ML17249A754

Forwards Replacement Page 16,Attachment A,To Re Proposal to Load Four Mixed Oxide Fuel Assemblies

ML17249A754
Person / Time
Site:	Ginna
Issue date:	03/05/1980
From:	White L ROCHESTER GAS & ELECTRIC CORP.
To:	Ziemann D Office of Nuclear Reactor Regulation
References
NUDOCS 8003110602
Download: ML17249A754 (4)

Text

REGULATORY I RMATION DISTRIBUTION SYS (RIDS)

ACCESSION NBR 80031 10602 DOC ~ DATE g SO/03/05 NOTARIZED!

NO DOCKE,T FACIL:50 244 Rober t Emmet Ginna Nuclear Pl anti'nit 1~ Rochester G

05000244'UTH BYNAME AUTHOR AFFILIATION

@HITE i Le De Rochester Gas 8 Electric-Corp.

RECIP ~ NAME RECIPIENT AFFILIATION ZIEMANNiD ~ L'e Operating Re'actors Branch 2

SUBJECT:

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1 '6<9 LEON D. WHITE JR.

VICE I'IIESIOENT E

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'>'C 5>>6 2 POLI March 5, 1980 Director of Nuclear Reactor Regulation ATTN:

Mr. Dennis L. Ziemann, Chief Operating Reactors Branch No. 2 U. S. Nuclear Regulatory Commission Washington, D. C.

20555

Dear Mr. Ziemann:

In our letter of February 20,

1980, we provided information regarding our proposal to 1'oad four mixed oxide fuel assemblies in Ginna Cycle 10, It has come to our attention that page 16 of Attachment A to that letter was not properly copied by our copier.

Therefore, we are enclosing with this letter forty (40) copies of page 16 to Attachment A.

Please insert this replacement page in the appropriate place.

Very truly yours, L. D. Wh e, Sr.

16 UESTION 7 It is the position of the staff that credit may not be taken for decay heat values different than those specified in Appendix K when calculating the results of a LOCA.

Therefore, please provide different justification that the MOX fuel will be less limiting than the UO2 fuel for Cycle 10.

~Res onse The ECCS performance of the mixed oxide fuel to be loaded in the R. E. Ginna Nuclear Plant core is bounded by an existing analysis considering standard uranium oxide fuel.

Since the fuel assembly designs are equivalent, the fluid thermal-hydraulic transients calculated for uranium oxide fuel may be applied to the mixed oxide fuel as well.

Fuel performance parameters

[pellet temperature, gap fillpressure, core peaking]

have been calculated for the mixed oxide fuel to be loaded in the Ginna core.

The fuel pellet average temperature upon which the most recent Westinghouse Evaluation Model ECCS performance analysis for Ginna is based is greater than the pellet average temperature of this mixed oxide fuel.

Therefore, the stored energy present in the mixed oxide fuel at the time of a LOCA will be less than the stored energy available in the uranium oxide fuel analysis, and the calculated peak clad temperature (PCT) will also be less.

The fillpressure of the mixed oxide fuel to be loaded in the Ginna core is less than the pressure utilized in the most recent Westinghouse analysis for Ginna, so no mixed oxide fuel PCT penalty due to clad burst effects can occur.

Clearly, the mixed oxide fuel performance parameters make it less limiting in an ECCS performance evaluation than uranium oxide fuel which has previously been analyzed for Ginna.

UESTION 8 Are the fuel assemblies "rods-off-bottom" or "rods-on-bottom"?

If "on-bottom" discuss how fuel rod bowing is considered.

~Res onse The design of the MOZ fuel assemblies is for the fuel rods to be off-bottom.

UESTION 9 The mixed oxide fuel assemblies are stated to be similar in mechanical design to Region 7 assemblies.

Discuss the performance of these fuel assemblies.

Was there any aspect of the performance of those assemblies which was outside of expectations?