ML20244D203

Forwards Suppl 1 to Proprietary WCAP-12151 & Nonproprietary WCAP-12152, Addl Info in Support of Assessment of Thermal Stratification for Seabrook Unit 1 Pressurizer Surge Line. Westinghouse Authorization Ltr Also Encl

ML20244D203
Person / Time
Site:	Seabrook
Issue date:	04/10/1989
From:	George Thomas PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML19297H576	List: ML20244D203 ML20244D209 ML20245B875
References
IEB-88-011, IEB-88-11, NYN-89037, NUDOCS 8904210206
Download: ML20244D203 (3)

Text

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l George S. Thomas New.Hampsh.ire wc.m. n,.neci.o,m _ on Yankee '

NYN 89037 April 10, 1989 United' States Nuclear Regulatory Commission Washington, DC 20555 Attention: Document Control Desk

References:

(a) Facility Operating License NPF-56, Docket No. 50-443 (b) NRC Bulletin No. 88-11 dated December 20, 1988, I

" Pressurizer Surge Line Thermal Stratification" (c) PSNH Letter NYN-89023 dated March 7, 1989, " Response to NRC Bulletin 88-11: Pressurizer Surge Line Thermal Stratification," G. S. Thomas to USNRC

Subject:

Response to NRC Balletin 88-11: Pressurizer Surge Line Thermal Stratification Gentlemen Reference (c) provided a copy of a proprietary report (Westinghouse WCAP-12151) as a portion of the New Hampshire Yankee (NHY) response to NRC Bulletin 88-11. WCAP-12151 presented the results of a study of the effects of thermal stratification in the Seabrook Station pressurizer surge line (PSL).

On March 27, 1989, representatives of New Hampshire Yankee and Westinghouse discussed WCAP-12151 with the NRC Staff. During this discussion, the Staff requested additional information regarding the comparison of the Seabrook surge line to the surge lines of other plants for which plant-specific analyses have been performed.

To facilitate the Staff's review of this issue, enclosed is Supplement 1 to WCAP-12151, " Additional Information in Support of the Assessment of Thermal g Stratification for the Seabrook Unit 1 Pressurizer Surge Line" [ Enclosure 1].

This Supplement provides additional information comparing surge line n transients, piping layout, secondary stress evaluation and fatigue life to o those aspects of several other plants for which Westinghouse has completed g@Q. c plant-specific analyses. Enclosure 2, WCAP-12152 Supplement 1, " Additional oo Information in Support of the Assessment of Thermal Stratification for the

$ Seabrook Unit 1 Pressurizer Surge Line," is the non-proprietary version of this same report.

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$@ New Hampshire Yonkee Division of Public Service Company of New Hampshire P.O. Box 300

• Seabrook, NH 03874

• Telephone (603) 474-9521

United States Nuclear Regulatory Commission April 10, 1989 Attention: Document Control Desk Page 2 Westinghouse authorization letter, CAW-89-053, Proprietary Information Notice, and accompanying Affidavit are provided in Enclosure 3.

As Westinghouse Report WCAP-12151 Supplement 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 g with 10 CFR Section 2.790 of the Commission's regulations. i Correspondence with respect to the proprietary aspects of Application for Withholding or the supporting Westinghouse Affidavit should reference CAW 053 and should be addressed to R. A. Wiesemann, Manager of Regulatory &

Legislative Affairs Westinghouse Electric Corporation, P.O. Box 355, I Pittsburgh, Pennsylvania 15230-0355.

I Should you have any further questions regarding this matter, please j contact Mr. Geoffrey Kingston at (603) 474-9521, extension 3371. '

Very truly yours, ych nw George S. Thomas Enclosure cci Mr. William T. Russell Regional Administrator United States Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia, PA 19406 Mr. Victor Nernes, Project Manager l Project Directorate I-3 United States Nuclear Regulatory Commission Division of Reactor Projects Washington, DC 20555 Mr. David G. Ruscitto NRC Senior Resident Inspector ,

P.O. Box 1149 l Seabrook, NH 03874 l 1

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Enclosure 3 to NYN-89037 WESTINGHOUSE LETTER NO. CAW-89-053 PROPRIETARY INFORMATION NOTICE, AFFIDAVIT CAW-88-129

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