ML20138R365

Requests Addl Info Re 850916 Proposed Change to Tech Spec 3/4.7.7, Auxiliary Bldg Filtered Ventilation Exhaust Sys, Justifying That Ventilation Exhaust Sys Can Independently Establish Negative Pressure.Info Needed within 30 Days

ML20138R365
Person / Time
Site:	Mcguire, McGuire
Issue date:	12/20/1985
From:	Youngblood B Office of Nuclear Reactor Regulation
To:	Tucker H DUKE POWER CO.
References
NUDOCS 8512310228
Download: ML20138R365 (3)

Text

+ 'o UNITED STATES g

8 o NUCLEAR REGULATORY COMMISSION t

t E WASMNGTON, D. C. 20555 DEC 2 01985

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Docket Nos.: 50-369 _.

and 50-370 l

6 Mr. H. B. Tucker, Vice President Nuclear Production Department t Duke Power Company 422 South Church Street Charlotte, North Carolina 28242 l

Subject:

REQUEST FOR ADDITIONAL INFORMATION REGARDING PROPOSED CHANGE T0 t MCGUIRE TECHNICAL SPECIFICATION 3/4.7.7 " AUXILIARY BUILDING FILTERED VENTILATION EXHAUST SYSTEM" l

( Your September 16. 1985, letter requests that the Action Statement to McGuire Technical Specification 3/4.7.7 " Auxiliary Building Filtered Ventilation Ex-L haust (VA) System" be modified to allow one system to be inoperable for 7 days. In support of this request, you note that, while there is only one VA

! system per unit, the total system can be considered redundant because: (1) each system has its air intake in the same general open areas of the Auxiliary

[ Building; (2) each VA system, while not of equivalent capacity, is capable of maintaining the Auxiliary Building at a negative pressure; (3) following a LOCA on either reactor, both VA systems start automatically; and, (4) both VA systems have a diversity of power sources. You also indicate that these t-- -systems are not required to reduce the consequences of ECCS pump room leakage in order to meat 10 CFR 100 dose criteria following a design basis LOCA.

p. Our evaluation of the radiological consequences of a design basis LOCA includes an assumption of leakage associated with a gross failure of a passive component pursuant to Standard Review Plan 15.6.5 Appendix B. We find that at least one of the two VA Systems is necessary to mitigate the consequences of a LOCA.

I Therefore, we require additional data justifying that the VA System of lower flow capacity (43,400 cfm) can independently establish negative pressure for those areas normally serviced by the 54,282 cfm VA System.

A concomitant staff concern regards the capability of either VA system to pro-vide adequate ventilation to all cubicles for cooling purposes. For the shared VA system, one VA train is required to provide cooling for LOCA loads in one unit, concurrent with shutdown loads without offsite power in the other unit.

Under the proposed amendments, it would seem that all cubicles would experience reduced flows and to varying degrees. The staff requires additional data justifying that such reduced flows would not have a detrimental effect on equip-

! ment operation.

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l Mr. H. B. Tucker Duke Power Company McGuire Nuclear Station cc:

Mr. A. Carr Dr. John M. Barry

Duke Power Company Department of Environmental Health j P. O. Box 33189 Mecklenburg County 422 South Church Street 1200 Blythe Boulevard Charlotte, North Carolina 28242 Charlotte, North Carolina 28203 Mr. F. J. Twogood County Manager of Mecklenburg County Power Systems Division 720 East Fourth Street Westinghouse Electric Corp. Charlotte, North Carolina 28202 I P. O. Box 355 l

Pittsburgh, Pennsylvania 15230 Chaiman, North Carolina Utilities l Comission

, Mr. Robert Gill Dobbs Building Duke Power Company 430 North Salisbury Street

! Nuclear Production Department Raleigh, North Carolina 27602 P. O. Box 33189 g Charlotte, North Carolina 28242 Mr. Dayne H. Brown, Chief Radiation Protection Branch I

J. Michael McGarry, III, Esq. Division of Facility Services Bishop. Liberman, Cook, Purcell Department of Human Resources and Reynolds P.O. Box 12200 1200 Seventeenth Street, N.W. Raleigh, North Carolina 27605 Washington, D. C. 20036 Senior Resident Inspector c/o U.S. Nuclear Regulatory Comission Route 4, Box 529 Hunterville, North Carolina 28078 Regional Administrator, Region II l U.S. Nuclear Regulatory Comission,

. 101 Marietta Street, N.W., Suite 2900 6

Atlanta, Georgia 30323 L. L. Williams

! Operating Plants Projects Regional Manager

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Westinghouse Electric Corporation - R&D 701 P. O. Box 2728 Pittsburgh, Pennsylvania 15230 I

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DEC 2 01985 Mr. H. B. Tucker  !

l Your reply to the above two items is requested within 30 days of this letter.

Contact our Project Manager, Darl Hood, at (301) 492-8408 ff you have any questions.

Sincerely,

/5/

! B. J. Youngblood, Director

, PWR Project Directorate _ #4 l Division of PWR Licensing-A cc:- See next page 1

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