ML20133A674
| ML20133A674 | |
| Person / Time | |
|---|---|
| Site: | Byron, Braidwood  |
| Issue date: | 12/20/1996 |
| From: | Hosmer J COMMONWEALTH EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9701020036 | |
| Download: ML20133A674 (1) | |
Text
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Commonweal 1 Iklium Company 1400 Opus Place
' Downers Grove,IL COSI5-5701 1
December 20,1996 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555
Subject:
Use of ASME Section IX Code Cases 2142 1 and 2143-1 Byron and Braidwood Nuclear Power Stations Unit 1 NRC Docket Numbers:50-454 and 456 The Commonwealth Edison Company (Comed) requests approval in accordan.e with 10CFR50.55a(a)(3) to use the alternative rules of American Society of Mechanical Enginects (ASME)Section IX Code Cases 2142 1 and 2143-1 in lieu of the requirements of 10CFR50.55a(c) for the purpose of v elding procedure and performance qualification.
The use of Nickel-Chromium-Iron (Ni-Cr-Fe) weld filler materiaia most like Alloy 690 in composition is necessary in the fabrication and installation of the Byron and Braidwood Unit I replacement steam generations. Specific materials desired for this application are UNS W86152, matching Shielded Metal Arc Welding (SMAW) electrode for Alloy 690 and UNS N06052, the companion bare filler metal. These materials were originally approved by ASME through Code Cases 2142.ad 2143; no substantive changes occurred between Code Cases 2142 and 2142-1, and 2143 and 2143 1. The materials are classified as F-No.43 for weld procedure and performance qualification.
EPRI studies have shown the materials to have superior corrosion resistance when compared to Alloy 600 '
used in the existing steam generators. UNS W86152 and UNS N06052 weld materials are preferred for welding applications invohing Alloy 690 in order to match the corrosion resistance of the Alloy 690 base l
metal. The materials provide an acceptable level of quality and safety because of their superior corrosion resistant properties; therefore, the requirements of 10CFR50.55a(a)(3)(i) are satisfied. Further, using Code Cases 2142-1 and 2143-1 permits the use of a large number of existing welding procedures and performance qualifications, eliminating the burden of separate welding procedures for non-code welding materials; therefore, the requirements of 10CFR50.55a(a)(3)(ii) are satisfied.
Comed requests approval of the use of Code Cases 21421 and 2143-1 by May 15,1997. If you have any l
questions concerning this correspondence please contact Denise Saccomando, Senior PWR Licensing Administrator at 630-663-7283.
Sincerely, i
f - 8 Jkm John B. Hosmer i
l Engineering Vice President cc:
A.B. Beach, Regional Administrator - Rlll
/
R. Assa, Braidwood Project Manger-NRR gL 0
G. Dick, Byron Project Manager-NRR j
C. Phillips, Senior Resident inspector-Braidwood S. Burgess, Senior Resident inspector-Byron j
Office of Nuclear Safety-IDNS l
9701020M 6 96i220
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