ML071210249
| ML071210249 | |
| Person / Time | |
|---|---|
| Site: | McGuire  |
| Issue date: | 04/19/2007 |
| From: | Gordon Peterson Duke Energy Carolinas, Duke Power Co |
| To: | Document Control Desk, NRC/NRR/ADRO |
| References | |
| 07-GO-0001 | |
| Download: ML071210249 (7) | |
Text
RDuke R. PETERSON rPower.
Vice President A Duke Energy Company McGuire Nuclear Station Duke Power MG01VP / 12700 Hagers Ferry Rd.
Huntersville, NC 28078-9340 704 875 5333 704 875 4809 fax grpeters@duke-energy. com April 19, 2007 U. S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555-0001
Subject:
Duke Power Company LLC d/b/a Duke Energy Carolinas, LLC (Duke)
McGuire Nuclear Station, Unit 1 Docket No. 50-369 Relief Request 07-GO-0001 Pursuant to 10 CFR 50.55a(a)(3)(i), on January 24, 2007, Duke requested NRC approval to use alternatives to the American Society of Mechanical Engineers Boiler and Pressure Vessel Code (ASME Code), Section Xl Inservice Inspection (ISI) requirements for McGuire Unit 1. The proposed alternative approach was to support application of full structural weld overlays on various pressurizer nozzle-to-safe end welds.
The January 24, 2007 request contained the following regulatory commitment:
"The following information will be submitted to the NRC within 14 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.
0 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" The information required by the commitment above is included as Attachment 1. The inspections were performed using the EPRI Performance Demonstration Initiative (PDI) qualified ultrasonic inspection procedure. No flaw indications were detected in the overlays.
www.dukepower.com 4-u-1f7
U. S. Nuclear Regulatory Commission April 19, 2007 Page 2 Questions regarding this submittal should be directed to Mitch Hatley at (704) 875-5456 or Kay Crane at (704) 875-4306.
Gary R. Peterson Attachment
U. S. Nuclear Regulatory Commission April 19, 2007 Page 3 cc:
W. D. Travers, Region II Administrator U. S. Nuclear Regulatory Commission Atlanta Federal Center, Suite 23T85 61 Forsyth St., SW Atlanta, GA 30303 J. F. Stang, NRC Senior Project Manager U. S. Nuclear Regulatory Commission 11555 Rockville Pike Mail Stop 0-8 H 4A Rockville, MD 20852-2738 J. B. Brady NRC Senior Resident Inspector McGuire Nuclear Station
Attachment Summary of Ultrasonic Examinations of Preemptive Weld Overlays for Pressurizer Nozzle Locations Containing Alloy 600 Materials Attachment to SIR-07-114-NPS, Rev. 0 1 of 4 Structural Integrity Associates, Inc.
Ultrasonic Examination Procedure SI-UT-126, Revision 0 and Revision 3, Procedure for the Phased Array Ultrasonic Examination of Weld Overlaid Similar and Dissimilar Metal Welds, were used during the examinations. SI-UT-126, Revision 0 was used for the examination of the Surge nozzle weld overlay; S1-UT-126, Revision 3 was used for the examination of the remaining weld overlays. 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-W4BSE Examination Date: 04/09/07 Examination Time: 20:30 through 21:30 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: 00 through 660 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.
Safety Nozzle NC1 Weld Overlay Examination Component Identification: I-NCI 1-PZR-W3SE Examination Date: 04/09/07 Examination Time: 19:30 through 20:30 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 83' Circumferential Examination Angles: 00 through 66' 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.
Safety Nozzle NC2 Weld Overlay Examination Component Identification: I-NC2 I-PZR-W4ASE Examination Date: 04/09/07 Examination Time: 20:00 through 21:00 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 83' Circumferential Examination Angles: 00 through 660 Attachment to SIR-07-114-NPS, Rev. 0 2 of 4 Structural Integrity Associates, Inc.
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.
Safety Nozzle NC3 Weld Overlay Examination Component Identification: 1-NC3 1-PZR-W4CSE Examination Date: 04/09/07 Examination Time: 21:30 through 22:30 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: 0' through 830 Circumferential Examination Angles: 00 through 66' 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.
Spray Nozzle Weld Overlay Examination Component Identification: 1 -PZR-W2SE Examination Date: 04/09/07 Examination Time: 18:30 through 19:30 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: 0' through 830 Circumferential Examination Angles: 00 through 650; 00 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 /
coupling effectiveness during the examination.
Surge Nozzle Weld Overlay Examination Component Identification: 1-PZR-W 1SE Examination Date: 04/04/07 Examination Time: 02:00 through 04:00 Examination Regions: Weld Overlay Material, Outer 25% Dissimilar Metal Weld & Adjacent Base Material and Outer 25% Safe End-to-Pipe Weld & Adjacent Base Material.
Axial Examination Angles: 00 through 830 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 Attachment to SIR-07-114-NPS, Rev. 0 3 of 4 V
Structural Integrity Associates, Inc.
from the inside surface of the component which were useful for monitoring search unit contact /
coupling effectiveness during the examination.
Attachment to SIR-07-114-NPS, Rev. 0 4 of 4 Structural Integrity Associates, Inc.