ML20005E822

Forwards Proprietary Suppl 1 to WCAP-12218 & Nonproprietary Suppl 1 to WCAP-12219, Supplementary Analysis to Address Thermal Stratification for Vogtle Unit 1 Pressurizer Surge Line, Per NRC Bulletin 88-011.Proprietary Rept Withheld

ML20005E822
Person / Time
Site:	Vogtle
Issue date:	01/04/1990
From:	Hairston W GEORGIA POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML19310C599	List: ML20005E822 ML20005E825 ML20005E826
References
ELV-01196, ELV-1196, IEB-88-011, IEB-88-11, NUDOCS 9001110125
Download: ML20005E822 (3)

Text

Geor0:n Power Comrany

'* e. . - 333 Piedmont Aenue

~. Atlan'a Georg a 30308 4 lelephone 404 sPG 3195 ,

Maang Address  ;

40 Irwemess centor Pa*way Post Omce Box 1295 j Ditmingham, Alatema 35201 -

f Telephone 205148 s501 Irv uuttem ekwc system W. G. Hatraton, til i semor vee Premiaen ELV-01196 Nudear Operatons 0183 )

! ) i L Docket No. 50-424 J 1 i U. -S. Nuclear Regulatory Commission  ;

ATTN: Document Control Desk i F

Washington, D. C. 20555 )

l- j Gentlemen:  !

V0GTLE ELECTRIC GENERATING PLANT EVALUATION OF PRESSURIZER SURGE LINE  !

M RMAL STRATIFICATION w;

~

On December 20, 1988, the NRC issued Bulletin 88-11 regarding pressurizer surge line thermal stratification. The bulletin requested that utilities implement a  :

program to confirm the integrity of the pressurizer surge lino considering the  !

effects of thermal stratification. In response to the bulletin, the surge line (  !

supports for VEGP Unit 2 were modified based on the application of  ;

leak-before-break methodology, which had previously been accepted for the Unit 2 .

lnressurizersurgeline.

ine was analyzed for the Witheffects this modification, the Unit 2 pressurizer of thermal stratification and found tosurge be '

acceptable. The results of these analyses were documented in WCAP-12218 and i transmitted to the NRC by Georgia Power Company (GPC) letter GN-1585 dated March  :

22, 1989.-

VEGP Unit I was operating at the time that this analysis and modification was l performed for VEGP Unit 2. A Justification for Continued Operation was prepared j for VEGP Unit I demonstrating the acceptability of continued power operation  :

through at least December 1990 or until a detailed plant specific analysis could  ;

be performed. Except for operating history, the two units are identical ,

relative to the primary factors which affect thermal stratification transients. I Therefore, in order to keep a consistent design and licensing basis for the two i units GPC decided to use the same type of analysis for Unit I as was used for i

,F Unit 2. The fatigue crack growth and leak-before-break analyses for Unit 2 l have been updated consistent with the loading conditions, operating history, and material properties of Unit I such that the application of leak-before-break can

.L. be extended to Unit 1. These additional plant specific analyses are documented  ;

g. in WCAP-12218 Supplement 1. j

-8 The analyses have determined that thermal stratification does not have a 1

88 j So significant impact on the integrity of tne phssurizer surge line for Vogtle nw Unit 1.. This conclusion applies for the forty' year design life of the unit, om considtring both the period of operation with th'e existing support configuration as well as the forthcoming support modification to emulate the Unit 2 design.

1 7 These Unit 1 analyses assume that there will be only one rigid support on the c surge line after the 1990 refueling outage and that the maximum system delta-T L g& will be 320 deg-F.

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Georgia Power abL '

U. S. Nuclear Regulatory Commission ELV-01196 Pace Two Due to the similarity of the design and analyses for Units 1 and 2 and the NRC's previous review and approval of the analysis for Unit 2, GPC requests that the

, NRC expedite the review of Supplement 1 to WCAP-12218 and extend its previous approval for Unit 2 to include Unit 1. Approval by February 23, 1990, will enable GPC to implement the modification to the Unit 1 pressurizer surge line supports during the February 1990 refueling outage.

In fulfillment of the actions requested by Section Ib of Bulletin 88-11, the following are provided:

1. 5 copies of WCAP-12218, Supplement 1 Supplementary Analysis to Address Thermal Stratification for Vogtle Unit 1 Pressurizer Surge Line", dated December 1989 (Proprietary).

2. 5 copies of WCAP-12219, Supplement 1 " Supplementary Analysis to Address Thermal Stratification for Vogtle Unit 1 Pressurizer Surge Line", dated December 1989 (Non-Proprietary).

Also enclosed is a Westinghouse Application for Withholding letter, CAW-89-123, '

Proprietary Information Notice, and accompanying Affidavit.

As itein 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 requested 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 Witholding or the supporting Westinghouse Affidavit should reference CAW-89-123 and should be addressed to R. A. Wiesemann, Manager of Regulatory & Legislative Affairs, Westinghouse Electric Corporation, P. O. Box 355, Pittsburgh, Pennsylvania 15230-0355.

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Georgia Power d -

O. S. Nuclear Regulatory Commission ELV-01196 >

Paae Three l Mr. W. G. Hairston, III states that he is a Senior Vice President of Georgia c Power Company and is authorized to execute this oath on behalf of Georgia Power Company and that, to the best of his knowledge and belief, the facts set forth in this letter and enclosures are true.

l GEORGIA POWER COMPANY

By: /M +/

• W. G. Hairston, 111 Sworn to and subscribed before me this M of b4,f un 414 , 1990.

! O f t , o 4 du .d/

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Notary l)Public

.NY COMM:SSION EXPlRES DEC.15.1992 WGH.III/HWM/gm Enclosures xc: Georaia Power Company Mr. C. K. McCoy Mr. G. Bockhold, Jr.

Mr. P. D. Rushton Mr. R. M. Odom NORMS U. S. Nuclear Reaulatory Commission '

Mr. S. D. Ebneter, Regional Administrator Mr. J. B. Hopkins, Licensing Project Manager, NRR Mr. J. F. Rogge, Senior Resident Inspector, Vogtle l

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