing the equipment on to the emergency diesel generator.

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

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

K. E. Perkins K. E. Johnston Z(P~

., 9502160186

!QPQ Records Center 950206 PDR ADOCK 05000528 S PDR