ML082820363: Difference between revisions

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{{Adams
#REDIRECT [[NL-08-1560, Response to Request for Additional Information Request for Structural Overlay]]
| number = ML082820363
| issue date = 10/08/2008
| title = Response to Request for Additional Information Request for Structural Overlay
| author name = Ajluni M J
| author affiliation = Southern Nuclear Operating Co, Inc
| addressee name =
| addressee affiliation = NRC/Document Control Desk, NRC/NRR
| docket = 05000321, 05000366
| license number =
| contact person =
| case reference number = NL-08-1560
| document type = Letter
| page count = 4
}}
 
=Text=
{{#Wiki_filter:Southern Nuclear Operating Company. Inc. Post Office Box 1295 Birmingham.
Alabama 35201-1295 Tel 205.992.5000 October 8, 2008 SOUTHERN'\
COMPANY Energy to Serve Your WorldS" Docket Nos.: 50-321 50-366 NL-08-1560 U. S. Nuclear RegUlatory Commission ATrN: Document Control Desk Washington, D. C. 20555-0001 Edwin I. Hatch Nuclear Plant -Units 1 and 2 Request for Additional Information Request for Structural Overlay Ladies and Gentlemen:
Bya facsimile dated September 2, 2008 Southern Nuclear Operating Company (SNC) received an NRC Request for Additional Information (RAI) concerning structural weld overlays on Plant Hatch Units 1 and 2. . The SNC response to the NRC RAI is provided in Enclosure
: 1. This letter contains no NRC commitments.
If you have any questions, please contact Ray Baker at 205-992-7367.
Sincerely, M. J. Ajluni Manager, Nuclear Licensing MJAlPAH/daj
 
==Enclosure:==
Edwin I. Hatch Nuclear Plant Units 1 and 2 Docket Nos. 50-321 and 50-366 Request for Additional Information Request for Structural Overlay U. S. Nuclear Regulatory Commission NL-08-1560
 
Page 2 cc: Southern Nuclear Operating Company Mr. J. T. Gasser, Executive Vice President  Mr. D. R. Madison, Vice President - Hatch  Mr. D. H. Jones, Vice President - Engineering RTYPE:  CHA02.004
 
U. S. Nuclear Regulatory Commission Mr. L. A. Reyes, Regional Administrator  Mr. R. E. Martin, NRR Project Manager - Hatch Mr. J. A. Hickey, Senior Resident Inspector - Hatch
 
Edwin I. Hatch Nuclear Plant - Units 1 and 2 Docket Nos. 50-321 and 50-366 Request for Additional Information Request for Structural Overlay Enclosure 1
 
Edwin I. Hatch Nuclear Plant Units 1 and 2  Docket Nos. 50-321 and 50-366 Request for Additional Information Request for Structural Overlay E1 - 1 The Nuclear Regulatory Commission (NRC) staff has reviewed the Southern Nuclear Operating Company (SNC, the licensee) request dated June 11, 2008, for application of a dissimilar metal weld full structural overlays at the Edwin I. Hatch Plant, Units 1 and 2, and has determined that additional information is necessary to complete the review of the request for relief. Based on the staff's review, please provide a response which addresses the following request for additional information (RAI) question. 
 
NRC Question Question:  The first paragraph of the Enclosure on page 4 of 38 states, "When components subject to being overlaid contain levels of trace chemicals (e.g., sulfur) that could cause unacceptable indications in the Alloy 52/152 weld, an initial layer of low carbon (0.035% max.) austenitic stainless steel and/or an austenitic nickel alloy may be applied as a buffer between the base metal and the
 
Alloy 52/152 overlay."  Austenitic stainless steel filler metals cannot be used to weld on high nickel alloys due to the potential for cracking. How does the licensee intend on avoiding this cracking.
 
SNC Response Response:  This paragraph is revised to read. "When stainless steel components subject to being overlaid contain levels of trace chemicals (e.g., sulfur) that would likely cause unacceptable indications in the Alloy 52/152 weld, an initial layer of low carbon (0.035% max.) austenitic stainless steel alloy may be applied to the stainless steel base metal as a buffer between the base metal and the Alloy 52/152 overlay. The intersection between the stainless steel component and the high nickel alloy will be determined and controls will be in place to prohibit the deposition of austenitic stainless steel filler metal on high nickel alloys. 
 
Additionally, austenitic nickel alloy may be used to complete all or portions of the first non-credited layer to facilitate the installation of the subsequent credited layers."}}

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