ML20129H658

Forwards RAI Re Extension of Operating Cycle for Plant,Unit 1 from 448.5 Days to 600 Days

ML20129H658
Person / Time
Site:	Byron
Issue date:	10/30/1996
From:	Lynch D NRC (Affiliation Not Assigned)
To:	Johnson I COMMONWEALTH EDISON CO.
References
TAC-M96904, NUDOCS 9611010302
Download: ML20129H658 (3)

Text

. _ _ _ _ _ _ _ _ .

October 30, 1996 Ms. Irene M. Johnson, Acting Manager ,

Nuclear Regulatory Services I Commonwealth Edison Company Executive Towers West III i 1400 Opus Place, Suite 500 Downers Grove, IL 60515 l

SUBJECT:

l REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING AN EXTENSION OF THE OPERATING CYCLE FOR BYRON, UNIT 1 (TAC NO. M96904) l

Dear Ms. Johnson:

In its letter of June 27, 1996, Commonwealth Edison Company (Comed) committed 4 to limit the length of the current operating cycle for Byron, Unit 1, to 448.5 days with T-hot above 500 degrees Fahrenheit. On October 18, 1996, Comed 3 submitted a request to extend the Byron, Unit 1, operating period from 448.5

days to 600 days. Operating for 600 daya without having to shut down for a i

steam generator tube inspection would permit the plant to operate until February 1997, at which time the unit is scheduled to shut down for steam generator replacement.

) During the initial review of the request, we have identified the need for i additional information as discussed in the enclosure. Please provide the i requested information so that we may complete our review.

4 Sincerely, j /r/

M. David Lynch, Project Manager  !

Project Directorate III-2 4

Division of Reactor Projects - III/IV

. Office of Nuclear Reactor Regulation i Docket No. STN 50-454

Enclosure:

RAI cc w/ enc 1: See next page IRC FEE CENTER COPY nom Distribution:

Docket File PUBLIC PDIII-2 r/f i M.' D. Lynch G. Dick J. Roe, JWR P. Rush, 07D4 C. Moore E. Adensam, EGA1 E. Sullivan, 07D4 R. Capra OCC, 015B18 ACRS, T2E26 R. Lanksbury, RIII

, DOCUMENT NAME: BYRON \BY96904.RAI Ta receive e copy of this document, indicetAthe box: "C" = Copy without enclosures *E" = Copy with enclosures *N' - No copy h

0FFICE PM:PDIII-A D 'LA:PQ[II-t l 6 D:PDIII-2/1 . 16 MDLYNCH ,%

NAME Q400RE ~ \ $CAPRA (A /,l!

Vj lV/sc/96' DATE 10/%Q96 V 10/5'/96

^'FICIAL RECORD COPY I \)

i 9611010302 961030 2

PDR ADOCK 05000454 P PDR

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 500 South Second Street 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.

3 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 Midwest 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

+

a RE0 VEST FOR ADDITIONAL INFORMATION EXTENSION OF PLANT OPERATING PERIOD COMMONWEALTH EDISON COMPANY BYRON STATION. UNIT 1 t

DOCKET NO. STN 50-454 The submittal dated October 18, 1996, proposes the use of a probability of detection (POD) for inspection of C,8. As stated in Section 4.3 of the submittal, this value is a corsa,*ative estimate of P00 based on the results of the Byron blind test resuli .. The POD value of 0.6 applied in voltage-based tube repair criteria appi. cations following the guidance of NRC Generic Letter 95-05 was established considering not only the detection capabilities of the analysts and the inspection technology, but also the initiation and growth of new indications over the next operating cycle. Discuss how the Byron, Unit 1, operational assessment accounts for the initiation and growth of new indications over the proposed extended operating cycle.

ENCLOSURE