ML20246E789

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Forwards Nonproprietary & Proprietary WCAPs 12259 & 12258, Evaluation of Thermal Stratification for Comanche Peak Unit 1 RHR Lines. Proprietary Rept Withheld (Ref 10CFR2.790)
ML20246E789
Person / Time
Site: Comanche Peak Luminant icon.png
Issue date: 05/09/1989
From: William Cahill
TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML19302D819 List:
References
TXX-89246, NUDOCS 8905120023
Download: ML20246E789 (2)


Text

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Log # TXX-89246

{ - File # 903.6 Ref. # 10CFR2.790 1UELECTRIC 1 May 9, 1989 i

W.J.Cahm I Execuswe Vice President l

U. S. Nuclear Regulatory Commission l Attn: Document Control Desk Washington, D. C. 20555 j

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET N0. 50-445 ANALYSES OF THERMAL STRESSES AND LEAK-BEFORE-BREAK QUllLIFICATION FOR THE RESIDUAL HEAT REMOVAL LINES REF: TU Electric Letter (TXX '89228) from William J. Cahill, Jr.

to the NRC dated May 1, 1989 f Gentlemen:

The above reference responded to Action 2a of NRC Bulletin 88-11, " Pressurizer Surge Line Thermal Stratification" and provided analyses in support of leak-before-break qualification for the CPSES Unit 1 Pressurizer Surge Line. In addition, TV Electric indicated that the issue of potential thermal stratification effects and leak-before-break qualification for the CPSES Unit 1 Residual Heat Removal (RHR) suction lines would be submitted by May 9, 1989. TV Electric has completed analyses of the potential effects of thermal stratification on the CPSES Unit 1 RHR suction lines. The analyses show that thermal stratification will not affect the integrity of the RHR l suction lines or the ability to satisfy leak-before-break criteria. These

, analyses encompass the phenomena described in NRC Bulletin 88-08 Supplement 3, l " Thermal Stresses In Piping Connected To Reactor Coolant Systems."

l l Additional analyses were performed to address NRC concerns that the RHR suction lines are acceptable candidates for application of leak-before-break methodology. This letter provides the analyses in the enclosed documents.

The first enclosure consists of fiu. (5) copies of Wt.aP-12258, entitled

" Evaluation of Thermal Stratification for the Comanche Peak Unit 1 Residual Heat Removal Lines" (Proprietary) .

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i TXX-89246 I i

May 9, 1989 l

Page 2 of 2 )

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The second enclosure consists of five (5) copies of WCAP-12259, entitled j

" Evaluation of Thermal Stratification for the Comanche Peak Unit 1 Residual Heat Removal Lines" (Non-Proprietary) .

The third enclosure consists of a Westinghouse Application for Withholding, CAW-89-064, Accompanying Affidavit, CAW-88-129, and Proprietary Information Notice.

This submittal 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 j addresses with specificity the considerations listed in paragraph (b)(4) of i 10CFR2.790.  !

Accordingly, it is respectfully requested that the information which is '

proprietary to Westinghouse be withheld from public disclosure in accordance

, with 10CFR2.790. Correspondence with respect to the proprietary aspects of the Application for Withholding should reference CAW-89-064 or the supporting Westinghouse affidavit, CAW-88-129, and be addressed to R. A. Wiesemann, Manager Regulatory and Legislative Affairs, Westinghouse Electric Corporation, P.O. Box 355, Pittsburgh, Pennsylvania 15230.

Sincerely, 1

i l

William J. C hill, Jr.

rGb By:.D. R. Woodlan Docket Licensing Manager HAM /vid Enclosures c - Mr. R. D. Martin, Region IV w/o encl Resident inspectors, (CPSES) (3) w/o encl l \

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