ML20206E569

Summarizes 881109 Telcon W/Util Re Control Area Ventilation Sys Mod & Associated Tech Spec Change.Addl Info Requested Stated

ML20206E569
Person / Time
Site:	McGuire, Mcguire
Issue date:	11/15/1988
From:	Hood D Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
TAC-65649, TAC-65650, NUDOCS 8811180119
Download: ML20206E569 (3)

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% UNITED STATES g g NUCLEAR REGULATORY COMMISSION D

l WASHING TON, D. C. 20665

/ November 15, 1988 Decket Hes.: 50-369 50-370 FACILITY: ficGuire Nuclear Station, Units 1 and 2 LICENSEE: Duke Power Company

SUBJECT:

RECORD OF TELEPHONE CONVERSATION REGARDING CONTROL AREA I VENTILATION SYSTEM MODIFICATION (TACS 65649 AND 65650)

On November 9, 1988, Messrs. D. Hood, C. Nichols, and B. Schin of the NRC called Messrs. S. LeRoy, M. Tertaglia, and J. Richardson of Duke Power Company regarding Duke's propcsed design modification and associated technical specification change to the control area ventilation (VC) system for McGuire Nuclear Station, Units 1 and 2. The changes are described in Duke's letters of June 19, 1987 and February 24, 1988.

The NRC requested the following additional information:

1. The proposed modification would replace two 50% capacity fans with one 100% capacity fan and decrease existing ducting and instrumentation.

Discuss the probabilities and consequences (operator exposure) associated with potential malfunctions of the existing system design ar.d the proposed system design. Using these results, show whether the benefits of the ,

change outweigh the risks associated with implementation of the modifi-cation. <

2. What alternatives to the proposed modification were considered? Was consideration given to retention of a two-fan design but replaced by fans of higher reliability? What were the advantages of the proposed  ;

modification which caused it to be selected rather than the alternatives considered?

3. Clarify your request regarding: (a) The operating status of each McGuire [

unit when the modification is being implemented; and (b) Whether the 21 days i requested is on a per-train, per-unit, or per-station basis.

4 Your letter of June 19, 1987 explained why 21 days rather than 7 days  !

was estimated to implement the modification and noted that Duke ,

would "take steps to reduce t h t time as much as possible." Discuss any changes in your current estimate of the tire needed to implement the modification.

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2-Duke stated that NRC approval of the TS change associated with implementing this modification will be needeo for the next Unit 2 refueling outage, which is presently scheduled to begin in June 1989. Duke estimated that responses to the above request could be provided in about 45 days, f/f Darl S. Hood, Project Manager Project Directorate !!~3 Division of Reactor Projects 1/11 Office of Nuclear Reactor Regulation cc: See next page DISTRIBUTION Docket File NRC PDR Local PDR PDIl-3 Reading S. Varga 14-E-4 G. Lainas 14-H-3 D. Matthews 14-H-25 M. Rood 14-H-25 D. Hood 14-H-25 OGC 15-B-13 E. Jordan NNBB-3302 B. Grimes 9-A-2 C. Nicholas 8-D-1 B. Schin Rll ACRS (10) P-315 MCGUIRE PLANT FILE PDIl-j i D5 ~!9 D11-3 FToo($PDi -Q DHood:sw DHatthews 11//b/88 11/jy/88 f 11/f$188

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

Mr. A.V. Carr, Esq. Dr. John it. Barry Duke Power Company Department of Environmental Health P. O. Box 33189 Mecklenburg County 422 South Church Street 1200 Blythe Boulevard Charlotte, North Carolina 28242 Charlotte, North Carolina 28203 County Manager of Mecklenburg County Mr. Dayne H. Brown, Chief 720 East Fourth Street Radiation protection Branch Charlotte, North Carolina 28202 Division of Facility Services Department of Human Resources 701 Barbour Drive Mr. Robert Gill Raleigh, North Carolina 27603-2008 Duke Puwer Company Nuclear Production Department P. O. Box 33189 Charlotte, North Carolina 28242 J. Michael McGarry, III, Esq.

Bishop, Liberman, Cook, Purcell and Reynolds 1200 Seventeenth Street, N.W.

Washington, D. C. 20036 Senior Resident Inspector c/o U.S. Nuclear Regulatory Commission Route 4, Box 529 Hunterville, North Carolina 28078 Regional Administrator, Region 11 U.S. Nuclear Regulatory Commission 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323 S. S. Kilburn Area Manager, Mid-South Area ESSD Projects Westinghouse Electric Corporation MNC West Tower - Bay 239 P. O. Box 355 Pittsburgh, Pennsylvania 15230 l

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