ML17209A387

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Responds to NRC 801017 Request for Addl Info Re 800611 Natural Circulation Cooldown Event.Util Is Developing Cooldown Method Capable of Achieving Cold Shutdown W/O Upper Head Voiding.Results Will Be Submitted by 801230
ML17209A387
Person / Time
Site: Saint Lucie NextEra Energy icon.png
Issue date: 11/20/1980
From: Robert E. Uhrig
FLORIDA POWER & LIGHT CO.
To: Clark R
Office of Nuclear Reactor Regulation
References
L-80-385, NUDOCS 8012010106
Download: ML17209A387 (4)


Text

REGUL'ATORY ORMATION DISTRIBUT'IOV~ SY,'(l, (RIDS).

ACCESSION" NBR:8012010106 DOC',DATE: 80/11/20 VOTARIZED:NO DOCKET':

FACIL:50 335 St., Ltucie- Pl a'nti Unit }i Filorida'ower. 8 L(ight Cot. 05000335(

AUTH ~ NAMEl AUTHOR AFFiiLKATION UHRIGr R ~ E ~, Filo> i de Poper- 8 L'ight Co, RECIP ~ NAME RECiIP1IEiViT( AFFILiIATION CL'ARK~RE A, -

Ooerating Reactors Bra'nch 3

SUBJECT:

Responds to< NRCl 80101.7 r equest for addi'nfo, r e 800611 natur'al circulation cooldown event ~ Util's developing coo~l down method ca'pabl e of achi eving col d( shutdown w/ol upper head voiding. Results will be submitted by 801230 ~ .

DISTRIBUTION G'ener al CODE,': AOOIS COPIES RECEIYED:LIER Distribution( for,'-'f ter Issuance of Operating License 2 < ENCLI 2 SIZE" t.'ITLE:

NOTES'ECIPIENT: COPIES COP1IES RECIP IENYt ID CODE'/iVAMEl LITTR ENCL'"'3 ID CODE'/N AiYIEi LTTTR* ENCLl ACTION! CL'ARK',, 04 13 INTERNAL(: D/DIR'UM" 1. IE El 06 2 2 OR PDR ASSESS F'AC08'VRC.

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==@4 LIGHT COMPANY November 20, 1980 L-80-385 t 't Qi) ~t Q~W~

~~ca Office of Nuclear Reactor Regulation Attention: Mr. Robert A. Clark, Chief ~CO ~ gL Operating Reactors Branch ¹3 Rl Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Dear Mr. Clark:

Re: St. Lucie Unit ¹1 Docket No. 50-335 Natural Circulation Cooldown Your October 17, 1980 letter requested additional information regarding the June ll, 1980 St. Lucie Unit 1 Natural Circulation Cooldown Event. The additional information requested centered around the issue of determining a cooldown rate capable of achieving cold shutdown without upper head voiding.

In previous correspondence we have provided analyses which demonstrate that the "drain and fill" method of operation is a safe method of achieving cold shutdown, and is a method we have successfully used on two occasions. Our Nuclear Analysis Department,'owever, is currently working towards developing a cooldown method capable of achievi ng cold shutdown without upper head voiding. We expect to have the results of this effort by December 30, 1980 .

and will transmit it to you at that time.

Very truly yours, ert E. Uhrig Vice President Advanced Systems 5 Technology REU/JEM/pah cc: J. P. O'Reilly, Region II Harold F. Reis, Esquire aII>SO~>>O b

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