ML19317E501

Forwards Partial Loop ECCS Analysis, as Suppl to 750709 Submittal Per B&W rept,BAW-10103.Results Show That Peak Cladding Temps for Partial Loop Operation Significantly Below four-pump,full Power Operation Results of B&W Rept

ML19317E501
Person / Time
Site:	Oconee
Issue date:	08/01/1975
From:	Parker W DUKE POWER CO.
To:	Giambusso A Office of Nuclear Reactor Regulation
Shared Package
ML19317E502	List: ML19317E501 ML19317E506
References
NUDOCS 7912180740
Download: ML19317E501 (2)

Text

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NRC vaSTRIBUTION FOR PART 50 DOCKE: MATERI AL

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CONTROL NO: 231 FILE:

FROM: Duke Power Company DATE OF DOC D ATE R EC'D LTR TWX RDT OTHER Charlotte, NC 1 W O Parker 3r 8-1-75 8-5-75 XX i TO: ORIG CC OTHER SENT NRC PDR XX Mr Giambusse one signed SENT LOCAL PDR XX CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO:

XXX 1 70/287 DESCRIPTION: ENCLOSURES:

Ltr re theft 7-7-75 submittal...trans the information concerning re-ev;1uation of ECCS following: :ooling performance for partial loop operation. . .

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PLANT N AME: Oconee 1-2-3 FOR ACTION /INFORMATION 3-5-75 ehf BUTLER (L) SCHWENCER (L) ZIEM ANN (L) REGAN (E)

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v. t Pats t t m August 1, 1975 It.t *= QN C:AAte704 s , t. p.: x:. 'o,. r 3-4:e3 Mr. Angelo Giambusso, Director ,

Division of Reactor Licensing U. S. Nuclear Regulatory Commission __

Washington, D. C. 20555 Re: Oconee Nuclear Station '

Docket Nos. 50-269, -270, -287 ,.

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Dear Mr. Giambusso:

Supplementing our submittal of July 9, 1975, Duke Power Company submits herewith information concerning re-evaluation of ECCS cooling performance for partial loop operation. This re-evaluation addresses two cases of three reactor coolant pump operation at the LOCA limited maximum allowable peak linear heat rate for four-pump operation, as established in BAW-10103, "ECCS Analysis of B&W's 177-FA Lowered-Loop NSS." The worst case break assumed is ldentical to that reported in BAW-10103.

The results of these analyses show that the peak cladding temperatures for partial loop operation are significantly below the four-pump, full power operation results reported in BAW-10103. These results, therefore, substantiate the proposed Technical Specifications for three- and two-pump operation submitted on July 9, 1975.

Forty copies of this letter and attachment are enclosed.

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Ver7 truly yours,

./O u_a - ef . . c y

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-' William O. Parker, Jr. /N' t :.n A

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