ML20086E373

Suppls 890501 Response to NRC Bulletin 88-011, Pressurizer Surge Line Thermal Stratification & leak-before-break Criteria.Based on Results of plant-specific Evaluation, Surge Line Temp Monitoring Program Suspended

ML20086E373
Person / Time
Site:	Comanche Peak
Issue date:	11/25/1991
From:	William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20086E382	List: ML20086E373 ML20086E386
References
IEB-88-011, IEB-88-11, TXX-91389, NUDOCS 9112020056
Download: ML20086E373 (3)

Text

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1 U3 Log # 1XX-91'sB9 Fi le # 10119 903.6 r Ref. # NRCB 88-11 TUELECTRIC November 25, 1991

% Hilam J. enhllt. Jr.

an. n. a rras.a.

U. S. Nuclear Regulatory C, cission Attn: Document Control Des,s Washington, D. C. 20555

SUBJECT:

COMANCHE PE AK S1E AM ELECTRIC ST ATION (CPSES) - Utill 1 DOCKET NO. 50-445 NRC BULLETIN 88-11: PRESSURIZER SURGE LINE

• THERMAL SlRAllflCATION AND LE AK-BEFORE-BRE AK ADDITIONAL INFORMATION REF: 1) 1U Electric Letter, TXX-89228, f rom William J. Cahill, Jr.

to the NRC dated May 1, 1989

2) TV Electric letter TXX-89706, f rom William J. Cahill, Jr.

to the NRC dated September 15, 1989

3) TV Electric Letter, TXX-89765, frcm William J. Cahill, Jr.

to the NRC, dated October 24, 1989

4) TU Electric letter, TXX-89792 f rom William J. Cahill, Jr.

to NRC dated November 2, 1989

5) TU Electric letter. TXX-898.i2 f rom William J. Cahill, Jr.

to NRC dated December 12, 19B9 -

Gentlemen:

On May 1, 1989, by reference (1), TU Electric submitted its response to NRC Bulletin B8-11. Reference (1) transmitted a plant specific evaluation of the effects of thermal stratification on the Comanche Peak Unit 1 Pressur her Surge Line (Surge Line) and its ability to satisfy leak-before-leak criteria.

TU Electric subsequently provided, by reference (2), response to NRC questions and clarifying information on the plant specific evaluation. Reference (3) provided additional information regarding surge line leak-before-break qualification. Ref erente (4) provided additional information regarding the plant specific evaluation in response to NRC staff request. Reference (5) was submitted to respond to concerns raised by the NRC staff in a conversation with M. Fields on November 8, 1989 and committed to monitoring until the first refueling outage commences or sufficient data has been collected to verify acceptability of the design transients, whichever occurs f 4st.

,. A 911 EC00% i i123 PDR ADOCK 050004*V5 '

O PDR 400 N. Ouve street LB. 81 Delin. Texu 75201

s t

TXX-91389 Page 2 of 2 lu Electric had previously confirmed the assumpt ions of the plant specific Surge Line evaluation by performance of a Surge Line temperature monitoring program during Hot Functional Testing (Hf 7). The NRC staf f expressed concerns that HF1 data may be insufficient in confirming that the existing design transients utilized in the plant specific evaluation are conservative. To provide further assurance that the design transients used in the plant specific Surge Line evaluation are conservative, a monitoring program was implemented tv collect sufficient data to confirm the adequacy of the design transients utilized by the plant specific evaluation. Although Westinghouse indicates in the enclosure that data were used from March 1990 to July 1991, the collection of data continued through the end of the first operating cycle.

This letter is to inform you that the data has been co!.%cted and the results are included in the enclosure. Based on the information provided in the enclosure,10 Electric is suspending the surge line temperature monitoring program.

The attachment provides the required affidavit in accordance with the requirement of NRC Bulletin 88-11 that responses be submitted under oath or affirmation under the provisions of section 182 of the Atomic Energy Act of 1954, as amended.

If there are any questians, please contact C. E. Jensen at (214) 812-8826.

Sincerely, j .

William J. Cahill, Jr.

CEJ/gj Enclosure Attachment c - Mr. R. D. Martin, Region IV Resident inspectors, CPSES (3)

Mr. T. A. Bergman, NRR I

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• Attachment to lxX-91389 Page 1 of 1 UN11ED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION In the Matter of )

)

Texas Utilities Electric Company ) Docket No. 50-446

)

(Comanche Peak Steam Electric )

Station, Unit 1) )

AFFIDAVil William J. Cahill, Jr. being duly sworn, hereby deposes and says that he is Group Vice President, Nuclear of TU Electric, the lead Applicant herein; that he is duly authorized to sign and file with the Nuclear Regulatory Commission this response to NRC Bulletin 88-11: Pressurizer Surge Line lhermal Stratification and Leak-Before-Break Additional In#ormation for the captioned facility; that he is familiar with the content thereof; and that the matters set forth-therein are true and correct to the best of his knowledge, information and belief.

//

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' William J. Cahil'1, Jr.

• L' Group Vice President, Nuclear STATE OF TEXAS )

)

COUN1Y OF SOMERVEI.L)

Subscribed and sworn to before me, on this 25th day of November , 1991, j

Notary Public L [? GU bM)

F ATRCtA WILSON j

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}/afa 16, GG l

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