ML19316A037

Advises of Installation of Flow Restrictors in Core Flooding Nozzles Entering Reactor Vessel.Addl Info Re 730129 FSAR Revision Filing Transmitted Under Separate Cover

ML19316A037
Person / Time
Site:	Oconee
Issue date:	01/12/1973
From:	Thies A DUKE POWER CO.
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML19316A038	List: ML19316A037 ML19316A039 ML19316A040
References
NUDOCS 7911210598
Download: ML19316A037 (2)

Text

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,. (TEMPoaARY FORM) CONTROL NO: 412 6

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Ltr advising of the installation of flow reatrictors in each core flooding nozzles Ltr 1-15-73 fm B6W to Giambusso w/ attached....

.cntering the reactor vessel....trans the Babcoc~k'& Wilcox Report.. including...

Atchmt I - Description & mechanical design of

$'? MEN DO X0T REMOVE Atchmt 2 ina"1y T of the core flooding 11tne break with the flow restrictor in PLANI NA1CS: Oconee Units 1-2-3

- Atchmt 3- effect of the device on the f net aperation of ECCS for both large & small breaks.

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PAODUCTIO's ANO Taamoneesssoes January 12, 1973 r L v.

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-} nzt Mr. Angelo Giambusso D '~ ...s grrrn Deputy Director for Reactor Projects / 1,Lj,$

/g Directorate of Licensing 4 U. S. Atomic Energy Commission tu , '

Washington, D. C. 20545

• Re: Oconee Nuclear ion Docket Nos. 26 -270, and -287

Dear Mr. Giambusso:

Duke Power Company is installing flow restrictors in each of the core flooding nozzles entering the reactor vessel at Oconee Nuclear Station.

The purpoce of these restrictors is to limit the magnitude of the blowdown and retain more water in the reactor vessel during a core flood line break loss-of-coolant accident. As discussed with members of your staff in Bethesda, Maryland on January 4, 1973, we will file a revision to the Final Safety Analysis Report by January 29, 1973 to document necessary information for your review on the core flood line restrictors. The purpose of this letter is to provide you with the substance of the information that will be filed on January 29 at an earlier date for your review.

The information, which has been transmitted to you under separate cover, provides a description of the mechanical design of the flow restrictor, provides an analysis of the core flood line break with the flow restrictor in place, and shows the effect ofithe restrictor on the operation of the emergency core cooling system for both large and sms11 breaks. These resultsdemonstratethatalloft$eAECinterimacceptancecriteriafor {

emergency core cooling systems are satisfied. 1 Please advise if you have additional questions.

Sincerely, c)  %

A.'C. Thies N

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