ML20116A231

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Requests Approval to Use ASME Code Case N-413, Min Size of Fillet Welds for Linear Type Supports,Section Iii. Use of Fillet Welds Smaller than Sizes Listed in Subsection Nf, Table NF-3324.5(d)-1 Allowed
ML20116A231
Person / Time
Site: Clinton Constellation icon.png
Issue date: 04/03/1985
From: Spangenberg F
ILLINOIS POWER CO.
To: Schwencer A
Office of Nuclear Reactor Regulation
References
U-0829, U-829, NUDOCS 8504240414
Download: ML20116A231 (2)


Text

1 4 '1- l U- 0829 L31-85 (04-03)-L 1A.120 ILLIN0/S POWER 00MPANY f JP ;

CLINTCN POWER STATION, P.O. BOX 678. CLINTON. ILLINOIS 61727 April 3, 1985 Docket No. 50-461 Director of Nuclear Reactor Regulation Attention: Mr. A. Schwencer, Chief Licensing Branch No. 2 U.S. Nuclear Regulatory Commission Washington, DC 20555

Subject:

Clinton Power Station Unit 1 Application for ASME Code Case N-413

Dear Mr. Schwencer:

Illinois Power Company intends to make use of ASME Code Case N-413

" Minimum Size of Fillet Welds for Linear Type Supports,Section III, Division 1, Subsection NF." This Code Case allows for the use of fillet welds smaller than the sizes listed in Subsection NF, Table NF-3324.5 (d)-1, provided that the weld is designed to meet the allowable limits and the veld size is specified on the design drawings.

We request NRC approval for use of ASME Code Case N-413 (attached) at the Clinton Power Station.

Please advise as soon as possible if you have any questions on our request to use this Code Case.

Sincer yours

c. . p F.A./ Span nber Director-Nuclear Licensing and Configuration DAP/ lab Attachment cc: B. L. Siegel, NRC Clinton Licensing Project Manager NRC Resident Office Regional Administrator, Region III, USNRC g Illinois Department of Nuclear Safety \

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Annex: 84-616 MC 84-480 N84-043 Case N-413 Minimum Size of Fillet Welds for Linear Type SupportsSection III, Division 1, Subsection NF Inquiry May the fillet or partial penetration weld sizes specified in design documents be less than those specified in Subsection NF, Table NF-3324.5(d), and Appendix XVII, Table XVII-2452.1-1 provided the stress limits are not exceeded?

Reply It is the opinion of the Committee that, until the referenced tables are removed from the code, fillet and partial penetra-tion weld sizes smaller than the sizes listed in Subsection NF, Table NF-3324.5(d)-1, and Appendix XVII, Table XVII-2452.1-1 are permitted, provided that, when considering the limiting design or service loadings of the Design Specification, the allowable limits of Table NF-3324.5(a)(1) are met, and the weld size is specified on the design drawings.

This Code Case number shall be listed on the documentation for the support.

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