ML17305B341

Discusses Evaluation of Bulletin 88-05 Re Product Forms Other than Fittings & Flanges for Facility

ML17305B341
Person / Time
Site:	Palo Verde
Issue date:	01/29/1991
From:	Dyer J Office of Nuclear Reactor Regulation
To:	Conway W ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
References
IEB-88-005, IEB-88-5, TAC-77041, TAC-77042, TAC-77043, NUDOCS 9102010104
Download: ML17305B341 (6)

Text

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l UNITEDSTATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 January 29, 1991 Docket: Nos. 50-528, 50-529 and 50-530 Mr. William F.

Conway Execut:ive Vice President, Nuclear Arizona Public Service Company P. 0.

Box 53999 Phoenix, Arizona 85072-3999

SUBJECT:

EVALUATION OF BULLETIN 88-05 REGARDING PRODUCT FORMS OTHER THAN FITTINGS AND FLANGES FOR PALO VERDE, UNITS I, 2 AND 3 (TAC NOS.

77041, 77042, AND 77043)

As a result of the resolution of NRC Bulletin 88-05 and Supplements I and 2 in NUREG 1402, the staff required an evaluation of the nonconforming product

, forms other than fittings and flanges which were supplied to Palo, Verde, Units I, 2 and 3.

Specifically, the staff determined that significant amounts of nonconforming welding lugs were'supplied by Piping Supplies, Inc. (PSI), West Jersey Manufacturing Company (WJM), and Chew Landing Metal Manufacturers, Inc.

(CLM) to Palo Verde as listed in Supplement 2 of the bulletin.

The licensee has responded with submittals dated June 8, 1990 and October 19, 1990 which contain an evaluation of the nonconforming welded pipe lugs installed at the plant.

The licensee determined that no product forms other than fitting, flanges and lugs were supplied to Palo Verde.

The licensee evaluated the installed welded lugs by obtaining a large sample of installed standard lug configurations and a smaller sample of installed nonstandard lug configurations.

For the standard lug sample, the licensee per formed bounding calculations to demonstrate that for the maximum piping stress at the welded attachments, the lugs possess adequate margin even if the lug material is the lowest possible strength steel.

For the nonstandard lug

sample, the licensee performed case-specific calculations and found these lugs also possess adequate margin for the maximum design loads.

The staff has reviewed the licensee's approach and methodology for evaluating the installed nonconforming welded lugs at Palo Verde 1, 2, and 3 and agrees that the licensee's evaluation provides adequate assurance that the lugs are capable of performing their intended function and provides an adequate margin of safety.

Otherwise, the licensee would be required to remove material currently installed, which (a) would involve unnecessary radiation exposure, and removal and reinstallation of new material, and (b) would not provide a

compensating increase in the level of quality and safety.

Although the staff 91020i0104 9i0i29 PDR ADDCK 05000528 P

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Mr. William F.

Conway finds that these lugs do not meet the ASME Boiler and Pressure Vessel Code requirements, the use of the installed lugs as an acceptable alternative is permitted in accordance with 10 CFR 50.55a(a)(3)(ii) because full compliance with all specific requirements would result in hardship or unusual difficulties without a compensating increase in the level of quality or safety.

As stated in NUREG-1402, further engineer ing evaluations of nonconforming material in safety-related applications may be performed by you under 10 CFR 50.59 and may not necessarily require NRC approval.

However, these evaluations are subject to audit and inspections at the disct etion of the NRC.

We consider this program to be implemented for tracking further actions.

This completes our review under TAC Nos. 77041,

77042, and 77043.

S incere ly, cc:

See next page Ortglnal Signed By:

James E. Dyer, Director Project Directorate V

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Mr. William F.

Conway Arizona Public Service Company Palo Verde CC:

Arthur C. Gehr, Esq.

Snell

& Wilmer 3100 Valley Center Phoenix, Arizona 85073 James A. Beoletto, Esq.

Southern California Edison Company P. 0.

Box 800

Rosemead, California 91770 Senior Resident Inspector U.S. Nuclear Regulatory Commission HC-03 Box 293-NR Buckeye, Arizona 85326 Regional Administrator, Region V

U. S. Nuclear Regulatory Commission 1450 Maria Lane Suite 210 Walnut Creek, California 94596 Mr. Charles B. Brinkman Washington Nuclear Operations Combustion Engineering, Inc.

12300 Twinbrook Parkway, Suite 330 Rockville, Maryland 20852 Mr. Charles Tedford, Director Arizona Radiation Regulatory Agency 4814 South 40 Street Phoenix, Arizona 85040 Chairman Maricopa County Board of Supervisors 111 South Third Avenue Phoenix, Arizona 85003 Jack R.

Newman, Esq.

Newman

& Holtzinger, P.C.

1615 L Street, N.W., Suite 1000 Washington, D.C.

20036

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