ML17313A753

Provides Response to RAI Re GL 97-01, Degradation of Crdm/ CEDM Nozzles & Other Vessel Closure Head Penetrations. Ltr & Associated Encl Does Not Make Any Commitments to NRC

ML17313A753
Person / Time
Site:	Palo Verde
Issue date:	01/11/1999
From:	James M. Levine ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
102-04230-JML-S, 102-4230-JML-S, GL-97-01, GL-97-1, NUDOCS 9901210363
Download: ML17313A753 (9)

Text

CATEGORY 1 REGULAT RY INFORMATION DISTRIBUTIO SYSTEM (RXDS)

ACCESSION NBR:9901210363 DOC.DATE: 99/01/11 NOTARIZED: NO DOCKET 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 Records Management Branch (Document Control Desk)

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SUBJECT:

Provides response to RAX re GL 97-01, "Degradation of CRDM/

CEDM Nozzles & Other Vessel Closure Head Penetrations." Ltr A

& associated encl do not make any commitments to NRC.

T DISTRIBUTION CODE: A075D COPIES RECEIVED:LTR ENCL SIZE:

TITLE: GL-97-01 Degraduation of Control Rod Drive Mechanism & 0th r Vessel NOTES: STANDARDIZED PLANT 05000526 Standardized plant. 05000529 Standardized plant. 0500053%

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD4-2 LA 1 1 PD4-2'D 1 1 PDl-1/HAROLD,J 1 0 FIELDS,M 1 1 INTERNAL: LE CENTER 1 1 NRR/DE/EMCB 3 3 RES EMMEB 1 1 RGNo ~ ~ 1 1 EXTERNAL: NRC PDR 1 1 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 CONTROE DESK (DCD) ON EXTENSION 415-2083 TOTAL NUMBER OF COPIES REQUIRED: LTTR 11 ENCL 10

James M. L'evirte TEL (602) 393-5300 Mail Station 7602 Palo Verde Nuclear Vice President

'enior FAX (602)393.6077 P.O. Box 52034 Generating Station Nuclear Phoenix, AZ 85072-2034 102-04230-JML/SAB/RMW January 11, 1999 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station P1-37 Washington, DC 20555 Reference 1: Letter from David J. Modeen, Nuclear Energy Institute (NEI), to Mr. Gus C. Lainas, NRC, "Responses to NRC Requests for Additional Information on Generic Letter 97-01", dated December 11, 1998.

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Units 1, 2, and 3 Docket Nos. STN 50-528/529/530 Response to Request for Additional Information Regarding Generic Letter 97-01, "Degradation of CRDM/CEDM Nozzles and Other Vessel Closure Head Penetrations".

The Enclosure to this letter provides the additional information regarding Generic Letter 97-01, "Degradation of CRDM/CEDM Nozzles and Other Vessel Closure Head Penetrations", for the Palo Verde Nuclear Generating Station that was requested in your letter to Arizona Public Service Company (APS) dated September 4, 1998. This letter and the associated enclosure do not make any commitments to the NRC.

l 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 M. B. Fields J. H. Moorman 9'ttOi2i036G PDR ADQCK 990iii 05000528 P PDR

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ENCLOSURE Response to Request for Additional Information Regarding Generic Letter 97-01, "Degradation of CRDM/CEDM Nozzle and Other Vessel Closure Head Penetrations".

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~NRC R t Designate which crack susceptibility model is being endorsed for the assessment of CEDM penetration nozzles at the Palo Verde Nuclear Generating Station Unit Nos. 1, 2, and 3 (PVNGS). Indicate how the susceptibility model being endorsed relates to the CEOG's integrated program for assessing the CEDM penetration nozzles at ABB-CE designed plants, and whether or not the design of the susceptibility model is consistent with the contents of Topical Report CE NPSD-1085. If the ABB-CE's PITM model is being endorsed for the assessment of CEDM penetration nozzles at PVNGS, address items a. through e. that follow. If the Dominion Engineering susceptibility model is being endorsed for the assessment of CEDM penetration nozzles at PVNGS, address the items f. through i. that follow.

If the PITM models are bein endorsed for the assessment of our CEDM enetration nozzles:

Provide an expanded discussion and additional details describing how the time-to-failure model in the PITM relates to the PITM's time-to-initiation model. In particular, include an expanded discussion of how the PITM model relates growth of postulated flaws to the time-to-initiation model, and how the two aspects relate to each other and to the probability of failure methodology.

b. Provide the latest PITM susceptibility ranking of CEDM penetration nozzles, and if applicable of the vessel head instrumentation nozzles at PVNGS relative to the rankings of those at the other CEOG member plants.

c. Provide a description of how the PITM model for assessing postulated flaws in vessel head penetration nozzles was bench-marked, and list and discuss the standards the models were bench-marked against.

.d. Provide any additional information regarding how the model will be refined to allow the input of plant-specific inspection data into the model's analysis methodology.

e. Describe how the variability in the product forms, material specifications, and heat treatments used to fabricate each CEDM penetration nozzle at the GEOG member utilities are addressed in the PITM model.

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lf the susce tibilit model develo ed b Dominion En ineerin is bein endorsed for the assessment of our CEDM enetration nozzles:

Provide a description of how the various product forms, material specifications, and heat treatments used to fabricate each CEDM penetration nozzle at the GEOG member utilities are handled in the Dominion Engineering susceptibility model.

g. Provide any additional information, if available, regarding how the model will be refined to allow the input of plant-specific inspection data into the model's analysis methodology.

Describe how the Dominion Engineering crack initiation and crack growth models for assessing postulated flaws in vessel head penetration nozzles were bench-marked, and a listing and discussion of the standards the models were bench-marked against.

Provide the latest model susceptibility rankings of CEDM penetration nozzles in GEOG member plants based on the results of the, Dominion Engineering susceptibility model analyses of these CEDM and ICI nozzles.

APS Res onse APS participated in an industry effort that was coordinated by NEI to develop a generic response to the NRC's requests for additional information regarding Generic Letter 97-

01. The generic responses that were developed through this effort were provided to the NRC in Reference 1. Therefore, the APS response to the above requested information will refer to the appropriate enclosures of Reference 1.

The first paragraph of the requested information requires certain information regarding the crack susceptibility model that is being endorsed for the assessment of CEDM penetration nozzles at PVNGS. This information is provided in Enclosure 4 of Reference 1. Since the endorsed model is the EPRI model, which was developed from the Dominion Engineering model, items a. through e. of the requested information are not applicable. The responses to items f. through i. are as follows:

Item f: Refer to Enclosure 2, Question 1, Response 1.a, of Reference 1.

Item g: Refer to Enclosure 2, Question 3, Response 3.a, of Reference 1.

Item h: Refer to Enclosure 2, Question 2, Response 2.a, of Reference 1.

Item I: Refer to Enclosure 2, Question 4, Response 4, of Reference 1.

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