ML071590109: Difference between revisions

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{{Adams
#REDIRECT [[NOC-AE-07002170, Finite Element Analysis Status for Pressurizer Butt Welds]]
| number = ML071590109
| issue date = 05/30/2007
| title = Project, Units 1 & 2 - Finite Element Analysis Status for Pressurizer Butt Welds
| author name = Rencurrel D W
| author affiliation = South Texas Project Nuclear Operating Co
| addressee name =
| addressee affiliation = NRC/Document Control Desk, NRC/NRR
| docket = 05000498, 05000499
| license number =
| contact person =
| case reference number = NOC-AE-07002170, STI: 32166310
| document type = Letter
| page count = 3
}}
 
=Text=
{{#Wiki_filter:Nuclear Operating Company South Texas Pro/ed Eledric Generatlng StatIon PO. Box 289 Wadsworth, Texas 77483 -May 30, 2007 NOC-AE-07002170 10CFR50.55a U. S. Nuclear Regulatory Commission Attention:
Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852-2738 South Texas Project Units 1 and 2 Docket No. STN 50-498, STN 50-499 Finite Element Analysis Status for Pressurizer Butt Welds  
 
==Reference:==
 
Letter, David W. Rencurrel to Document Control Desk, "Inspection and Mitigation of Alloy 82/182 Pressurizer Butt Welds -Revised," dated February 22, 2007 (NOC-AE-07002120, ML070600123)
As described in the referenced correspondence regarding inspection and mitigation of Alloy 82/182 pressurizer butt welds, additional refined crack growth calculations of the limiting pressurizer nozzle Alloy 82/182 weld configuration are being developed using three-dimensional finite element analysis.
Modeling a changing crack shape, rather than a semi-elliptical flaw shape, is expected to result in a significant increase in the estimated time between through-wall penetration and rupture for the limiting case nozzle. STP Nuclear Operating Company (STPNOC) committed to provide a status of the analysis by May 31, 2007.The analysis is on track for completion by the end of June 2007, with expected submittal of a final report by NEI in late July 2007. The analysis has incorporated input from the NRC staff.STPNOC expects that the results will support continued operation of STP Unit 1 until its spring 2008 refueling outage.1 However, as committed in the referenced correspondence, STPNOC will adopt contingency plans to shut down Unit 1 by December 31, 2007, if technical information being developed through this advanced finite element analysis does not provide reasonable assurance to the NRC that pressurized water stress corrosion cracking (PWSCC)conditions will remain stable and not lead to rupture without significant time from the onset of detectable leakage.'STPNOC requires the analysis results for application to Unit 1 only since weld overlay mitigation was performed on the STP Unit 2pressurizer nozzles in spring 2007.STI: 32166310 NOC-AE-07002170 Page 2 of 3 STPNOC staff is available to meet with the NRC to discuss any of the information in this letter.If there are any questions, please contact either Mr. Philip L. Walker at (361) 972-8392 or me at (361) 972-7867.There are no new commitments in this letter.Vice President, Engineering and Alliances awh NOC-AE-07002170 Page 3 of 3 cc: (paper copy)(electronic copy)Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, Texas 76011-8064 Senior Resident Inspector U. S. Nuclear Regulatory Commission P. O. Box 289, Mail Code: MN116 Wadsworth, TX 77483 C. M. Canady City of Austin Electric Utility Department 721 Barton Springs Road Austin, TX 78704 Richard A. Ratliff Bureau of Radiation Control Texas Department of State Health Services 1100 West 49th Street Austin, TX 78756-3189 A. H. Gutterman, Esquire Morgan, Lewis & Bockius LLP Mohan C. Thadani U. S. Nuclear Regulatory Commission Thad Hill Eddy Daniels Marty Ryan Harry Holloway Steve Winn NRG South Texas LP Ed Alarcon J. J. Nesrsta R. K. Temple Kevin Pollo City Public Service Jon C. Wood Cox Smith Matthews C. Kirksey City of Austin}}

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