ML081490095

Inservice Inspection Relief Request RR-III-05 Summary of Ultrasonic Examinations of Preemptive Weld Overlays for Pressurizer Nozzle Locations Containing Alloy 600 Materials

ML081490095
Person / Time
Site:	Summer
Issue date:	05/23/2008
From:	Archie J South Carolina Electric & Gas Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML081490095 (9)

Text

Jeffrey B. Archie Vice President,Nuclear Operations

_ _803.345.4214 A SCANA COMPANY May 23, 2008 Document Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555

Subject:

VIRGIL C. SUMMER NUCLEAR STATION (VCSNS)

DOCKET NO. 50-395 OPERATING LICENSE NO. NPF-12 INSERVICE INSPECTION RELIEF REQUEST RR-III-05

SUMMARY

OF ULTRASONIC EXAMINATIONS OF PREEMPTIVE WELD OVERLAYS FOR PRESSURIZER NOZZLE LOCATIONS CONTAINING ALLOY 600 MATERIALS

References:

1. Jeffrey B. Archie (SCE&G) letter to Document Control Desk (NRC),

Request to Use Alternatives to ASME Code Section XI Requirements for Application of Weld Overlay Repairs (RR-III-05), June 1, 2007

2. R. E. Martin (NRC) Letter to J. B. Archie (SCE&G) - Proposed Alternative for the Application of Weld Overlay on Dissimilar Metal Welds of Pressurizer Nozzles (TAC No. MD5765), March 25, 2008 On June 1, 2007, South Carolina Electric & Gas Company (SCE&G) submitted a letter to the Nuclear Regulatory Commission (NRC) requesting relief from the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code,Section XI, "Rules for Inservice Inspection of Nuclear Power Plant Components," Article IWA-4000, "Repair/Replacement Activities" (Reference 1). The proposed alternative, based on ASME Code Case N-740, was requested to support VCSNS's installation of full structural weld overlays on dissimilar metal welds of pressurizer nozzles during Refueling Outage 17. This request was approved by the NRC on March 25, 2008 (Reference 2).

In that request, SCE&G committed to submit to the NRC the following information regarding the final ultrasonic examinations of the completed weld overlays:

0 Weld overlay examination results including a listing of indications detected.

• Disposition of all indications using the standards of ASME Code,Section XI, IWB-3514-2 and/or IWB-3514-3 criteria and, if possible, the type and nature of the indications.

• A discussion of any repairs to the weld overlay material and/or base metal and the reason for repairs.

SCE&G I Virgil C.Summer Nuclear Station P.0. Box 88 *Jenkinsville, South Carolina 29065 .T (803) 345.5209 - www.sceg.com Q 4 ý

Document Control Desk C-07-00439 RC-08-0077 Page 2 of 2 This information was to be provided within fourteen (14) days from completing the final ultrasonic examinations on the completed weld overlays.

The final ultrasonic examination of the weld overlays was completed on May 12, 2008.

No indications requiring disposition were found and no repairs to the weld overlay material and/or base metal were performed. The Attachment to this letter contains the required report on the final ultrasonic examination, fulfilling commitment number 1 of the June 1, 2007, letter (Reference 1).

This document contains no new regulatory commitment.

Should you have any questions, please call Mr. Bruce Thompson at (803) 931-5042.

JT/JBA/jt

Attachment:

Summary of Ultrasonic Examinations of Preemptive Weld Overlays for Pressurizer Nozzle Locations Containing Alloy 600 Materials, as provided by Structural Integrity Associates, Inc.

c: K. B. Marsh S. A. Byrne N, S. Carns J. H. Hamilton R, J. White L. A. Reyes R. E. Martin NRC Resident Inspector M. N. Browne K. M. Sutton D. L. Abstance P. Ledbetter EPIX Coordinator INPO Records Center J&H Marsh & McLennan NSRC RTS (C-07-00439)

File (810.19-1, 815.02 [IB2004-01])

DMS (RC-08-0077)

Document Control Desk Attachment C-07-00439 RC-08-0077 Page 1 of 7 Virgil C. Summer Nuclear Station (VCSNS)

Inservice Inspection Relief Request RR-111-05 Summary. of Ultrasonic Examinations of Preemptive Weld Overlays for Pressurizer Nozzle Locations Containing Alloy 600 Materials Prepared by:

Structural Integrity Associates, Inc.

(6 Pages)

• Structural Integrity Associates, Inc.

3315 Almaden Expressway Suite 24 San Jose, CA 95118-1557 Phone: 408-978-8200 Fax: 408-978-8964 www.structint.com bsmith@structint.com May 19, 2008 SIR-08-125-NPS, Rev. 0' Mr. A. Pitts Turbeville South Carolina Electric & Gas V. C. Summer Nuclear Station PO Box 88 Jenkinsville, SC 29065

Subject:

Summary of Weld Overlay Ultrasonic Examinations for Pressurizer Nozzle Dissimilar Metal Welds for Alloy 600 Mitigation at Virgil C. Summer Nuclear Station

Reference:

Request to Use Alternatives to ASME Code Section XI Requirements for Application of Weld Overlay Repairs (RR-III-05), Virgil C. Summer Nuclear Station, Docket No.

50/395, Operating License No. NPF-12

Dear Mr. Turbeville:

The following attachment is transmitted in support of South Carolina Electric & Gas commitments in the above-referenced request for alternative:

Attachment:

A report summarizing the ultrasonic examinations performed on the Virgil C. Summer Nuclear Station weld overlays. The examinations were performed using Structural Integrity's PDI qualified ultrasonic examination procedure and examiners. 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.

Prepared by: Verified by:

on.ayyd 05/13/08 ______ __ 05/19/08 Jo Date Harold E. Que)n Date Sr. Consultant, NDE Level III TSU-NDE Executive Director Annapolis, MD Austin, TX Centennial, CO Cerritos, CA Chattanooga, TN Huntersville, NC Ontario, Canada South Jordon, UT Stonington, CT Uniontown, OH 410-571-0861 512-533-9191 303-792-0077 562-402-3076 423-553-1180 704-597-5554 905-829-9817 801-676-0216 880-536-3982 330-899-9753

Mr. A. Pitts Turbeville May 19, 2008 SIR-08-125-NPS, Rev. 0 Page 2 of 2 Approved by:

05/19/08 Barry W. Smith, P.E. Date Senior Consultant Attachment cc: Nick Jenkins Project File: VCS-07Q-402 U StructuralIntegrity Associates, Inc.

Attachment Summary of Weld Overlay Ultrasonic Examinations for Pressurizer Nozzle Dissimilar Metal Welds for Alloy 600 Mitigation at Virgil C. Summer Nuclear Station Attachment to SIR-08-125-NPS, Rev. 0 1 of4 StructuralIntegrity Associates, Inc.

Ultrasonic Examination Procedure SI-UT-1,26, Revision 3, Procedurefor the PhasedArray UltrasonicExamination of Weld OverlaidSimilar and DissimilarMetal Welds, was used for examinations of the Pressurizer Surge, Spray and Safety/Relief Valve Nozzle weld overlays (WOL). This procedure, and the examiners who applied the procedure, are qualified through the PDI Program at the EPRI NDE Center.

Surge Nozzle Weld Overlay Examination Component Identification: Surge (1) - 4500-14(OL), 4500A-1(DM), 4500A-2 (SM)

Examination Date: 10 May, 2008 Examination Time: 13:45 to 15:31 Weld Overlay Regions Examined: Overlay, Weld and Base Material (Outer 25%) Dissimilar Metal (DM) Weld and Adjacent Stainless Steel (SS) Weld Inclusive Range of Axial Examination Angles: 0' through 840 Inclusive Range of Circumferential Examination Angles: 0' through 700 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 / coupling effectiveness during the examination. During the course of the examinations, 100% coverage of the weld overlay material and 100% coverage of the Code-required volume for the DM weld and the adjacent SS weld was achieved.

Spray Nozzle Weld Overlay Examination Component Identification: Spray (2) - 4503-47(OL), 4503-46(DM), 4503-45 (SM)

Examination Date: May 11 & 12, 2008 Examination Time: 23:50 (05/11/08) to 01:00 (05/12/08)

Weld Overlay Regions Examined: Overlay, Weld and Base Material (Outer 25%) Dissimilar Metal (DM) Weld and Adjacent Stainless Steel (SS) Weld Inclusive Range of Axial Examination Angles: 0' through 840 Inclusive Range of Circumferential Examination Angles: 0' through 610 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 / coupling effectiveness during the examination. During the course of the examinations, 100% coverage of the weld overlay material and 100% coverage of the Code-required volume for the DM weld and the adjacent SS weld was achieved.

Attachment to SIR-08-125-NPS, Rev. 0 2 of 4 Structural Integrity Associates, Inc.

Relief Valve Nozzle Weld Overlay Examination Component Identification: PORV(3) - 4502-24(OL), 4502-1(DM), 4502-2 (SM)

Examination Date: May 8, 2008 Examination Time: 1302 to 1617 Weld Overlay Regions Examined: Overlay, Weld and Base Material (Outer 25%) Dissimilar Metal (DM) Weld and Adjacent Stainless Steel (SS) Weld Inclusive Range of Axial Examination Angles:0' through 850 Inclusive Range of Circumferential Examination Angles: 0' through 650 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 / coupling effectiveness during the examination. During the course of the examinations, 100% coverage of the weld overlay material and 100% coverage of the Code-required volume for the DM weld and the adjacent SS weld was achieved.

Safety Valve Nozzle Weld Overlay Examination Component Identification: SRV(4A) - 4501-36(OL), 4501-23(DM), 4501-24 (SM)

Examination Date: May 8, 2008 Examination Time: 1302 to 1617 Weld Overlay Regions Examined: Overlay, Weld and Base Material (Outer 25%) Dissimilar Metal (DM) Weld and Adjacent Stainless Steel (SS) Weld Inclusive Range of Axial Examination Angles: 0' through 85' Inclusive Range of Circumferential Examination Angles: 0' through 65' 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 / coupling effectiveness during the examination. During the course of the examinations, 100% coverage of the weld overlay material and 100% coverage of the Code-required volume for the DM weld and the adjacent SS weld was achieved.

Attachment to SIR-08-125-NPS, Rev. 0 3 of 4 Structural Integrity Associates, Inc.

Safety Valve Nozzle Weld Overlay Examination Component Identification: SRV(4B) - 4501-35, 4501-12(DM), 4501-13 (SM)

Examination Date: May 8, 2008 Examination Time: 1302 to 1617 Weld Overlay Regions Examined: Overlay, Weld and Base Material (Outer 25%) Dissimilar Metal (DM) Weld and Adjacent Stainless Steel (SS) Weld Inclusive Range of Axial Examination Angles: 00 through 85' Inclusive Range of Circumferential Examination Angles: 0' through 65' 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 / coupling effectiveness during the examination. During the course of the examinations, 100% coverage of the weld overlay material and 100% coverage of the Code-required volume for the DM weld and the adjacent SS weld was achieved.

Safety Valve Nozzle Weld Overlay Examination Component Identification: SRV(4C) - 4501-34, 4501-1(DM), 4501-2 (SM)

Examination Date: May 11 & 12, 2008 Examination Time: 23:47 (05/11/08) to 00:50 (05/12/08)

Weld Overlay Regions Examined: Overlay, Weld and Base Material (Outer 25%) Dissimilar Metal (DM) Weld and Adjacent Stainless Steel (SS) Weld Inclusive Range of Axial Examination Angles: 00 through 850 Inclusive Range of Circumferential Examination Angles: 0' through 65' 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 / coupling effectiveness during the examination. During the course of the examinations, 100% coverage of the weld overlay material and 100% coverage of the Code-required volume for the DM weld and the adjacent SS weld was achieved.

Attachment to SIR-08-125-NPS, Rev. 0 4 of 4 Structural Integrity Associates, Inc.