ML19351A604

Responds to Concerns Raised by NRC During 891108 Conversation W/M Fields & Provides Required Affidavit Per NRC Bulletin 88-011, Pressurizer Surge Line Thermal Stratification & Leak-Before-Break, as Amended

ML19351A604
Person / Time
Site:	Comanche Peak
Issue date:	12/12/1989
From:	William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
IEB-88-011, IEB-88-11, TXX-89832, NUDOCS 8912190421
Download: ML19351A604 (3)

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yggg[g(;77pjg Ref. # NRCB 88 December 12, 1989 Wimam J. Cahm, Jr.

Executive l'kr PreskJrnt

>U. S. Nuclear Regulatory Commission

. Attn: Document Control Desk Washington, D. C. 20555 t

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SUBJECT:

- COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET NOS. 50-445 AND 50-446 3 NRC BULLETIN 88-11: PRESSURIZER SURGE LINE

.. ' THERMAL STRATIFICATION AND LEAK-BEFORE-BREAK '

h- ADDITIONAL INFORMATION L REF: 1) TV Electric letter (TXX-89228) from W. J. Cahill, Jr.

to NRC dated May 1, 1989.

L 2) TV Electric letter (TXX-89706) from W. J. Cahill, Jr.  ;

l. to NRC dated September 15, 1989, 3)- TU Electric letter (TXX-89765) from W. J. Cahill Jr.

! to NRC dated October 24, 1989.

4) TV Electric letter (TXX-89792) from W. J. Cahill, Jr.

to NRC dated November 2, 1989.

Gentlemen:

On May 1, 1989, by reference (1), TU Electric submitted its response to NRC-

i. Bulletin 88-11. Reference (1) transmitted a plant specific evaluation of the effects of thermal stratification on the Comanche Peak Unit 1 Pressurizer ,

Surge Line (Surge Line) and its ability to satisfy leak-before-break criteria.

TV 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 L qualification. Reference (4) provided additional information regarding the L plant specific evaluation in response to NRC staff request. This letter is being submitted to respond-to concerns raised by the NRC staff in a L conversation with M. Fields on November 8,1989, i

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8912190421 891212 PDR ADOCK 05000445 Q PDC 400 North Ouve Street LB.81 Dallas, Texas 75201 f30

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TXX-89832 December 12, 1989 Page 2 of 2 ,

TV Electric had previously confirmed the assumptions of the plant specific Surge Line evaluation by performance of a Surge Line temperature monitoring '

program during Hot Functional Testing (HFT). The NRC staff expressed concerns that HFT 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 will be ,

implemented to collect sufficient data to confirm the adequacy of the design transients utilized by the plant specific evaluation. The Surge Line temperature monitoring program will be terminated when the first refueling outage commences or when the NRC and TV Electric agree that sufficient data-has- been collected to-verify acceptability of the design transients used by  :

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the plant specific evaluation, whichever_is sooner.

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 questions, please contact H. A. Harvray at (214) 812-8296.

Sincerely,

/

William J. ahill, Jr.

HAH /smp Attachment c - Mr. R. D. Hartin, Region IV Resident Inspectors, CPSES (3) l l-i l'

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Attachment ts TXX-89832. I s December 12. 1989 l

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-UNITED STATES OF AMERICA.

NUCLEAR REGULATORY COMMISSION 1

In the Matter of )  ;

)

Texas Utilities Electric Company ) Docket Nos. 50-445

) 50-446 (Comanche Peak Steam Electric )

Station, Units 1 & 2) )

AFFIDAVIT William J. Cahill, Jr. being duly sworn, hereby deposes and says that he is i Executive Vice President, Nuclear of TU Electric, the lead Applicant herein: l that he is duly authorized to sign and file with the Nuclear Regulatory Commission this supplementary response to NRC Bulletin 88-11: 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.

L, n 2_t // \

WilliamJ. Cap'1/l,Jr. If l Executive VicV President, Nuclear l l

l STATE OF TEXAS )  ;

COUNTY OF Nd -

Subscribed and sworn to before me, a Notary Public, on this //d day of A M w , 1989.

f <.-<u Notary Public Ybh .

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