ML071710422
| ML071710422 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 06/18/2007 |
| From: | Mims D Arizona Public Service Co, Pinnacle West Capital Corp |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 102-05710-DCM/TNW/GAM | |
| Download: ML071710422 (2) | |
Text
i A
A subsidiary of Pinnacle West Capital Corporation Dwight C. Mims Mail Station 7605 Palo Verde Nuclear Vice President Tel. 623-393-5403 P.O. Box 52034 Generating Station Regulatory Affairs and Plant Improvement Fax 623-393-6077 Phoenix, Arizona 85072,2034 102-0571 0-DCM/TNW/GAM June 18, 2007 Attn: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001
Dear Sirs:
Subject:
Palo Verde Nuclear Generating Station (PVNGS)
Units 1, 2, and 3 Docket Nos. STN 50-528/529/530 Supplement to Inservice Inspection (ISI) Relief Request No. 36 -
Proposed Alternative Associated With the Use of Full-Structural Weld Overlays in the Repair of Dissimilar Metal Welds By letter no. 102-05641, dated February 8, 2007, Arizona Public Service Company (APS) submitted inservice inspection (ISI) relief request (RR) No. 36 for a proposed alternative associated with the use of full-structural weld overlays in the repair of dissimilar metal welds at PVNGS. In response to a request from the NRC on June 15, 2007, APS is revising paragraph no. 3(c)3 in Enclosure 1 (E-1) Page 11 of the February 8, 2007, submittal as follows (new additional wording is underlined):
The inservice examination acceptance standards of Table IWB-3514-2 shall be applied to planar indications detected in the weld overlay material. If the planar indication is found acceptable per Table IWB-3514-2, the weld overlay will be re-examined in accordance with 3(c)5. If the inservice acceptance criteria of Table IWB-3514-2 are not met, the planar flaw may be evaluated in accordance with IWB-3640, provided that the flaw is not caused by PWSCC. If accepted for continued service the weld overlay will be re-examined in accordance with 3(c)5.
If the flaw is not acceptable for continued service per IWB-3640, then it shall be repaired.
APS agrees to this change because the evaluation allowed by IWB-3640 is for flaws exceeding the acceptance standards of IWB-3514.1, "Allowable Planar Flaws," which does not include flaws caused by Primary Water Stress Corrosion Cracking (PWSCC).
A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway 0 Comanche Peak 0 Diablo Canyon & Palo Verde 0 South Texas Project
- Wolf Creek
ý4 gLi
I NRC Document Control Desk Supplement to Inservice Inspection Relief Request No. 36 Page 2 This letter does not make any commitments to the NRC. If you have any questions, please contact Glenn Michael at (623) 393-5750.
Sincerely, S 2C. 72ý/zý DCM/TNW/GAM/gat cc:
B. S. Mallett M. T. Markley G. G. Wamick NRC Region IV Regional Administrator NRC NRR Project Manager NRC Senior Resident Inspector for PVNGS