ML20113D849

Informs That Util Appreciates NRC Efforts in Considering Issues Re Unit 1 Cycle Lenth

ML20113D849
Person / Time
Site:	Byron
Issue date:	06/27/1996
From:	Graesser K COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
BYRON-96-0188, BYRON-96-188, NUDOCS 9607030380
Download: ML20113D849 (2)

Text

, , Commonweahh lihson Company Hyron Generating Station 4450 North German Church Road

. .-' H)ron. lL 6 tOlW91 l Tel 815 2365 f il I June 27,1996 LTR: BYRON-96-0188 FILE: 3.11.0530 1 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001

SUBJECT:

Byron Unit 1 Cycle Length l

Byron Station Unit 1 NRC Docket Number: 50-454

REFERENCE:

June 20,1996, Meeting between the Commonwealth Edison Company and the Nuclear Regulatory Commission At the Referenced meeting, the Commonwealth Edison Company (Comed) presented information which justified an upcoming Byron Unit i operating cycle length equivalent to 1.1 Effective Full Power Years. This is an operating period equivalent in length to Cycle 7 (the operating period from the B1R06 refueling outage to the B1R07 refueling outage). The Nuclear Regulatory Commission (NRC) agreed with this justification and suggested that the committed cycle length i

would be more appropriately stated in days of operation greater than T-Hot of 500 F. Based upon  !

a review of operating records, Comed will limit the operation of Byron Unit I to 448.5 days above T-Hot of 500 F during Cycle 8. This time frame is equivalent to the number of calendar days with T-Hot above 500 F during Cycle 7.

As you are aware, Comed is aggressively pursuing a steam generator replacement schedule that would make Cycle 8 the last operating cycle for the current Unit 1 Model D-4 Steam Generators.

Many factors are being evaluated to determine the appropriate outage start date for the Steam Generator Replacement Outage. As discussed during the meeting, in the event the replacement outage start date would result in exceeding 448.5 days of operation above T-Hot of 500 F, Comed will contact the staff and present its justification for a commitment change to allow operation of Unit I until the replacement outage.

As discussed at the meeting, Comed will docket the technical justification supporting 448.5 days of operation above T-Hot of 500 within 90 days of unit startup.

D 9607030380 960627 QOl PDR ADOCK 05000454 D P PDR l

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i Byron Ltr. 96-0188 June 27,1996 i 1

Page 2 l . Comed appreciates all of the NRC's efforts in considering these issues. Please direct any questions regarding this letter to Denise Saccomando, Senior PWR NLA, at (708) 663-7283.

Sincerely, l

I l

K. L. Graesser Site Vice President Byron Nuclear Power Station l

KLG/LZ/rp

! cc: D. Lynch, Senior Project Manager - NRR l G. Dick, Byron Project Manager, - NRR l H. Peterson, Senior Resident Inspector - Byron l H. Milkr, Regional Administrator - Rill Office of Nuclear Safety-IDNS i

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