1CAN050705, ANO - 1 Weld Overlay Examination Results
| ML072420397 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 05/22/2007 |
| From: | James D Entergy Operations |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 1CAN050705 | |
| Download: ML072420397 (9) | |
Text
a Entergy
~ Entergy Operations, Inc.
1448 S.R. 333 Russellville. AR 72802 Tel 479-858-4619 Dale E. James Manager, Licensing 1CAN050705 May 22, 2007 U. S. Nuclear Regulatory Commission Attn.: Document Control Desk Washington, DC 20555-0001
SUBJECT:
Weld Overlay Examination Results Arkansas Nuclear One, Unit 1 Docket No. 50-313 License No. DPR-51
REFERENCES:
- 1. Entergy Operations, Inc. letter CNRO-2007-00014 to the NRC dated March 22, 2007
- 2. NRC letter to Entergy Operations, Inc., dated April 6, 2007
Dear Sir or Madam:
In Reference #1, Entergy Operations, Inc. (Entergy) submitted to the NRC staff a revised Request for Alternative ANO1-R&R-010, which requested approval to install full structural weld overlays on dissimilar metal welds of pressurizer nozzles at Arkansas Nuclear One, Unit 1 (ANO-1). The staff approved this request via Reference #2.
In Reference #1, Entergy committed to submit to the staff the following information pertaining to ultra sonic examinations performed on the overlays:
" Weld overlay examination results including a list of indications detected;
" 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; and
- A discussion of any repairs to the weld overlay material and/or base metal and the reason for the repairs.
This information is provided in Enclosure 1. Should you have any questions regarding this information, please contact Guy Davant at (601) 368-5756.
1 CAN050705 Page 2 of 2 This letter contains no new commitments.
Sincerely, DEJ/GHD/ghd
Enclosure:
Summary of Weld Overlay Ultrasonic Inspections for Pressurizer and Hot Leg Dissimilar Metal Welds cc: Mr. W. A. Eaton (ECH)
Mr. J. S. Forbes (ECH)
Mr. T. G. Mitchell (ANO)
Dr. Bruce S. Mallet Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064 NRC Senior Resident Inspector Arkansas Nuclear One P. 0. Box 310 London, AR 72847 U. S. Nuclear Regulatory Commission Attn: Mr. A. B. Wang MS 0-7 D1 Washington, DC 20555-0001 bcc: Mr. W. B. Abraham (G-ADM2-LIC)
Mr. C. A. Bottemiller (G-ADM2-LIC)
Ms. C. D. Faison (K-WPO-12C)
Ms. S. T. Fontenot (W-GSB-318)
Mr. K. W. Hall (M-ECH-36)
Ms. K. A. Maher (R-GSB-42)
Mr. R. J. Murillo (W-GSB-318)
Mr. R. S. Lewis (M-ECH-36)
Mr. D. N. Lorfing (R-GSB-42)
Mr. D. J. Ropson (K-WPO-11 D)
Mr. W. D. Sims (N-GSB-59)
Ms. D. S. Waldron (N-GSB-64)
Echelon Information Management File [20]
ENCLOSURE 1CAN050705
SUMMARY
OF WELD OVERLAY ULTRASONIC INSPECTIONS FOR PRESSURIZER AND HOT LEG DISSIMILAR METAL WELDS
StructuralIntegrityAssociates, Inc.
3315 Almaden Expressway Suite 24 San Jose, CA 95118-1557 Phone: 408-978-8200 Fax: 408-978-8964 www.structint.com mtaylor@structint.com May 18, 2007 SIR-07-162-NPS, Rev. 0 Mr. Robert Gordon Entergy Operations, Inc.
Arkansas Nuclear One 1448 SR 333 Russellville, AR 72802
Subject:
Summary of Weld Overlay Ultrasonic Inspections for Pressurizer Surge, Hot Leg Surge, Spray, Safety Valve and Pressure Relief Valve Nozzle-to-Safe End Welds at Arkansas Nuclear One, Unit 1
Reference:
Entergy Operations, Inc., ANO- 1, Request for Alternative ANO I-RandR-0 10, March 22, 2007
Dear Mr. Gordon:
The following attachment is transmitted in support of Entergy's response to commitments in the above-referenced request for alternative:
Attachment:
A report summarizing the ultrasonic inspections performed on Arkansas Nuclear One Unit 1 weld overlays. The inspections were performed using SI's PDI qualified ultrasonic inspection procedure and inspectors.
Flaw indications were detected in one of the overlays, and disposition of the indications is summarized in the attachment.
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. Robert Gordon, Entergy Operations, Inc. May 18, 2007 SIR-07-162-NPS Page 2 of 2 If you have any questions or comments regarding this summary, please contact one of the undersigned.
Prepared by: Verified by:
05/11/07 05/18/07 Ned Finney Date Johnaeaydenu N Date Senior Consultant Manager, Nuclear NDE NDE Level III Approved by:
05/18/07 Moses Taylor, P.E. Date Associate nnn Attachment cc: Dixon Parker Project File: ANO-39Q-406 V StructuralIntegrity Associates, Inc.
Attachment Summary of Weld Overlay Ultrasonic Inspections for Pressurizer Surge, Hot Leg Surge, Spray, Safety Valve and Pressure Relief Valve Nozzle-to-Safe End Welds at Arkansas Nuclear One, Unit 1 Attachment to SIR-07-162-NPS, Rev. 0 1 Structural Integrity Associates, Inc.
Ultrasonic Examination Procedure SI-UT- 126, Revision 3, Procedurefor the PhasedArray UltrasonicExamination of Weld Overlaid Similar 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.
2.5" Relief Valve Nozzle Weld Overlay Examination Component Identification: WOL-03, CV-1000 Nozzle to Flange, ISI Examination No.05-041 Examination Date: 05/04/07 Examination Time: 1150 to 1215 and 2025 to 2041 Examination Regions: Weld Overlay Material, Outer 25% Dissimilar Metal Weld and Adjacent Base Material.
Examination Angles: Axial - 00 through 830, Circumferential - 0' through 62' Examination Summary: The examination of the required volumes in the weld overlay and underlying upper 25% of base material contained no suspected flaw indication. 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. 100% of the Code required volume was examined with no limitations.
3" Safety Valve Nozzle PSV-1001 Weld Overlay Examination Component Identification: WOL-01, PSV-1001, ISI Examination No.05-042 Examination Date: 05/03/07 Examination Time: 18:00 through 2000 and 1100 to 1145 (5/4)
Examination Regions: Weld Overlay Material, Outer 25% Dissimilar Metal Weld and Adjacent Base Material.
Examination Angles: Axial - 00 through 83', Circumferential - 0' through 630 Examination Summary: The examination of the underlying 25% of the dissimilar metal weld, stainless steel, and base material contained no suspected flaw indications. The examination of the weld overlay revealed six recordable indications at the base material to weld overlay interface as the low alloy steel nozzle transitions into the nozzle boss. The indications were characterized in accordance with IWA-3300 of Section XI of the ASME Code. All indications were characterized as subsurface planar indications. The indications were then evaluated in accordance with IWB-3514; Code Case N-740; and Relief Request ANO-1-R&R-010. Five of the indications were determined to be acceptable in accordance with these requirements. One of the indications was found to be unacceptable. The unacceptable indication was determined to be outside the required structural region of the weld overlay as it was tapered into the nozzle. This indication was mechanically removed and subsequent ultrasonic re-examination on 05/05/07 between 0142 and 0257 confirmed there were no indications present. Since the indication was outside the required overlay length for structural reinforcement and the remaining overlay is acceptable after removal of the indication, repair welding of the indication removal area was not required.
Attachment to SIR-07-162-NPS, Rev. 0 2 Structural Integrity Associates, Inc.
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. 100% of the Code required volume was examined with no limitations.
3" Safety Valve Nozzle PSV-1002 Weld Overlay Examination Component Identification: WOL-02, PSV-1002, ISI Examination No.05-040 Examination Date: 05/03/07 Examination Time: 1704 through 1800 Examination Regions: Weld Overlay Material, Outer 25% Dissimilar Metal Weld and Adjacent Base Material.
Examination Angles: Axial - 00 through 830, Circumferential - 00 through 63' Examination Summary: The examination of the required volumes in the weld overlay and underlying upper 25% of base material contained no suspected flaw indication. 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. 100% of the Code required volume was examined with no limitations.
Pressurizer Spray Nozzle Weld Overlay Examination Component Identification: WOL-04, Pressurizer Spray, ISI Examination Nos.18-001, 18-001A Examination Date: 05/04/07 Examination Time: 0327 through 0525 Examination Regions: Weld Overlay Material, Outer 25% Dissimilar Metal Weld and Adjacent Base Material and Outer 25% Safe End-to-Pipe Weld and Adjacent Base Material.
Examination Angles: Axial - 0' through 830, Circumferential - 0' through 630 Examination Summary: The examination of the required volumes in the weld overlay and underlying upper 25% of base material contained no suspected flaw indication. 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. 100% of the code required volume was examined with no limitations.
Hot Leg Surge Nozzle Weld Overlay Examination Component Identification: WOL-05, Hot Leg Surge, ISI Examination No.16-001 Examination Date: 05/06/07 Examination Time: 0149 through 0306 Examination Regions: Weld Overlay Material, Outer 25% Dissimilar Metal Weld and Adjacent Base Material.
Examination Angles: Axial - 0' through 830, Circumferential - 0' through 630 Examination Summary: The examination of the required volumes in the weld overlay and underlying upper 25% of base material contained no suspected flaw indication. The examination Attachment to SIR-07-162-NPS, Rev. 0 3 Structural Integrity Associates, Inc.
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. 100% of the Code required volume was examined with no limitations.
Pressurizer Surge Nozzle Weld Overlay Examination Component Identification: WOL-06, Pressurizer Surge, ISI Examination No. 16-012A Examination Date: 05/06/07 Examination Time: 1711 through 1830 Examination Regions: Weld Overlay Material, Outer 25% Dissimilar Metal Weld and Adjacent Base Material.
Examination Angles: Axial - 00 through 830, Circumferential - 00 through 630 Examination Summary: The examination of the required volumes in the weld overlay and underlying upper 25% of base material contained no suspected flaw indication. 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. 100% of the Code required volume was examined with no limitations.
Attachment to SIR I 62-NPS, Rev. 0 4 StructuralIntegrity Associates, Inc.