ML17311B172

Forwards PVNGS Unit 2 SG Evaluation. Rept Discusses ECT Exams Results Along W/Methodologies Used to Develop Unit 2 Run Time Analysis

ML17311B172
Person / Time
Site:	Palo Verde
Issue date:	09/07/1995
From:	Stewart W ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML17311B173	List: ML17311B172
References
102-03465-WLS-S, 102-3465-WLS-S, NUDOCS 9509120071
Download: ML17311B172 (7)

Text

P'R1OR1TY 1 (Re (ACCELERATED RIDS PROCESSING)

~ p INFORMATION DISTRIBUTION SYSTEM (RIDS)

II'EGULATORY ACCESSION NBR:9509120071 DOC.DATE: 95/09/07 NOTARIZED: NO DOCKET FACIL:STN-50-529 Palo Verde Nuclear Station, Unit 2, Arizona Publi 05000529 P AUTH. NAME AUTHOR AFFILIATION STEWART,W.L. Arizona Public Service Co. (formerly Arizona Nuclear Power RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Forwards "PVNGS Unit 2 SG Evaluation." Rept discusses ECT I

exams results along w/methodologies used to develop Unit 2 TITLE: OR run time analysis.

DISTRIBUTION CODE'OOID COPIES RECEIVED'LTR Submittal: General Distribution NOTES:Standardized plant.

L ENCL j SIZE: O 05000529 0

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RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD4-2 LA 1 1 PD4-2 PD 1 1 HOLIAN, B 1 1 TRAN L 1 1 INTERNAL: ACRS 6 6 ENTER 01 1 1 NRR/DE/EMCB 1 1 /~DRGH CB 1 1 NRR/DSSA/SPLB 1 1 NRR/DSSA/SRXB 1 1 NUDOCS-ABSTRACT 1 1 OGC/HDS2 1 0 EXTERNAL: NOAC 1 1 NRC PDR 1 1 D 0

N NOTE TO ALL "RIDS" RECIPIENTS:

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

TOTAL NUMBER OF COPIES REQUIRED: LTTR 19 ENCL 18

Arizona Public Service Company P.O. BOX 53999 ~ PHOENIX. ARIZONA 85072-3999 WILLIAML. STEWART 102-03465-WLS/SAB/JRP EXECUTIVEVICE PRESIDENT NUCLEAR September 7, 1995 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 2 Docket No. STN 50-529 Steam Generator Evaluation Report This letter transmits the Arizona Public Service Company (APS) Steam Generator Evaluation Report for the Palo Verde Nuclear Generation Station Unit 2. The enclosed report discusses recent Eddy Current Testing (ECT) examinations results along with methodologies used to develop a Unit 2 run time analysis.

In addition to the analyses and methodologies described in this report, APS has taken actions to provide defense-in-depth in order to prevent a challenge to nuclear safety.

These actions include preventive measures such as chemistry improvements, primary temperature reduction, N-16 monitoring improvements, comprehensive steam generator inspections, and conservative plugging criteria. An improved leak rate monitoring program and administrative limits on primary-to-secondary leakage provide additional assurance that an orderly shutdown will be conducted prior to a tube rupture.

Training of operations personnel for tube rupture events and upgrades to the emergency operating procedures permit faster identification and isolation of the affected steam generator. An analysis was also performed to demonstrate that, in the unlikely event of a main steam line break with consequential multiple tube ruptures, with the current administrative limits on reactor coolant system dose equivalent iodine, the resulting offsite doses are less than 10CFR100 limits.

Therefore, APS concludes that based on the ECT examinations and analyses presented in the enclosed report, the integrity of the Unit 2 steam generators will be maintained and the unit can be safely operated until the next scheduled refueling outage at the end of cycle 6.

9509120071 950907 PDR ADOCK 05000529 p PDR

r U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Steam Generator Evaluation Report Page 2 Should you have any questions, please call Scott A. Bauer at (602) 393-5978.

Sincerely, WLS/SAB/JRP/AI Enclosure cc: L. J. Callan K. E. Perkins B. E. Holian K. E. Johnston I. Barnes

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ENCLOSURE ARIZONA PUBLIC SERVICE COMPANY PALO VERDE NUCLEAR GENERATING STATION UNIT 2 STEAM GENERATOR EVALUATIONREPORT AUGUST 1995