ML17254A678

Forwards Demonstration of Conformance of Exxon Nuclear Co Fuel to Westinghouse K(Z) Operating Envelope for Re Ginna Nuclear Power Plant. Analysis Demonstrates That Chopped Cosine Power Shape Most Limiting for Peak Cold Temp

ML17254A678
Person / Time
Site:	Ginna
Issue date:	12/16/1985
From:	Kober R ROCHESTER GAS & ELECTRIC CORP.
To:	Lear G Office of Nuclear Reactor Regulation
Shared Package
ML17254A679	List: ML17254A678 ML17254A680
References
NUDOCS 8512200244
Download: ML17254A678 (6)

Text

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~FACIL:50-244 Robev't Emmet Qinna Nuclear Plant>

Unit 1> Rochester Q

05000244 AUTH. NAlfE AUTHOR AFFILIATION KOBER> R. W.

Rochestev Qas h Electric Corp.

RECIP. NANE RECIPIENT AFFILIATION LEAR> Q. E.

PWR Pv'object Div ectov ate 1

SUBJECT:

Forward s "Demonstration of Conf ormanc e of Exxon Nuc lear Co Fuel to Westinghouse K(Z) Opev ating Envelope For RE Qinna Nucleav'oeer Plant. " Analysis demonstrates that chopped cosine power shape most limiting fov peak cold temp.

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Zrii/ II fii'ZZu//I ROCHESTER GAS AND ELECTRIC CORPORATION o 89 EAST AVENUE, ROCHESTER, N.Y. 14649.0001 ROGER W. KOBER VICE PIIESIDENT ELECTRIC 6 STEAM PAODUCTION TELEPHONE AREA coDE TIS 546 2700 December 16, 1985 Director of Nuclear Reactor Regulation Attention:

Mr. George E. Lear> Chief PWR Project Directorate No.

1 U.S. Nuclear Regulatory Commission Washington, D.C.

20555

Subject:

Demonstration of Conformance with K(z) Curve R. E. Ginna Nuclear Power Plant Docket No. 50-244

Dear Mr. Lear:

An NRC letter dated April 5>

1985K "Exxon Code Error" (Reference

1) discussed four concerns the Staff had on LOCA analyses done by Exxon Nuclear Corporation (ENC).

As stated in the April 5 letter> only one of the four concerns pertained to Ginna< that was the validity of applying the Westinghouse-derived K(z) curve to ENC fuel.

ENC assumed that the Westinghouse-derived K(z) curve applied to the ENC fuel but additional support for this assumption was required by the NRC.

Currently>

LOCA analysis for Ginna is performed by Westinghouse using the approved Westinghouse evaluation model.

The analysis performed by Westinghouse bounds all fuel currently loaded at Ginna.

This conclusion is supported by the analysis in Attachment A.

The attached analysis demonstrates that the chopped cosine power shape is the most limiting for peak clad temperature (PCT).

Comparing the results of the attached analysis to the analysis presented in Reference 2 confirms that the Westinghouse Optimized Fuel Assembly (OFA) fuel is the most limiting based on PCT.

The attached Westinghouse analysis demonstrates that the ENC fuel in Ginna is in conformance with Section I.A. of Appendix K to 10 CFR Part 50.

Specifically< an approved model has been used for evaluation of ECCS performance following a LOCA for the current fuel configuration at Ginna.

This model adequately addresses, a

"range of power distribution shapes and peaking factors 8512200244 851216 PDR ADOCK 05000244 P

PDR J, Knight (Itr only)'B (BALLARB)

EICSB (ROSA)

PSB (CANNILL)

A~

RSB (BERLINGER)

FOB (BENAROYA)

ROCHESTER GAS AND ELECTRIC CORP December 16~

1985 Mr. george E. Lear SHEET NO.

representing power distributions that may occur over the core lifetime".

The Staff-imposed 50 F penalty for fuel-related 0

differences is no longer required.

V truly yoursr 4/

Roger W. Kober Reference 1:

H.L. Thompson (NRC) to R.W. Kober (RGE) letter dated April 5I 1985<

"Exxon Code Error" Reference 2:

J.E.

Maier (RGE) to H.R. Denton (NRC) letter dated December 20I 1983 transmitting Application for Amendment to Technical Specificationsi December 20I 1983.

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