ML17216A440
| ML17216A440 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 03/10/1986 |
| From: | Woody C FLORIDA POWER & LIGHT CO. |
| To: | Thadani A Office of Nuclear Reactor Regulation |
| References | |
| L-86-81, NUDOCS 8603130248 | |
| Download: ML17216A440 (4) | |
Text
REQULATQR~NFQRNATION DISTRIBUTION S EN (RIDS)
N ACCESSION NBR: 8603130248 DOC. DATE: 86/03/10 NOTARIZED:
NO FACIL: 50-389 St.
Luc ie Plant>
Unit 2i Flov'ida Power 5 Light Co.
AUTH. NAME AUTHOR AFFILIATION WOODY> C. O.
Flov ida Powev 5 Light Co.
REC IP. NANE RECIPIENT AFFILIATION THADANIiA. C.
PMR Prospect Directov'ate 8
SUBJECT:
Requests appv oval for new large break LOCA analgsisiredone bg C-Ei to cov v'ect nonconservatism, in lav ge bv eak LOCA evaluation model 5 to add steam genev'atov tube plugging up to 1i 250 average length tubes pev steam generator.
Fee paid.
DISTRIBUTION CODE N008D COPIES RECEIVED: LTR ENCL SIZE:
TITLE: License Fees NOTES:
DOCKET 0 05000389 RECIPIENT ID CODE/NAME PMR-B PD8 PD 04 INTERNAL: ADN/LFNB 06 COPIES LTTR ENCL RECIPIENT ID CODE/NAME SELLS' 01 COPIES LTTR ENCL EXTERNAL: 24X NRC PDR LPDR 03 TOTAL NUMBER OF COPIES REQUIRED:
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FLORIDAPOWER 5 LIGHTCOMPANY L-86-8 I Office of Nuclear Reactor Regulation Attention:
Mr. Ashok C. Thadani, Director PWR Project Directorate
$18 Division of PWR Licensing - B U. S. Nuclear Regulatory Commission Washington, D. C. 20555
Dear Mr. Thadani:
Re:
St. Lucie Unit No. 2 Docket No. 50-389 C-E Lar e Break LOCA Anal sis Florida Power and Light Company letter L-86-37, dated January 3I, l 986, provided the results of the St. Lucie Unit 2 Large Break LOCA Analysis, which was redone by Combustion Engineering (C-E) to correct a non-conservatism in C-E's Large Break LOCA evaluation model.
As stated in our January 3I, l986 letter, the results demonstrate compliance with IO CFR 50.46 criteria.
It should be noted that not only did the new analysis correct the non-conservatism, the new analysis also assumed additional steam generator tube plugging, up to l250 average length tubes per steam generator.
This represents a total tube plugging of approximately l5% compared to about 4% in the previous analysis.
The purpose of this letter is to request NRC approval of the new analysis.
Although we do not expect to find any problems with the Unit 2 steam generators during the upcoming refueling outage, we are requesting your approval by April I, l 986, in order to have the additional tube plugging margin.
For your information, the previous analysis assumed a limit of 300 tubes plugged per steam generator.
As of April l985, l78 tubes have been plugged in the "A" generator and l33 tubes have been plugged in the "B" generator.
In accordance with IO CFR l70.I2, attached is FPL Check No. 0507 for the required application fee.
Very truly yours,
. Woo Group Vi resident Nuclear Energy CO W/RJS/gp 86OS<SaaeS Ssooos89 Pgg IIIIQOCK 05 P
RJS4/02 I/ I ooC
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