ML20094M477

Forwards RHR Line Summary Rept, Containing Supplemental Evaluation of RHR Line Thermal Stratification & leak-before- Break Qualification.Rhr Line Monitored & Data Collected During First Operating Cycle

ML20094M477
Person / Time
Site:	Comanche Peak
Issue date:	03/23/1992
From:	William Cahill, John Marshall TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20094M479	List: ML20094M477 TXX-9200, RHR Line Summary Rept
References
TXX-92009, NUDOCS 9204010006
Download: ML20094M477 (2)

Text

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Ref. # 10CFR2.790 TUEi EC TRIC NRc6 88 08

llliam J. Cahill, jf.

Grvup VicePrni.M t UOMh 23, 1992 U. S. Nuclear Regulatory Commission Atto: Document Eontrol Dest Wushingcon, D. E 20555

SUBJECT:

COMANEHE PEAV STEAM ELECTRIC STATION (CPSES) - UNIT 1 DOCKE1 NO. 50-445 SUPPLrMEllTAL EVALUAT10ft 0F RESIDUAL HEAT REMOVAL (RHR)

LitlES THERMAL STRATIFICAT10:1 AND LEAK-BEFORE-BREAK (LBB)

GUsLirICAT10ti REF: 1) TU Liectric letter logged TXX-89246, from William J. Cahill, Jr. to NRC dated May 9. 1989

2) I'U El ect r ic l et t er logqed TXX-89566, from William J. Cahill, Jr. to NRC Jated August 9, 1989

3) TV Electric letter logged TXX-89710, from William J. Cahill, Jr. tu NRC dated September 18, 1989 Gentlemen:

On May 9,1989. TU Elect ric submitt ed by Refercnce (1) en evaluation of potential thermal stratification effects and leak before-break qualification for the Comanche Peak Unit 1 RHR piping. TU Electric subse.juently submitted a supplemental evaluation by Ref erence (2), to address NRC concerns, which demonstrated that RHR piping integrity will be maintained during plant operation and that the leak-before-break criteria are satisfied.

Reference (2) also providea an overview of the RHR monitoring program and administratice controls that ensure issues arising from the monitorir,g program are addressed in a timely manner Reference (3) provides a response to concerns pertaining to the timeliness of reporting kHR thermal cycling; sensitivity of monitoring equipment, and the type cf welding performed at LBB evaluated critical crack locations discussed durina a telephone conf erence on Septemtier 6, 1 :M 9.

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The RHR line has been monitored and data has been collected during the first operating cycle. Westinghouse has evaluated the data and concluded that

, further data collection is not necessary. The evaluation Dy Westinghouse is included in the enclosure. Therefore, we request that the continuetion of ,

data collection be suspended. ,

Sincerely, William J. Cahill . Jr. I By: / '!

J. S. Marshall Generic - Licensing Manager CEJ/vid '

Enclosure c - Mr. T. A. Bergman. NRR Mr, R. D. Martin, Region IV -

Resident Inspectors, CPSES (2)

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