ML17305A873

Responds to Bulletin 88-005 Re Product Forms Other than Fittings & Flanges for Plant.Significant Number of Lugs Delivered to Plant.Util Should Be Notified,If NRC Previous Review of Records Has Identified Other Product Forms

ML17305A873
Person / Time
Site:	Palo Verde
Issue date:	06/08/1990
From:	Conway W ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
161-03268-WFC-J, 161-3268-WFC-J, IEB-88-005, IEB-88-5, NUDOCS 9006200292
Download: ML17305A873 (6)

Text

ACCELERATED ITRJBUTION DEMON~TION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9006200292 DOC.DATE: 90/06/08 NOTARIZED: NO FACIL:STN-50-528 Palo Verde Nuclear Station, Unit 1, Arizona Publi

'OCKET 1T 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 CONWAY,W.F. Arizona Public Service Co. (formerly Arizona Nuclear Power RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Responds to Bulletin 88-005 re product forms other than fittings 6 flanges for plant.

DISTRIBUTION CODE: IE11D TITLE: Bulletin Response COPIES RECEIVED:LTR (50 DKT)

ENCL 0 sIZE:

NOTES 05000528 Standardized plant. 05000529 Standardized plant. 05000530 RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME, LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA PD5 PD PETERSON,S. CHAN,T INTERNAL: AEOD/DOA AEOD/DSP/TPAB NRR/DET/EMEB9H3 NRR/DOEA/OEAB1 1 NRR/DOEA/OGCB11 NRR/DREP/PEPB9D RR/BST 8E2 NRR/PMAS/ILRB12 E~-L 02 RES/DSIR/EIB RGN FILE 01 EXTERNAL'PDR NRC PDR NSIC NOTES:

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!

TOTAL NUMBER OF COPIES REQUIRED: LTTR 19 ENCL

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Arizona Public Service Company P.O. BOX 53999 ~ PHOENIX. ARIZONA 85072-3999 WILLIAMF. CONWAY 161-032~IH:/W EXECUTIVEVICEPRESIDENT NUCI.EAR June 8, 1990 Docket No. STN 50-528/529/530 Document Control Desk U.S. Nuclear Regulatory Commission Mail Station Pl-37 Washington, D. C. 20555

Reference:

Letter from S. R. Peterson NRC to W. F. Conway, APS dated May 18, 1990.

Subject:

Bulletin 88-05 Regarding Product Forms Other than Fittings and Flanges for Palo Verde Nuclear Generating Station

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Unit, 1, 2, and 3 Bull'etin 88-05 Regarding Product Forms Other Than Fittings and Flanges File: 90-056-026 The referenced letter requested information regarding the disposition of product forms other than fittings and flanges supplied by Piping Supplies Incorporated (PSI), West Jersey Manufacturing (WJM), and Chews Landing Metal Manufacturers (CLM).

As a result of the work associated with NRC Bulletin 88-05, it was determined that a significant number of lugs were delivered to Palo Verde. APS is reviewing its records to determine if other product forms have been If other forms are identified, APS will notify the NRC and provide delivered. a plan to disposition the material. If the NRC, through their previous review of records IIas identified any other product forms used at Palo Verde, APS would expect to be notified.

APS proposes to address the issue of lugs by utilizing an analytical approach to justify the adequacy of the lug material.

NUREG-1402 Section 3 "Conclusions" supports an analytical approach since it states that the analytical procedures used to qualify the nonconforming material and the results of the analyses provide an adequate basis for resolving the staff's concerns with respect to demonstrating the adequacy of the material for service.

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k U. S. Nuclear Regulatory Commission 161-03X&4kZ/JM}

Page 2 June 8, 1990 The approach will be as follows:

• Calculate maximum lug loadings for each pipe diameter using the pipe wall strength as the governing stress location.

• Compute the lug steel strength required to carry these lug loads.

• Demonstrate that these strengths are less than the strength for the lowest strength ASHE material (45 ksi tensile strength).'he justification for this approach is based on the existing calculations and the inherent conservatism in lug design. If the anticipated results of this approach are not as expected, a new approach will be developed.

Based on the analytical approach and the inherent conservatism in the lug design, the identification, testing and preparation of a justification for continued operation is not warranted (items 1-3 of the referenced letter).

The task is scheduled to be completed by October 19, 1990 including the response to item 4.

Sincerely, WFC/JHg/tas CC: T. L. Chan S. R. Peterson D. H. Coe A. H. Gutterman J. B. Hartin Per NUREG-1402, the use of the lowest strength ASHE material (tensile strength of 45 ksi) for this evaluation is supported with the findings of the industry-wide test results for the blind flanges that were fabricated from plate material. The flange material identified by these tests was similar to the ASHE lowest strength material (tensile strength of 45 ksi). Since the lugs were fabricated from plate material, we are confident that the ASHE lowest strength material considered in the evaluation is appropriate.

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