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Request for Relief Number 06-GO-001, Alloy 600 Pressurizer Weld Overlays - Submittal of Committed Information
	ML063610217
Person / Time
Site:	Catawba
Issue date:	12/14/2006
From:	Morris J; Duke Energy Carolinas, Duke Power Co
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	06-GO-001
	Download: ML063610217 (10)
	v • d • e

JAMES R. MORRIS

," Duke Vice President Or£nergyo Catawba Nuclear Station 4800 Concord Rd. / CN01VP York, SC 29745-9635 803 831 4251 803 831 3221 fax December 14, 2006 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555-0001

Subject:

Duke Power Company LLC d/b/a Duke Energy Carolinas, LLC (Duke)

Catawba Nuclear Station, Unit 1 Docket Number 50-413 Request for Relief Number 06-GO-001 Alloy 600 Pressurizer Weld Overlays - Submittal of Committed Information On July 27, 2006, as modified by letters dated September 11, 2006, September 27, 2006, and November 16, 2006, Duke submitted the subject request for relief regarding a proposed alternative approach to support application of full structural weld overlays on various pressurizer nozzle-to-safe end welds.

The September 27, 2006 letter contained the following two commitments:

1. The following information will be submitted to the NRC within fourteen days of completion of the final UT on each unit included in this relief request. Also included in the results will be a discussion of any repairs to the overlay material and/or base metal and the reason for the repair.

A listing of flaw indications detected

The disposition of all indications using the standards of ASME Section XI, IWB-3514-2 and/or IWB-3514-3 criteria and, if possible, The type and nature of the indications www. duke-energy. corn

U.S. Nuclear Regulatory Commission Page 2 December 14, 2006

2. Prior to entry into Mode 4 from the Catawba Unit 1 outage in the Fall of 2006, a summary of the results of the stress analyses demonstrating that the preemptive full structural weld overlay will not hinder the components from performing their design function will be submitted to the NRC.

The information required by Item 1 above is included in the attachment. The inspections were performed using Performance Demonstration Initiative (PDI) qualified ultrasonic inspection procedure and inspectors. No flaw indications were detected in the overlays, and thus no disposition of indications was required. The information required by Item 2 above will be submitted under separate correspondence prior to entry into Mode 4.

If you have any questions concerning this information, please contact L.J. Rudy at (803) 831-3084.

Very truly yours, James R. Morris LJR/s Attachment

U.S. Nuclear Regulatory Commission Page 3 December 14, 2006 xc (with attachment):

W.D. Travers, Administrator, Region II U.S. Nuclear Regulatory Commission Atlanta Federal Center 61 Forsyth St., SW, Suite 23T85 Atlanta, GA 30303-8931 J.F. Stang, Jr., NRC Senior Project Manager U.S. Nuclear Regulatory Commission 11555 Rockville Pike Mail Stop 0-8 H4A Rockville, MD 20852-2738 A.T. Sabisch, NRC Senior Resident Inspector Catawba Nuclear Station

Attachment Summary of Ultrasonic Examinations of Preemptive Weld Overlays for Pressurizer Nozzle Locations Containing Alloy 600 Materials

StructuralIntegrityAssociates, Inc.

3315 Almaden Expressway Suite 24 San Jose, CA 95118-1557 Phone: 408-978-8200 Fax: 408-978-8964 wwwstrdintom mtaylor@structint.com December 13, 2006 SIR-06-492, Rev. 0 MJT-06-024 Mr. Mitch Hatley Duke Energy Corporation McGuire Nuclear Station, Mail Code MG05SE 13225 Hagers Ferry Road Huntersville, NC 28078

Subject:

Summary of Weld Overlay Ultrasonic Inspections for Pressurizer Surge, Spray and Safety/Relief Nozzle-to-Safe End Welds at Catawba Nuclear Station, Unit 1

Reference:

Duke Energy Corporation, McGuire Nuclear Station Unit 2 and Catawba Nuclear Station Unit 1, Request for Alternative 06-GO-001, Revision 1, Sept. 27, 2006

Dear Mr. Hatley:

The following attachment is transmitted in support of Duke Energy's response to commitments in the above-referenced request for alternative:

Attachment:

A report summarizing the ultrasonic inspections performed on the Catawba Unit 1 weld overlays. The inspections were performed using SI's PDI qualified ultrasonic inspection procedure and inspectors. No flaw indications were detected in the overlays, and thus no disposition of indications was required.

If you have any questions or comments regarding this summary, please contact one of the undersigned.

Austin, TX Centennial, CO Charlotte, NC Stonington, CT Silver Spring, MD Sunrise, FL Uniontown, OH Whittier, CA Toronto, Canada 512-533-9191 303-792-0077 704-597-5554 860-536-3982 301-445-8200 954-572-2902 330-899-9753 562-944-8210 905-829-9817

Mr. Mitch Hatley, Duke Energy Corporation December 13, 2006 SIR-06-492, Rev. 0/MJT-06-024 Page 2 of 2 Prepared by: Verified by:

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12/13/06 12/13/06 John J. Hayden Date Michael S. Lashley Date Senior Consultant, NDE Associate Level 3 Approved by:

12/13/06 Moses Taylor, P.E. Date Associate ii Attachment cc: D. Llewellyn M. Ruis DUKE-42Q-406 V StructuralIntegrityAssociates, Inc.

Attachment Summary of Ultrasonic Examinations of Preemptive Weld Overlays for Pressurizer Nozzle Locations Containing Alloy 600 Materials Attachment to SIR-06-492, Rev. 0 /MJT-06-024 I of 4 StructuralIntegrity Associates, Inc.

Catawba Unit 1 Summary Ultrasonic Examination Report Ultrasonic Examination Procedure SI-UT-126, Revision 0, Procedurefor the PhasedArray UltrasonicExaminationof Weld OverlaidSimilar and DissimilarMetal Welds, was used during the examinations. This procedure, and the examiners who applied the procedure, are qualified through the PDI Program at the EPRI NDE Center.

Relief Nozzle Weld Overlay Examination Component Identification: PORV 1-PZR-W3SE Examination Date: 12/02/06 Examination Regions: Weld Overlay Material, Outer 25% Dissimilar Metal Weld & Adjacent Base Material and Outer 25% Safe End-to-Elbow Weld & Adjacent Base Material Axial Examination Angles: 00 through 830 - Circumferential Examination Angles: 0' through 630 Examination Summary: No suspected flaw indications were observed during the examinations.

The examination gain was adjusted to maintain the procedure-specified baseline noise level from 5% to 20% of full screen height. The lower range of examination angles detected responses from the inside surface of the component which were useful for monitoring search unit contact /