ML17313A439

Forwards Suppl 9 to CENPD-279, Annual Rept on Abb CE ECCS Performance Evaluation Models, Per 10CFR50.46(a)(3)(ii). Rept Describes Four Sets of Changes or Errors Determined to Have Impact on Models Used at Pvngs,Units 1,2 & 3

ML17313A439
Person / Time
Site:	Palo Verde
Issue date:	06/17/1998
From:	James M. Levine ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML17313A441	List: ML17313A439
References
102-04135-JML-S, 102-4135-JML-S, NUDOCS 9806260057
Download: ML17313A439 (6)

Text

CATEGORY 1 REGULA 'Y INFORMATION DISTRIBUTIO SYSTEM (RIDS)

ACCESSION NBR:980 6260057 DOC.DATE: 98/06/17 NOTARIZED: NO DOCKET ¹ FACIL:STN-50-528 Palo Verde Nuclear Station, Unit 1, Arizona Publi 05000528 STN-50-529 Palo Verde Nuclear Station, Unit 2, 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:

Fowards Suppl 9 to CENPD, "Annual Rept of ABB CE ECCS Performance Evaluation Models," per 10CFR50.46(a)(3)(ii).

Rept describes four sets of changes or errors determined to have impact on models used at PVNGS,Units 1,2 6 3.

DISTRIBUTION CODE: A001D COPIES RECEIVED:LTR ENCL SIZE:

TITLE: OR Submittal: General Distribution NOTES:STANDARDIZED PLANT 05000528 Standardized plant. 05000529()

Standardized plant. 05000530 R

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD4-2 LA 1 1 PD4-2 PD 1 1 FIELDS,M 1 1 INTERNAL: ACRS 1 1 F~E C~E!fgE~ 1 1 1 NRR/DE/ECGB/A 1 1 NRR/DE/EMCB 1 1 NRR/DRCH/HICB 1 1 NRR/DSSA/SPLB 1 1 D NRR/DSSA/SRZB 1 1 NUDOCS-ABSTRACT 1 1 OGC/HDS2 1 0 EXTERNAL: NOAC NRC PDR 1 1 E

N NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE. TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS OR REDUCE THE NUMBER OF COPIES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT THE DOCUMENT CONTROL DESK (DCD) ON EXTENSION 415-2083 TOTAL NUMBER OF COPIES REQUIRED: LTTR 14 ENCL 13

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James M. Levine TEL (602)3934300 Mail Station 7602 Palo Verde Nuclear Senior Vice President FAX (602)3936077 P.O. Box 52034 Generating Station Nuclear Phoenix, AZ 65072-2034 10 CFR 50.46 102-04135-J ML/SAB/RMW =

June 17, 1998 U. S. Nuclear Regulatory Commission ATi N: Document Control Desk Mail Station P1-37 Washington, DC 20555-0001

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Units 1, 2, and 3 Docket Nos. STN 50-628/629/530 Errors in Emergency Core Cooling System (ECCS) Performance Evaluation Models, 10 CFR 50.46(a)(3)(ii) Annual Report.

Pursuant to 10 CFR 50.46(a)(3)(ii), Arizona Public Service Company (APS) has enclosed the Combustion Engineering Owners Group (GEOG) Annual Report on ABB CE ECCS Performance Evaluation Models, CENPD-279, Supplement 9, dated March 1998. This report describes four sets of changes or errors that have been determined to have an impact on the ECCS performance evaluation models that are utilized for PVNGS.

Appendix A of this report is specific to PVNGS and describes the impact of the most significant ECCS performance evaluation modeling error on the PVNGS units. All other appendices of this report are plant-specific to other CE facilities and have not been included as part of this submittal.

The error described in Section 3.4 of the GEOG report, Decay Heat Energy Redistribution Factor Error, required APS to take appropriate compensatory action to ensure that the performance criteria for the ECCS would not be exceeded in the event of a Loss of Coolant Accident. This action was previously reported in APS letter to NRC 102-04011-WEI/SAB/RMW, dated September 14, 1997.

980Mb0057 980bi7 PDR P

ADQCK 05000528 PDR Y

U. S. Nuclear Regulatory Commission A%I N: Document Control Desk Errors in Emergency Core Cooling System (ECCS) Performance Evaluation Models, 10 CFR 50.46(a)(3)(ii) Annual Report.

Page 2 This letter does not make any commitments to the NRC. Please contact Mr. Scott Bauer at (602) 393-5978 if you have any questions or would like additional information regarding this matter.

Sincerely, Enclosure JML/SAB/RMW/rlh cc: E. W. Merschoff K. E. Perkins M. B: Fields J. H. Moorman Mr. Joe Cleary ABB Combustion Engineering Nuclear Power 2000 Day Hill Road CEP 9612-1916 Windsor, CT 06095

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ENCLOSURE ABB CE Annual Report on ABB CE ECCS Performance Evaluation Models, CENPD-279, Supplement 9