ML17207A765

Forwards Sensitivity Evaluation of C-E ECCS Evaluation Model to Cladding Rupture Strain & Fuel Assembly Flow Blockage Models. Fuel Vendor ECCS Analyses in Compliance w/10CFR50.46

ML17207A765
Person / Time
Site:	Saint Lucie
Issue date:	01/23/1980
From:	Robert E. Uhrig FLORIDA POWER & LIGHT CO.
To:	Eisenhut D Office of Nuclear Reactor Regulation
Shared Package
ML17207A766	List: ML17207A765 ML17207A767
References
1-80-31, NUDOCS 8001290353
Download: ML17207A765 (4)

Text

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ACCESSION NBR:8001290353 DOC ~ DATE: 80/01/23 NOTARIZED:

YES I.%CIA:50 335 St

~ Lucie Pl anti Unit ir F'Iorida Power K t;ight eo ~

AUTH ~ NAME AUTHOR AFFILIATION UHRlGrR ~ ED Florida Power L L'ight Co.

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8'i>vAXW FLORIDA POWER 4 LIGHTCOMPANY January 23, 1980 L-80-31 Office of Nuclear Reactor Regulation Attention:

Hr. Darrell G. Eisenhut, Acting Director Division of Operating Reactors U. S. Nuclear Regulatory Commission Mashington, D.

C.

20555

Dear l1r. Eisenhut:

Re:

St. Lucie Unit 1

Docket No. 50-335 Effects of Fuel Clad Research Data on ECCS Anal sis Our letter L-80-9 of January 9, 1980 responded to your letters of November 9

and November 27, 1979 concerning the potential effect of new fuel clad research data on the ECCS analysis for St. Lucie Unit 1.

This letter follows up our commitment to provide the results of an evaluat',on by our fuel vendor.

In order to respond to the NRC concern in a timely manner, our fuel vendor performed an analysis for the operating plants with their fuel.

The attached analysis was performed for the plant most limited by the new NRC models for the previously determined limiting break size.

The Combustion Engineering ECCS Evaluation tlodel of September, 1978 was used for this analysis.

The method for including the new NRC rupture strain and blockage models is described in detail in Section III of the attached report.

Results of the analysis are summarized. in Section IV of the report.

lilith higher (more conservative) strain and blockage, a lower peak cladding temperature than calculated for the reference cycle was obtained.

The applicability of the analysis to St.

Lucie Unit 1 is provided in Sections V and VI.

As a result of the analysis documented in the attached

report, we believe that the ECCS analyses performed for our plant by our fuel vendor continue to be in compliance with the limi'ts of 10CFR50.46.

Very trul

yours, Robert E. Uhri g Vice President Advanced Systems 8 Technology REU/tQS/SKN/cph cc:

l1r. J.

P. O'Reilly, Region II Harold Reis, Esquire 8 II01890 PEOPLE..

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