ML19317F749

Notifies of Incorrect Uncertainty Value in Util 780424 Ltr to Nrc.Correct Value 2.2%.Forwards, Determination of Total Reactor Coolant Flowrate & Its Accuracy for Facility & Statement Re Secondary Sys Foreign Matl & Deposits

ML19317F749
Person / Time
Site:	Davis Besse
Issue date:	05/26/1978
From:	Roe L TOLEDO EDISON CO.
To:	Stolz J Office of Nuclear Reactor Regulation
Shared Package
ML19317F750	List: ML19317F749 ML19317F753
References
NUDOCS 8001230653
Download: ML19317F749 (2)

Text

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TOLEDO EDISON Docket No. 50-346 LOWELL E. ROE Operating License No. F 3 I.N.'E.*ioom.a.

(4191 259-5242 May 26, 1978 Serial No. 436 ,

Director of Nuclear Reactor Regulations Attention: Mr. John F. Stolz, Chief Light Water Reactors Branch No.1 -

Division of Project Management ,

United States Nuclear Regulatory Commission Washington, D. C. 20555

Dear Mr. Stolz:

As a result of our review of the uncertainties in the determination of the reactor coolant flow rate at the Davis-Besse Nuclear Power Station Unit No. 1, we have found that the value for the uncertainty given in our letter to you dated April 24, 1978 (Serial No. 428) is incorrect. Attach-ment I to this letter shows that the actual uncertainty value is 2.2%.

Attachment 2 is a ** Statement Addressing Foreign Material and Deposits in Secondary System."

The uncertainties on the reactor coolant flow rate are incorporated in the technical specification changes given in the attachment to our letter to you dated May 26,1978 (Serial No. 439).

The reactor coolant flow rate uncertainty also impacts the treatment of the rod bow ef fect as addressed in our letter to Mr. Roger S. Boyd dated April 10, 1978 (Serial No. 426).

Yours very truly, f

Attachment jh c/11 f THE TOLECO EDISCN COMPANY ECISCN PLAZA 300 MADISON AVENUE TOLECO. CHIO 43652