ML20248C699
| ML20248C699 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 05/22/1998 |
| From: | Dennis Morey SOUTHERN NUCLEAR OPERATING CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9806020227 | |
| Download: ML20248C699 (2) | |
Text
,,
. Dave M:r:y -
Southern Nuclear
. Vice Presdent
. Operating Company -
Farley Project,
. P.O. Box 1295 i.
. Birmingham, Alabama 35201 l
. Tel 205.992.5131 l
SOUTHE.RN May 22, 1998 c
Energyto Serve YourWorld*
Docket Nos.: 50-348 '
10 CFR 50.55a(s)(3) 50-364
. U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington,DC' 20555 Joseph M. Farley Nuclear Plant Request Approval To Use ASME Code Cases 2142-1 and 2143-1 For Steam Generator Replacement Ladies and Gentlemen-
' In accordance with the provisions of 10 CFR 50.55a(a)(3), Southern Nuclear Operating
- Company requests approval to use American Society ofMechanical Engineers (ASME)
Section IX Code Cases 2142-1 and 2143-1 *n the fabrication and installation of the Farley Nuclear Plant Units I and 2 replacement steam generators. These Code Cases were -
approved by ASME on June 5,1995, and published in the 1995 Edition of the ASME Boiler and Pressure Vessel Code, Code Cases Supplement No.1. However, since the 1995 Edition
. of the ASME Code has not been incorporated by reference into the regulations, these Code
- Cases cannot be used without prior NRC approval.
These Code Cases provide requirements for classifying nickel base weld metals that closely match and are intended for welding Alloy 690. Code Case 2142-1 establishes a welding classification and other requirements for a bare wire weld filler metal. Code Case 2143-1 establishes a welding classification and other requirements for a coated weld electrode.
These Code Cases establish these welding materials as F-No. 43, based essentially on their L usability characteristics. This' designation categorizes the welding characteristics of these welding materials to be similar to many other Code-approved nickel based weld metals. The F-No. 43 designation eliminates the burden of requiring qualification of separate welding
- procedures for each weld metal, as is the case for non-Code approved welding materials.
l The current base me<al_of choice for replacement steam generator components in primary-l-
side wetted surfaces is' Alloy 690! The; welding materials described by these Code Cases are
- the pmferred choice for welding applicationiinvolving Alloy 690 that will be in a corrosive environment.L Code Cases 2142 and 2143 were approved by the NRC on a case-by-case basis in 1993 and have been used in the fabrication and installation of many replacement steam generators. The use of these weld materials for non-structural welds will increase 0
,~
[I
- (
U.S. Nuclear Regulatory Commission Page 2 '
the service life of the replacement steam generators and will provide an acceptable level of quality and safety because of their superior corrosion resistant properties.
. Review of these Code Cases by the NRC staff for McGuire Nuclear Station Units I and 2 (Docket No. 50-359 and 50-370) and Catawba Nuclear Station Unit 1 (Docket No. 50-413) was documented ir. NRC letter dated July 20,1993. The review for North Anna Power Station Unit 2 (Docket No. 50-339) was documented in NRC letter dated October 28,1994.
Southern Nuclear Operating Company requests approval for use of Code Cases 2142-1 and 2143-1 by January 1,1999.
If there are any questions, please advise.
Respectfully submitted, SOUTHERN NUCLEAR OPERATING COMPANY Dave Morey MWD / CHM / cit:SG98121. doc l-cc: Mr. L. A. Reyes, Region II Administrator Mr. J. I. Zimmerman, NRR Project Manager Mr. T. M. Ross, Plant Sr. Resident Inspector
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _