ML20148P186

Requests Addl Info Re 970506 Submittal of Proposed Changes to TS 3/4.7.5, Ultimate Heat Sink, to Support SG Replacement at Plant

ML20148P186
Person / Time
Site:	Byron
Issue date:	06/26/1997
From:	Dick G NRC (Affiliation Not Assigned)
To:	Johnson I COMMONWEALTH EDISON CO.
References
TAC-M98754, TAC-M98755, NUDOCS 9707010319
Download: ML20148P186 (5)

Text

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. eA7E7%4 l p UNITED STATES g

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NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 2006Hm01

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June 26, 1997 l

s Ms. Irene Johnson, Acting Manager i Nuclear Regulatory Services Commonwealth Edison Company Executive Towers West III l 1400 Opus Place, Suite 500 I Downers Grove. IL 60515 ,

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION RELATED TO REVISION OF ULTIMATE HEAT SINK TECHNICAL SPECIFICATIONS FOR BYRON STATION, UNITS 1 AND 2 (TAC NOS. M98754 AND M98755)

Dear Ms. Johnson:

By letter dated May 6, 1997. Commonwealth Edison Company (Comed) proposed l changes to Technical Specification 3/4.7.5, " Ultimate Heat Sink" to support I steam generator replacement at Byron Station, Unit 1. The planned steam  !

generator replacement required reanalysis of the ultimate haat sink (UHS) capability due to the increased mass and energy releases associated with the new generators. In order to complete the revies 1 make an acceptability l determination regarding this issue, the staff neet the following additional information related to your single failure analysic 1, In your UHS basin temperature evaluations for the various scenarios considered, you discuss the single active failure of one of the cooling  !

tower fans. It is not clear to the staff that you have considered the 1 worst case single active failure during your analyses. Please describe why the single active failure of a cooling tower fan is the most limiting single active failure. In your response you should discuss the possibility of single electrical failures (e.g., loss of bus, breaker trip, loss of diesel generator) that can result in the loss of more than one fan.

2. In your UHS basin water level evaluation you describe two scenarios.

Both of these scenarios identify the failure of one of the makeup pumps as an example of a single active failure. Similar to Item 1 above.

please provide information to verify that you have considered the worst case single active failure that could affect UHS basin level. In your response you should discuss the possibility of electrical failures that j NO k l l

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I. Johnson may result in the loss of one or more fans, in addition to the loss of one of the makeup pumps (i.e., loss of bus that supplies power to fan (s) and makeup pump).

Please provide the additional information so that we may continue our review of your request.

Sincerely, Geor e Dick, Jr., Senior Project Manager Project Directorate III-2 Division of Reactor Projects - III/IV Office of Nuclear Reactor Regulation Docket Nos. STN 50-454 and STN 50-455 cc: see next page l

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i I. Johnson may result in the loss of one or more fans, in addition to the loss of one of the makeup pumps (i.e., loss of bus that supplies power to fan (s) and makeup pump).

Please provide the additional information so'that we may continue our review of your request.

Sincerely, I

Original signed by:

l George Dick, Jr.. Senior Project Marager l Project Directorate III-2 i Division of Reactor Projects - III/IV Office of Nuclear Reactor Regulation i Docket Nos. STN 50-454 and STN 50-455 cc: see next page l _ Jistributign:

l 9 bcket F1'le l cPUBLIC PDIII-2 r/f' J. Roe, JWR E. Adensam. EGA1 R. Capra C. Moore S. Bailey G. Dick W. LeFave OGC. 015B18 l ACRS, T2E26 l R. Lanksbury. RIII L. Marsh gQ I DOCUMENT NAME: BYRON \BY98754.RAI y Ta receive a copy of this document,indcafe19 thg box: "C" = Copy without enclosures *E' = Copy with enclo}ures "N" = No copy l0FFICE PM:PDIll-2 l6 LA:MIII-2 6 PM:PDIIy-2,,lE D:#%L4i BC:SPLB a '

i lNAME SBAILEY 9# QidORE GDICK h4[ 8PNA" LMARSHg]jy""

06/p /97 0604/97 06/)3/97 ~ 1 3/ W 97 lDATE 0FFICIAL RECORD COPY

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• I. Johnson may result in the loss of one or more fans, in addition to the loss of one of the makeup pumps (i.e.. loss of bus that supplies power to fan (s) and makeup pump).

Please provide the additional information so that we may continue our review of your request.

Sincerely.

1 Original signed by:  ;

l George Dick Jr. Senior Project Manager  !

Project Directorate III-2 l Division of Reactor Projects - III/IV l Office of Nuclear Reactor Regulation Docket Nos. STN 50-454 and STN 50-455 cc: see next page Distribution:

Docket File PUBLIC PDIII-2 r/f' J. Roe. JWR E. Adensam. EGA1 R. Capra C. Moore l S. Bailey l G. Dick l W. LeFave 1 OGC. 015B18 ACRS. T2E26 R. Lanksbury. RIII l L. Marsh i

l DOCUMENT NAME: BYRON \BY98754.RAI Ta receive a copy of this document, Indicafe'1r4 th 9 box: "C" = Copy without enclosures *E' = Copy with encic}ures "N" = No copy 0FFICE PM:PDill-2 l6 LA:}MIII-2 b PM:PDilV-R,lE D:#@t,L4 l BC:SPLB v '

NAME SBAILEY 98 490RE GDICK h4[ RRPRA" LMARSH /7/#"

DATE 06/2 3/97 06/# /97 06/J 3/97 ' Ti/%/97 06/25/97 /

OFFICIAL RECORD COPY

a I. Johnson Byron Station Commonwealth Edison Company Unit Nos. I and 2 cc:

Michael I. Miller, Esquire Chairman, Ogle County Board Sidley and Austin Post Office Box 357 One First National Plaza Oregon, Illinois 61061 Chicago, Illinois 60603 Mrs. Phillip B. Johnson Regional Administrator, Region III 1907 Stratford Lane U.S. Nuclear Regulatory Commission Rockford, Illinois 61107 801 Warrenville Road Lisle, Illinois 60532-4351 Attorney General l 500 South Second Street l Illinois Department of Springfield, Illinois 62701 '

Nuclear Safety Office of Nuclear Facility Safety EIS Review Coordinator 1035 Outer Park Drive U.S. Environmental Protection Agency Springfield, Illinois 62704 77 W. Jackson Blvd.

Chicago, Illinois 60604-3590 Document Control Desk-Licensing Commonwealth Edison Company Commonwealth Edison Company 1400 Opus Place, Suite 400 Byron Station Manager Downers Grove, Illinois 60515 4450 North German Church Road Byron, Illinois 61010 Mr. William P. Poirier, Director Westinghouse Electric Corporation Kenneth Graesser, Site Vice President Energy Systems Business Unit Byron Station Post Office Box 355, Bay 236 West Commonwealth Edison Station Pittsburgh, Pennsylvania 15230 4450 N. German Church Road Byron, Illinois 61010 Joseph Gallo Gallo & Ross 1250 Eye St., N.W.

Suite 302 Washington, DC 20005 Howard A. Learner Environmental law and Policy Center of the Midwast 203 North LaSalle Street Suite 1390 Chicago, Illinois 60601 U.S. Nuclear Regulatory Commission Byron Resident Inspectors Office 4448 North German Church Road Byron, Illinois 61010-9750 Ms. Lorraine Creek Rt. 1, Box 182 Manteno, Illinois 60950

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