ML20090K662

Forwards Proprietary & Nonproprietary WCAP 10551, Technical Bases for Eliminating Large Primary Loop Pipe Rupture as Structural Design Basis for Aw Vogtle Units 1 & 2. Proprietary Version Withheld (Ref 10CFR2.790)

ML20090K662
Person / Time
Site:	Vogtle
Issue date:	05/17/1984
From:	Foster D GEORGIA POWER CO.
To:	Adensam E, Harold Denton Office of Nuclear Reactor Regulation
Shared Package
ML19269A161	List: ML20090K662 ML20090K666 ML20090K673
References
GN-359, NUDOCS 8405240310
Download: ML20090K662 (2)

Text

P Geo gta Poner Company 333 Piedmod Avenue Atlama. Georgia 30308 Telephone 404 526 772G Ma+ng Address.

Post Office Box 4545 Atbnta. Georga 30302 h Georgia Power D. O. Foster the southem entic sys.'em Vice President and General Manager Vogtie Project

,May 17, 1984 Director of Nuclear Reactor Regulation File: X7N0.06 Attention: Ms. Elinor G. Adensam, Chief Log: GN-359 Licensing Branch #4 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C. 20555 REFERENCE (a): GPC Letter, dated 10/25/83, Foster to Denton (b): NRC letter to GPC dated 3/19/84, Adensam to Foster NRC DOCKET NUMBERS 50-424 AND 50-425 CONSTRUCTION PERMIT NUMBERS CPPR-108 AND CPPR-109 V0GTLE ELECTRIC GENERATING PLANT - UNITS 1 AND 2 ALTERNATE PIPE BREAK DESIGN CONSIDERATIONS

Dear Mr. Denton:

The Reference (a) letter informed the NRC that Georgia Power Company was evaluating the technical feasibility and potential benefits of eliminating postulated pipe breaks in the RCS primary loop from the structural design basis of the Vogtle Units 1 and 2. As part of that letter, Westinghouse reports MT-SME-3082, " Technical Bases for Eliminating Large Primary Loop Pipe Ruptures as the Structural Design Basis for Vogtle Units 1 and 2,"

November 1983, Westinghouse Proprietary, were enclosed. These reports provided the type of information requested by the Staff for NRC review of the technical bases for elimination of RCS primary loop breaks.

The Reference (b) NRC letter indicated that the NRC Staff had reviewed, (1) the leak-before-break analysis provided by the Reference (a) letter, yg and (2) the generic Westinghouse report WCAP-10456 dealing with fracture go. toughness of piping materials under thermal aging conditions. As a result oo of that review, the Materials Engineering Branch requested additional y information to complete their evaluation on the subject matter.

o.g At a meeting held March 22, 1984, with representatives of the NRC Staff /

@ Texas Utilities / Westinghouse, the responses to the Staff requests for W3 additional information were discussed. At that meeting, the Staff outlined 7 the type of additional information required by the NRC. The technical

$$ information requested is enclosed as follows:

to a.<i:

1. Twenty-five (25) copies of Westinghouse Report WCAP-10551, " Technical Bases for Eliminating Large Primary Loop Pipe Rupture as the Structural Design Basis for Alvin W. Vogtle Units 1 and 2," April 1984, Westing-W4 WW NOW ,) '

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Director of Nuclear Reactor Regulation File: X7NO.06 May 17, 1984 Log: GN-359 Page 2 t Li, '

2. Twenty-five (25)' copies of' Westinghouse Report WCAP-10552, " Technical l- Bases for Eliminating Large' Primary. Loop Pipe Rupture as the Structural i ' ,Decign Bases for Alvin W. Vogtle Units 1 and 2," April 1984, Non-Proprietary. s s

' Also enclosed is one (1) Application for Withholding, CAW-84-43.

< WCAP-10551 is a new report (Proprietary and Non-Proprietary versions as appropriate) prepared specifically for the Vogtle Units 1 and 2. This new d' report incocporates the previous material in Westinghouse report MT-SME-

s. 3082 along with the additional infotmation addressing MEB Items 123.8, 123.9, 123.10,' and 123.11. For Item 123.12, an assessment of margins considering the loads, flaw size, and material toughness for the Vogtle (Units 1 and,2 RCS piping material'is also included. Results covering V.he elastic-plastic fracture mechanics analysis of the 4-inch thermally aged pipe in WCAP-10456 is expected to be completed in June 1984 and G s will be transmitted at that time.-

l As Enclosure 1 contains information proprietary to Westinghouse Electric Corporation, it is supported by an affidavit signed by Westinghouse, the owner of the information. The affidavit sets forth the basis on which the information may be withheld from public disclosure by the Commission and addresses with specificity the considerations listed in paragraph (b)(4) of Section 2.790 of the Commission's regulations.

Accordingly, it is respectfully reque'sted that the information which is proprietary to Westinghouse be withheld from public disclosure in

'. accordance with 10 CFR Section 2.790 of the Commission's regulations.

~

Correspondence with respect to the proprietary aspects of the Application for Withholding or.the anpporting Westinghouse affidavits should reference CAW-84-43, and should be addressed to R. A. Wiesemann, Manager, Regulatory s

, and Legislative ~ Affairs, Westinghouse Electric Corporation, P.O. Box 355, Pittsburgh, PennsylvEnia Q.5230.

G'N If you have any questions concerning the enclosed information, do not hesitate to' contact us.

.\

., Yours truly j D. O. Foster DOF/KWK/sw Enclosure g xc: M. A. Miller

, R. A. Thomas

, J. A. Bailey ' i O. Batum ' t s

, 'c L. T. Gucwa.

G.sP. Trowbridge, Esquire ,

'G.}Bockholdj Jr. I s D.

i G. Eisentut ,

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